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2. Review of Survey activities 2013: Mass loss from an ice-sheet drainage basin in West Greenland

Author

Andersen, M.L., Andersen, S.B., Stenseng, L., Skourup, H., Colgan, W., Kristensen, S.S., Boncori, J.P.M., Ahlstrøm, A.P., Fettweis, X., Forsberg, R., Citterio, M., Box, J.E., van As, D., and Fausto, R.S.

Subjects
Geological Survey of Denmark and Greenland, survey organisations, current research, Denmark, Geology, QE1-996.5, Geophysics. Cosmic physics, QC801-809
Published
2014

5. The historical Greenland Climate Network (GC-Net) curated and augmented level-1 dataset

Author

Vandecrux, B., Box, J.E., Ahlstrøm, A.P., Andersen, S.B., Bayou, N., Colgan, W.T., Cullen, N.J., Fausto, R.S., Haas-Artho, D., Heilig, A., Houtz, D.A., How, P., Enescu, I.I., Karlsson, N.B., Buchholz, R.K., Mankoff, K.D., McGrath, D., Molotch, N.P., Perren, B., Revheim, M.K., Rutishauser, A., Sampson, K., Schneebeli, M., Starkweather, S., Steffen, S., Weber, J., Wright, P.J., Zwally, H.J., Steffen, K., Vandecrux, B., Box, J.E., Ahlstrøm, A.P., Andersen, S.B., Bayou, N., Colgan, W.T., Cullen, N.J., Fausto, R.S., Haas-Artho, D., Heilig, A., Houtz, D.A., How, P., Enescu, I.I., Karlsson, N.B., Buchholz, R.K., Mankoff, K.D., McGrath, D., Molotch, N.P., Perren, B., Revheim, M.K., Rutishauser, A., Sampson, K., Schneebeli, M., Starkweather, S., Steffen, S., Weber, J., Wright, P.J., Zwally, H.J., and Steffen, K.

Abstract

The Greenland Climate Network (GC-Net) consists of 31 automatic weather stations (AWSs) at 30 sites across the Greenland Ice Sheet. The first site was initiated in 1990, and the project has operated almost continuously since 1995 under the leadership of the late Konrad Steffen. The GC-Net AWS measured air temperature, relative humidity, wind speed, atmospheric pressure, downward and reflected shortwave irradiance, net radiation, and ice and firn temperatures. The majority of the GC-Net sites were located in the ice sheet accumulation area (17 AWSs), while 11 AWSs were located in the ablation area, and two sites (three AWSs) were located close to the equilibrium line altitude. Additionally, three AWSs of similar design to the GC-Net AWS were installed by Konrad Steffen's team on the Larsen C ice shelf, Antarctica. After more than 3 decades of operation, the GC-Net AWSs are being decommissioned and replaced by new AWSs operated by the Geological Survey of Denmark and Greenland (GEUS). Therefore, making a reassessment of the historical GC-Net AWS data is necessary. We present a full reprocessing of the historical GC-Net AWS dataset with increased attention to the filtering of erroneous measurements, data correction and derivation of additional variables: continuous surface height, instrument heights, surface albedo, turbulent heat fluxes, and 10 m ice and firn temperatures. This new augmented GC-Net level-1 (L1) AWS dataset is now available at https://doi.org/10.22008/FK2/VVXGUT (Steffen et al., 2023) and will continue to be refined. The processing scripts, latest data and a data user forum are available at https://github.com/GEUS-Glaciology-and-Climate/GC-Net-level-1-data-processing (last access: 30 November 2023). In addition to the AWS data, a comprehensive compilation of valuable metadata is provided: maintenance reports, yearly pictures of the stations and the station positions through time. This unique dataset provides more than 320 station years of high-quality

Published
2023

7. Field-scale parameters

Author

Radcliffe, D.E., Tillotson, P.M., Hendrix, P.F., West, L.T., Box, J.E., and Tollner, E.W.

Subjects
Soil mechanics -- Research, Sediment transport -- Research, Earth sciences
Abstract

Tile drains have been suggested as a method of measuring field-scale transport parameters, but lateral flow to the drains in the saturated zone can introduce error in the measurement of unsaturated zone parameters. Our objective was to use a two-layer transfer function model to determine field-scale unsaturated zone transport parameters from tile drain breakthrough curves measured in two 12.5 by 30.5 m plots. Plots were irrigated to steady-state tile drain flow, Cl was added as a tracer, and irrigation was continued for up to 600 h. The first layer of the transfer function model consisted of the unsaturated zone and was described by the convection-dispersion equation (CDE) probability density function (pdf). The second layer consisted of the saturated zone and was described by the gamma distribution pdf. The CDE parameters were determined from a fit of the two layer model to the drainage pdf in each tile drain. Transport parameters were similar for the two plots. Mean field-scale dispersivity ([Lambda]) for the unsaturated zone (0-20 cm) was 5.3 cm for Plot 1 and 3.4 cm for Plot 2. This was much less than [Lambda] calculated for the overall system by moment analysis ([Lambda] = 23.7 and 19.5 cm in Plot 1 and 2, respectively) suggesting that most of the dispersion of the tile drain breakthrough curves was due to lateral flow in the saturated zone. This illustrates that tile drain breakthrough curves can be used to determine field-scale unsaturated zone transport parameters provided a model is used that accounts for two-dimensional flow in the saturated zone.

Published
1996

8. State of the climate in 2018

Author

Ades, M., Adler, R., Aldeco, L.S., Alejandra, G., Alfaro, E.J., Aliaga-Nestares, V., Allan, R.P., Allan, R., Alves, L.M., Amador, J.A., Andersen, J.K., Anderson, J., Arndt, D.S., Arosio, C., Arrigo, K., Azorin-Molina, C., Bardin, M.Y., Barichivich, J., Barreira, S., Baxter, S., Beck, H.E., Becker, A., Bell, G.D., Bellouin, N., Belmont, M., Benedetti, A., Benedict, I., Bernhard, G.H., Berrisford, P., Berry, D.I., Bettio, L., Bhatt, U.S., Biskaborn, B.K., Bissolli, P., Bjella, K.L., Bjerke, J.K., Blake, E.S., Blenkinsop, S., Blunden, J., Bock, O., Bosilovich, M.G., Boucher, O., Box, J.E., Boyer, T., Braathen, G., Bringas, F.G., Bromwich, D.H., Brown, A., Brown, R., Brown, T.J., Buehler, S.A., Cáceres, L., Calderón, B., Camargo, S.J., Campbell, J.D., Campos Diaz, D.A., Cappelen, J., Carrea, L., Carrier, S.B., Carter, B.R., Castro, A.Y., Cetinic, I., Chambers, D.P., Chen, L., Cheng, L., Cheng, V.Y.S., Christiansen, H.H., Christy, J.R., Chung, E.-S., Claus, F., Clem, K.R., Coelho, C.A.S., Coldewey-Egbers, M., Colwell, S., Cooper, O.R., Cosca, C., Covey, C., Coy, L., Dávila, C.P., Davis, S.M., de Eyto, E., de Jeu, R.A.M., De Laat, J., Decharme, B., Degasperi, C.L., Degenstein, D., Demircan, M., Derksen, C., Dhurmea, K.R., Di Girolamo, L., Diamond, H.J., Diaz, E., Diniz, F.A., Dlugokencky, E.J., Dohan, K., Dokulil, M.T., Dolman, A.J., Domingues, C.M., Domingues, R., Donat, M.G., Dorigo, W.A., Drozdov, D.S., Druckenmiller, M.L., Dunn, R.J.H., Durre, I., Dutton, G.S., Elkharrim, M., Elkins, J.W., Epstein, H.E., Espinoza, J.C., Famiglietti, J.S., Farrell, S.L., Fausto, R.S., Feely, R.A., Feng, Z., Fenimore, C., Fettweis, X., Fioletov, V.E., Flemming, J., Fogt, R.L., Forbes, B.C., Foster, M.J., Francis, S.D., Franz, B.A., Frey, R.A., Frith, S.M., Froidevaux, L., Ganter, C., Garforth, J., Gerland, S., Gilson, J., Gleason, K., Gobron, N., Goetz, S., Goldenberg, S.B., Goni, G., Gray, A., Groo, J.-U., Gruber, A., Gu, G., Guard, C.C.P., Gupta, S.K., Gutiérrez, D., Haas, Christian, Hagos, S., Hahn, S., Haimberger, L., Hall, B.D., Halpert, M.S., Hamlington, B.D., Hanna, E., Hanssen-Bauer, I., Harris, I., Hazeleger, W., He, Q., Heidinger, A.K., Heim, Jr., Hemming, D.L., Hendricks, Stefan, Hernández, R., Hersbach, H.E., Hidalgo, H.G., Ho, S.-P.B., Holmes, R.M., Hu, C., Huang, B., Hubbard, K., Hubert, D., Hurst, D.F., Ialongo, I., Ijampy, J.A., Inness, A., Isaac, V., Isaksen, K., Ishii, M., Jeffries, M.O., Jevrejeva, S., Jia, G., Jiménez, C., Jin, X., John, V., Johnsen, B., Johnson, G.C., Johnson, K.S., Johnson, B., Jones, P.D., Jumaux, G., Kabidi, K., Kaiser, J.W., Karaköylü, E.M., Karlsen, S.-R., Karnauskas, M., Kato, S., Kazemi, A.F., Kelble, C., Keller, L.M., Kennedy, J., Kholodov, A.L., Khoshkam, M., Kidd, R., Killick, R., Kim, H., Kim, S.-J., King, A.D., King, B.A., Kipling, Z., Klotzbach, P.J., Knaff, J.A., Korhonen, J., Korshunova, N.N., Kramarova, N.A., Kratz, D.P., Kruger, A., Kruk, M.C., Krumpen, Thomas, Labbé, L., Ladd, C., Lakatos, M., Lakkala, K., Lander, M.A., Landschützer, P., Landsea, C.W., Lareau, N.P., Lavado-Casimiro, W., Lazzara, M.A., Lee, T.C., Leuliette, E., L�heureux, M., Li, B., Li, T., Lieser, J.L., Lim, J.-Y., Lin, I.-I., Liu, H., Locarnini, R., Loeb, N.G., Long, C.S., López, L.A., Lorrey, A.M., Loyola, D., Lumpkin, R., Luo, J.-J., Luojus, K., Lyman, J.M., Malkova, G.V., Manney, G.L., Marchenko, S.S., Marengo, J.A., Marin, D., Marquardt Collow, A.B., Marra, J.J., Marszelewski, W., Martens, B., Martínez-Güingla, R., Massom, R.A., May, L., Mayer, M., Mazloff, M., McBride, C., McCabe, M., McClelland, J.W., McEvoy, D.J., McGree, S., McVicar, T.R., Mears, C.A., Meier, W., Meijers, A., Mekonnen, A., Mengistu Tsidu, G., Menzel, W.P., Merchant, C.J., Meredith, M.P., Merrifield, M.A., Miller, B., Miralles, D.G., Misevicius, N., Mitchum, G.T., Mochizuki, Y., Monselesan, D., Montzka, S.A., Mora, N., Morice, C., Mosquera-Vásquez, K., Mostafa, A.E., Mote, T., Mudryk, L., Mühle, J., Mullan, A.B., Müller, R., Myneni, R., Nash, E.R., Nauslar, N.J., Nerem, R.S., Newman, P.A., Nicolas, J.P., Nieto, J.J., Noetzli, J., Osborn, T.J., Osborne, E., Overland, J., Oyunjargal, L., Park, T., Pasch, R.J., Pascual Ramírez, R., Pastor Saavedra, M.A., Paterson, A.M., Pearce, P.R., Pelto, M.S., Perovich, D., Petropavlovskikh, I., Pezza, A.B., Phillips, C., Phillips, D., Phoenix, G., Pinty, B., Pitts, M., Po-Chedley, S., Polashenski, C., Preimesberger, W., Purkey, S.G., Quispe, N., Rajeevan, M., Rakotoarimalala, C.L., Ramos, A.M., Ramos, I., Randel, W., Raynolds, M.K., Reagan, J., Reid, P., Reimer, C., Rémy, S., Revadekar, J.V., Richardson, A.D., Richter-Menge, J., Ricker, Robert, Ripaldi, A., Robinson, D.A., Rodell, M., Rodriguez Camino, E., Romanovsky, V.E., Ronchail, J., Rosenlof, K.H., Rösner, B., Roth, C., Rozanov, A., Rusak, J.A., Rustemeier, E., Rutishäuser, T., Sallée, J.-B., Sánchez-Lugo, A., Santee, M.L., Sawaengphokhai, P., Sayouri, A., Scambos, T.A., Scanlon, T., Scardilli, A.S., Schenzinger, V., Schladow, S.G., Schmid, C., Schmid, M., Schoeneich, P., Schreck, III, Selkirk, H.B., Sensoy, S., Shi, L., Shiklomanov, A.I., Shiklomanov, N.I., Shimpo, A., Shuman, C.A., Siegel, D.A., Sima, F., Simmons, A.J., Smeets, C.J.P.P., Smith, A., Smith, S.L., Soden, B., Sofieva, V., Sparks, T.H., Spence, J., Spencer, R.G.M., Spillane, S., Srivastava, A.K., Stabeno, P.J., Stackhouse, Jr., Stammerjohn, S., Stanitski, D.M., Steinbrecht, W., Stella, J.L., Stengel, M., Stephenson, T.S., Strahan, S.E., Streeter, C., Streletskiy, D.A., Sun-Mack, S., Suslova, A., Sutton, A.J., Swart, S., Sweet, W., Takahashi, K.S., Tank, S.E., Taylor, M.A., Tedesco, M., Thackeray, S.J., Thompson, P.R., Timbal, B., Timmermans, M.-L., Tobin, S., Tømmervik, H., Tourpali, K., Trachte, K., Tretiakov, M., Trewin, B.C., Triñanes, J.A., Trotman, A.R., Tschudi, M., Tye, M.R., van As, D., van de Wal, R.S.W., van der A, R.J., van der Schalie, R., van der Schrier, G., van der Werf, G.R., van Heerwaarden, C., Van Meerbeeck, C.J., Verburg, P., Vieira, G., Vincent, L.A., Vömel, H., Vose, R.S., Walker, D.A., Walsh, J.E., Wang, B., Wang, H., Wang, L., Wang, M., Wang, R., Wang, S.-H., Wanninkhof, R., Watanabe, S., Weber, M., Webster, M., Weerts, A., Weller, R.A., Westberry, T.K., Weyhenmeyer, G.A., Widlansky, M.J., Wijffels, S.E., Wilber, A.C., Wild, J.D., Willett, K.M., Wong, T., Wood, E.F., Woolway, R.I., Xue, Y., Yin, X., Yu, L., Zambrano, E., Zeyaeyan, S., Zhang, H.-M., Zhang, P., Zhao, G., Zhao, L., Zhou, X., Zhu, Z., Ziemke, J.R., Ziese, M., Andersen, A., Griffin, J., Hammer, G., Love-Brotak, S.E., Misch, D.J., Riddle, D.B., Veasey, S.W., Ades, M., Adler, R., Aldeco, L.S., Alejandra, G., Alfaro, E.J., Aliaga-Nestares, V., Allan, R.P., Allan, R., Alves, L.M., Amador, J.A., Andersen, J.K., Anderson, J., Arndt, D.S., Arosio, C., Arrigo, K., Azorin-Molina, C., Bardin, M.Y., Barichivich, J., Barreira, S., Baxter, S., Beck, H.E., Becker, A., Bell, G.D., Bellouin, N., Belmont, M., Benedetti, A., Benedict, I., Bernhard, G.H., Berrisford, P., Berry, D.I., Bettio, L., Bhatt, U.S., Biskaborn, B.K., Bissolli, P., Bjella, K.L., Bjerke, J.K., Blake, E.S., Blenkinsop, S., Blunden, J., Bock, O., Bosilovich, M.G., Boucher, O., Box, J.E., Boyer, T., Braathen, G., Bringas, F.G., Bromwich, D.H., Brown, A., Brown, R., Brown, T.J., Buehler, S.A., Cáceres, L., Calderón, B., Camargo, S.J., Campbell, J.D., Campos Diaz, D.A., Cappelen, J., Carrea, L., Carrier, S.B., Carter, B.R., Castro, A.Y., Cetinic, I., Chambers, D.P., Chen, L., Cheng, L., Cheng, V.Y.S., Christiansen, H.H., Christy, J.R., Chung, E.-S., Claus, F., Clem, K.R., Coelho, C.A.S., Coldewey-Egbers, M., Colwell, S., Cooper, O.R., Cosca, C., Covey, C., Coy, L., Dávila, C.P., Davis, S.M., de Eyto, E., de Jeu, R.A.M., De Laat, J., Decharme, B., Degasperi, C.L., Degenstein, D., Demircan, M., Derksen, C., Dhurmea, K.R., Di Girolamo, L., Diamond, H.J., Diaz, E., Diniz, F.A., Dlugokencky, E.J., Dohan, K., Dokulil, M.T., Dolman, A.J., Domingues, C.M., Domingues, R., Donat, M.G., Dorigo, W.A., Drozdov, D.S., Druckenmiller, M.L., Dunn, R.J.H., Durre, I., Dutton, G.S., Elkharrim, M., Elkins, J.W., Epstein, H.E., Espinoza, J.C., Famiglietti, J.S., Farrell, S.L., Fausto, R.S., Feely, R.A., Feng, Z., Fenimore, C., Fettweis, X., Fioletov, V.E., Flemming, J., Fogt, R.L., Forbes, B.C., Foster, M.J., Francis, S.D., Franz, B.A., Frey, R.A., Frith, S.M., Froidevaux, L., Ganter, C., Garforth, J., Gerland, S., Gilson, J., Gleason, K., Gobron, N., Goetz, S., Goldenberg, S.B., Goni, G., Gray, A., Groo, J.-U., Gruber, A., Gu, G., Guard, C.C.P., Gupta, S.K., Gutiérrez, D., Haas, Christian, Hagos, S., Hahn, S., Haimberger, L., Hall, B.D., Halpert, M.S., Hamlington, B.D., Hanna, E., Hanssen-Bauer, I., Harris, I., Hazeleger, W., He, Q., Heidinger, A.K., Heim, Jr., Hemming, D.L., Hendricks, Stefan, Hernández, R., Hersbach, H.E., Hidalgo, H.G., Ho, S.-P.B., Holmes, R.M., Hu, C., Huang, B., Hubbard, K., Hubert, D., Hurst, D.F., Ialongo, I., Ijampy, J.A., Inness, A., Isaac, V., Isaksen, K., Ishii, M., Jeffries, M.O., Jevrejeva, S., Jia, G., Jiménez, C., Jin, X., John, V., Johnsen, B., Johnson, G.C., Johnson, K.S., Johnson, B., Jones, P.D., Jumaux, G., Kabidi, K., Kaiser, J.W., Karaköylü, E.M., Karlsen, S.-R., Karnauskas, M., Kato, S., Kazemi, A.F., Kelble, C., Keller, L.M., Kennedy, J., Kholodov, A.L., Khoshkam, M., Kidd, R., Killick, R., Kim, H., Kim, S.-J., King, A.D., King, B.A., Kipling, Z., Klotzbach, P.J., Knaff, J.A., Korhonen, J., Korshunova, N.N., Kramarova, N.A., Kratz, D.P., Kruger, A., Kruk, M.C., Krumpen, Thomas, Labbé, L., Ladd, C., Lakatos, M., Lakkala, K., Lander, M.A., Landschützer, P., Landsea, C.W., Lareau, N.P., Lavado-Casimiro, W., Lazzara, M.A., Lee, T.C., Leuliette, E., L�heureux, M., Li, B., Li, T., Lieser, J.L., Lim, J.-Y., Lin, I.-I., Liu, H., Locarnini, R., Loeb, N.G., Long, C.S., López, L.A., Lorrey, A.M., Loyola, D., Lumpkin, R., Luo, J.-J., Luojus, K., Lyman, J.M., Malkova, G.V., Manney, G.L., Marchenko, S.S., Marengo, J.A., Marin, D., Marquardt Collow, A.B., Marra, J.J., Marszelewski, W., Martens, B., Martínez-Güingla, R., Massom, R.A., May, L., Mayer, M., Mazloff, M., McBride, C., McCabe, M., McClelland, J.W., McEvoy, D.J., McGree, S., McVicar, T.R., Mears, C.A., Meier, W., Meijers, A., Mekonnen, A., Mengistu Tsidu, G., Menzel, W.P., Merchant, C.J., Meredith, M.P., Merrifield, M.A., Miller, B., Miralles, D.G., Misevicius, N., Mitchum, G.T., Mochizuki, Y., Monselesan, D., Montzka, S.A., Mora, N., Morice, C., Mosquera-Vásquez, K., Mostafa, A.E., Mote, T., Mudryk, L., Mühle, J., Mullan, A.B., Müller, R., Myneni, R., Nash, E.R., Nauslar, N.J., Nerem, R.S., Newman, P.A., Nicolas, J.P., Nieto, J.J., Noetzli, J., Osborn, T.J., Osborne, E., Overland, J., Oyunjargal, L., Park, T., Pasch, R.J., Pascual Ramírez, R., Pastor Saavedra, M.A., Paterson, A.M., Pearce, P.R., Pelto, M.S., Perovich, D., Petropavlovskikh, I., Pezza, A.B., Phillips, C., Phillips, D., Phoenix, G., Pinty, B., Pitts, M., Po-Chedley, S., Polashenski, C., Preimesberger, W., Purkey, S.G., Quispe, N., Rajeevan, M., Rakotoarimalala, C.L., Ramos, A.M., Ramos, I., Randel, W., Raynolds, M.K., Reagan, J., Reid, P., Reimer, C., Rémy, S., Revadekar, J.V., Richardson, A.D., Richter-Menge, J., Ricker, Robert, Ripaldi, A., Robinson, D.A., Rodell, M., Rodriguez Camino, E., Romanovsky, V.E., Ronchail, J., Rosenlof, K.H., Rösner, B., Roth, C., Rozanov, A., Rusak, J.A., Rustemeier, E., Rutishäuser, T., Sallée, J.-B., Sánchez-Lugo, A., Santee, M.L., Sawaengphokhai, P., Sayouri, A., Scambos, T.A., Scanlon, T., Scardilli, A.S., Schenzinger, V., Schladow, S.G., Schmid, C., Schmid, M., Schoeneich, P., Schreck, III, Selkirk, H.B., Sensoy, S., Shi, L., Shiklomanov, A.I., Shiklomanov, N.I., Shimpo, A., Shuman, C.A., Siegel, D.A., Sima, F., Simmons, A.J., Smeets, C.J.P.P., Smith, A., Smith, S.L., Soden, B., Sofieva, V., Sparks, T.H., Spence, J., Spencer, R.G.M., Spillane, S., Srivastava, A.K., Stabeno, P.J., Stackhouse, Jr., Stammerjohn, S., Stanitski, D.M., Steinbrecht, W., Stella, J.L., Stengel, M., Stephenson, T.S., Strahan, S.E., Streeter, C., Streletskiy, D.A., Sun-Mack, S., Suslova, A., Sutton, A.J., Swart, S., Sweet, W., Takahashi, K.S., Tank, S.E., Taylor, M.A., Tedesco, M., Thackeray, S.J., Thompson, P.R., Timbal, B., Timmermans, M.-L., Tobin, S., Tømmervik, H., Tourpali, K., Trachte, K., Tretiakov, M., Trewin, B.C., Triñanes, J.A., Trotman, A.R., Tschudi, M., Tye, M.R., van As, D., van de Wal, R.S.W., van der A, R.J., van der Schalie, R., van der Schrier, G., van der Werf, G.R., van Heerwaarden, C., Van Meerbeeck, C.J., Verburg, P., Vieira, G., Vincent, L.A., Vömel, H., Vose, R.S., Walker, D.A., Walsh, J.E., Wang, B., Wang, H., Wang, L., Wang, M., Wang, R., Wang, S.-H., Wanninkhof, R., Watanabe, S., Weber, M., Webster, M., Weerts, A., Weller, R.A., Westberry, T.K., Weyhenmeyer, G.A., Widlansky, M.J., Wijffels, S.E., Wilber, A.C., Wild, J.D., Willett, K.M., Wong, T., Wood, E.F., Woolway, R.I., Xue, Y., Yin, X., Yu, L., Zambrano, E., Zeyaeyan, S., Zhang, H.-M., Zhang, P., Zhao, G., Zhao, L., Zhou, X., Zhu, Z., Ziemke, J.R., Ziese, M., Andersen, A., Griffin, J., Hammer, G., Love-Brotak, S.E., Misch, D.J., Riddle, D.B., and Veasey, S.W.

Published
2019

9. Surface meltwater impounded by seasonal englacial storage in West Greenland

Author

Kendrick, A.K., Schroeder, D.M., Chu, W., Young, Tun Jan, Christofferson, P., Todd, J., Doyle, S.H., Box, J.E., Hubbard, A., Hubbard, B., Brennan, P.V., Nicholls, Keith W., Lok, L.B., Kendrick, A.K., Schroeder, D.M., Chu, W., Young, Tun Jan, Christofferson, P., Todd, J., Doyle, S.H., Box, J.E., Hubbard, A., Hubbard, B., Brennan, P.V., Nicholls, Keith W., and Lok, L.B.

Abstract

The delivery of surface meltwater through englacial drainage systems to the bed of the Greenland Ice Sheet modulates ice flow through basal lubrication. Recent studies in Southeast Greenland have identified a perennial firn aquifer; however, there are few observations quantifying the input or residence time of water within the englacial system and it remains unknown whether water can be stored within solid ice. Using hourly stationary radar measurements, we present observations of englacial and episodic subglacial water in the ablation zone of Store Glacier in West Greenland. We find significant storage of meltwater in solid ice damaged by crevasses extending down to 48 m below the ice surface during the summer which is released or refrozen during winter. This is a significant hydrological component newly observed in the ablation zone of Greenland that could delay the delivery of meltwater to the bed, changing the ice dynamic response to surface meltwater.

Published
2018

10. Physical Conditions of Fast Glacier Flow: 1. Measurements From Boreholes Drilled to the Bed of Store Glacier, West Greenland

Author

Doyle, S.H., Hubbard, B., Christoffersen, P., Young, T.J., Hofstede, C., Bougamont, M., Box, J.E., Hubbard, A., Doyle, S.H., Hubbard, B., Christoffersen, P., Young, T.J., Hofstede, C., Bougamont, M., Box, J.E., and Hubbard, A.

Abstract

Marine‐terminating outlet glaciers of the Greenland Ice Sheet make significant contributions to global sea level rise, yet the conditions that facilitate their fast flow remain poorly constrained owing to a paucity of data. We drilled and instrumented seven boreholes on Store Glacier, Greenland, to monitor subglacial water pressure, temperature, electrical conductivity, and turbidity along with englacial ice temperature and deformation. These observations were supplemented by surface velocity and meteorological measurements to gain insight into the conditions and mechanisms of fast glacier flow. Located 30 km from the calving front, each borehole drained rapidly on attaining ∼600 m depth indicating a direct connection with an active subglacial hydrological system. Persistently high subglacial water pressures indicate low effective pressure (180–280 kPa), with small‐amplitude variations correlated with notable peaks in surface velocity driven by the diurnal melt cycle and longer periods of melt and rainfall. The englacial deformation profile determined from borehole tilt measurements indicates that 63–71% of total ice motion occurred at the bed, with the remaining 29–37% predominantly attributed to enhanced deformation in the lowermost 50–100 m of the ice column. We interpret this lowermost 100 m to be formed of warmer, pre‐Holocene ice overlying a thin (0–8 m) layer of temperate basal ice. Our observations are consistent with a spatially extensive and persistently inefficient subglacial drainage system that we hypothesize comprises drainage both at the ice‐sediment interface and through subglacial sediments. This configuration has similarities to that interpreted beneath dynamically analogous Antarctic ice streams, Alaskan tidewater glaciers, and glaciers in surge.

Published
2018

11. State of Climate in 2012

Author

Blunden, J., Arndt, D.S., Achberger, C., Ackerman, S.A., Albanil, A., Alexander, P., Alfaro, E.J., Allan, R., Alves, L.M., Amador, J.A., Ambenje, P., Andrianjafinirina, S., Antonov, J., Aravequia, J.A., Arendt, A., Arevalo, J., Ashik, I., Altheru, Z., Banzon, V., Baringer, M.O., Barreira, S., Barriopedro, D.E., Beard, G., Becker, G., Behrenfeld, M.J., Bell, G.D., Benedetti, A., Bernhard, G., Berrisford, P., Berry, D.I., Bhatt, U., Bidegain, M., Bindoff, N., Bissolli, P., Blake, E.S., Booneeady, R., Bosilovich, M., Box, J.E., Boyer, T., Braathen, G.O., Bromwich, D.H., Brown, R., Brown, L., Bruhwiler, L., Bulygina, O.N., Burgess, D., Burrows, J., Calderon, B., Camargo, S.J., Campbell, J., Cao, Y., Cappelen, J., Carrasco, G., Chambers, D.P., Chang'a, L., Chappell, P., Chehade, W., Cheliah, M., Christiansen, H.H., Christy, J.R., Ciais, P., Coelho, C.A.S., Cogley, J.G., Colwell, S., Cross, J.N., Crouch, J., Cunningham, S.A., Dacic, M., de Jeu, R.A.M., Dekaa, F.S., Demircan, M., Derksen, C., Diamond, H.J., Dlugokencky, E.J., Dohan, K., Dolman, A.J., Spatial analysis & Decision Support, Earth and Climate, and Amsterdam Global Change Institute

Subjects
SDG 13 - Climate Action, SDG 14 - Life Below Water
Abstract

For the first time in several years, the El Nino-Southern Oscillation did not dominate regional climate conditions around the globe. A weak La Niña dissipated to ENSO-neutral conditions by spring, and while El Nino appeared to be emerging during summer, this phase never fully developed as sea surface temperatures in the eastern equatorial Pacific uncharacteristically returned to neutral conditions. Nevertheless, other large-scale climate patterns and extreme weather events impacted various regions during the year. A negative phase of the Arctic Oscillation from mid-January to early February contributed to frigid conditions in parts of northern Africa, eastern Europe, and western Asia. A lack of rain during the 2012 wet season led to the worst drought in at least the past three decades for northeastern Brazil. Central North America also experienced one of its most severe droughts on record. The Caribbean observed a very wet dry season and it was the Sahel's wettest rainy season in 50 years. Overall, the 2012 average temperature across global land and ocean surfaces ranked among the 10 warmest years on record. The global land surface temperature alone was also among the 10 warmest on record. In the upper atmosphere, the average stratospheric temperature was record or near-record cold, depending on the dataset. After a 30-year warming trend from 1970 to 1999 for global sea surface temperatures, the period 2000-12 had little further trend. This may be linked to the prevalence of La Niña-like conditions during the 21st century. Heat content in the upper 700 m of the ocean remained near record high levels in 2012. Net increases from 2011 to 2012 were observed at 700-m to 2000-m depth and even in the abyssal ocean below. Following sharp decreases in global sea level in the first half of 2011 that were linked to the effects of La Niña, sea levels rebounded to reach records highs in 2012. The increased hydrological cycle seen in recent years continued, with more evaporation in drier locations and more precipitation in rainy areas. In a pattern that has held since 2004, salty areas of the ocean surfaces and subsurfaces were anomalously salty on average, while fresher areas were anomalously fresh. Global tropical cyclone activity during 2012 was near average, with a total of 84 storms compared with the 1981-2010 average of 89. Similar to 2010 and 2011, the North Atlantic was the only hurricane basin that experienced above-normal activity. In this basin, Sandy brought devastation to Cuba and parts of the eastern North American seaboard. All other basins experienced either near- or below-normal tropical cyclone activity. Only three tropical cyclones reached Category 5 intensity-all in the Western North Pacific basin. Of these, Super Typhoon Bopha became the only storm in the historical record to produce winds greater than 130 kt south of 7°N. It was also the costliest storm to affect the Philippines and killed more than 1000 residents. Minimum Arctic sea ice extent in September and Northern Hemisphere snow cover extent in June both reached new record lows. June snow cover extent is now declining at a faster rate (-17.6% per decade) than September sea ice extent (-13.0% per decade). Permafrost temperatures reached record high values in northernmost Alaska. A new melt extent record occurred on 11-12 July on the Greenland ice sheet; 97% of the ice sheet showed some form of melt, four times greater than the average melt for this time of year. The climate in Antarctica was relatively stable overall. The largest maximum sea ice extent since records begain in 1978 was observed in September 2012. In the stratosphere, warm air led to the second smallest ozone hole in the past two decades. Even so, the springtime ozone layer above Antarctica likely will not return to its early 1980s state until about 2060. Following a slight decline associated with the global financial crisis, global CO

Published
2014
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12. State of the climate in 2015

Author

Aaron-Morrison, A.P., Ackerman, S.A., Adams, N.G., Adler, R.F., Albanil, A., Alfaro, E.J., Allan, R., Alves, L.M., Amador, J.A., Andreassen, L.M., Arendt, A., Arévalo, J., Arndt, D.S., Arzhanova, N.M., Aschan, M.M., Azorin-Molina, C., Banzon, V., Bardin, M.U., Barichivich, J., Baringer, M.O., Barreira, S., Baxter, S., Bazo, J., Becker, A., Bedka, K.M., Behrenfeld, M.J., Bell, G.D., Belmont, M., Benedetti, A., Bernhard, G., Berrisford, P., Berry, D.I., Bettolli, M.L., Bhatt, U.S., Bidegain, M., Bill, B.D., Billheimer, S., Bissolli, P., Blake, E.S., Blunden, J., Bosilovich, M.G., Boucher, O., Boudet, D., Box, J.E., Boyer, T., Braathen, G.O., Bromwich, D.H., Brown, R., Bulygina, O.N., Burgess, D., Calderón, B., Camargo, S.J., Campbell, J.D., Cappelen, J., Carrasco, G., Carter, B.R., Chambers, D.P., Chandler, E., Christiansen, H.H., Christy, J.R., Chung, D., Chung, E.-S., Cinque, K., Clem, K.R., Coelho, C.A., Cogley, J.G., Coldewey-Egbers, M., Colwell, S., Cooper, O.R., Copland, L., Cosca, C.E., Cross, J.N., Crotwell, M.J., Crouch, J., Davis, S.M., De Eyto, E., De Jeu, R.A.M., De Laat, J., Degasperi, C.L., Degenstein, D., Demircan, M., Derksen, C., Destin, D., Di Girolamo, L., Di Giuseppe, F., Diamond, H.J., Dlugokencky, E.J., Dohan, K., Dokulil, M.T., Dolgov, A.V., Dolman, A.J., Domingues, C.M., Donat, M.G., Dong, S., Dorigo, W.A., Dortch, Q., Doucette, G., Drozdov, D.S., Ducklow, H., Dunn, R.J.H., Durán-Quesada, A.M., Dutton, G.S., Ebrahim, A., Elkharrim, M., Elkins, J.W., Espinoza, J.C., Etienne-Leblanc, S., Evans, T.E., Famiglietti, J.S., Farrell, S., Fateh, S., Fausto, R.S., Fedaeff, N., Feely, R.A., Feng, Z., Fenimore, C., Fettweis, X., Fioletov, V.E., Flemming, J., Fogarty, C.T., Fogt, R.L., Folland, C., Fonseca, C., Fossheim, M., Foster, M.J., Fountain, A., Francis, S.D., Franz, B.A., Frey, R.A., Frith, S.M., Froidevaux, L., Ganter, C., Garzoli, S., Gerland, S., Gobron, N., Goldenberg, S.B., Gomez, R.S., Goni, G., Goto, A., Grooß, J.-U., Gruber, A., Guard, C.C., Gugliemin, M., Gupta, Somil, Gutiérrez, J.M., Hagos, S., Hahn, S., Haimberger, L., Hakkarainen, J., Hall, B.D., Halpert, M.S., Hamlington, B.D., Hanna, E., Hansen, K., Hanssen-Bauer, I., Harris, I., Heidinger, A.K., Heikkilä, A., Heil, A., Heim, R.R., Hendricks, S., Hernández, M., Hidalgo, H.G., Hilburn, K., Ho, S.-P.B., Holmes, R.M., Hu, Z.-Z., Huang, B., Huelsing, H.K., Huffman, G.J., Hughes, C., Hurst, D.F., Ialongo, I., Ijampy, J.A., Ingvaldsen, R.B., Inness, A., Isaksen, K., Ishii, M., Jevrejeva, S., Jiménez, C., Jin, X., Johannesen, E., John, V., Johnsen, B., Johnson, B., Johnson, G.C., Jones, P.D., Joseph, A.C., Jumaux, G., Kabidi, K., Kaiser, J.W., Kato, S., Kazemi, A., Keller, L.M., Kendon, M., Kennedy, J., Kerr, K., Kholodov, A.L., Khoshkam, M., Killick, R., Kim, H., Kim, S.-J., Kimberlain, T.B., Klotzbach, P.J., Knaff, J.A., Kobayashi, S., Kohler, J., Korhonen, J., Korshunova, N.N., Kovacs, K.M., Kramarova, N., Kratz, D.P., Kruger, A., Kruk, M.C., Kudela, R., Kumar, A., Lakatos, M., Lakkala, K., Lander, M.A., Landsea, C.W., Lankhorst, M., Lantz, K., Lazzara, M.A., Lemons, P., Leuliette, E., L’Heureux, M., Lieser, J.L., Lin, I.-I., Liu, H., Liu, Y., Locarnini, R., Loeb, N.G., Lo Monaco, C., Long, C.S., López Álvarez, L.A., Lorrey, A.M., Loyola, D., Lumpkin, R., Luo, J.-J., Luojus, K., Lydersen, C., Lyman, J.M., Maberly, S.C., Maddux, B.C., Malheiros Ramos, A., Malkova, G.V., Manney, G., Marcellin, V., Marchenko, S.S., Marengo, J.A., Marra, J.J., Marszelewski, W., Martens, B., Martínez-Güingla, R., Massom, R.A., Mata, M.M., Mathis, J.T., May, L., Mayer, M., Mazloff, M., McBride, C., McCabe, M.F., McCarthy, M., McClelland, J.W., McGree, S., McVicar, T.R., Mears, C.A., Meier, W., Meinen, C.S., Mekonnen, A., Menéndez, M., Mengistu Tsidu, G., Menzel, W.P., Merchant, C.J., Meredith, M.P., Merrifield, M.A., Metzl, N., Minnis, P., Miralles, D.G., Mistelbauer, T., Mitchum, G.T., Monselesan, D., Monteiro, P., Montzka, S.A., Morice, C., Mote, T., Mudryk, L., Mühle, J., Mullan, A.B., Nash, E.R., Naveira-Garabato, A.C., Nerem, R.S., Newman, P.A., Nieto, J.J., Noetzli, J., O’Neel, S., Osborn, T.J., Overland, J., Oyunjargal, L., Parinussa, R.M., Park, E.-H., Parker, D., Parrington, M., Parsons, A.R., Pasch, R.J., Pascual-Ramírez, R., Paterson, A.M., Paulik, C., Pearce, P.R., Pelto, M.S., Peng, L., Perkins-Kirkpatrick, S.E., Perovich, D., Petropavlovskikh, I., Pezza, A.B., Phillips, D., Pinty, B., Pitts, M.C., Pons, M.R., Porter, A.O., Primicerio, R., Proshutinsky, A., Quegan, S., Quintana, J., Rahimzadeh, F., Rajeevan, M., Randriamarolaza, L., Razuvaev, V.N., Reagan, J., Reid, P., Reimer, C., Rémy, S., Renwick, J.A., Revadekar, J.V., Richter-Menge, J., Riffler, M., Rimmer, A., Rintoul, S., Robinson, D.A., Rodell, M., Rodríguez Solís, J.L., Romanovsky, V.E., Ronchail, J., Rosenlof, K.H., Roth, C., Rusak, J.A., Sabine, C.L., Sallée, J.-B., Sánchez-Lugo, A., Santee, M.L., Sawaengphokhai, P., Sayouri, A., Scambos, T.A., Schemm, J., Schladow, S.G., Schmid, C., Schmid, M., Schmidtko, S., Schreck, C.J., Selkirk, H.B., Send, U., Sensoy, S., Setzer, A., Sharp, M., Shaw, A., Shi, L., Shiklomanov, A.I., Shiklomanov, N.I., Siegel, D.A., Signorini, S.R., Sima, F., Simmons, A.J., Smeets, C.J.P.P., Smith, S.L., Spence, J.M., Srivastava, A.K., Stackhouse, P.W., Stammerjohn, S., Steinbrecht, W., Stella, J.L., Stengel, M., Stennett-Brown, R., Stephenson, T.S., Strahan, S., Streletskiy, D.A., Sun-Mack, S., Swart, S., Sweet, W., Talley, L.D., Tamar, G., Tank, S.E., Taylor, M.A., Tedesco, M., Teubner, K., Thoman, R.L., Thompson, P., Thomson, L., Timmermans, M.-L., Tirnanes, J.A., Tobin, S., Trachte, K., Trainer, V.L., Tretiakov, M., Trewin, B.C., Trotman, A.R., Tschudi, M., Van As, D., Van De Wal, R.S.W., van der A., R.J., Van Der Schalie, R., Van Der Schrier, G., Van Der Werf, G.R., Van Meerbeeck, C.J., Velicogna, I., Verburg, P., Vigneswaran, B., Vincent, L.A., Volkov, D., Vose, R.S., Wagner, W., Wåhlin, A., Wahr, J., Walsh, J., Wang, C., Wang, J., Wang, L., Wang, M., Wang, S.-H., Wanninkhof, R., Watanabe, S., Weber, M., Weller, R.A., Weyhenmeyer, G.A., Whitewood, R., Wijffels, S.E., Wilber, A.C., Wild, J.D., Willett, K.M., Williams, M.J.M., Willie, S., Wolken, G., Wong, T., Wood, E.F., Woolway, R.I., Wouters, B., Xue, Y., Yamada, R., Yim, S.-Y., Yin, X., Young, S.H., Yu, L., Zahid, H., Zambrano, E., Zhang, P., Zhao, G., Zhou, L., Ziemke, J.R., Love-Brotak, S.E., Gilbert, K., Maycock, T., Osborne, S., Sprain, M., Veasey, S.W., Ambrose, B.J., Griffin, J., Misch, D.J., Riddle, D.B., Young, T., Marine and Atmospheric Research, Sub Inorganic Chemistry and Catalysis, Sub Dynamics Meteorology, Sub Soft Condensed Matter, Sub Molecular Microbiology, Sub Physics of devices begr 1/1/17, LS Logica en grondslagen v.d. wiskunde, Sub SIM overig, Zonder bezoldiging NED, Sub General Pharmaceutics, Sub Algemeen Artificial Intelligence, Dynamics of Innovation Systems, Leerstoel Tubergen, Sub Chemical pharmacology, Hafd Faculteitsbureau GW, Sub IER overig, Sub Gen. Pharmacoepi and Clinical Pharm, LS Pharma, Dep IRAS, Environmental Sciences, Environmental Governance, Bureau AW, Sub Ecology and Biodiversity, Marine and Atmospheric Research, Sub Inorganic Chemistry and Catalysis, Sub Dynamics Meteorology, Sub Soft Condensed Matter, Sub Molecular Microbiology, Sub Physics of devices begr 1/1/17, LS Logica en grondslagen v.d. wiskunde, Sub SIM overig, Zonder bezoldiging NED, Sub General Pharmaceutics, Sub Algemeen Artificial Intelligence, Dynamics of Innovation Systems, Leerstoel Tubergen, Sub Chemical pharmacology, Hafd Faculteitsbureau GW, Sub IER overig, Sub Gen. Pharmacoepi and Clinical Pharm, LS Pharma, Dep IRAS, Environmental Sciences, Environmental Governance, Bureau AW, Sub Ecology and Biodiversity, Earth and Climate, Vrije Universiteit Amsterdam, Faculty of Earth and Life Sciences, and Climate Change and Landscape Dynamics

Subjects
Surface (mathematics), Atmospheric Science, 010504 meteorology & atmospheric sciences, 0208 environmental biotechnology, Mineralogy, 02 engineering and technology, 15. Life on land, 01 natural sciences, 020801 environmental engineering, 13. Climate action, F331 Atmospheric Physics, SDG 13 - Climate Action, SDG 14 - Life Below Water, Geology, 0105 earth and related environmental sciences
Abstract

SxviAUGUST 2016|ABSTRACT—J. BLUNDEN AND D. S. ARNDTIn 2015, the dominant greenhouse gases released into Earth’s atmosphere—carbon dioxide, methane, and nitrous oxide—all continued to reach new high levels. At Mauna Loa, Hawaii, the annual CO2 concentration increased by a record 3.1 ppm, exceeding 400 ppm for the first time on record. The 2015 global CO2 average neared this threshold, at 399.4 ppm. Additionally, one of the strongest El Niño events since at least 1950 developed in spring 2015 and continued to evolve through the year. The phenomenon was far reaching, impacting many regions across the globe and affecting most aspects of the climate system.Owing to the combination of El Niño and a long-term up-ward trend, Earth observed record warmth for the second con-secutive year, with the 2015 annual global surface temperature surpassing the previous record by more than 0.1°C and exceed-ing the average for the mid- to late 19th century—commonly considered representative of preindustrial conditions—by more than 1°C for the first time. Above Earth’s surface, lower troposphere temperatures were near-record high.Across land surfaces, record to near-record warmth was reported across every inhabited continent. Twelve countries, including Russia and China, reported record high annual tem-peratures. In June, one of the most severe heat waves since 1980 affected Karachi, Pakistan, claiming over 1000 lives. On 27 October, Vredendal, South Africa, reached 48.4°C, a new global high temperature record for this month. In the Arctic, the 2015 land surface temperature was 1.2°C above the 1981–2010 average, tying 2007 and 2011 for the high-est annual temperature and representing a 2.8°C increase since the record began in 1900. Increasing temperatures have led to decreasing Arctic sea ice extent and thickness. On 25 February 2015, the lowest maximum sea ice extent in the 37-year satel-lite record was observed, 7% below the 1981–2010 average. Mean sea surface temperatures across the Arctic Ocean dur-ing August in ice-free regions, representative of Arctic Ocean summer anomalies, ranged from ~0°C to 8°C above average. As a consequence of sea ice retreat and warming oceans, vast walrus herds in the Pacific Arctic are hauling out on land rather than on sea ice, raising concern about the energetics of females and young animals. Increasing temperatures in the Barents Sea are linked to a community-wide shift in fish populations: boreal communities are now farther north, and long-standing Arctic species have been almost pushed out of the area.Above average sea surface temperatures are not confined to the Arctic. Sea surface temperature for 2015 was record high at the global scale; however, the North Atlantic southeast of Greenland remained colder than average and colder than 2014. Global annual ocean heat content and mean sea level also reached new record highs. The Greenland Ice Sheet, with the capacity to contribute ~7 m to sea level rise, experienced melting over more than 50% of its surface for the first time since the record melt of 2012.Other aspects of the cryosphere were remarkable. Alpine glacier retreat continued, and preliminary data indicate that 2015 is the 36th consecutive year of negative annual mass balance. Across the Northern Hemisphere, late-spring snow cover extent continued its trend of decline, with June the sec-ond lowest in the 49-year satellite record. Below the surface, record high temperatures at 20-m depth were measured at all permafrost observatories on the North Slope of Alaska, increasing by up to 0.66°C decade–1 since 2000. In the Antarctic, surface pressure and temperatures were lower than the 1981–2010 average for most of the year, consis-tent with the primarily positive southern annular mode, which saw a record high index value of +4.92 in February. Antarctic sea ice extent and area had large intra-annual variability, with a shift from record high levels in May to record low levels in August. Springtime ozone depletion resulted in one of the largest and most persistent Antarctic ozone holes observed since the 1990s.Closer to the equator, 101 named tropical storms were observed in 2015, well above the 1981–2010 average of 82. The eastern/central Pacific had 26 named storms, the most since 1992. The western north Pacific and north and south Indian Ocean basins also saw high activity. Globally, eight tropical cyclones reached the Saffir–Simpson Category 5 intensity level.Overlaying a general increase in the hydrologic cycle, the strong El Niño enhanced precipitation variability around the world. An above-normal rainy season led to major floods in Paraguay, Bolivia, and southern Brazil. In May, the United States recorded its all-time wettest month in its 121-year national record. Denmark and Norway reported their second and third wettest year on record, respectively, but globally soil moisture was below average, terrestrial groundwater storage was the lowest in the 14-year record, and areas in “severe” drought rose from 8% in 2014 to 14% in 2015. Drought conditions prevailed across many Caribbean island nations, Colombia, Venezuela, and northeast Brazil for most of the year. Several South Pacific countries also experienced drought. Lack of rainfall across Ethiopia led to its worst drought in decades and affected millions of people, while prolonged drought in South Africa severely affected agricultural production. Indian summer monsoon rainfall was just 86% of average. Extremely dry conditions in Indonesia resulted in intense and widespread fires during August–November that produced abundant car-bonaceous aerosols, carbon monoxide, and ozone. Overall, emissions from tropical Asian biomass burning in 2015 were almost three times the 2001–14 average.

Published
2016
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13. Application of GRACE to the assessment of model-based estimates of monthly Greenland Ice Sheet mass balance (2003-2012)

Author

Schlegel, N.-J., Wiese, D.N., Larour, E.Y., Watkins, M.M., Box, J.E., Fettweis, X., and van den Broeke, M.R.

Abstract

Quantifying the Greenland Ice Sheet's future contribution to sea level rise is a challenging task that requires accurate estimates of ice sheet sensitivity to climate change. Forward ice sheet models are promising tools for estimating future ice sheet behavior, yet confidence is low because evaluation of historical simulations is challenging due to the scarcity of continental-wide data for model evaluation. Recent advancements in processing of Gravity Recovery and Climate Experiment (GRACE) data using Bayesianc-onstrained mass concentration ("mascon") functions have led to improvements in spatial resolution and noise reduction of monthly global gravity fields. Specifically, the Jet Propulsion Laboratory's JPL RL05M GRACE mascon solution (GRACE_JPL) offers an opportunity for the assessment of model-based estimates of ice sheet mass balance (MB) at similar to 300 km spatial scales. Here, we quantify the differences between Greenland monthly observed MB (GRACE_JPL) and that estimated by state-of-the-art, high-resolution models, with respect to GRACE_JPL and model uncertainties. To simulate the years 2003-2012, we force the Ice Sheet System Model (ISSM) with anomalies from three different surface mass balance (SMB) products derived from regional climate models. Resulting MB is compared against GRACE_JPL within individual mascons. Overall, we find agreement in the northeast and southwest where MB is assumed to be primarily controlled by SMB. In the interior, we find a discrepancy in trend, which we presume to be related to millennial-scale dynamic thickening not considered by our model. In the northwest, seasonal amplitudes agree, but modeled mass trends are muted relative to GRACE_JPL. Here, discrepancies are likely controlled by temporal variability in ice discharge and other related processes not represented by our model simulations, i.e., hydrological processes and ice-ocean interaction. In the southeast, GRACE_JPL exhibits larger seasonal amplitude than predicted by the models while simultaneously having more pronounced trends; thus, discrepancies are likely controlled by a combination of missing processes and errors in both the SMB products and ISSM. At the margins, we find evidence of consistent intra-annual variations in regional MB that deviate distinctively from the SMB annual cycle. Ultimately, these monthly-scale variations, likely associated with hydrology or ice-ocean interaction, contribute to steeper negative mass trends observed by GRACE_JPL. Thus, models should consider such processes at relatively high (monthly-to-seasonal) temporal resolutions to achieve accurate estimates of Greenland MB.

Published
2016

15. State of the climate in 2015

Author

Marine and Atmospheric Research, Sub Inorganic Chemistry and Catalysis, Sub Dynamics Meteorology, Sub Soft Condensed Matter, Sub Molecular Microbiology, Sub Physics of devices begr 1/1/17, LS Logica en grondslagen v.d. wiskunde, Sub SIM overig, Zonder bezoldiging NED, Sub General Pharmaceutics, Sub Algemeen Artificial Intelligence, Dynamics of Innovation Systems, Leerstoel Tubergen, Sub Chemical pharmacology, Hafd Faculteitsbureau GW, Sub ISEP overig, Sub Gen. Pharmacoepi and Clinical Pharm, LS Pharma, Dep IRAS, Environmental Sciences, Environmental Governance, Bureau AW, Sub Ecology and Biodiversity, Aaron-Morrison, A.P., Ackerman, S.A., Adams, N.G., Adler, R.F., Albanil, A., Alfaro, E.J., Allan, R., Alves, L.M., Amador, J.A., Andreassen, L.M., Arendt, A., Arévalo, J., Arndt, D.S., Arzhanova, N.M., Aschan, M.M., Azorin-Molina, C., Banzon, V., Bardin, M.U., Barichivich, J., Baringer, M.O., Barreira, S., Baxter, S., Bazo, J., Becker, A., Bedka, K.M., Behrenfeld, M.J., Bell, G.D., Belmont, M., Benedetti, A., Bernhard, G., Berrisford, P., Berry, D.I., Bettolli, M.L., Bhatt, U.S., Bidegain, M., Bill, B.D., Billheimer, S., Bissolli, P., Blake, E.S., Blunden, J., Bosilovich, M.G., Boucher, O., Boudet, D., Box, J.E., Boyer, T., Braathen, G.O., Bromwich, D.H., Brown, R., Bulygina, O.N., Burgess, D., Calderón, B., Camargo, S.J., Campbell, J.D., Cappelen, J., Carrasco, G., Carter, B.R., Chambers, D.P., Chandler, E., Christiansen, H.H., Christy, J.R., Chung, D., Chung, E.-S., Cinque, K., Clem, K.R., Coelho, C.A., Cogley, J.G., Coldewey-Egbers, M., Colwell, S., Cooper, O.R., Copland, L., Cosca, C.E., Cross, J.N., Crotwell, M.J., Crouch, J., Davis, S.M., De Eyto, E., De Jeu, R.A.M., De Laat, J., Degasperi, C.L., Degenstein, D., Demircan, M., Derksen, C., Destin, D., Di Girolamo, L., Di Giuseppe, F., Diamond, H.J., Dlugokencky, E.J., Dohan, K., Dokulil, M.T., Dolgov, A.V., Dolman, A.J., Domingues, C.M., Donat, M.G., Dong, S., Dorigo, W.A., Dortch, Q., Doucette, G., Drozdov, D.S., Ducklow, H., Dunn, R.J.H., Durán-Quesada, A.M., Dutton, G.S., Ebrahim, A., Elkharrim, M., Elkins, J.W., Espinoza, J.C., Etienne-Leblanc, S., Evans, T.E., Famiglietti, J.S., Farrell, S., Fateh, S., Fausto, R.S., Fedaeff, N., Feely, R.A., Feng, Z., Fenimore, C., Fettweis, X., Fioletov, V.E., Flemming, J., Fogarty, C.T., Fogt, R.L., Folland, C., Fonseca, C., Fossheim, M., Foster, M.J., Fountain, A., Francis, S.D., Franz, B.A., Frey, R.A., Frith, S.M., Froidevaux, L., Ganter, C., Garzoli, S., Gerland, S., Gobron, N., Goldenberg, S.B., Gomez, R.S., Goni, G., Goto, A., Grooß, J.-U., Gruber, A., Guard, C.C., Gugliemin, M., Gupta, Somil, Gutiérrez, J.M., Hagos, S., Hahn, S., Haimberger, L., Hakkarainen, J., Hall, B.D., Halpert, M.S., Hamlington, B.D., Hanna, E., Hansen, K., Hanssen-Bauer, I., Harris, I., Heidinger, A.K., Heikkilä, A., Heil, A., Heim, R.R., Hendricks, S., Hernández, M., Hidalgo, H.G., Hilburn, K., Ho, S.-P.B., Holmes, R.M., Hu, Z.-Z., Huang, B., Huelsing, H.K., Huffman, G.J., Hughes, C., Hurst, D.F., Ialongo, I., Ijampy, J.A., Ingvaldsen, R.B., Inness, A., Isaksen, K., Ishii, M., Jevrejeva, S., Jiménez, C., Jin, X., Johannesen, E., John, V., Johnsen, B., Johnson, B., Johnson, G.C., Jones, P.D., Joseph, A.C., Jumaux, G., Kabidi, K., Kaiser, J.W., Kato, S., Kazemi, A., Keller, L.M., Kendon, M., Kennedy, J., Kerr, K., Kholodov, A.L., Khoshkam, M., Killick, R., Kim, H., Kim, S.-J., Kimberlain, T.B., Klotzbach, P.J., Knaff, J.A., Kobayashi, S., Kohler, J., Korhonen, J., Korshunova, N.N., Kovacs, K.M., Kramarova, N., Kratz, D.P., Kruger, A., Kruk, M.C., Kudela, R., Kumar, A., Lakatos, M., Lakkala, K., Lander, M.A., Landsea, C.W., Lankhorst, M., Lantz, K., Lazzara, M.A., Lemons, P., Leuliette, E., L’Heureux, M., Lieser, J.L., Lin, I.-I., Liu, H., Liu, Y., Locarnini, R., Loeb, N.G., Lo Monaco, C., Long, C.S., López Álvarez, L.A., Lorrey, A.M., Loyola, D., Lumpkin, R., Luo, J.-J., Luojus, K., Lydersen, C., Lyman, J.M., Maberly, S.C., Maddux, B.C., Malheiros Ramos, A., Malkova, G.V., Manney, G., Marcellin, V., Marchenko, S.S., Marengo, J.A., Marra, J.J., Marszelewski, W., Martens, B., Martínez-Güingla, R., Massom, R.A., Mata, M.M., Mathis, J.T., May, L., Mayer, M., Mazloff, M., McBride, C., McCabe, M.F., McCarthy, M., McClelland, J.W., McGree, S., McVicar, T.R., Mears, C.A., Meier, W., Meinen, C.S., Mekonnen, A., Menéndez, M., Mengistu Tsidu, G., Menzel, W.P., Merchant, C.J., Meredith, M.P., Merrifield, M.A., Metzl, N., Minnis, P., Miralles, D.G., Mistelbauer, T., Mitchum, G.T., Monselesan, D., Monteiro, P., Montzka, S.A., Morice, C., Mote, T., Mudryk, L., Mühle, J., Mullan, A.B., Nash, E.R., Naveira-Garabato, A.C., Nerem, R.S., Newman, P.A., Nieto, J.J., Noetzli, J., O’Neel, S., Osborn, T.J., Overland, J., Oyunjargal, L., Parinussa, R.M., Park, E.-H., Parker, D., Parrington, M., Parsons, A.R., Pasch, R.J., Pascual-Ramírez, R., Paterson, A.M., Paulik, C., Pearce, P.R., Pelto, M.S., Peng, L., Perkins-Kirkpatrick, S.E., Perovich, D., Petropavlovskikh, I., Pezza, A.B., Phillips, D., Pinty, B., Pitts, M.C., Pons, M.R., Porter, A.O., Primicerio, R., Proshutinsky, A., Quegan, S., Quintana, J., Rahimzadeh, F., Rajeevan, M., Randriamarolaza, L., Razuvaev, V.N., Reagan, J., Reid, P., Reimer, C., Rémy, S., Renwick, J.A., Revadekar, J.V., Richter-Menge, J., Riffler, M., Rimmer, A., Rintoul, S., Robinson, D.A., Rodell, M., Rodríguez Solís, J.L., Romanovsky, V.E., Ronchail, J., Rosenlof, K.H., Roth, C., Rusak, J.A., Sabine, C.L., Sallée, J.-B., Sánchez-Lugo, A., Santee, M.L., Sawaengphokhai, P., Sayouri, A., Scambos, T.A., Schemm, J., Schladow, S.G., Schmid, C., Schmid, M., Schmidtko, S., Schreck, C.J., Selkirk, H.B., Send, U., Sensoy, S., Setzer, A., Sharp, M., Shaw, A., Shi, L., Shiklomanov, A.I., Shiklomanov, N.I., Siegel, D.A., Signorini, S.R., Sima, F., Simmons, A.J., Smeets, C.J.P.P., Smith, S.L., Spence, J.M., Srivastava, A.K., Stackhouse, P.W., Stammerjohn, S., Steinbrecht, W., Stella, J.L., Stengel, M., Stennett-Brown, R., Stephenson, T.S., Strahan, S., Streletskiy, D.A., Sun-Mack, S., Swart, S., Sweet, W., Talley, L.D., Tamar, G., Tank, S.E., Taylor, M.A., Tedesco, M., Teubner, K., Thoman, R.L., Thompson, P., Thomson, L., Timmermans, M.-L., Tirnanes, J.A., Tobin, S., Trachte, K., Trainer, V.L., Tretiakov, M., Trewin, B.C., Trotman, A.R., Tschudi, M., Van As, D., Van De Wal, R.S.W., van der A., R.J., Van Der Schalie, R., Van Der Schrier, G., Van Der Werf, G.R., Van Meerbeeck, C.J., Velicogna, I., Verburg, P., Vigneswaran, B., Vincent, L.A., Volkov, D., Vose, R.S., Wagner, W., Wåhlin, A., Wahr, J., Walsh, J., Wang, C., Wang, J., Wang, L., Wang, M., Wang, S.-H., Wanninkhof, R., Watanabe, S., Weber, M., Weller, R.A., Weyhenmeyer, G.A., Whitewood, R., Wijffels, S.E., Wilber, A.C., Wild, J.D., Willett, K.M., Williams, M.J.M., Willie, S., Wolken, G., Wong, T., Wood, E.F., Woolway, R.I., Wouters, B., Xue, Y., Yamada, R., Yim, S.-Y., Yin, X., Young, S.H., Yu, L., Zahid, H., Zambrano, E., Zhang, P., Zhao, G., Zhou, L., Ziemke, J.R., Love-Brotak, S.E., Gilbert, K., Maycock, T., Osborne, S., Sprain, M., Veasey, S.W., Ambrose, B.J., Griffin, J., Misch, D.J., Riddle, D.B., Young, T., Marine and Atmospheric Research, Sub Inorganic Chemistry and Catalysis, Sub Dynamics Meteorology, Sub Soft Condensed Matter, Sub Molecular Microbiology, Sub Physics of devices begr 1/1/17, LS Logica en grondslagen v.d. wiskunde, Sub SIM overig, Zonder bezoldiging NED, Sub General Pharmaceutics, Sub Algemeen Artificial Intelligence, Dynamics of Innovation Systems, Leerstoel Tubergen, Sub Chemical pharmacology, Hafd Faculteitsbureau GW, Sub ISEP overig, Sub Gen. Pharmacoepi and Clinical Pharm, LS Pharma, Dep IRAS, Environmental Sciences, Environmental Governance, Bureau AW, Sub Ecology and Biodiversity, Aaron-Morrison, A.P., Ackerman, S.A., Adams, N.G., Adler, R.F., Albanil, A., Alfaro, E.J., Allan, R., Alves, L.M., Amador, J.A., Andreassen, L.M., Arendt, A., Arévalo, J., Arndt, D.S., Arzhanova, N.M., Aschan, M.M., Azorin-Molina, C., Banzon, V., Bardin, M.U., Barichivich, J., Baringer, M.O., Barreira, S., Baxter, S., Bazo, J., Becker, A., Bedka, K.M., Behrenfeld, M.J., Bell, G.D., Belmont, M., Benedetti, A., Bernhard, G., Berrisford, P., Berry, D.I., Bettolli, M.L., Bhatt, U.S., Bidegain, M., Bill, B.D., Billheimer, S., Bissolli, P., Blake, E.S., Blunden, J., Bosilovich, M.G., Boucher, O., Boudet, D., Box, J.E., Boyer, T., Braathen, G.O., Bromwich, D.H., Brown, R., Bulygina, O.N., Burgess, D., Calderón, B., Camargo, S.J., Campbell, J.D., Cappelen, J., Carrasco, G., Carter, B.R., Chambers, D.P., Chandler, E., Christiansen, H.H., Christy, J.R., Chung, D., Chung, E.-S., Cinque, K., Clem, K.R., Coelho, C.A., Cogley, J.G., Coldewey-Egbers, M., Colwell, S., Cooper, O.R., Copland, L., Cosca, C.E., Cross, J.N., Crotwell, M.J., Crouch, J., Davis, S.M., De Eyto, E., De Jeu, R.A.M., De Laat, J., Degasperi, C.L., Degenstein, D., Demircan, M., Derksen, C., Destin, D., Di Girolamo, L., Di Giuseppe, F., Diamond, H.J., Dlugokencky, E.J., Dohan, K., Dokulil, M.T., Dolgov, A.V., Dolman, A.J., Domingues, C.M., Donat, M.G., Dong, S., Dorigo, W.A., Dortch, Q., Doucette, G., Drozdov, D.S., Ducklow, H., Dunn, R.J.H., Durán-Quesada, A.M., Dutton, G.S., Ebrahim, A., Elkharrim, M., Elkins, J.W., Espinoza, J.C., Etienne-Leblanc, S., Evans, T.E., Famiglietti, J.S., Farrell, S., Fateh, S., Fausto, R.S., Fedaeff, N., Feely, R.A., Feng, Z., Fenimore, C., Fettweis, X., Fioletov, V.E., Flemming, J., Fogarty, C.T., Fogt, R.L., Folland, C., Fonseca, C., Fossheim, M., Foster, M.J., Fountain, A., Francis, S.D., Franz, B.A., Frey, R.A., Frith, S.M., Froidevaux, L., Ganter, C., Garzoli, S., Gerland, S., Gobron, N., Goldenberg, S.B., Gomez, R.S., Goni, G., Goto, A., Grooß, J.-U., Gruber, A., Guard, C.C., Gugliemin, M., Gupta, Somil, Gutiérrez, J.M., Hagos, S., Hahn, S., Haimberger, L., Hakkarainen, J., Hall, B.D., Halpert, M.S., Hamlington, B.D., Hanna, E., Hansen, K., Hanssen-Bauer, I., Harris, I., Heidinger, A.K., Heikkilä, A., Heil, A., Heim, R.R., Hendricks, S., Hernández, M., Hidalgo, H.G., Hilburn, K., Ho, S.-P.B., Holmes, R.M., Hu, Z.-Z., Huang, B., Huelsing, H.K., Huffman, G.J., Hughes, C., Hurst, D.F., Ialongo, I., Ijampy, J.A., Ingvaldsen, R.B., Inness, A., Isaksen, K., Ishii, M., Jevrejeva, S., Jiménez, C., Jin, X., Johannesen, E., John, V., Johnsen, B., Johnson, B., Johnson, G.C., Jones, P.D., Joseph, A.C., Jumaux, G., Kabidi, K., Kaiser, J.W., Kato, S., Kazemi, A., Keller, L.M., Kendon, M., Kennedy, J., Kerr, K., Kholodov, A.L., Khoshkam, M., Killick, R., Kim, H., Kim, S.-J., Kimberlain, T.B., Klotzbach, P.J., Knaff, J.A., Kobayashi, S., Kohler, J., Korhonen, J., Korshunova, N.N., Kovacs, K.M., Kramarova, N., Kratz, D.P., Kruger, A., Kruk, M.C., Kudela, R., Kumar, A., Lakatos, M., Lakkala, K., Lander, M.A., Landsea, C.W., Lankhorst, M., Lantz, K., Lazzara, M.A., Lemons, P., Leuliette, E., L’Heureux, M., Lieser, J.L., Lin, I.-I., Liu, H., Liu, Y., Locarnini, R., Loeb, N.G., Lo Monaco, C., Long, C.S., López Álvarez, L.A., Lorrey, A.M., Loyola, D., Lumpkin, R., Luo, J.-J., Luojus, K., Lydersen, C., Lyman, J.M., Maberly, S.C., Maddux, B.C., Malheiros Ramos, A., Malkova, G.V., Manney, G., Marcellin, V., Marchenko, S.S., Marengo, J.A., Marra, J.J., Marszelewski, W., Martens, B., Martínez-Güingla, R., Massom, R.A., Mata, M.M., Mathis, J.T., May, L., Mayer, M., Mazloff, M., McBride, C., McCabe, M.F., McCarthy, M., McClelland, J.W., McGree, S., McVicar, T.R., Mears, C.A., Meier, W., Meinen, C.S., Mekonnen, A., Menéndez, M., Mengistu Tsidu, G., Menzel, W.P., Merchant, C.J., Meredith, M.P., Merrifield, M.A., Metzl, N., Minnis, P., Miralles, D.G., Mistelbauer, T., Mitchum, G.T., Monselesan, D., Monteiro, P., Montzka, S.A., Morice, C., Mote, T., Mudryk, L., Mühle, J., Mullan, A.B., Nash, E.R., Naveira-Garabato, A.C., Nerem, R.S., Newman, P.A., Nieto, J.J., Noetzli, J., O’Neel, S., Osborn, T.J., Overland, J., Oyunjargal, L., Parinussa, R.M., Park, E.-H., Parker, D., Parrington, M., Parsons, A.R., Pasch, R.J., Pascual-Ramírez, R., Paterson, A.M., Paulik, C., Pearce, P.R., Pelto, M.S., Peng, L., Perkins-Kirkpatrick, S.E., Perovich, D., Petropavlovskikh, I., Pezza, A.B., Phillips, D., Pinty, B., Pitts, M.C., Pons, M.R., Porter, A.O., Primicerio, R., Proshutinsky, A., Quegan, S., Quintana, J., Rahimzadeh, F., Rajeevan, M., Randriamarolaza, L., Razuvaev, V.N., Reagan, J., Reid, P., Reimer, C., Rémy, S., Renwick, J.A., Revadekar, J.V., Richter-Menge, J., Riffler, M., Rimmer, A., Rintoul, S., Robinson, D.A., Rodell, M., Rodríguez Solís, J.L., Romanovsky, V.E., Ronchail, J., Rosenlof, K.H., Roth, C., Rusak, J.A., Sabine, C.L., Sallée, J.-B., Sánchez-Lugo, A., Santee, M.L., Sawaengphokhai, P., Sayouri, A., Scambos, T.A., Schemm, J., Schladow, S.G., Schmid, C., Schmid, M., Schmidtko, S., Schreck, C.J., Selkirk, H.B., Send, U., Sensoy, S., Setzer, A., Sharp, M., Shaw, A., Shi, L., Shiklomanov, A.I., Shiklomanov, N.I., Siegel, D.A., Signorini, S.R., Sima, F., Simmons, A.J., Smeets, C.J.P.P., Smith, S.L., Spence, J.M., Srivastava, A.K., Stackhouse, P.W., Stammerjohn, S., Steinbrecht, W., Stella, J.L., Stengel, M., Stennett-Brown, R., Stephenson, T.S., Strahan, S., Streletskiy, D.A., Sun-Mack, S., Swart, S., Sweet, W., Talley, L.D., Tamar, G., Tank, S.E., Taylor, M.A., Tedesco, M., Teubner, K., Thoman, R.L., Thompson, P., Thomson, L., Timmermans, M.-L., Tirnanes, J.A., Tobin, S., Trachte, K., Trainer, V.L., Tretiakov, M., Trewin, B.C., Trotman, A.R., Tschudi, M., Van As, D., Van De Wal, R.S.W., van der A., R.J., Van Der Schalie, R., Van Der Schrier, G., Van Der Werf, G.R., Van Meerbeeck, C.J., Velicogna, I., Verburg, P., Vigneswaran, B., Vincent, L.A., Volkov, D., Vose, R.S., Wagner, W., Wåhlin, A., Wahr, J., Walsh, J., Wang, C., Wang, J., Wang, L., Wang, M., Wang, S.-H., Wanninkhof, R., Watanabe, S., Weber, M., Weller, R.A., Weyhenmeyer, G.A., Whitewood, R., Wijffels, S.E., Wilber, A.C., Wild, J.D., Willett, K.M., Williams, M.J.M., Willie, S., Wolken, G., Wong, T., Wood, E.F., Woolway, R.I., Wouters, B., Xue, Y., Yamada, R., Yim, S.-Y., Yin, X., Young, S.H., Yu, L., Zahid, H., Zambrano, E., Zhang, P., Zhao, G., Zhou, L., Ziemke, J.R., Love-Brotak, S.E., Gilbert, K., Maycock, T., Osborne, S., Sprain, M., Veasey, S.W., Ambrose, B.J., Griffin, J., Misch, D.J., Riddle, D.B., and Young, T.

Published
2016

16. Greenland ice sheet

Author

Tedesco, M., Alexander, P., Box, J.E., Cappelen, J., Mote, T., Steffen, K., van de Wal, R.S.W., Wahr, J., Wouters, B., Blunden, Jessica, Arndt, Derek S., Marine and Atmospheric Research, and Sub Dynamics Meteorology

Abstract

Forty marine-terminating glaciers have been surveyed daily since 2000 using cloud-free MODIS visible imagery (Box and Decker 2011; http://bprc. osu.edu/MODIS/). The net area change of the 40 glaciers during the period of observation has been -1775 km2, with the 18 northernmost (>72°N) glaciers alone contributing to half of the net area change. In 2012, the northernmost glaciers lost a collective area of 255 km2, or 86% of the total net area change of the 40 glaciers surveyed. The six glaciers with the largest net area loss in 2012 were Petermann (-141 km2), 79 glacier (-27 km2), Zachariae (-26 km2), Steenstrup (-19 km2), Steensby (-16 km2, the greatest retreat since observations began), and Jakobshavn (-13 km2). While the total area change was negative in 2012, the area of four of the forty glaciers did increase relative to the end of the 2011 melt season. The anomalous advance of these four glaciers is not easily explained, as the mechanisms controlling the behavior of individual glaciers are uncertain due to their often unique geographic!settings.

Published
2013

17. Greenland Ice Sheet Mass Balance Reconstruction. Part I: Net Snow Accumulation (1600–2009)

Author

Box, J.E., Cressie, N., Bromwich, D.H., Jung, J.-H., van den Broeke, M.R., van Angelen, J.H., Forster, R.R., Miège, C., Mosley-Thompson, E., Vinther, B., McConnell, J.R., Marine and Atmospheric Research, and Sub Dynamics Meteorology

Abstract

Ice core data are combined with Regional Atmospheric Climate Model version 2 (RACMO2) output (1958–2010) to develop a reconstruction of Greenland ice sheet net snow accumulation rate, ^At(G), spanning the years 1600–2009. Regression parameters from regional climate model (RCM) output regressed on 86 ice cores are used with available cores in a given year resulting in the reconstructed values. Each core site’s residual variance is used to inversely weight the cores’ respective contributions. The interannual amplitude of the reconstructed accumulation rate is damped by the regressions and is thus calibrated to match that of the RCM data. Uncertainty and significance of changes is measured using statistical models. A 12% or 86 Gt yr21 increase in ice sheet accumulation rate is found from the end of the Little Ice Age in ;1840 to the last decade of the reconstruction. This 1840–1996 trend is 30% higher than that of 1600–2009, suggesting an accelerating accumulation rate. The correlation of ^A t(G) with the average surface air temperature in the Northern Hemisphere (SATNHt) remains positive through time, while the correlation of ^A t(G) with local near-surface air temperatures or North Atlantic sea surface temperatures is inconsistent, suggesting a hemispheric-scale climate connection. An annual sensitivity of ^At(G) to SATNHt of 6.8%K21 or 51 Gt K21 is found. The reconstuction, ^At(G), correlates consistently highly with the North Atlantic Oscillation index. However, at the 11-yr time scale, the sign of this correlation flips four times in the 1870–2005 period.

Published
2013

18. Greenland

Author

Box, J.E., Ahlstrøm, A., Cappelen, J., Fettweis, X., Decker, D., Mote, T., van As, D., van de Wal, R.S.W., Vinther, B., Wahr, J., Blunden, J., Arndt, D.S., Baringer, M.O., Marine and Atmospheric Research, Afd Marine and Atmospheric Research, and Dep Natuurkunde

Abstract

Coastal Surface Air Temperatures Record-setting high air temperatures were registered at all of the west Greenland long-term meteorological stations (Table 5.2). At Nuuk (Fig. 5.19), winter 2009/10 and spring and summer in 2010 were the warmest since 1873, when measurements began. At Prins Christian Sund, as at Nuuk, 2010 annual anomalies were three standard deviations above the 1971–2000 baseline. Warm anomalies were greatest at Aasiaat, where winter temperatures were 7°C above the 1971–2000 baseline, which is three standard deviations above the mean. Temperature anomalies extended west into Arctic Canada (see also section 5e5), but not into east and northeast Greenland.

Published
2011

19. The role of albedo and accumulation in the 2010 melting record in Greenland

Author

Tedesco, M., Fettweis, X., van den Broeke, M.R., van de Wal, R.S.W., Smeets, C.J.P.P., van de Berg, W.J., Serreze, M.C., Box, J.E., Marine and Atmospheric Research, Dep Natuurkunde, and Sub Dynamics Meteorology

Subjects
geography, geography.geographical_feature_category, Renewable Energy, Sustainability and the Environment, Public Health, Environmental and Occupational Health, Ice-albedo feedback, Greenland ice sheet, Snowpack, Albedo, Snow, Glacier mass balance, Climatology, Ice sheet, Meltwater, Geology, General Environmental Science
Abstract

Analyses of remote sensing data, surface observations and output from a regional atmosphere model point to new records in 2010 for surface melt and albedo, runoff, the number of days when bare ice is exposed and surface mass balance of the Greenland ice sheet, especially over its west and southwest regions. Early melt onset in spring, triggered by above-normal near-surface air temperatures, contributed to accelerated snowpack metamorphism and premature bare ice exposure, rapidly reducing the surface albedo. Warm conditions persisted through summer, with the positive albedo feedback mechanism being a major contributor to large negative surface mass balance anomalies. Summer snowfall was below average. This helped to maintain low albedo through the 2010 melting season, which also lasted longer than usual.

Published
2011

20. Greenland

Author

Box, J.E., Cappelen, J., Decker, D., Fettweis, X., Mote, T., Tedesco, M., and van de Wal, R.S.W.

Published
2010

21. Climate of the greenland ice sheet using a high - resolution climate model - part 1 : evaluation

Author

Ettema, J., van den Broeke, M.R., van Meijgaard, E., van de Berg, W.J., Box, J.E., Steffen, K., Marine and Atmospheric Research, Sub Dynamics Meteorology, Department of Earth Systems Analysis, Faculty of Geo-Information Science and Earth Observation, UT-I-ITC-4DEarth, and Sub Dynamics Meteorology

Subjects
Runoff, Greenland ice sheet, Reanalysis, Wind, Atmospheric sciences, Weather station data, Sea ice growth processes, Cryosphere, West greenland, Meltwater, Sea ice concentration, lcsh:Environmental sciences, Earth-Surface Processes, Water Science and Technology, lcsh:GE1-350, Transfer-coefficients, geography, geography.geographical_feature_category, lcsh:QE1-996.5, Temperature, METIS-304362, Roughness, Mass-balance, lcsh:Geology, Climatology, ITC-ISI-JOURNAL-ARTICLE, Sea ice thickness, Antarctica, Environmental science, Climate model, Ice sheet
Abstract

A simulation of 51 years (1957–2008) has been performed over Greenland using the regional atmospheric climate model (RACMO2/GR) at a horizontal grid spacing of 11 km and forced by ECMWF re-analysis products. To better represent processes affecting ice sheet surface mass balance, such as meltwater refreezing and penetration, an additional snow/ice surface module has been developed and implemented into the surface part of the climate model. The temporal evolution and climatology of the model is evaluated with in situ coastal and ice sheet atmospheric measurements of near-surface variables and surface energy balance components. The bias for the near-surface air temperature (−0.8 °C), specific humidity (0.1 g kg−1), wind speed (0.3 m s−1) as well as for radiative (2.5 W m−2 for net radiation) and turbulent heat fluxes shows that the model is in good accordance with available observations on and around the ice sheet. The modelled surface energy budget underestimates the downward longwave radiation and overestimates the sensible heat flux. Due to their compensating effect, the averaged 2 m temperature bias is small and the katabatic wind circulation well captured by the model.

Published
2010

22. Higher surface mass balance of the Greenland ice sheet revealed by high-resolution climate modeling

Author

Ettema, J., van den Broeke, M.R., van Meijgaard, E., van de Berg, W.J., Bamber, Jonathan L., Box, J.E., Bales, R.C., Marine and Atmospheric Research, Dep Natuurkunde, and Sub Dynamics Meteorology

Subjects
International (English)
Abstract

High-resolution (∼11 km) regional climate modeling shows total annual precipitation on the Greenland ice sheet for 1958–2007 to be up to 24% and surface mass balance up to 63% higher than previously thought. The largest differences occur in coastal southeast Greenland, where the much higher resolution facilitates capturing snow accumulation peaks that past five-fold coarser resolution regional climate models missed. The surface mass balance trend over the full 1958–2007 period reveals the classic pattern expected in a warming climate, with increased snowfall in the interior and enhanced runoff from the marginal ablation zone. In the period 1990–2007, total runoff increased significantly, 3% per year. The absolute increase in runoff is especially pronounced in the southeast, where several outlet glaciers have recently accelerated. This detailed knowledge of Greenland's surface mass balance provides the foundation for estimating and predicting the overall mass balance and freshwater discharge of the ice sheet

Published
2009

23. Surface mass balance model intercomparison for the Greenland ice sheet

Author

Vernon, C.L., Bamber, J.L., Box, J.E., van den Broeke, M.R., Fettweis, X., Hanna, E., Huybrechts, P., Vernon, C.L., Bamber, J.L., Box, J.E., van den Broeke, M.R., Fettweis, X., Hanna, E., and Huybrechts, P.

Abstract

A number of high resolution reconstructions of the surface mass balance (SMB) of the Greenland ice sheet (GrIS) have been produced using global re-analyses data extending back to 1958. These reconstructions have been used in a variety of applications but little is known about their consistency with each other and the impact of the downscaling method on the result. Here, we compare four reconstructions for the period 1960–2008 to assess the consistency in regional, seasonal and integrated SMB components. Total SMB estimates for the GrIS are in agreement within 34% of the four model average when a common ice sheet mask is used. When models’ native land/ice/sea masks are used this spread increases to 57 %. Variation in the spread of components of SMB from their mean: runoff 42% (29% native masks), precipitation 20% (24% native masks), melt 38% (74% native masks), refreeze 83% (142% native masks) show, with the exception of refreeze, a similar level of agreement once a common mask is used. Previously noted differences in the models’ estimates are partially explained by ice sheet mask differences. Regionally there is less agreement, suggesting spatially compensating errors improve the integrated estimates. Modelled SMB estimates are compared with in situ observations from the accumulation and ablation areas. Agreement is higher in the accumulation area than the ablation area suggesting relatively high uncertainty in the estimation of ablation processes. Since the mid-1990s each model estimates a decreasing annual SMB. A similar period of decreasing SMB is also estimated for the period 1960–1972. The earlier decrease is due to reduced precipitation with runoff remaining unchanged, however, the recent decrease is associated with increased precipitation, now more than compensated for by increased melt driven runoff. Additionally, in three of the four models the equilibrium line altitude has risen since the mid-1990s, reducing the accumulation area at a rate of approximately

Published
2013

24. Evidence of meltwater retention within the Greenland ice sheet

Author

Rennermalm, A.K., Smith, L.C., Chu, V.W., Box, J.E., Forster, R.R., van den Broeke, M.R., van As, D., Moustafa, S.E., Rennermalm, A.K., Smith, L.C., Chu, V.W., Box, J.E., Forster, R.R., van den Broeke, M.R., van As, D., and Moustafa, S.E.

Abstract

Greenland ice sheet mass losses have increased in recent decades with more than half of these attributed to surface meltwater runoff. However, the magnitudes of englacial storage, firn retention, internal refreezing and other hydrologic processes that delay or reduce true water export to the global ocean remain less understood, partly due to a scarcity of in situ measurements. Here, ice sheet surface meltwater runoff and proglacial river discharge between 2008 and 2010 near Kangerlussuaq, southwestern Greenland were used to establish sub- and englacial meltwater storage for a small ice sheet watershed (36–64 km2). This watershed lacks significant potential meltwater storage in firn, surface lakes on the ice sheet and in the proglacial area, and receives limited proglacial precipitation. Thus, ice sheet surface runoff not accounted for by river discharge can reasonably be attributed to retention in sub- and englacial storage. Evidence for meltwater storage within the ice sheet includes (1) characteristic dampened daily river discharge amplitudes relative to ice sheet runoff; (2) three cold-season river discharge anomalies at times with limited ice sheet surface melt, demonstrating that meltwater may be retained up to 1–6 months; (3) annual ice sheet watershed runoff is not balanced by river discharge, and while near water budget closure is possible as much as 54% of melting season ice sheet runoff may not escape to downstream rivers; (4) even the large meltwater retention estimate (54%) is equivalent to less than 1% of the ice sheet volume, which suggests that storage in en- and subglacial cavities and till is plausible. While this study is the first to provide evidence for meltwater retention and delayed release within the Greenland ice sheet, more information is needed to establish how widespread this is along the Greenland ice sheet perimeter.

Published
2013

25. Evidence of meltwater retention within the Greenland ice sheet

Author

Marine and Atmospheric Research, Sub Dynamics Meteorology, Afd Marine and Atmospheric Research, Rennermalm, A.K., Smith, L.C., Chu, V.W., Box, J.E., Forster, R.R., van den Broeke, M.R., van As, D., Moustafa, S.E., Marine and Atmospheric Research, Sub Dynamics Meteorology, Afd Marine and Atmospheric Research, Rennermalm, A.K., Smith, L.C., Chu, V.W., Box, J.E., Forster, R.R., van den Broeke, M.R., van As, D., and Moustafa, S.E.

Published
2013

26. Greenland ice sheet

Author

Marine and Atmospheric Research, Sub Dynamics Meteorology, Tedesco, M., Alexander, P., Box, J.E., Cappelen, J., Mote, T., Steffen, K., van de Wal, R.S.W., Wahr, J., Wouters, B., Blunden, Jessica, Arndt, Derek S., Marine and Atmospheric Research, Sub Dynamics Meteorology, Tedesco, M., Alexander, P., Box, J.E., Cappelen, J., Mote, T., Steffen, K., van de Wal, R.S.W., Wahr, J., Wouters, B., Blunden, Jessica, and Arndt, Derek S.

Published
2013

27. Greenland Ice Sheet Mass Balance Reconstruction. Part I: Net Snow Accumulation (1600–2009)

Author

Marine and Atmospheric Research, Sub Dynamics Meteorology, Box, J.E., Cressie, N., Bromwich, D.H., Jung, J.-H., van den Broeke, M.R., van Angelen, J.H., Forster, R.R., Miège, C., Mosley-Thompson, E., Vinther, B., McConnell, J.R., Marine and Atmospheric Research, Sub Dynamics Meteorology, Box, J.E., Cressie, N., Bromwich, D.H., Jung, J.-H., van den Broeke, M.R., van Angelen, J.H., Forster, R.R., Miège, C., Mosley-Thompson, E., Vinther, B., and McConnell, J.R.

Published
2013

28. Surface mass balance model intercomparison for the Greenland ice sheet

Author

Institute for Marine and Atmospheric Research, Marine and Atmospheric Research, Sub Dynamics Meteorology, Vernon, C.L., Bamber, J.L., Box, J.E., van den Broeke, M.R., Fettweis, X., Hanna, E., Huybrechts, P., Institute for Marine and Atmospheric Research, Marine and Atmospheric Research, Sub Dynamics Meteorology, Vernon, C.L., Bamber, J.L., Box, J.E., van den Broeke, M.R., Fettweis, X., Hanna, E., and Huybrechts, P.

Published
2013

29. Twentieth-Century Global-Mean Sea Level Rise: Is the Whole Greater than the Sum of the Parts?

Author

Gregory, J.M., White, N.J., Church, J.A., Bierkens, M.F.P., Box, J.E., van den Broeke, M R., Cogley, J.G., Fettweis, X., Hanna, E., Huybrechts, P., Konikow, L.F., Leclercq, P.W., Marzeion, B., Oerlemans, J., Tamisiea, M.E., Wada, Y., Wake, L.M., van de Wal, R.S.W., Gregory, J.M., White, N.J., Church, J.A., Bierkens, M.F.P., Box, J.E., van den Broeke, M R., Cogley, J.G., Fettweis, X., Hanna, E., Huybrechts, P., Konikow, L.F., Leclercq, P.W., Marzeion, B., Oerlemans, J., Tamisiea, M.E., Wada, Y., Wake, L.M., and van de Wal, R.S.W.

Abstract

Confidence in projections of global-mean sea level rise (GMSLR) depends on an ability to account for GMSLR during the twentieth century. There are contributions from ocean thermal expansion, mass loss from glaciers and ice sheets, groundwater extraction, and reservoir impoundment. Progress has been made toward solving the “enigma” of twentieth-century GMSLR, which is that the observed GMSLR has previously been found to exceed the sum of estimated contributions, especially for the earlier decades. The authors propose the following: thermal expansion simulated by climate models may previously have been underestimated because of their not including volcanic forcing in their control state; the rate of glacier mass loss was larger than previously estimated and was not smaller in the first half than in the second half of the century; the Greenland ice sheet could have made a positive contribution throughout the century; and groundwater depletion and reservoir impoundment, which are of opposite sign, may have been approximately equal in magnitude. It is possible to reconstruct the time series of GMSLR from the quantified contributions, apart from a constant residual term, which is small enough to be explained as a long-term contribution from the Antarctic ice sheet. The reconstructions account for the observation that the rate of GMSLR was not much larger during the last 50 years than during the twentieth century as a whole, despite the increasing anthropogenic forcing. Semiempirical methods for projecting GMSLR depend on the existence of a relationship between global climate change and the rate of GMSLR, but the implication of the authors' closure of the budget is that such a relationship is weak or absent during the twentieth century.

Published
2013

30. Greenland's shrinking ice cover: 'fast times' but not that fast

Author

Kargel, J.S., Ahlstrom, A.P., Alley, R.B., Bamber, J.L., Benham, T.J., Box, J.E., Chen, C., Christoffersen, P., Citterio, M., Cogley, J.G., Jiskoot, Hester, Leonard, G.J., Morin, P., Scambos, T., Sheldon, T., Willis, I., Kargel, J.S., Ahlstrom, A.P., Alley, R.B., Bamber, J.L., Benham, T.J., Box, J.E., Chen, C., Christoffersen, P., Citterio, M., Cogley, J.G., Jiskoot, Hester, Leonard, G.J., Morin, P., Scambos, T., Sheldon, T., and Willis, I.

Abstract

A map of Greenland in the 13th edition (2011) of the Times Comprehensive Atlas of the World made headlines because the publisher’s media release mistakenly stated that the permanent ice cover had shrunk 15% since the previous 10th edition (1999) revision. The claimed shrinkage was immediately challenged by glaciologists, then retracted by the publisher. Here we show: (1) accurate maps of ice extent based on 1978/87 aerial surveys and recent MODIS imagery; and (2) shrinkage at 0.019%a−1 in 50 000 km2 of ice in a part of east Greenland that is shown as ice-free in the Times Atlas.

Published
2012

31. Twentieth-century global-mean sea-level rise: is the whole greater than the sum of the parts?

Author

Gregory, J.M., White, N.J., Church, J.A., Bierkens, M.F.P., Box, J.E., Broeke, M.R. van den, Cogley, J.G., Fettweis, X., Hanna, E., Huybrechts, P., Konikow, L.F., Leclercq, P.W., Marzeion, B., Oerlemans, J., Tamisiea, E., Wada, Y., Gregory, J.M., White, N.J., Church, J.A., Bierkens, M.F.P., Box, J.E., Broeke, M.R. van den, Cogley, J.G., Fettweis, X., Hanna, E., Huybrechts, P., Konikow, L.F., Leclercq, P.W., Marzeion, B., Oerlemans, J., Tamisiea, E., and Wada, Y.

Published
2012

32. Record Summer Melt in Greenland in 2010

Author

Tedesco, M., Fettweis, X., van den Broeke, M.R., van de Wal, R.S.W., Smeets, C.J.P.P., van de Berg, W.J., Serreze, M.C., Box, J.E., Tedesco, M., Fettweis, X., van den Broeke, M.R., van de Wal, R.S.W., Smeets, C.J.P.P., van de Berg, W.J., Serreze, M.C., and Box, J.E.

Abstract

As Arctic temperatures increase, there is growing concern about the melting of the Greenland ice sheet, which reached a new record during the summer of 2010. Understanding the changing surface mass balance of the Greenland ice sheet requires appreciation of the close links among changes in surface air temperature, surface melting, albedo, and snow accumulation. Increased melting accelerates surface snow grain growth, leading to a decrease in surface albedo, which then fosters further melt. In turn, winter accumulation contributes to determining how much snow is required before a dark (e.g., lower albedo), bare ice surface is exposed in spring

Published
2011

33. The role of albedo and accumulation in the 2010 melting record in Greenland

Author

Marine and Atmospheric Research, Dep Natuurkunde, Sub Dynamics Meteorology, Tedesco, M., Fettweis, X., van den Broeke, M.R., van de Wal, R.S.W., Smeets, C.J.P.P., van de Berg, W.J., Serreze, M.C., Box, J.E., Marine and Atmospheric Research, Dep Natuurkunde, Sub Dynamics Meteorology, Tedesco, M., Fettweis, X., van den Broeke, M.R., van de Wal, R.S.W., Smeets, C.J.P.P., van de Berg, W.J., Serreze, M.C., and Box, J.E.

Published
2011

34. Greenland

Author

Marine and Atmospheric Research, Afd Marine and Atmospheric Research, Dep Natuurkunde, Box, J.E., Ahlstrøm, A., Cappelen, J., Fettweis, X., Decker, D., Mote, T., van As, D., van de Wal, R.S.W., Vinther, B., Wahr, J., Blunden, J., Arndt, D.S., Baringer, M.O., Marine and Atmospheric Research, Afd Marine and Atmospheric Research, Dep Natuurkunde, Box, J.E., Ahlstrøm, A., Cappelen, J., Fettweis, X., Decker, D., Mote, T., van As, D., van de Wal, R.S.W., Vinther, B., Wahr, J., Blunden, J., Arndt, D.S., and Baringer, M.O.

Published
2011

35. Record Summer Melt in Greenland in 2010

Author

Marine and Atmospheric Research, Dep Natuurkunde, Sub Dynamics Meteorology, Tedesco, M., Fettweis, X., van den Broeke, M.R., van de Wal, R.S.W., Smeets, C.J.P.P., van de Berg, W.J., Serreze, M.C., Box, J.E., Marine and Atmospheric Research, Dep Natuurkunde, Sub Dynamics Meteorology, Tedesco, M., Fettweis, X., van den Broeke, M.R., van de Wal, R.S.W., Smeets, C.J.P.P., van de Berg, W.J., Serreze, M.C., and Box, J.E.

Published
2011

37. Higher surface mass balance of the Greenland ice sheet revealed by high-resolution climate modeling

Author

Marine and Atmospheric Research, Dep Natuurkunde, Sub Dynamics Meteorology, Ettema, J., van den Broeke, M.R., van Meijgaard, E., van de Berg, W.J., Bamber, Jonathan L., Box, J.E., Bales, R.C., Marine and Atmospheric Research, Dep Natuurkunde, Sub Dynamics Meteorology, Ettema, J., van den Broeke, M.R., van Meijgaard, E., van de Berg, W.J., Bamber, Jonathan L., Box, J.E., and Bales, R.C.

Published
2009

42. Solute transport at the pedon and polypedon scales.

Author

Radcliffe, D.E., Gupte, S.M., and Box, J.E.

Abstract

Soil solute transport parameters are usually measured at the pedon scale, but predictions of transport at the polypedon scale are often required. Our objectives were to compare pedon- and polypedon-scale convection dispersion equation (CDE) transport parameters measured in a field leaching experiment and to compare deterministic and stochastic predictions of polypedon-scale transport. The study was conducted near Watkinsville, Ga. on a 12.5 by 30.5 m plot. Time domain reflectometry (TDR) waveguides (30 and 60 cm in length) were installed vertically at 80 locations to measure water content and impedance. The plot was irrigated and a Cl pulse was used as a tracer. We found very good agreement between the average CDE parameters measured at the pedon scale and those estimated at the polypedon scale in the 0–30 and 0–60 cm depth intervals. Although the variability in average pore velocities between pedons was large, the variability in velocities within a pedon caused by hydrodynamic dispersion was greater. As a result, a deterministic approach based on the CDE more accurately predicted the estimated polypedon scale breakthrough curve (BTC) at 30 and 60 cm depths than a stochastic approach based on the convective lognormal transfer function (CLT). This indicates that the pedon serves as a representative elementary volume (REV) for solute transport in this soil. [ABSTRACT FROM AUTHOR]

Published
1998
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43. Greenland

Author

Box, J.E., Bai, L.-S., Bensen, R., Bhattacharaya, I., Bromwich, D.H., Cappelen, J., Decker, D., NiGirolamo, N., Fettweis, X., Hall, D., Hanna, E., Mote, T., Tedesco, M., van de Wal, R., van den Broeke, M., Box, J.E., Bai, L.-S., Bensen, R., Bhattacharaya, I., Bromwich, D.H., Cappelen, J., Decker, D., NiGirolamo, N., Fettweis, X., Hall, D., Hanna, E., Mote, T., Tedesco, M., van de Wal, R., and van den Broeke, M.

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