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2. Regional to global assessments of phytoplankton dynamics from the SeaWiFS mission

Author

Siegel, D.A., Behrenfeld, M.J., Maritorena, S., McClain, C.R., Antoine, D., Bailey, S.W., Bontempi, P.S., Boss, E.S., Dierssen, H.M., Doney, S.C., Eplee, R.E., Jr., Evans, R.H., Feldman, G.C., Fields, E., Franz, B.A., Kuring, N.A., Mengelt, C., Nelson, N.B., Patt, F.S., Robinson, W.D., Sarmiento, J.L., Swan, C.M., Werdell, P.J., Westberry, T.K., Wilding, J.G., and Yoder, J.A.

Published
2013
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8. The stochastic nature of larval connectivity among nearshore marine populations

Author

Siegel, D.A., Mitarai, S., Costello, C.J., Gaines, S.D., Kendall, B.E., Warner, R.R., and Winters, K.B.

Subjects
Coastal ecology -- Research, Oceanography -- Research, Fish industry -- Management, Fisheries -- Management, Fishes -- Larvae, Fishes -- Distribution, Fishes -- Models, Company business management, Company distribution practices, Science and technology
Abstract

Many nearshore fish and invertebrate populations are overexploited even when apparently coherent management structures are in place. One potential cause of mismanagement may be a poor understanding and accounting of stochasticity, particularly for stock recruitment. Many of the fishes and invertebrates that comprise nearshore fisheries are relatively sedentary as adults but have an obligate larval pelagic stage that is dispersed by ocean currents. Here, we demonstrate that larval connectivity is inherently an intermittent and heterogeneous process on annual time scales. This stochasticity arises from the advection of pelagic larvae by chaotic coastal circulations. This result departs from typical assumptions where larvae simply diffuse from one site to another or where complex connectivity patterns are created by transport within spatially complicated environments. We derive a statistical model for the expected variability in larval settlement patterns and demonstrate how larval connectivity varies as a function of different biological and physical processes. The stochastic nature of larval connectivity creates an unavoidable uncertainty in the assessment of fish recruitment and the resulting forecasts of sustainable yields. coastal oceanography | fisheries | marine ecology

Published
2008

9. Effects of solar radiation on dimethylsulfide cycling in the western Atlantic Ocean

Author

Toole, D.A., Slezak, D., Kiene, R.P., Kieber, D.J., and Siegel, D.A.

Subjects
Sulfur compounds -- Analysis, Sulfur compounds -- Production processes, Ocean -- Analysis, Sea-water -- Analysis, Radiation -- Analysis, Photolysis -- Analysis, Earth sciences
Abstract

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.dsr.2005.09.003 Byline: D.A. Toole (a), D. Slezak (b)(c), R.P. Kiene (b)(c), D.J. Kieber (d), D.A. Siegel (a) Keywords: Sulfur compounds; Dimethylsulfide; Ultraviolet radiation; Photochemistry; Rate constants; Light attenuation; North Atlantic; Sargasso Sea; Gulf of Maine Abstract: The influence of solar radiation on springtime rates of photochemical and biological consumption of dimethylsulfide (DMS) in surface waters from the western Atlantic Ocean was examined by exposing 0.2[mu]m filtered and unfiltered surface seawater to natural sunlight at five depths in the upper 30m. Parallel deck incubations of 0.2[mu]m filtered seawater under various long-pass optical filters were also carried out to aid in assessing the wavelength dependence of DMS photolysis. DMS photolysis rate constants for mid-day exposure ([approximately equal to]10:30-17:30 local time) to surface irradiance ranged from 0.026 to 0.086h.sup.-1 and were highest in coastal and shelf waters. Photolysis rate constants decreased with increasing irradiation depth, in accordance with the attenuation of ultraviolet radiation (UVR, 280-400nm). Total DMS consumption rates (photochemical+biological) in unfiltered surface samples also decreased with increasing incubation depth and were larger than photolysis rates at nearly all depths and all stations. The decrease in photolysis rate constants with exposure depth was mirrored by biological DMS consumption rate constants that were severely inhibited at surface irradiances, and approached or exceeded dark rate constants at deeper exposure depths. Photolysis rates were 2-19 times greater than estimated biological consumption rates in the surface light exposed samples, while biological consumption rates were significantly larger than photolysis rates at incubation depths below the 1% light level for UV-B radiation (280-320nm). Total DMS loss rates increased up to nine-fold with UVR exposure, but changes in DMS concentrations were not strongly correlated to light dose, presumably due to parallel, light-mediated DMS production processes. The primary loss process for DMS depended mainly on the depth interval considered and the attenuation of UVR; in general, photochemical removal dominated shallow layers characterized by high UV-B intensities, whereas biological removal dominated in deeper layers where UV-B was absent, but UV-A (320-400nm) and visible (400-700nm) light fluxes were still relatively high. These results demonstrate that UVR exposure significantly influences the spatial and temporal pattern of DMS production and loss processes, and ultimately the DMS flux to the atmosphere. Author Affiliation: (a) Institute for Computational Earth System Science, University of California, Santa Barbara, CA 93106, USA (b) Department of Marine Sciences, University of South Alabama, Mobile, AL 36688, USA (c) Dauphin Island Sea Lab, Dauphin Island, AL 36528, USA (d) Chemistry Department, College of Environmental Science and Forestry, State University of New York, Syracuse, NY 13210, USA Article History: Received 19 November 2004; Revised 29 July 2005; Accepted 2 September 2005

Published
2006

10. The North Atlantic spring phytoplankton bloom and Sverdrup's critical depth hypothesis. (Reports)

Author

Siegel, D.A., Doney, S.C., and Yoders, J.A.

Subjects
North Atlantic Ocean -- Natural history, Carbon cycle (Biogeochemistry) -- Research -- Methods, Water bloom -- Research -- Methods, Plankton research -- Methods -- Research, Science and technology, Research, Natural history, Methods
Abstract

More than 50 years ago, Harald Sverdrup developed a simple model for the necessary conditions leading to the spring bloom of phytoplankton. Although this mode[ has been used extensively across a variety of aquatic ecosystems, its application requires know[edge of community compensation irradiance ([I.sub.C]), the fight level where photosynthetic and ecosystem community loss processes balance. However, reported [I.sub.C] values have varied by an order of magnitude. Here, [I.sub.C] estimates are determined using satellite and hydrographic data sets consistent with the assumptions in Sverdrup's 1953 critical depth hypothesis. Retrieved values of /c are approximately uniform throughout much of the North Atlantic with a mean value of 1.3 mol photons [meter.sup.-2] [day.sup.-1]. These community-based [I.sub.C] determinations are roughly twice typical values found for phytoplankton alone indicating that phytoplankton account for approximately one-half of community ecosystem losses. This work also suggests that important aspects of heterotrophic community dynamics can be assessed using satellite observations., The spring bloom of phytoplankton in the North Atlantic Ocean has long fascinated oceanographers from the 1930s to 1950s (1-3) to the present day, where large interdisciplinary field experiments have [...]

Published
2002

11. Seasonal dynamics of colored dissolved material in the Sargasso Sea

Author

Nelson, N.B., Siegel, D.A., and Michaels, A.F.

Subjects
Sargasso Sea -- Environmental aspects, Ocean -- Environmental aspects, Earth sciences
Abstract

The nature of colored dissolved material (CDM) light attenuation was characterized and its seasonal cycles in relation to hydrographic and biogeochemical processes in the Sargasso Sea were defined. Findings showed that CDM absorption made up an average of more than one-half of the total non-water absorption coefficient, while detrital particulate absorption was generally a minor constituent. The vertically integrated stock of CDM increased from the beginning of spring until the end of summer in 1994 and 1995. Near-surface values were depressed near the surface during summer.

Published
1998

12. Trajectories of sinking particles in the Sargasso Sea: modeling of statistical funnels above deep-ocean sediment traps

Author

Siegel, D.A. and Deuser, W.G.

Subjects
Sargasso Sea -- Environmental aspects, Oceanographic research -- Observations, Ocean circulation -- Research, Earth sciences
Abstract

The use of sediment traps over the past 20 years has provided oceanographers with information about the transport of metabolic energy and matter to the deep ocean. However, the interpretation of results is complicated by spatial variability in overlying waters. A new study uses Lagrangian analysis to investigate the characteristics of statistical funnels above a moored sediment trap array in the Sargasso Sea. A model of the trajectories that individual particles take before collection is also presented.

Published
1997

13. 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

14. Bone marrow transplantation corrects the enzyme defect in neurons of the central nervous system in lysosomal storage disease

Author

Walkley, S. U., Thrall, M.A., Dobrenis, K., Huang, M., March, P.A., Siegel, D.A., and Wurzelmann, S.

Subjects
Central nervous system -- Research, Bone marrow -- Transplantation, Science and technology
Abstract

Substantial levels of a missing lysosomal hydrolase within neurons of the central nervous system and compensation for the genetic metabolic fault may result from the use of bone marrow transplantation as treatment for a neuronal storage disease. Marginal or no advancement of neurologic signs are evident within 1-2 years following transplant in treated animals.

Published
1994

18. Influence of mesoscale eddies on new production in the Sargasso Sea

Author

McGillicuddy, D.J. Jr., Robinson, A.R., Siegel, D.A., Jannasch, H.W., Johnson, R., Dickey, T.D., McNeil, J., Michaels, A.F., and Knap, A.H.

Subjects
Sargasso Sea -- Research, Eddies -- Research, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

The idea that mesocale processes may be an important vehicle for nutrient transport has long been debated. A regional eddy-resolving model was used to build long-term aseasonal simulations characteristic of the mesocale environment in the Sargasso Sea. The results show that simulations are statistically realistic representations of mesoscale fluctuations. Results of the incorporation of a simple biological model into the calculations show that upwelling due to cyclonic eddy formation leads to sporadic nutrient injections into the surface layer.

Published
1998

19. A new time series of particle export from neutrally buoyant sediments traps at the Bermuda Atlantic Time-series Study site

Author

Siegel D.A, Michael W. Lomas, Deborah K. Steinberg, Ken O. Buesseler, S A Owens, Carl H. Lamborg, R.J. Johnson, and James R. Valdes

Subjects
Biogeochemical cycle, Bermuda Atlantic Time-series Study, Mixed layer, chemistry.chemical_element, Particle (ecology), Aquatic Science, Oceanography, Zooplankton, Geography, Flux (metallurgy), chemistry, Sediment trap, Carbon
Abstract

Neutrally buoyant sediment traps (NBSTs) were deployed concurrently with particle interceptor traps (PITs) on monthly cruises of the Bermuda Atlantic Time-series Study (BATS) from June 2007 to July 2010. In most months, particulate organic carbon flux measured by the two sediment trap systems agreed within the range of variability for two separate NBSTs. In three periods of this study however, the PITs collected more than three times the amount of particulate organic carbon (POC) than the NBSTs. One of these periods coincided with two instances when the mixed layer was deeper than the trap deployment depth, which may lead to biased collection. One of the anomalous periods occurred during summer months, for which we were unable to find existing evidence of biogeochemical changes that would lead to such increases in POC flux. The third anomalous period occurred when the POC flux measured by the NBSTs was near zero. We hypothesize that the PITs may have a positive bias at low fluxes relative to the NBSTs. Zooplankton swimmers accounted for 497 20% of the total measured carbon flux over the three year period and swimmer removal by screening of samples through a 350 mm mesh was established as an effective method for this site. Process blank corrections based on sample-identical blanks were important for determining mass and carbon flux from both the NBSTs and the PITs. This new record of particle export from NBSTs suggests that the observed carbon imbalance in this region of the ocean (Michaels et al., 1994) is not due to undersampling by the PITs and that export ratios may be even lower than previously thought.

Published
2013
Full Text
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20. 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
Full Text
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21. 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

22. VERTIGO (VERtical Transport in the Global Ocean): A study of particle sources and flux attenuation in the North Pacific

Author

Buesseler, K.O., Trull, T.W., Steinber, D.K., Silver, M.W., Siegel, D.A., Saitoh, S.I., Lamborg, C.H., Lam, P.J., Karl, D.M., Jiao, N.Z., Honda, M.C., Elskens, M., Dehairs, F., Brown, S.L., Boyd, P.W., Bishop, J.K.B., and Bidigare, R.R.

Abstract

The VERtical Transport In the Global Ocean (VERTIGO) study examined particle sources and fluxes through the ocean's "twilight zone" (defined here as depths below the euphoric zone to 1000m). Interdisciplinary process studies were conducted at contrasting sites off Hawaii (ALOHA) and in the NW Pacific (K2) during 3-week occupations in 2004 and 2005, respectively. We examine in this overview paper the contrasting physical. chemical and biological settings and how these conditions impact the source characteristics of the sinking material and the transport efficiency through the twilight zone. A major finding in VERTIGO is the considerably lower transfer efficiency (Teff) of particulate organic carbon (POC), POC flux 500/150 m, at ALOHA (20%) vs. K2 (50%). This efficiency is higher in the diatom-dominated setting at K2 where silica-rich particles dominate the flux at the end of a diatom bloom, and where zooplankton and their pellets are larger. At K2, the drawdown of macronutrients is used to assess export and suggests that shallow remineralization above our 150-m trap is significant, especially for N relative to Si. We explore here also surface export ratios (POC flux/primary production) and possible reasons why this ratio is higher at K2, especially during the first trap deployment. When we compare the 500-m fluxes to deep moored traps, both sites lose about half of the sinking POC by > 4000 m, but this comparison is limited in that fluxes at depth may have both a local and distant component. Certainly, the greatest difference in particle flux attenuation is in the mesopelagic, and we highlight other VERTIGO papers that provide a more detailed examination of the particle sources, flux and processes that attenuate the flux of sinking particles. Ultimately, we contend that at least three types of processes need to be considered: heterotrophic degradation of sinking particles, zooplankton migration and surface feeding, and lateral sources of suspended and sinking materials. We have evidence that all of these processes impacted the net attenuation of particle flux vs. depth measured in VERTIGO and would therefore need to be considered and quantified in order to understand the magnitude and efficiency of the ocean's biological pump.

Published
2008

23. Revisiting carbon flux through the ocean's twilight zone

Author

Buesseler, K.O., Lamborg, C.H., Boyd, P.W., Lam, P.J., Trull, T.W., Bidigare, R.R., Bishop, J.K.B., Casciotti, K.L., Dehairs, F.A., Elskens, M., Honda, M., Karl, D.M., Siegel, D.A., Silver, M.W., Steinberg, D.K., Valdes, J., Van Mooy, B.A.S., and Wilson, S.

Abstract

The oceanic biological pump drives sequestration of carbon dioxide in the deep sea via sinking particles. Rapid biological consumption and remineralization of carbon in the "twilight zone" (depths between the euphotic zone and 1000 meters) reduce the efficiency of sequestration. By using neutrally buoyant sediment traps to sample this chronically understudied realm, we measured a transfer efficiency of sinking particulate organic carbon between 150 and 500 meters of 20 and 50% at two contrasting sites. This large variability in transfer efficiency is poorly represented in biogeochemical models. If applied globally, this is equivalent to a difference in carbon sequestration of more than 3 petagrams of carbon per year.

Published
2007

24. Corrigendum to 'Trajectories of sinking particles in the Sargasso Sea: modeling of statistical funnels above deep-ocean sediment traps'

Author

Siegel, D.A. and Armstrong, R.A.

Subjects
Sargasso Sea -- Environmental aspects, Marine sediments -- Models, Sediment, Suspended -- Models, Earth sciences
Abstract

The article presents a recomputation of sinking particle trajectories in the Sargasso Sea. Sea surface particle origins were expressed as functions of sinking speed and trap depth. Adjustments made to original findings due to this recomputation are also discussed.

Published
2002

25. Determination of the surface structure of CeO2(111) by low-energy electron diffraction

Author

Siegel, D.A., Chueh, W.C., El Gabaly, Farid, McCarty, K.F., de la Figuera, Juan, Blanco-Rey, María, Siegel, D.A., Chueh, W.C., El Gabaly, Farid, McCarty, K.F., de la Figuera, Juan, and Blanco-Rey, María

Abstract

We determine the atomic structure of the (111) surface of an epitaxial ceria film using low-energy electron diffraction (LEED). The 3-fold-symmetric LEED patterns are consistent with a bulk-like termination of the (111) surface. By comparing the experimental dependence of diffraction intensity on electron energy (LEED-I(V) data) with simulations of dynamic scattering from different surface structures, we find that the CeO2(111) surface is terminated by a plane of oxygen atoms.We also find that the bond lengths in the top few surface layers of CeO2(111) are mostly undistorted from their bulk values, in general agreement with theoretical predictions. However, the topmost oxygen layer is further from the underlying cerium layer than the true bulk termination, an expansion that differs from theoretical predictions. © 2013 AIP Publishing LLC.

Published
2013

26. VERTIGO (VERtical Transport In the Global Ocean): A study of particle sources and flux attenuation in the North Pacific

Author

Buesseler, K.O., primary, Trull, T.W., additional, Steinberg, D.K., additional, Silver, M.W., additional, Siegel, D.A., additional, Saitoh, S.-I., additional, Lamborg, C.H., additional, Lam, P.J., additional, Karl, D.M., additional, Jiao, N.Z., additional, Honda, M.C., additional, Elskens, M., additional, Dehairs, F., additional, Brown, S.L., additional, Boyd, P.W., additional, Bishop, J.K.B., additional, and Bidigare, R.R., additional

Published
2008
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31. Bio-optical modeling of primary production on regional scales: the Bermuda BioOptics project

Author

Siegel, D.A, primary, Westberry, T.K, additional, O’Brien, M.C, additional, Nelson, N.B, additional, Michaels, A.F, additional, Morrison, J.R, additional, Scott, A, additional, Caporelli, E.A, additional, Sorensen, J.C, additional, Maritorena, S, additional, Garver, S.A, additional, Brody, E.A, additional, Ubante, J, additional, and Hammer, M.A, additional

Published
2001
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33. Spatial and temporal characteristics of sediment plumes and phytoplankton blooms in the Santa Barbara Channel

Author

Otero, M.P. and Siegel, D.A.

Subjects
*WATER pollution, *HYDROLOGIC cycle, *WASTE products, *RADIOMETERS
Abstract

Abstract: Satellite ocean-color and sea-surface temperature (SST) imagery are used to assess the occurrence, extent and duration of surface sediment plumes from discharged stormwaters and phytoplankton blooms in the Santa Barbara Channel (SBC), California. Nearly four years (October 1997–June 2001) of Advanced Very High Resolution Radiometer and Sea-viewing Wide Field-of-view Sensor local area coverage imagery, in situ measurements, and supporting data are analyzed. Monthly mean annual cycles of SST, chlorophyll (Chl) and the water-leaving radiance at 555nm (L wN(555)), an index for sediment-affected waters, show plumes associated with runoff in winter, while blooms occur in the late spring–early summer and are associated with cool SST and upwelling favorable winds. Interannual variations are consistent with remote forcing by El Niño cycles. During the 1997–1998 El Niño, Chl concentrations are moderate, and El Niño-induced floodwater discharges result in high L wN(555) values throughout the SBC. However, a correspondence between El Niño–La Niña state and Chl is not found for the SBC due to what appears to be the advection of nutrient-depleted waters from the east. Empirical plume and bloom indices show that plumes occur episodically in response to discharge events whereas blooms occur more regularly and can cover up to 95% of the SBC. Empirical orthogonal function analysis is used to spatially and temporally deconvolve processes regulating SST, Chl and L wN(555). The first Chl mode contains 43% of the temporal variance and is associated with wind-driven upwelling in spring and summer. The first L wN(555) mode contains 51% of the temporal variance and is associated with episodic terrestrial runoff events in February and March. The second modes for both Chl and L wN(555) represent the transition from runoff-dominated processes in winter to upwelling and bloom-dominated processes in summer. [Copyright &y& Elsevier]

Published
2004
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34. The spring bloom in the northwestern Sargasso Sea: spatial extent and relationship with winter mixing

Author

Nelson, N.B., Siegel, D.A., and Yoder, J.A.

Subjects
*REMOTE sensing, *AERIAL photogrammetry, *CHLOROPHYLL
Abstract

Abstract: The interannual variability of the spatial extent of the spring bloom in the central Sargasso Sea was quantified by remote-sensing approaches. Proxy measurements employing satellite-derived sea-surface temperature and chlorophyll a concentrations were used to estimate the amount of new production derived from inorganic nitrate supplied by convective winter mixing. Nitrate supply and new productivity were estimated from temperature–nitrate and chlorophyll a–euphotic-zone depth relationships derived from in situ measurements made at the US JGOFS Bermuda Atlantic Time-series Study (BATS) site near Bermuda (31°40′ N, 64°10′ W). Proxy estimates of springtime new production at the BATS latitude fall within the range of previous estimates from geochemical approaches, numerical modeling, and analysis of hydrographic measurements. However, estimates of new production made at BATS are poor predictors of the regional-scale new production due to large interannual differences in the spatial gradients of the controlling factors. Moreover, the BATS latitude is in a region of local maxima of meridional gradients in sea-surface temperature and thereby new production. The BATS site lies in a boundary region between the dynamic, spatially variable and productive northern Sargasso Sea and the spring-bloom-free region of the southern Sargasso. Hence, interpretations of spring bloom-forced regional scale biogeochemical processes from point observations made at BATS should be made with caution. [Copyright &y& Elsevier]

Published
2004
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