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7. A Quasi-Global Approach to Improve Day-Time Satellite Surface Soil Moisture Anomalies through the Land Surface Temperature Input

Author

Parinussa, Robert M, de Jeu, Richard A. M, van Der Schalie, Robin, Crow, Wade T, Lei, Fangni, and Holmes, Thomas R. H

Subjects
Earth Resources And Remote Sensing
Abstract

Passive microwave observations from various spaceborne sensors have been linked to the soil moisture of the Earth's surface layer. A new generation of passive microwave sensors are dedicated to retrieving this variable and make observations in the single theoretically optimal L-band frequency (1-2 GHz). Previous generations of passive microwave sensors made observations in a range of higher frequencies, allowing for simultaneous estimation of additional variables required for solving the radiative transfer equation. One of these additional variables is land surface temperature, which plays a unique role in the radiative transfer equation and has an influence on the final quality of retrieved soil moisture anomalies. This study presents an optimization procedure for soil moisture retrievals through a quasi-global precipitation-based verification technique, the so-called Rvalue metric. Various land surface temperature scenarios were evaluated in which biases were added to an existing linear regression, specifically focusing on improving the skills to capture the temporal variability of soil moisture. We focus on the relative quality of the day-time (01:30 pm) observations from the Advanced Microwave Scanning Radiometer for Earth Observing System (AMSR-E), as these are theoretically most challenging due to the thermal equilibrium theory, and existing studies indicate that larger improvements are possible for these observations compared to their night-time (01:30 am) equivalent. Soil moisture data used in this study were retrieved through the Land Parameter Retrieval Model (LPRM), and in line with theory, both satellite paths show a unique and distinct degradation as a function of vegetation density. Both the ascending (01:30 pm) and descending (01:30 am) paths of the publicly available and widely used AMSR-E LPRM soil moisture products were used for benchmarking purposes. Several scenarios were employed in which the land surface temperature input for the radiative transfer was varied by imposing a bias on an existing regression. These scenarios were evaluated through the Rvalue technique, resulting in optimal bias values on top of this regression. In a next step, these optimal bias values were incorporated in order to re-calibrate the existing linear regression, resulting in a quasi-global uniform LST relation for day-time observations. In a final step, day-time soil moisture retrievals using the re-calibrated land surface temperature relation were again validated through the Rvalue technique. Results indicate an average increasing Rvalue of 16.5%, which indicates a better performance obtained through the re-calibration. This number was confirmed through an independent Triple Collocation verification over the same domain, demonstrating an average root mean square error reduction of 15.3%. Furthermore, a comparison against an extensive in situ database (679 stations) also indicates a generally higher quality for the re-calibrated dataset. Besides the improved day-time dataset, this study furthermore provides insights on the relative quality of soil moisture retrieved from AMSR-E's day- and night-time observations.

Published
2016
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8. Evaluation of 18 satellite- and model-based soil moisture products using in situ measurements from 826 sensors

Author

Beck, Hylke E., primary, Pan, Ming, additional, Miralles, Diego G., additional, Reichle, Rolf H., additional, Dorigo, Wouter A., additional, Hahn, Sebastian, additional, Sheffield, Justin, additional, Karthikeyan, Lanka, additional, Balsamo, Gianpaolo, additional, Parinussa, Robert M., additional, van Dijk, Albert I. J. M., additional, Du, Jinyang, additional, Kimball, John S., additional, Vergopolan, Noemi, additional, and Wood, Eric F., additional

Published
2021
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10. Supplementary material to "Evaluation of 18 satellite- and model-based soil moisture products using in situ measurements from 826 sensors"

Author

Beck, Hylke E., primary, Pan, Ming, additional, Miralles, Diego G., additional, Reichle, Rolf H., additional, Dorigo, Wouter A., additional, Hahn, Sebastian, additional, Sheffield, Justin, additional, Karthikeyan, Lanka, additional, Balsamo, Gianpaolo, additional, Parinussa, Robert M., additional, van Dijk, Albert I. J. M., additional, Du, Jinyang, additional, Kimball, John S., additional, Vergopolan, Noemi, additional, and Wood, Eric F., additional

Published
2020
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11. Evaluation of 18 satellite- and model-based soil moisture products using in situ measurements from 826 sensors

Author

Beck, Hylke E., primary, Pan, Ming, additional, Miralles, Diego G., additional, Reichle, Rolf H., additional, Dorigo, Wouter A., additional, Hahn, Sebastian, additional, Sheffield, Justin, additional, Karthikeyan, Lanka, additional, Balsamo, Gianpaolo, additional, Parinussa, Robert M., additional, van Dijk, Albert I. J. M., additional, Du, Jinyang, additional, Kimball, John S., additional, Vergopolan, Noemi, additional, and Wood, Eric F., additional

Published
2020
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13. Evaluation of 18 satellite- and model-based soil moisture products using in situ measurements from 826 sensors.

Author

Beck, Hylke E., Ming Pan, Miralles, Diego G., Reichle, Rolf H., Dorigo, Wouter A., Hahn, Sebastian, Sheffield, Justin, Karthikeyan, Lanka, Balsamo, Gianpaolo, Parinussa, Robert M., van Dijk, Albert I. J. M., Jinyang Du, Kimball, John S., Vergopolan, Noemi, and Wood, Eric F.

Abstract

Information about the spatiotemporal variability of soil moisture is critical for many purposes, including monitoring of hydrologic extremes, irrigation scheduling, and prediction of agricultural yields. We evaluated the temporal dynamics of 18 state-of-the-art (quasi-)global near-surface soil moisture products, including six based on satellite retrievals, six based on models without satellite data assimilation (referred to hereafter as "open-loop" models), and six based on models that assimilate satellite soil moisture or brightness temperature data. Seven of the products are introduced for the first time in this study: one multi-sensor merged satellite product called MeMo and six estimates from the HBV model with three precipitation inputs (ERA5, IMERG, and MSWEP) and with and without assimilation of SMAPL3E satellite retrievals, respectively. As reference, we used in situ soil moisture measurements between 2015 and 2019 at 5-cm depth from 826 sensors, located primarily in the USA and Europe. The 3-hourly Pearson correlation (R) was chosen as the primary performance metric. The median R ± interquartile range across all sites and products in each category was 0.66±0.30 for the satellite products, 0.69±0.25 for the open-loop models, and 0.72±0.22 for the models with satellite data assimilation. The best-to-worst performance ranking of the four single-sensor satellite products was SMAPL3E, SMOS, AMSR2, and ASCAT, with the L-band-based SMAPL3E (median R of 0.72) outperforming the others at 50 % of the sites. Among the two multi-sensor satellite products (MeMo and ESA-CCI), MeMo performed better on average (median R of 0.72 versus 0.67), mainly due to the inclusion of SMAPL3E. The best-to-worst performance ranking of the six open-loop models was HBV-MSWEP, HBV-ERA5, ERA5-Land, HBV-IMERG, VIC-PGF, and GLDAS-Noah. This ranking largely reflects the quality of the precipitation forcing. HBV-MSWEP (median R of 0.78) performed best not just among the open-loop models but among all products. The calibration of HBV improved the median R by +0.12 on average compared to random parameters, highlighting the importance of model calibration. The best-to-worst performance ranking of the six models with satellite data assimilation was HBV-MSWEP+SMAPL3E, HBV-ERA5+SMAPL3E, GLEAM, SMAPL4, HBV-IMERG+SMAPL3E, and ERA5. The assimilation of SMAPL3E retrievals into HBV-IMERG improved the median R by +0.06, suggesting that data assimilation yields significant benefits at the global scale. [ABSTRACT FROM AUTHOR]

Published
2020
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16. State of the Climate in 2016

Author

Arndt, D. S., Blunden, J., Dunn, R. J. H., Aaron-morrison, Arlene P., Abdallah, A., Ackerman, Steven A., Adler, Robert, Alfaro, Eric J., Allan, Richard P., Allan, Rob, Alvarez, Luis A., Alves, Lincoln M., Amador, Jorge A., Andreassen, L. M., Arce, Dayana, Argueez, Anthony, Arndt, Derek S., Arzhanova, N. M., Augustine, John, Awatif, E. M., Azorin-molina, Cesar, Baez, Julian, Bardin, M. U., Barichivich, Jonathan, Baringer, Molly O., Barreira, Sandra, Baxter, Stephen, Beck, H. E., Becker, Andreas, Bedka, Kristopher M., Behrenfeld, Michael J., Bell, Gerald D., Belmont, M., Benedetti, Angela, Bernhard, G. H., Berrisford, Paul, Berry, David I., Bettolli, Maria L., Bhatt, U. S., Bidegain, Mario, Biskaborn, B., Bissolli, Peter, Bjerke, J., Blake, Eric S., Blunden, Jessica, Bosilovich, Michael G., Boucher, Olivier, Boudet, Dagne, Box, J. E., Boyer, Tim, Braathen, Geir O., Brimelow, Julian, Bromwich, David H., Brown, R., Buehler, S., Bulygina, Olga N., Burgess, D., Calderon, Blanca, Camargo, Suzana J., Campbell, Jayaka D., Cappelen, J., Caroff, P., Carrea, Laura, Carter, Brendan R., Chambers, Don P., Chandler, Elise, Cheng, Ming-dean, Christiansen, Hanne H., Christy, John R., Chung, Daniel, Chung, E. -s., Clem, Kyle R., Coelho, Caio A. S., Coldewey-egbers, Melanie, Colwell, Steve, Cooper, Owen R., Copland, L., Cross, J. N., Crouch, Jake, Cutie, Virgen, Davis, Sean M., De Eyto, Elvira, De Jeu, Richard A. M., De Laat, Jos, Degasperi, Curtis L., Degenstein, Doug, Demircan, M., Derksen, C., Di Girolamo, Larry, Diamond, Howard J., Dindyal, S., Dlugokencky, Ed J., Dohan, Kathleen, Dokulil, Martin T., Dolman, A. Johannes, Domingues, Catia M., Donat, Markus G., Dong, Shenfu, Dorigo, Wouter A., Drozdov, D. S., Dunn, Robert J. H., Duran-quesada, Ana M., Dutton, Geoff S., Elkharrim, M., Elkins, James W., Epstein, H. E., Espinoza, Jhan C., Etienne-leblanc, Sheryl, Famiglietti, James S., Farrell, S., Fateh, S., Fausto, R. S., Feely, Richard A., Feng, Z., Fenimore, Chris, Fettweis, X., Fioletov, Vitali E., Flannigan, Mike, Flemming, Johannes, Fogt, Ryan L., Folland, Chris, Fonseca, C., Forbes, B. C., Foster, Michael J., Francis, S. D., Franz, Bryan A., Frey, Richard A., Frith, Stacey M., Froidevaux, Lucien, Ganter, Catherine, Gerland, S., Gilson, John, Gobron, Nadine, Goldenberg, Stanley B., Goni, Gustavo, Gonzalez, Idelmis T., Goto, A., Greenhough, Marianna D., Grooss, J. -u., Gruber, Alexander, Guard, Charles, Gupta, S. K., Gutierrez, J. M., Haas, C., Hagos, S., Hahn, Sebastian, Haimberger, Leo, Hall, Brad D., Halpert, Michael S., Hamlington, Benjamin D., Hanna, E., Hanssen-bauer, I, Hare, Jon, Harris, Ian, Heidinger, Andrew K., Heim, Richard R., Jr., Hendricks, S., Hernandez, Marieta, Hernandez, Rafael, Hidalgo, Hugo G., Ho, Shu-peng, Hobbs, William R., Huang, Boyin, Huelsing, Hannah K., Hurst, Dale F., Ialongo, I., Ijampy, J. A., Inness, Antje, Isaksen, K., Ishii, Masayoshi, Jevrejeva, Svetlana, Jimenez, C., Jin Xiangze, John, Viju, Johns, William E., Johnsen, B., Johnson, Bryan, Johnson, Gregory C., Johnson, Kenneth S., Jones, Philip D., Jumaux, Guillaume, Kabidi, Khadija, Kaiser, J. W., Kass, David, Kato, Seiji, Kazemi, A., Kelem, G., Keller, Linda M., Kelly, B. P., Kendon, Mike, Kennedy, John, Kerr, Kenneth, Kholodov, A. L., Khoshkam, Mahbobeh, Killick, Rachel, Kim, Hyungjun, Kim, S. -j., Kimberlain, Todd B., Klotzbach, Philip J., Knaff, John A., Kochtubajda, Bob, Kohler, J., Korhonen, Johanna, Korshunova, Natalia N., Kramarova, Natalya, Kratz, D. P., Kruger, Andries, Kruk, Michael C., Krumpen, T., Lakatos, M., Lakkala, K., Lanckmann, J. -p., Lander, Mark A., Landschuetzer, Peter, Landsea, Chris W., Lankhorst, Matthias, Lantz, Kathleen, Lazzara, Matthew A., Leuliette, Eric, Lewis, Stephen R., L'Heureux, Michelle, Lieser, Jan L., Lin, I-i, Liu, Hongxing, Liu, Yinghui, Locarnini, Ricardo, Loeb, Norman G., Long, Craig S., Loranty, M., Lorrey, Andrew M., Loyola, Diego, Lu, Mong-ming, Lumpkin, Rick, Luo, Jing-jia, Luojus, K., Lyman, John M., Macara, Gregor, Macdonald, Alison M., Macias-fauria, M., Malkova, G. V., Manney, G., Marchenko, S. S., Marengo, Jose A., Marra, John J., Marszelewski, Wlodzimierz, Martens, B., Martinez-gueingla, Rodney, Massom, Robert A., Mathis, Jeremy T., May, Linda, Mayer, Michael, Mazloff, Matthew, Mcbride, Charlotte, Mccabe, M. F., Mccarthy, Gerard, Mccarthy, M., Mcdonagh, Elaine L., Mcgree, Simon, Mcvicar, Tim R., Mears, Carl A., Meier, W., Mekonnen, A., Menezes, V. V., Mengistu Tsidu, G., Menzel, W. Paul, Merchant, Christopher J., Meredith, Michael P., Merrifield, Mark A., Minnis, Patrick, Miralles, Diego G., Mistelbauer, T., Mitchum, Gary T., Mitro, Srkani, Monselesan, Didier, Montzka, Stephen A., Mora, Natalie, Morice, Colin, Morrow, Blair, Mote, T., Mudryk, L., Muehle, Jens, Mullan, A. Brett, Mueller, R., Nash, Eric R., Nerem, R. Steven, Newman, Louise, Newman, Paul A., Nieto, Juan Jose, Noetzli, Jeannette, O'Neel, S., Osborn, Tim J., Overland, J., Oyunjargal, Lamjav, Parinussa, Robert M., Park, E-hyung, Pasch, Richard J., Pascual-ramirez, Reynaldo, Paterson, Andrew M., Pearce, Petra R., Pellichero, Violaine, Pelto, Mauri S., Peng, Liang, Perkins-kirkpatrick, Sarah E., Perovich, D., Petropavlovskikh, Irina, Pezza, Alexandre B., Phillips, C., Phillips, David, Phoenix, G., Pinty, Bernard, Pitts, Michael C., Pons, M. R., Porter, Avalon O., Quintana, Juan, Rahimzadeh, Fatemeh, Rajeevan, Madhavan, Rayner, Darren, Raynolds, M. K., Razuvaev, Vyacheslav N., Read, Peter, Reagan, James, Reid, Phillip, Reimer, Christoph, Remy, Samuel, Renwick, James A., Revadekar, Jayashree V., Richter-menge, J., Rimmer, Alon, Robinson, David A., Rodell, Matthew, Rollenbeck, Ruetger, Romanovsky, Vladimir E., Ronchail, Josyane, Roquet, F., Rosenlof, Karen H., Roth, Chris, Rusak, James A., Sallee, Jean-bapiste, Sanchez-lugo, Ahira, Santee, Michelle L., Sarmiento, Jorge L., Sawaengphokhai, P., Sayouri, Amal, Scambos, Ted A., Schemm, Jae, Schladow, S. Geoffrey, Schmid, Claudia, Schmid, Martin, Schoeneich, P., Schreck, Carl J., Iii, Schuur, Ted, Selkirk, H. B., Send, Uwe, Sensoy, Serhat, Sharp, M., Shi, Lei, Shiklomanov, Nikolai I., Shimaraeva, Svetlana V., Siegel, David A., Signorini, Sergio R., Silov, Eugene, Sima, Fatou, Simmons, Adrian J., Smeed, David A., Smeets, C. J. P. P., Smith, Adam, Smith, Sharon L., Soden, B., Spence, Jaqueline M., Srivastava, A. K., Stackhouse, Paul W., Jr., Stammerjohn, Sharon, Steinbrecht, Wolfgang, Stella, Jose L., Stennett-brown, Roxann, Stephenson, Tannecia S., Strahan, Susan, Streletskiy, Dimitri A., Sun-mack, Sunny, Swart, Sebastiaan, Sweet, William, Tamar, Gerard, Taylor, Michael A., Tedesco, M., Thoman, R. L., Thompson, L., Thompson, Philip R., Timmermans, M. -l., Timofeev, Maxim A., Tirnanes, Joaquin A., Tobin, Skie, Trachte, Katja, Trewin, Blair C., Trotman, Adrian R., Tschudi, M., Tweedy, Olga, Van As, D., Van De Wal, R. S. W., Van Der Schalie, Robin, Van Der Schrier, Gerard, Van Der Werf, Guido R., Van Meerbeeck, Cedric J., Velicogna, I., Verburg, Piet, Vieira, G., Vincent, Lucie A., Voemel, Holger, Vose, Russell S., Wagner, Wolfgang, Wahlin, Anna, Walker, D. A., Walsh, J., Wang, Bin, Wang, Chunzai, Wang, Junhong, Wang, Lei, Wang, M., Wang, Sheng-hung, Wanninkhof, Rik, Watanabe, Shohei, Weber, Mark, Weller, Robert A., Weyhenmeyer, Gesa A., Whitewood, Robert, Wiese, David N., Wijffels, Susan E., Wilber, Anne C., Wild, Jeanette D., Willett, Kate M., Willie, Shem, Willis, Josh K., Wolken, G., Wong, Takmeng, Wood, E. F., Woolway, R. Iestyn, Wouters, B., Xue, Yan, Yim, So-young, Yin, Xungang, Yu, Lisan, Zambrano, Eduardo, Zhang, Huai-min, Zhang, Peiqun, Zhao, Guanguo, Zhao, Lin, Ziemke, Jerry R., Zilberman, Nathalie, Arndt, D. S., Blunden, J., Dunn, R. J. H., Aaron-morrison, Arlene P., Abdallah, A., Ackerman, Steven A., Adler, Robert, Alfaro, Eric J., Allan, Richard P., Allan, Rob, Alvarez, Luis A., Alves, Lincoln M., Amador, Jorge A., Andreassen, L. M., Arce, Dayana, Argueez, Anthony, Arndt, Derek S., Arzhanova, N. M., Augustine, John, Awatif, E. M., Azorin-molina, Cesar, Baez, Julian, Bardin, M. U., Barichivich, Jonathan, Baringer, Molly O., Barreira, Sandra, Baxter, Stephen, Beck, H. E., Becker, Andreas, Bedka, Kristopher M., Behrenfeld, Michael J., Bell, Gerald D., Belmont, M., Benedetti, Angela, Bernhard, G. H., Berrisford, Paul, Berry, David I., Bettolli, Maria L., Bhatt, U. S., Bidegain, Mario, Biskaborn, B., Bissolli, Peter, Bjerke, J., Blake, Eric S., Blunden, Jessica, Bosilovich, Michael G., Boucher, Olivier, Boudet, Dagne, Box, J. E., Boyer, Tim, Braathen, Geir O., Brimelow, Julian, Bromwich, David H., Brown, R., Buehler, S., Bulygina, Olga N., Burgess, D., Calderon, Blanca, Camargo, Suzana J., Campbell, Jayaka D., Cappelen, J., Caroff, P., Carrea, Laura, Carter, Brendan R., Chambers, Don P., Chandler, Elise, Cheng, Ming-dean, Christiansen, Hanne H., Christy, John R., Chung, Daniel, Chung, E. -s., Clem, Kyle R., Coelho, Caio A. S., Coldewey-egbers, Melanie, Colwell, Steve, Cooper, Owen R., Copland, L., Cross, J. N., Crouch, Jake, Cutie, Virgen, Davis, Sean M., De Eyto, Elvira, De Jeu, Richard A. M., De Laat, Jos, Degasperi, Curtis L., Degenstein, Doug, Demircan, M., Derksen, C., Di Girolamo, Larry, Diamond, Howard J., Dindyal, S., Dlugokencky, Ed J., Dohan, Kathleen, Dokulil, Martin T., Dolman, A. Johannes, Domingues, Catia M., Donat, Markus G., Dong, Shenfu, Dorigo, Wouter A., Drozdov, D. S., Dunn, Robert J. H., Duran-quesada, Ana M., Dutton, Geoff S., Elkharrim, M., Elkins, James W., Epstein, H. E., Espinoza, Jhan C., Etienne-leblanc, Sheryl, Famiglietti, James S., Farrell, S., Fateh, S., Fausto, R. S., Feely, Richard A., Feng, Z., Fenimore, Chris, Fettweis, X., Fioletov, Vitali E., Flannigan, Mike, Flemming, Johannes, Fogt, Ryan L., Folland, Chris, Fonseca, C., Forbes, B. C., Foster, Michael J., Francis, S. D., Franz, Bryan A., Frey, Richard A., Frith, Stacey M., Froidevaux, Lucien, Ganter, Catherine, Gerland, S., Gilson, John, Gobron, Nadine, Goldenberg, Stanley B., Goni, Gustavo, Gonzalez, Idelmis T., Goto, A., Greenhough, Marianna D., Grooss, J. -u., Gruber, Alexander, Guard, Charles, Gupta, S. K., Gutierrez, J. M., Haas, C., Hagos, S., Hahn, Sebastian, Haimberger, Leo, Hall, Brad D., Halpert, Michael S., Hamlington, Benjamin D., Hanna, E., Hanssen-bauer, I, Hare, Jon, Harris, Ian, Heidinger, Andrew K., Heim, Richard R., Jr., Hendricks, S., Hernandez, Marieta, Hernandez, Rafael, Hidalgo, Hugo G., Ho, Shu-peng, Hobbs, William R., Huang, Boyin, Huelsing, Hannah K., Hurst, Dale F., Ialongo, I., Ijampy, J. A., Inness, Antje, Isaksen, K., Ishii, Masayoshi, Jevrejeva, Svetlana, Jimenez, C., Jin Xiangze, John, Viju, Johns, William E., Johnsen, B., Johnson, Bryan, Johnson, Gregory C., Johnson, Kenneth S., Jones, Philip D., Jumaux, Guillaume, Kabidi, Khadija, Kaiser, J. W., Kass, David, Kato, Seiji, Kazemi, A., Kelem, G., Keller, Linda M., Kelly, B. P., Kendon, Mike, Kennedy, John, Kerr, Kenneth, Kholodov, A. L., Khoshkam, Mahbobeh, Killick, Rachel, Kim, Hyungjun, Kim, S. -j., Kimberlain, Todd B., Klotzbach, Philip J., Knaff, John A., Kochtubajda, Bob, Kohler, J., Korhonen, Johanna, Korshunova, Natalia N., Kramarova, Natalya, Kratz, D. P., Kruger, Andries, Kruk, Michael C., Krumpen, T., Lakatos, M., Lakkala, K., Lanckmann, J. -p., Lander, Mark A., Landschuetzer, Peter, Landsea, Chris W., Lankhorst, Matthias, Lantz, Kathleen, Lazzara, Matthew A., Leuliette, Eric, Lewis, Stephen R., L'Heureux, Michelle, Lieser, Jan L., Lin, I-i, Liu, Hongxing, Liu, Yinghui, Locarnini, Ricardo, Loeb, Norman G., Long, Craig S., Loranty, M., Lorrey, Andrew M., Loyola, Diego, Lu, Mong-ming, Lumpkin, Rick, Luo, Jing-jia, Luojus, K., Lyman, John M., Macara, Gregor, Macdonald, Alison M., Macias-fauria, M., Malkova, G. V., Manney, G., Marchenko, S. S., Marengo, Jose A., Marra, John J., Marszelewski, Wlodzimierz, Martens, B., Martinez-gueingla, Rodney, Massom, Robert A., Mathis, Jeremy T., May, Linda, Mayer, Michael, Mazloff, Matthew, Mcbride, Charlotte, Mccabe, M. F., Mccarthy, Gerard, Mccarthy, M., Mcdonagh, Elaine L., Mcgree, Simon, Mcvicar, Tim R., Mears, Carl A., Meier, W., Mekonnen, A., Menezes, V. V., Mengistu Tsidu, G., Menzel, W. Paul, Merchant, Christopher J., Meredith, Michael P., Merrifield, Mark A., Minnis, Patrick, Miralles, Diego G., Mistelbauer, T., Mitchum, Gary T., Mitro, Srkani, Monselesan, Didier, Montzka, Stephen A., Mora, Natalie, Morice, Colin, Morrow, Blair, Mote, T., Mudryk, L., Muehle, Jens, Mullan, A. Brett, Mueller, R., Nash, Eric R., Nerem, R. Steven, Newman, Louise, Newman, Paul A., Nieto, Juan Jose, Noetzli, Jeannette, O'Neel, S., Osborn, Tim J., Overland, J., Oyunjargal, Lamjav, Parinussa, Robert M., Park, E-hyung, Pasch, Richard J., Pascual-ramirez, Reynaldo, Paterson, Andrew M., Pearce, Petra R., Pellichero, Violaine, Pelto, Mauri S., Peng, Liang, Perkins-kirkpatrick, Sarah E., Perovich, D., Petropavlovskikh, Irina, Pezza, Alexandre B., Phillips, C., Phillips, David, Phoenix, G., Pinty, Bernard, Pitts, Michael C., Pons, M. R., Porter, Avalon O., Quintana, Juan, Rahimzadeh, Fatemeh, Rajeevan, Madhavan, Rayner, Darren, Raynolds, M. K., Razuvaev, Vyacheslav N., Read, Peter, Reagan, James, Reid, Phillip, Reimer, Christoph, Remy, Samuel, Renwick, James A., Revadekar, Jayashree V., Richter-menge, J., Rimmer, Alon, Robinson, David A., Rodell, Matthew, Rollenbeck, Ruetger, Romanovsky, Vladimir E., Ronchail, Josyane, Roquet, F., Rosenlof, Karen H., Roth, Chris, Rusak, James A., Sallee, Jean-bapiste, Sanchez-lugo, Ahira, Santee, Michelle L., Sarmiento, Jorge L., Sawaengphokhai, P., Sayouri, Amal, Scambos, Ted A., Schemm, Jae, Schladow, S. Geoffrey, Schmid, Claudia, Schmid, Martin, Schoeneich, P., Schreck, Carl J., Iii, Schuur, Ted, Selkirk, H. B., Send, Uwe, Sensoy, Serhat, Sharp, M., Shi, Lei, Shiklomanov, Nikolai I., Shimaraeva, Svetlana V., Siegel, David A., Signorini, Sergio R., Silov, Eugene, Sima, Fatou, Simmons, Adrian J., Smeed, David A., Smeets, C. J. P. P., Smith, Adam, Smith, Sharon L., Soden, B., Spence, Jaqueline M., Srivastava, A. K., Stackhouse, Paul W., Jr., Stammerjohn, Sharon, Steinbrecht, Wolfgang, Stella, Jose L., Stennett-brown, Roxann, Stephenson, Tannecia S., Strahan, Susan, Streletskiy, Dimitri A., Sun-mack, Sunny, Swart, Sebastiaan, Sweet, William, Tamar, Gerard, Taylor, Michael A., Tedesco, M., Thoman, R. L., Thompson, L., Thompson, Philip R., Timmermans, M. -l., Timofeev, Maxim A., Tirnanes, Joaquin A., Tobin, Skie, Trachte, Katja, Trewin, Blair C., Trotman, Adrian R., Tschudi, M., Tweedy, Olga, Van As, D., Van De Wal, R. S. W., Van Der Schalie, Robin, Van Der Schrier, Gerard, Van Der Werf, Guido R., Van Meerbeeck, Cedric J., Velicogna, I., Verburg, Piet, Vieira, G., Vincent, Lucie A., Voemel, Holger, Vose, Russell S., Wagner, Wolfgang, Wahlin, Anna, Walker, D. A., Walsh, J., Wang, Bin, Wang, Chunzai, Wang, Junhong, Wang, Lei, Wang, M., Wang, Sheng-hung, Wanninkhof, Rik, Watanabe, Shohei, Weber, Mark, Weller, Robert A., Weyhenmeyer, Gesa A., Whitewood, Robert, Wiese, David N., Wijffels, Susan E., Wilber, Anne C., Wild, Jeanette D., Willett, Kate M., Willie, Shem, Willis, Josh K., Wolken, G., Wong, Takmeng, Wood, E. F., Woolway, R. Iestyn, Wouters, B., Xue, Yan, Yim, So-young, Yin, Xungang, Yu, Lisan, Zambrano, Eduardo, Zhang, Huai-min, Zhang, Peiqun, Zhao, Guanguo, Zhao, Lin, Ziemke, Jerry R., and Zilberman, Nathalie

Abstract

In 2016, the dominant greenhouse gases released into Earth's atmosphere-carbon dioxide, methane, and nitrous oxide-continued to increase and reach new record highs. The 3.5 +/- 0.1 ppm rise in global annual mean carbon dioxide from 2015 to 2016 was the largest annual increase observed in the 58-year measurement record. The annual global average carbon dioxide concentration at Earth's surface surpassed 400 ppm (402.9 +/- 0.1 ppm) for the first time in the modern atmospheric measurement record and in ice core records dating back as far as 800000 years. One of the strongest El Nino events since at least 1950 dissipated in spring, and a weak La Nina evolved later in the year. Owing at least in part to the combination of El Nino conditions early in the year and a long-term upward trend, Earth's surface observed record warmth for a third consecutive year, albeit by a much slimmer margin than by which that record was set in 2015. Above Earth's surface, the annual lower troposphere temperature was record high according to all datasets analyzed, while the lower stratospheric temperature was record low according to most of the in situ and satellite datasets. Several countries, including Mexico and India, reported record high annual temperatures while many others observed near-record highs. A week-long heat wave at the end of April over the northern and eastern Indian peninsula, with temperatures surpassing 44 degrees C, contributed to a water crisis for 330 million people and to 300 fatalities. In the Arctic the 2016 land surface temperature was 2.0 degrees C above the 1981-2010 average, breaking the previous record of 2007, 2011, and 2015 by 0.8 degrees C, representing a 3.5 degrees C increase since the record began in 1900. The increasing temperatures have led to decreasing Arctic sea ice extent and thickness. On 24 March, the sea ice extent at the end of the growth season saw its lowest maximum in the 37-year satellite record, tying with 2015 at 7.2% below the 1981-2010 av

Published
2017
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17. State of the Climate in 2014

Author

Aaron-Morrison, Arlene P., Ackerman, Steven A., Adams, Nicolaus G., Adler, Robert F., Albanil, Adelina, Alfaro, E. J., Allan, Rob, Alves, Lincoln M., Amador, Jorge A., Andreassen, L. M., Arendt, A., Arévalo, Juan, Arndt, Derek S., Arzhanova, N. M., Aschan, M. M., Azorin-Molina, César, Banzon, Viva, Bardin, M. U., Barichivich, Jonathan, Baringer, Molly O., Barreira, Sandra, Baxter, Stephen, Bazo, Juan, Becker, Andreas, Bedka, Kristopher M., Behrenfeld, Michael J., Bell, Gerald D., Belmont, M., Benedetti, Angela, Bernhard, G., Berrisford, Paul, Berry, David I., Bettolli, María L., Bhatt, U. S., Bidegain, Mario, Bill, Brian D., Billheimer, Sam, Bissolli, Peter, Blake, Eric S., Blunden, Jessica, Bosilovich, Michael G., Boucher, Olivier, Boudet, Dagne, Box, J. E., Boyer, Tim, Braathen, Geir O., Bromwich, David H., Brown, R., Bulygina, Olga N., Burgess, D., Calderón, Blanca, Camargo, Suzana J., Campbell, Jayaka D., Cappelen, J., Carrasco, Gualberto, Carter, Brendan R., Chambers, Don P., Chandler, Elise, Christiansen, Hanne H., Christy, John R., Chung, Daniel, Chung, E. S., Cinque, Kathy, Clem, Kyle R., Coelho, Caio A., Cogley, J. G., Coldewey-Egbers, Melanie, Colwell, Steve, Cooper, Owen R., Copland, L., Cosca, Catherine E., Cross, Jessica N., Crotwell, Molly J., Crouch, Jake, Davis, Sean M., De Eyto, Elvira, De Jeu, Richard A.M., De Laat, Jos, Degasperi, Curtis L., Degenstein, Doug, Demircan, M., Derksen, C., Destin, Dale, Di Girolamo, Larry, Di Giuseppe, F., Diamond, Howard J., Dlugokencky, Ed J., Dohan, Kathleen, Dokulil, Martin T., Dolgov, A. V., Dolman, A. Johannes, Domingues, Catia M., Donat, Markus G., Dong, Shenfu, Dorigo, Wouter A., Dortch, Quay, Doucette, Greg, Drozdov, D. S., Ducklow, Hugh, Dunn, Robert J.H., Durán-Quesada, Ana M., Dutton, Geoff S., Ebrahim, A., Elkharrim, M., Elkins, James W., Espinoza, Jhan C., Etienne-Leblanc, Sheryl, Evans, Thomas E., Famiglietti, James S., Farrell, S., Fateh, S., Fausto, Robert S., Fedaeff, Nava, Feely, Richard A., Feng, Z., Fenimore, Chris, Fettweis, X., Fioletov, Vitali E., Flemming, Johannes, Fogarty, Chris T., Fogt, Ryan L., Folland, Chris, Fonseca, C., Fossheim, M., Foster, Michael J., Fountain, Andrew, Francis, S. D., Franz, Bryan A., Frey, Richard A., Frith, Stacey M., Froidevaux, Lucien, Ganter, Catherine, Garzoli, Silvia, Gerland, S., Gobron, Nadine, Goldenberg, Stanley B., Gomez, R. Sorbonne, Goni, Gustavo, Goto, A., Grooß, J. U., Gruber, Alexander, Guard, Charles Chip, Gugliemin, Mauro, Gupta, S. K., Gutiérrez, J. M., Hagos, S., Hahn, Sebastian, Haimberger, Leo, Hakkarainen, J., Hall, Brad D., Halpert, Michael S., Hamlington, Benjamin D., Hanna, E., Hansen, K., Hanssen-Bauer, I., Harris, Ian, Heidinger, Andrew K., Heikkilä, A., Heil, A., Heim, Richard R., Hendricks, S., Hernández, Marieta, Hidalgo, Hugo G., Hilburn, Kyle, Ho, Shu Peng Ben, Holmes, R. M., Hu, Zeng Zhen, Huang, Boyin, Huelsing, Hannah K., Huffman, George J., Hughes, C., Hurst, Dale F., Ialongo, I., Ijampy, J. A., Ingvaldsen, R. B., Inness, Antje, Isaksen, K., Ishii, Masayoshi, Jevrejeva, Svetlana, Jiménez, C., Jin, Xiangze, Johannesen, E., John, Viju, Johnsen, B., Johnson, Bryan, Johnson, Gregory C., Jones, Philip D., Joseph, Annie C., Jumaux, Guillaume, Kabidi, Khadija, Kaiser, Johannes W., Kato, Seiji, Kazemi, A., Keller, Linda M., Kendon, Mike, Kennedy, John, Kerr, Kenneth, Kholodov, A. L., Khoshkam, Mahbobeh, Killick, Rachel, Kim, Hyungjun, Kim, S. J., Kimberlain, Todd B., Klotzbach, Philip J., Knaff, John A., Kobayashi, Shinya, Kohler, J., Korhonen, Johanna, Korshunova, Natalia N., Kovacs, K. M., Kramarova, Natalya, Kratz, D. P., Kruger, Andries, Kruk, Michael C., Kudela, Raphael, Kumar, Arun, Lakatos, M., Lakkala, K., Lander, Mark A., Landsea, Chris W., Lankhorst, Matthias, Lantz, Kathleen, Lazzara, Matthew A., Lemons, P., Leuliette, Eric, L’Heureux, Michelle, Lieser, Jan L., Lin, I. I., Liu, Hongxing, Liu, Yinghui, Locarnini, Ricardo, Loeb, Norman G., Lo Monaco, Claire, Long, Craig S., López Álvarez, Luis Alfonso, Lorrey, Andrew M., Loyola, Diego, Lumpkin, Rick, Luo, Jing Jia, Luojus, K., Lydersen, C., Lyman, John M., Maberly, Stephen C., Maddux, Brent C., Malheiros Ramos, Andrea, Malkova, G. V., Manney, G., Marcellin, Vernie, Marchenko, S. S., Marengo, José A., Marra, John J., Marszelewski, Wlodzimierz, Martens, B., Martínez-Güingla, Rodney, Massom, Robert A., Mata, Mauricio M., Mathis, Jeremy T., May, Linda, Mayer, Michael, Mazloff, Matthew, McBride, Charlotte, McCabe, M. F., McCarthy, M., McClelland, J. W., McGree, Simon, McVicar, Tim R., Mears, Carl A., Meier, W., Meinen, Christopher S., Mekonnen, A., Menéndez, Melisa, Mengistu Tsidu, G., Menzel, W. Paul, Merchant, Christopher J., Meredith, Michael P., Merrifield, Mark A., Metzl, N., Minnis, Patrick, Miralles, Diego G., Mistelbauer, T., Mitchum, Gary T., Monselesan, Didier, Monteiro, Pedro, Montzka, Stephen A., Morice, Colin, Mote, T., Mudryk, L., Mühle, Jens, Mullan, A. Brett, Nash, Eric R., Naveira-Garabato, Alberto C., Nerem, R. Steven, Newman, Paul A., Nieto, Juan José, Noetzli, Jeannette, O’Neel, S., Osborn, Tim J., Overland, J., Oyunjargal, Lamjav, Parinussa, Robert M., Park, E. Hyung, Parker, David, Parrington, M., Parsons, A. Rost, Pasch, Richard J., Pascual-Ramírez, Reynaldo, Paterson, Andrew M., Paulik, Christoph, Pearce, Petra R., Pelto, Mauri S., Peng, Liang, Perkins-Kirkpatrick, Sarah E., Perovich, D., Petropavlovskikh, Irina, Pezza, Alexandre B., Phillips, David, Pinty, Bernard, Pitts, Michael C., Pons, M. R., Porter, Avalon O., Primicerio, R., Proshutinsky, A., Quegan, Sean, Quintana, Juan, Rahimzadeh, Fatemeh, Rajeevan, Madhavan, Randriamarolaza, L., Razuvaev, Vyacheslav N., Reagan, James, Reid, Phillip, Reimer, Christoph, Rémy, Samuel, Renwick, James A., Revadekar, Jayashree V., Richter-Menge, J., Riffler, Michael, Rimmer, Alon, Rintoul, Steve, Robinson, David A., Rodell, Matthew, Rodríguez Solís, José L., Romanovsky, Vladimir E., Ronchail, Josyane, Rosenlof, Karen H., Roth, Chris, Rusak, James A., Sabine, Christopher L., Sallée, Jean Bapiste, Sánchez-Lugo, Ahira, Santee, Michelle L., Sawaengphokhai, P., Sayouri, Amal, Scambos, Ted A., Schemm, Jae, Schladow, S. Geoffrey, Schmid, Claudia, Schmid, Martin, Schmidtko, Sunke, Schreck, Carl J., Selkirk, H. B., Send, Uwe, Sensoy, Serhat, Setzer, Alberto, Sharp, M., Shaw, Adrian, Shi, Lei, Shiklomanov, A. I., Shiklomanov, Nikolai I., Siegel, David A., Signorini, Sergio R., Sima, Fatou, Simmons, Adrian J., Smeets, C. J.P.P., Smith, Sharon L., Spence, Jaqueline M., Srivastava, A. K., Stackhouse, Paul W., Stammerjohn, Sharon, Steinbrecht, Wolfgang, Stella, José L., Stengel, Martin, Stennett-Brown, Roxann, Stephenson, Tannecia S., Strahan, Susan, Streletskiy, D. A., Sun-Mack, Sunny, Swart, Sebastiaan, Sweet, William, Talley, Lynne D., Tamar, Gerard, Tank, S. E., Taylor, Michael A., Tedesco, M., Teubner, Katrin, Thoman, R. L., Thompson, Philip, Thomson, L., Timmermans, M. L., Tirnanes, Joaquin A., Tobin, Skie, Trachte, Katja, Trainer, Vera L., Tretiakov, M., Trewin, Blair C., Trotman, Adrian R., Tschudi, M., Van As, D., Van De Wal, R. S.W., van der A., Ronald J., Van Der Schalie, Robin, Van Der Schrier, Gerard, Van Der Werf, Guido R., Van Meerbeeck, Cedric J., Velicogna, I., Verburg, Piet, Vigneswaran, Bala, Vincent, Lucie A., Volkov, Denis, Vose, Russell S., Wagner, Wolfgang, Wåhlin, Anna, Wahr, J., Walsh, J., Wang, Chunzai, Wang, Junhong, Wang, Lei, Wang, M., Wang, Sheng Hung, Wanninkhof, Rik, Watanabe, Shohei, Weber, Mark, Weller, Robert A., Weyhenmeyer, Gesa A., Whitewood, Robert, Wijffels, Susan E., Wilber, Anne C., Wild, Jeanette D., Willett, Kate M., Williams, Michael J.M., Willie, Shem, Wolken, G., Wong, Takmeng, Wood, E. F., Woolway, R. Iestyn, Wouters, B., Xue, Yan, Yamada, Ryuji, Yim, So Young, Yin, Xungang, Young, Steven H., Yu, Lisan, Zahid, H., Zambrano, Eduardo, Zhang, Peiqun, Zhao, Guanguo, Zhou, Lin, Ziemke, Jerry R., Love-Brotak, S. Elizabeth, Gilbert, Kristin, Maycock, Tom, Osborne, Susan, Sprain, Mara, Veasey, Sara W., Ambrose, Barbara J., Griffin, Jessicca, Misch, Deborah J., Riddle, Deborah B., Young, Teresa, Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), ICOS-ATC (ICOS-ATC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Modélisation INVerse pour les mesures atmosphériques et SATellitaires (SATINV), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Earth and Climate

Subjects
0106 biological sciences, [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Atmospheric Science, 010504 meteorology & atmospheric sciences, 010604 marine biology & hydrobiology, Perspective (graphical), 15. Life on land, 01 natural sciences, El Niño Southern Oscillation, 13. Climate action, Climatology, SDG 13 - Climate Action, Environmental science, SDG 14 - Life Below Water, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, ComputingMilieux_MISCELLANEOUS, 0105 earth and related environmental sciences
Abstract

Most of the dozens of essential climate variables monitored each year in this report continued to follow their long-term trends in 2014, with several setting new records. Carbon dioxide, methane, and nitrous oxide-the major greenhouse gases released into Earth's atmosphere-once again all reached record high average atmospheric concentrations for the year. Carbon dioxide increased by 1.9 ppm to reach a globally averaged value of 397.2 ppm for 2014. Altogether, 5 major and 15 minor greenhouse gases contributed 2.94 W m-2 of direct radiative forcing, which is 36% greater than their contributions just a quarter century ago. Accompanying the record-high greenhouse gas concentrations was nominally the highest annual global surface temperature in at least 135 years of modern record keeping, according to four independent observational analyses. The warmth was distributed widely around the globe's land areas, Europe observed its warmest year on record by a large margin, with close to two dozen countries breaking their previous national temperature records; many countries in Asia had annual temperatures among their 10 warmest on record; Africa reported above-average temperatures across most of the continent throughout 2014; Australia saw its third warmest year on record, following record heat there in 2013; Mexico had its warmest year on record; and Argentina and Uruguay each had their second warmest year on record. Eastern North America was the only major region to observe a below-average annual temperature. But it was the oceans that drove the record global surface temperature in 2014. Although 2014 was largely ENSO-neutral, the globally averaged sea surface temperature (SST) was the highest on record. The warmth was particularly notable in the North Pacific Ocean where SST anomalies signaled a transition from a negative to positive phase of the Pacific decadal oscillation. In the winter of 2013/14, unusually warm water in the northeast Pacific was associated with elevated ocean heat content anomalies and elevated sea level in the region. Globally, upper ocean heat content was record high for the year, reflecting the continued increase of thermal energy in the oceans, which absorb over 90% of Earth's excess heat from greenhouse gas forcing. Owing to both ocean warming and land ice melt contributions, global mean sea level in 2014 was also record high and 67 mm greater than the 1993 annual mean, when satellite altimetry measurements began. Sea surface salinity trends over the past decade indicate that salty regions grew saltier while fresh regions became fresher, suggestive of an increased hydrological cycle over the ocean expected with global warming. As in previous years, these patterns are reflected in 2014 subsurface salinity anomalies as well. With a now decade-long trans-basin instrument array along 26°N, the Atlantic meridional overturning circulation shows a decrease in transport of-4.2 ± 2.5 Sv decade-1. Precipitation was quite variable across the globe. On balance, precipitation over the world's oceans was above average, while below average across land surfaces. Drought continued in southeastern Brazil and the western United States. Heavy rain during April-June led to devastating floods in Canada's Eastern Prairies. Above-normal summer monsoon rainfall was observed over the southern coast of West Africa, while drier conditions prevailed over the eastern Sahel. Generally, summer monsoon rainfall over eastern Africa was above normal, except in parts of western South Sudan and Ethiopia. The south Asian summer monsoon in India was below normal, with June record dry. Across the major tropical cyclone basins, 91 named storms were observed during 2014, above the 1981-2010 global average of 82. The Eastern/Central Pacific and South Indian Ocean basins experienced significantly above-normal activity in 2014; all other basins were either at or below normal. The 22 named storms in the Eastern/Central Pacific was the basin's most since 1992. Similar to 2013, the North Atlantic season was quieter than most years of the last two decades with respect to the number of storms, despite the absence of El Niño conditions during both years. In higher latitudes and at higher elevations, increased warming continued to be visible in the decline of glacier mass balance, increasing permafrost temperatures, and a deeper thawing layer in seasonally frozen soil. In the Arctic, the 2014 temperature over land areas was the fourth highest in the 115-year period of record and snow melt occurred 20-30 days earlier than the 1998-2010 average. The Greenland Ice Sheet experienced extensive melting in summer 2014. The extent of melting was above the 1981-2010 average for 90% of the melt season, contributing to the second lowest average summer albedo over Greenland since observations began in 2000 and a record-low albedo across the ice sheet for August. On the North Slope of Alaska, new record high temperatures at 20-m depth were measured at four of five permafrost observatories. In September, Arctic minimum sea ice extent was the sixth lowest since satellite records began in 1979. The eight lowest sea ice extents during this period have occurred in the last eight years. Conversely, in the Antarctic, sea ice extent countered its declining trend and set several new records in 2014, including record high monthly mean sea ice extent each month from April to November. On 20 September, a record large daily Antarctic sea ice extent of 20.14 × 106 km2 occurred. The 2014 Antarctic stratospheric ozone hole was 20.9 million km2 when averaged from 7 September to 13 October, the sixth smallest on record and continuing a decrease, albeit statistically insignificant, in area since 1998.

Published
2015
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19. State of the Climate in 2012

Author

Blunden, Jessica, Arndt, Derek S., Achberger, Christine, Ackerman, Stephen A., Albanil, Adelina, Alexander, P., Alfaro, Eric J., Allan, Rob, Alves, Lincoln M., Amador, Jorge A., Ambenje, Peter, Andrianjafinirina, Solonomenjanahary, Antonov, John, Aravequia, Jose A., Arendt, A., Arevalo, Juan, Ashik, I., Atheru, Zachary, Banzon, Viva, Baringer, Molly O., Barreira, Sandra, Barriopedro, David E., Beard, Grant, Becker, Andreas, Behrenfeld, Michael J., Bell, Gerald D., Benedetti, Angela, Bernhard, Germar, Berrisford, Paul, Berry, David I., Bhatt, U., Bidegain, Mario, Bindoff, Nathan, Bissolli, Peter, Blake, Eric S., Booneeady, Raj, Bosilovich, Michael, Box, J. E., Boyer, Tim, Braathen, Geir O., Bromwich, David H., Brown, R., Brown, L., Bruhwiler, Lori, Bulygina, Olga N., Burgess, D., Burrows, John, Calderon, Blanca, Camargo, Suzana J., Campbell, Jayaka, Cao, Y., Cappelen, J., Carrasco, Gualberto, Chambers, Don P., Chang A, L., Chappell, Petra, Chehade, Wissam, Cheliah, Muthuvel, Christiansen, Hanne H., Christy, John R., Ciais, Phillipe, Coelho, Caio A. S., Cogley, J. G., Colwell, Steve, Cross, J. N., Crouch, Jake, Cunningham, Stuart A., Dacic, Milan, Jeu, Richard A. M., Dekaa, Francis S., Demircan, Mesut, Derksen, C., Diamond, Howard J., Dlugokencky, Ed J., Dohan, Kathleen, Dolman, A. Johannes, Domingues, Catia M., Dong Shenfu, Dorigo, Wouter A., Drozdov, D. S., Duguay, Claude R., Dunn, Robert J. H., Duran-Quesada, Ana M., Dutton, Geoff S., Ehmann, Christian, Elkins, James W., Euscategui, Christian, Famiglietti, James S., Fang Fan, Fauchereau, Nicolas, Feely, Richard A., Fekete, Balazs M., Fenimore, Chris, Fioletov, Vitali E., Fogarty, Chris T., Fogt, Ryan L., Folland, Chris K., Foster, Michael J., Frajka-Williams, Eleanor, Franz, Bryan A., Frith, Stacey H., Frolov, I., Ganter, Catherine, Garzoli, Silvia, Geai, M. -L, Gerland, S., Gitau, Wilson, Gleason, Karin L., Gobron, Nadine, Goldenberg, Stanley B., Goni, Gustavo, Good, Simon A., Gottschalck, Jonathan, Gregg, Margarita C., Griffiths, Georgina, Grooss, Jens-Uwe, Guard, Charles Chip, Gupta, Shashi K., Hall, Bradley D., Halpert, Michael S., Harada, Yayoi, Hauri, C., Heidinger, Andrew K., Heikkila, Anu, Heim, Richard R., Heimbach, Patrick, Hidalgo, Hugo G., Hilburn, Kyle, Ho, Shu-Peng, Hobbs, Will R., Holgate, Simon, Hovsepyan, Anahit, Hu Zeng-Zhen, Hughes, P., Hurst, Dale F., Ingvaldsen, R., Inness, Antje, Jaimes, Ena, Jakobsson, Martin, James, Adamu I., Jeffries, Martin O., Johns, William E., Johnsen, Bjorn, Johnson, Gregory C., Johnson, Bryan, Jones, Luke T., Jumaux, Guillaume, Kabidi, Khadija, Kaiser, Johannes W., Kamga, Andre, Kang, Kyun-Kuk, Kanzow, Torsten O., Kao, Hsun-Ying, Keller, Linda M., Kennedy, John J., Key, J., Khatiwala, Samar, Pour, H. Kheyrollah, Kholodov, A. L., Khoshkam, Mahbobeh, Kijazi, Agnes, Kikuchi, T., Kim, B. -M, Kim, S. -J, Kimberlain, Todd B., Knaff, John A., Korshunova, Natalia N., Koskela, T., Kousky, Vernon E., Kramarova, Natalya, Kratz, David P., Krishfield, R., Kruger, Andries, Kruk, Michael C., Kumar, Arun, Lagerloef, Gary S. E., Lakkala, K., Lander, Mark A., Landsea, Chris W., Lankhorst, Matthias, Laurila, T., Lazzara, Matthew A., Lee, Craig, Leuliette, Eric, Levitus, Sydney, L Heureux, Michelle, Lieser, Jan, Lin, I-I, Liu, Y. Y., Liu, Y., Liu Hongxing, Liu Yanju, Lobato-Sanchez, Rene, Locarnini, Ricardo, Loeb, Norman G., Loeng, H., Long, Craig S., Lorrey, Andrew M., Luhunga, P., Lumpkin, Rick, Luo Jing-Jia, Lyman, John M., Macdonald, Alison M., Maddux, Brent C., Malekela, C., Manney, Gloria, Marchenko, S. S., Marengo, Jose A., Marotzke, Jochem, Marra, John J., Martinez-Gueingla, Rodney, Massom, Robert A., Mathis, Jeremy T., Mcbride, Charlotte, Mccarthy, Gerard, Mcvicar, Tim R., Mears, Carl, Meier, W., Meinen, Christopher S., Menendez, Melisa, Merrifield, Mark A., Mitchard, Edward, Mitchum, Gary T., Montzka, Stephen A., Morcrette, Jean-Jacques, Mote, Thomas, Muehle, Jens, Muehr, Bernhard, Mullan, A. Brett, Mueller, Rolf, Nash, Eric R., Nerem, R. Steven, Newlin, Michele L., Newman, Paul A., Ng Ongolo, H., Nieto, Juan Jose, Nishino, S., Nitsche, Helga, Noetzli, Jeannette, Oberman, N. G., Obregon, Andre, Ogallo, Laban A., Oludhe, Christopher S., Omar, Mohamed I., Overland, James, Oyunjargal, Lamjav, Parinussa, Robert M., Park, Geun-Ha, Park, E-Hyung, David Berry, Pasch, Richard J., Pascual-Ramirez, Reynaldo, Pelto, Mauri S., Penalba, Olga, Peng, L., Perovich, Don K., Pezza, Alexandre B., Phillips, David, Pickart, R., Pinty, Bernard, Pitts, Michael C., Purkey, Sarah G., Quegan, Shaun, Quintana, Juan, Rabe, B., Rahimzadeh, Fatemeh, Raholijao, Nirivololona, Raiva, I., Rajeevan, Madhavan, Ramiandrisoa, Voahanginirina, Ramos, Alexandre, Ranivoarissoa, Sahondra, Rayner, Nick A., Rayner, Darren, Razuveav, Vyacheslav N., Reagan, James, Reid, Phillip, Renwick, James, Revedekar, Jayashree, Richter-Menge, Jacqueline, Rivera, Ingrid L., Robinson, David A., Rodell, Matthew, Romanovsky, Vladimir E., Ronchail, Josyane, Rosenlof, Karen H., Sabine, Christopher L., Salvador, Mozar A., Sanchez-Lugo, Ahira, Santee, Michelle L., Sasgen, I., Sawaengphokhai, P., Sayouri, Amal, Scambos, Ted A., Schauer, U., Schemm, Jae, Schlosser, P., Schmid, Claudia, Schreck, Carl, Semiletov, Igor, Send, Uwe, Sensoy, Serhat, Setzer, Alberto, Severinghaus, Jeffrey, Shakhova, Natalia, Sharp, M., Shiklomanov, Nicolai I., Siegel, David A., Silva, Viviane B. S., Silva, Frabricio D. S., Sima, Fatou, Simeonov, Petio, Simmonds, I., Simmons, Adrian, Skansi, Maria, Smeed, David A., Smethie, W. M., Smith, Adam B., Smith, Cathy, Smith, Sharon L., Smith, Thomas M., Sokolov, V., Srivastava, A. K., Stackhouse, Paul W., Stammerjohn, Sharon, Steele, M., Steffen, Konrad, Steinbrecht, Wolfgang, Stephenson, Tannecia, Su, J., Svendby, T., Sweet, William, Takahashi, Taro, Tanabe, Raymond M., Taylor, Michael A., Tedesco, Marco, Teng, William L., Thepaut, Jean-Noel, Thiaw, Wassila M., Thoman, R., Thompson, Philip, Thorne, Peter W., Timmermans, M. -L, Tobin, Skie, Toole, J., Trewin, Blair C., Trigo, Ricardo M., Trotman, Adrian, Tschudi, M., Wal, Roderik S. W., Werf, Guido R., Vautard, Robert, Vazquez, J. L., Vieira, Goncalo, Vincent, Lucie, Vose, Russ S., Wagner, Wolfgang W., Wahr, John, Walsh, J., Wang Junhong, Wang Chunzai, Wang, M., Wang Sheng-Hung, Wang Lei, Wanninkhof, Rik, Weaver, Scott, Weber, Mark, Werdell, P. Jeremy, Whitewood, Robert, Wijffels, Susan, Wilber, Anne C., Wild, J. D., Willett, Kate M., Williams, W., Willis, Joshua K., Wolken, G., Wong, Takmeng, Woodgate, R., Worthy, D., Wouters, B., Wovrosh, Alex J., Xue Yan, Yamada, Ryuji, Yin Zungang, Yu Lisan, Zhang Liangying, Zhang Peiqun, Zhao Lin, Zhao, J., Zhong, W., Ziemke, Jerry, Zimmermann, S., ICOS-ATC (ICOS-ATC), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN), Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Muséum national d'Histoire naturelle (MNHN)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Extrèmes : Statistiques, Impacts et Régionalisation (ESTIMR), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)), École normale supérieure - Paris (ENS-PSL), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales [Toulouse] (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL), and Repositório da Universidade de Lisboa

Subjects
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, Atmospheric Science, 13. Climate action, Photosynthetically active radiation, Climate, Dynamics (mechanics), Data_FILES, Environmental science, Fraction (chemistry), 14. Life underwater, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment, Remote sensing
Abstract

For the first time in serveral years, the El Nino-Southern Oscillation did not dominate regional climate conditions around the globe. A weak La Ni a dissipated to ENSOneutral 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 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 Ni a-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 to the effects of La Ni a, 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 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 2 emissions from fossil fuel combustion and cement production reached a record 9.5 +/- 0.5 Pg C in 2011 and a new record of 9.7 +/- 0.5 Pg C is estimated for 2012. Atmospheric CO2 concentrations increased by 2.1 ppm in 2012, to 392.6 ppm. In spring 2012, 2 concentration exceeded 400 ppm at 7 of the 13 Arctic observation sites. Globally, other greenhouse gases including methane and nitrous oxide also continued to rise in concentration and the combined effect now represents a 32% increase in radiative forcing over a 1990 baseline. Concentrations of most ozone depleting substances continued to fall.

Published
2013
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22. El Niño-La Niña cycle and recent trends in continental evaporation

Author

Miralles, Diego G., van den Berg, Martinus J., Gash, John H., Parinussa, Robert M., de Jeu, Richard A.M, Beck, Hylke E., Holmes, Thomas R.H, Jimenez, Carlos, Verhoest, Niko E.C., Dorigo, Wouter A., Teuling, Adriaan J., Dolman, A. Johannes, Miralles, Diego G., van den Berg, Martinus J., Gash, John H., Parinussa, Robert M., de Jeu, Richard A.M, Beck, Hylke E., Holmes, Thomas R.H, Jimenez, Carlos, Verhoest, Niko E.C., Dorigo, Wouter A., Teuling, Adriaan J., and Dolman, A. Johannes

Abstract

The hydrological cycle is expected to intensify in response to global warming. Yet, little unequivocal evidence of such an acceleration has been found on a global scale. This holds in particular for terrestrial evaporation, the crucial return flow of water from land to atmosphere. Here we use satellite observations to reveal that continental evaporation has increased in northern latitudes, at rates consistent with expectations derived from temperature trends. However, at the global scale, the dynamics of the El Niño/Southern Oscillation (ENSO) have dominated the multi-decadal variability. During El Niño, limitations in terrestrial moisture supply result in vegetation water stress and reduced evaporation in eastern and central Australia, southern Africa and eastern South America. The opposite situation occurs during La Niña. Our results suggest that recent multi-year declines in global average continental evaporation reflect transitions to El Niño conditions, and are not the consequence of a persistent reorganization of the terrestrial water cycle. Future changes in continental evaporation will be determined by the response of ENSO to changes in global radiative forcing, which still remains highly uncertain.

Published
2014

23. The Evaluation of Single-Sensor Surface Soil Moisture Anomalies over the Mainland of the People's Republic of China.

Author

Parinussa, Robert M., Guojie Wang, Liu, Yi Y., Hagan, Daniel F. T., Fenfang Lin, van der Schalie, Robin, and de Jeu, Richard A. M.

Subjects
*SOIL moisture measurement, *SEAWATER salinity, *MEASUREMENT of salinity, *RADIOMETERS, *MICROWAVE imaging, *RADIO interference, *MICROWAVE detectors
Abstract

In recent years, different space agencies have launched satellite missions that carry passive microwave instruments on-board that can measure surface soil moisture. Three currently operational missions are the Soil Moisture and Ocean Salinity (SMOS) mission developed by the European Space Agency (ESA), the Advanced Microwave Scanning Radiometer 2 (AMSR2) developed by the Japan Aerospace Exploration Agency (JAXA), and the Microwave Radiation Imager (MWRI) from China's National Satellite Meteorological Centre (NSMC). In this study, the quality of surface soil moisture anomalies derived from these passive microwave instruments was sequentially assessed over the mainland of the People's Republic of China. First, the impact of a recent update in the Land Parameter Retrieval Model (LPRM) was assessed for MWRI observations. Then, the soil moisture measurements retrieved from the X-band observations of MWRI were compared with those of AMSR2, followed by an internal comparison of the multiple frequencies of AMSR2. Finally, SMOS retrievals from two different algorithms were also included in the comparison. For each sequential step, processing and verification chains were specifically designed to isolate the impact of algorithm (version), observation frequency or instrument characteristics. Two verification techniques are used: the statistical Triple Collocation technique is used as the primary verification tool, while the precipitation-based Rvalue technique is used to confirm key results. Our results indicate a consistently better performance throughout the entire study area after the implementation of an update of the LPRM.We also find that passive microwave observations in the AMSR2 C-band frequency (6.9 GHz) have an advantage over the AMSR2 X-band frequency (10.7 GHz) over moderate to densely vegetated regions. This finding is in line with theoretical expectations as emitted soil radiation will become masked under a dense canopy with stricter thresholds for higher passive microwave frequencies. Both AMSR2 and MWRI make X-band observations; a direct comparison between them reveals a consistently higher quality obtained by AMSR2, specifically over semi-arid climate regimes. Unfortunately, Radio Frequency Interference hampers the usefulness of soil moisture products for the SMOS L-band mission, leading to a significantly reduced revisit time over the densely populated eastern part of the country. Nevertheless, our analysis demonstrates that soil moisture products from a number of multi-frequency microwave sensors are credible alternatives for this dedicated L-band mission over the mainland of the People's Republic of China. [ABSTRACT FROM AUTHOR]

Published
2017
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24. El Niño–La Niña cycle and recent trends in continental evaporation

Author

Miralles, Diego G., primary, van den Berg, Martinus J., additional, Gash, John H., additional, Parinussa, Robert M., additional, de Jeu, Richard A. M., additional, Beck, Hylke E., additional, Holmes, Thomas R. H., additional, Jiménez, Carlos, additional, Verhoest, Niko E. C., additional, Dorigo, Wouter A., additional, Teuling, Adriaan J., additional, and Johannes Dolman, A., additional

Published
2013
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25. Comparing and Combining Remotely Sensed Land Surface Temperature Products for Improved Hydrological Applications.

Author

Parinussa, Robert M., Lakshmi, Venkat, Johnson, Fiona, and Sharma, Ashish

Subjects
*LAND surface temperature, *REMOTE sensing in environmental monitoring, *HYDROLOGY, *MODIS (Spectroradiometer), *INFRARED imaging, *WEATHER forecasting
Abstract

Land surface temperature (LST) is an important variable that provides a valuable connection between the energy and water budget and is strongly linked to land surface hydrology. Space-borne remote sensing provides a consistent means for regularly observing LST using thermal infrared (TIR) and passive microwave observations each with unique strengths and weaknesses. The spatial resolution of TIR based LST observations is around 1 km, a major advantage when compared to passive microwave observations (around 10 km). However, a major advantage of passive microwaves is their cloud penetrating capability making them all-weather sensors whereas TIR observations are routinely masked under the presence of clouds and aerosols. In this study, a relatively simple combination approach that benefits from the cloud penetrating capacity of passive microwave sensors was proposed. In the first step, TIR and passive microwave LST products were compared over Australia for both anomalies and raw timeseries. A very high agreement was shown over the vast majority of the country with R² typically ranging from 0.50 to 0.75 for the anomalies and from 0.80 to 1.00 for the raw timeseries. Then, the scalability of the passive microwave based LST product was examined and a pixel based merging approach through linear scaling was proposed. The individual and merged LST products were further compared against independent LST from the re-analysis model outputs. This comparison revealed that the TIR based LST product agrees best with the re-analysis data (R² 0.26 for anomalies and R² 0.76 for raw data), followed by the passive microwave LST product (R² 0.16 for anomalies and R² 0.66 for raw data) and the combined LST product (R² 0.18 for anomalies and R² 0.62 for raw data). It should be noted that the drop in performance comes with an increased revisit frequency of approximately 20% compared to the revised frequency of the TIR alone. Additionally, this comparison against re-analysis data was subdivided over Australia's major climate zones and revealed that the relative agreement between the individual and combined LST products against the re-analysis data is consistent over these climate zones. These results are also consistent for both the anomalies and the raw time series. Finally, two examples were provided that demonstrate the proposed merging approach including an example for the Hunter Valley floods along Australia's central coast that experienced significant flooding in April 2015. [ABSTRACT FROM AUTHOR]

Published
2016
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28. The Impact of Local Acquisition Time on the Accuracy of Microwave Surface Soil Moisture Retrievals over the Contiguous United States.

Author

Fangni Lei, Crow, Wade T., Huanfeng Shen, Parinussa, Robert M., and Holmes, Thomas R. H.

Subjects
MICROWAVES, SOIL moisture, IMAGE retrieval, REMOTE sensing, LAND surface temperature
Abstract

Satellite-derived soil moisture products have become an important data source for the study of land surface processes and related applications. For satellites with sun-synchronous orbits, these products are typically derived separately for ascending and descending overpasses with different local acquisition times. Moreover, diurnal variations in land surface conditions, and the extent to which they are accurately characterized in retrieval algorithms, lead to distinct systematic and random error characteristics in ascending versus descending soil moisture products. Here, we apply two independent evaluation techniques (triple collocation and direct comparison against sparse ground-based observations) to quantify (correlation-based) accuracy differences in satellite-derived surface soil moisture acquired at different local acquisition times. The orbits from different satellites are separated into two overpass categories: AM (12:00 a.m. to 11:59 a.m. Local Solar Time) and PM (12:00 p.m. to 11:59 p.m. Local Solar Time). Results demonstrate how patterns in the accuracy of AM versus PM retrieval products obtained from a variety of active and passive microwave satellite sensors vary according to land cover and across satellite products with different local acquisition times. [ABSTRACT FROM AUTHOR]

Published
2015
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29. Error Estimates for Near-Real-Time Satellite Soil Moisture as Derived From the Land Parameter Retrieval Model.

Author

Parinussa, Robert M., Meesters, Antoon G. C. A., Liu, Yi Y., Dorigo, Wouter, Wagner, Wolfgang, and de Jeu, Richard A. M.

Abstract

A time-efficient solution to estimate the error of satellite surface soil moisture from the land parameter retrieval model is presented. The errors are estimated using an analytical solution for soil moisture retrievals from this radiative-transfer-based model that derives soil moisture from low-frequency passive microwave observations. The error estimate is based on a basic error propagation equation which uses the partial derivatives of the radiative transfer equation and estimated errors for each individual input parameter. Results similar to those of the Monte Carlo approach show that the developed time-efficient methodology could substitute computationally intensive methods. This procedure is therefore a welcome solution for near-real-time data assimilation studies where both the soil moisture product and error estimate are needed. The developed method is applied to the C-, X-, and Ku-bands of the Aqua/Advanced Microwave Scanning Radiometer for Earth Observing System sensor to study differences in errors between frequencies. [ABSTRACT FROM PUBLISHER]

Published
2011
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30. An Evaluation of Soil Moisture Anomalies from Global Model-Based Datasets over the People's Republic of China.

Author

Hagan, Daniel Fiifi Tawia, Parinussa, Robert M., Wang, Guojie, and Draper, Clara S.

Subjects
SOIL moisture, LONG-range weather forecasting, LAND-atmosphere interactions, GROUND vegetation cover, ATMOSPHERIC models, NEW product development
Abstract

Soil moisture is an important factor in land-atmosphere interactions and other land processes. Improved estimates from climate models have, in the last two decades, become an important alternate source of information. In this study, we extend the evaluation of soil moisture anomalies of different generations of three families of model datasets (the European Center for Medium-Range Weather Forecasts' (ECMWF) reanalysis, the Modern Era Retrospective Analysis for Research and Applications of NASA, and the Global Land Data Assimilation System of theNational Oceanic and Atmospheric Administration (NOAA)) in recent studies to the People's Republic of China. Two validation techniques, namely, root-mean-square error (RMSE) from triple collocation analysis (TCA) and correlations (R) with ground observations, were used. The study confirmed the results of previous studies that focused on other regions and showed that the newer generations of each modeling family generally had better skill than the older generations with higher correlations and lower RMSEs. A cross-validation of the results from the two techniques for the newer products showed that the higher correlations and lower RMSEs from the TCA were found over regions with moderate vegetation cover, while regions with less vegetation cover had lower correlations and larger RMSEs (ECMWF (R: −0.93), NASA (R: −0.73), and NOAA (R: −0.61)), indicating that these two techniques complement each other to fairly validate the products. [ABSTRACT FROM AUTHOR]

Published
2020
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31. State of the Climate in 2012 INTRODUCTION

Author

Achberger, Christine, Ackerman, Stephen A., Albanil, Adelina, Alexander, P., Alfaro, Eric J., Allan, Rob, Alves, Lincoln M., Amador, Jorge A., Ambenje, Peter, Andrianjafinirina, Solonomenjanahary, Antonov, John, Aravequia, Jose A., Arendt, A., Arevalo, Juan, Arndt, Derek S., Ashik, I., Atheru, Zachary, Banzon, Viva, Baringer, Molly O., Barreira, Sandra, Barriopedro, David E., Beard, Grant, Becker, Andreas, Behrenfeld, Michael J., Bell, Gerald D., Benedetti, Angela, Bernhard, Germar, Berrisford, Paul, Berry, David I., Bhatt, U., Bidegain, Mario, Bindoff, Nathan, Bissolli, Peter, Blake, Eric S., Blunden, Jessica, Booneeady, Raj, Bosilovich, Michael, Box, J. E., Boyer, Tim, Braathen, Geir O., Bromwich, David H., Brown, R., Brown, L., Bruhwiler, Lori, Bulygina, Olga N., Burgess, D., Burrows, John, Calderon, Blanca, Camargo, Suzana J., Campbell, Jayaka, Cao, Y., Cappelen, J., Carrasco, Gualberto, Chambers, Don P., Chang A, L., Chappell, Petra, Chehade, Wissam, Cheliah, Muthuvel, Christiansen, Hanne H., Christy, John R., Ciais, Phillipe, Coelho, Caio A. S., Cogley, J. G., Colwell, Steve, Cross, J. N., Crouch, Jake, Cunningham, Stuart A., Dacic, Milan, Jeu, Richard A. M., Dekaa, Francis S., Demircan, Mesut, Derksen, C., Diamond, Howard J., Dlugokencky, Ed J., Dohan, Kathleen, Dolman, A. Johannes, Domingues, Catia M., Dong Shenfu, Dorigo, Wouter A., Drozdov, D. S., Duguay, Claude R., Dunn, Robert J. H., Duran-Quesada, Ana M., Dutton, Geoff S., Ehmann, Christian, Elkins, James W., Euscategui, Christian, Famiglietti, James S., Fang Fan, Fauchereau, Nicolas, Feely, Richard A., Fekete, Balazs M., Fenimore, Chris, Fioletov, Vitali E., Fogarty, Chris T., Fogt, Ryan L., Folland, Chris K., Foster, Michael J., Frajka-Williams, Eleanor, Franz, Bryan A., Frith, Stacey H., Frolov, I., Ganter, Catherine, Garzoli, Silvia, Geai, M. -L, Gerland, S., Gitau, Wilson, Gleason, Karin L., Gobron, Nadine, Goldenberg, Stanley B., Goni, Gustavo, Good, Simon A., Gottschalck, Jonathan, Gregg, Margarita C., Griffiths, Georgina, Grooss, Jens-Uwe, Guard, Charles Chip, Gupta, Shashi K., Hall, Bradley D., Halpert, Michael S., Harada, Yayoi, Hauri, C., Heidinger, Andrew K., Heikkila, Anu, Heim, Richard R., Heimbach, Patrick, Hidalgo, Hugo G., Hilburn, Kyle, Ho, Shu-Peng, Hobbs, Will R., Holgate, Simon, Hovsepyan, Anahit, Hu Zeng-Zhen, Hughes, P., Hurst, Dale F., Ingvaldsen, R., Inness, Antje, Jaimes, Ena, Jakobsson, Martin, James, Adamu I., Jeffries, Martin O., Johns, William E., Johnsen, Bjorn, Johnson, Gregory C., Johnson, Bryan, Jones, Luke T., Jumaux, Guillaume, Kabidi, Khadija, Kaiser, Johannes W., Kamga, Andre, Kang, Kyun-Kuk, Kanzow, Torsten O., Kao, Hsun-Ying, Keller, Linda M., Kennedy, John J., Key, J., Khatiwala, Samar, Pour, H. Kheyrollah, Kholodov, A. L., Khoshkam, Mahbobeh, Kijazi, Agnes, Kikuchi, T., Kim, B. -M, Kim, S. -J, Kimberlain, Todd B., Knaff, John A., Korshunova, Natalia N., Koskela, T., Kousky, Vernon E., Kramarova, Natalya, Kratz, David P., Krishfield, R., Kruger, Andries, Kruk, Michael C., Kumar, Arun, Lagerloef, Gary S. E., Lakkala, K., Lander, Mark A., Landsea, Chris W., Lankhorst, Matthias, Laurila, T., Lazzara, Matthew A., Lee, Craig, Leuliette, Eric, Levitus, Sydney, L Heureux, Michelle, Lieser, Jan, Lin, I-I, Liu, Y. Y., Liu, Y., Liu Hongxing, Liu Yanju, Lobato-Sanchez, Rene, Locarnini, Ricardo, Loeb, Norman G., Loeng, H., Long, Craig S., Lorrey, Andrew M., Luhunga, P., Lumpkin, Rick, Luo Jing-Jia, Lyman, John M., Macdonald, Alison M., Maddux, Brent C., Malekela, C., Manney, Gloria, Marchenko, S. S., Marengo, Jose A., Marotzke, Jochem, Marra, John J., Martinez-Gueingla, Rodney, Massom, Robert A., Mathis, Jeremy T., Mcbride, Charlotte, Mccarthy, Gerard, Mcvicar, Tim R., Mears, Carl, Meier, W., Meinen, Christopher S., Menendez, Melisa, Merrifield, Mark A., Mitchard, Edward, Mitchum, Gary T., Montzka, Stephen A., Morcrette, Jean-Jacques, Mote, Thomas, Muehle, Jens, Muehr, Bernhard, Mullan, A. Brett, Mueller, Rolf, Nash, Eric R., Nerem, R. Steven, Newlin, Michele L., Newman, Paul A., Ng Ongolo, H., Nieto, Juan Jose, Nishino, S., Nitsche, Helga, Noetzli, Jeannette, Oberman, N. G., Obregon, Andre, Ogallo, Laban A., Oludhe, Christopher S., Omar, Mohamed I., Overland, James, Oyunjargal, Lamjav, Parinussa, Robert M., Park, Geun-Ha, Park, E-Hyung, Parker, David, Pasch, Richard J., Pascual-Ramirez, Reynaldo, Pelto, Mauri S., Penalba, Olga, Peng, L., Perovich, Don K., Pezza, Alexandre B., Phillips, David, Pickart, R., Pinty, Bernard, Pitts, Michael C., Purkey, Sarah G., Quegan, Shaun, Quintana, Juan, Rabe, B., Rahimzadeh, Fatemeh, Raholijao, Nirivololona, Raiva, I., Rajeevan, Madhavan, Ramiandrisoa, Voahanginirina, Ramos, Alexandre, Ranivoarissoa, Sahondra, Rayner, Nick A., Rayner, Darren, Razuveav, Vyacheslav N., Reagan, James, Reid, Phillip, Renwick, James, Revedekar, Jayashree, Richter-Menge, Jacqueline, Rivera, Ingrid L., Robinson, David A., Rodell, Matthew, Romanovsky, Vladimir E., Ronchail, Josyane, Karen Rosenlof, Sabine, Christopher L., Salvador, Mozar A., Sanchez-Lugo, Ahira, Santee, Michelle L., Sasgen, I., Sawaengphokhai, P., Sayouri, Amal, Scambos, Ted A., Schauer, U., Schemm, Jae, Schlosser, P., Schmid, Claudia, Schreck, Carl, Semiletov, Igor, Send, Uwe, Sensoy, Serhat, Setzer, Alberto, Severinghaus, Jeffrey, Shakhova, Natalia, Sharp, M., Shiklomanov, Nicolai I., Siegel, David A., Silva, Viviane B. S., Silva, Frabricio D. S., Sima, Fatou, Simeonov, Petio, Simmonds, I., Simmons, Adrian, Skansi, Maria, Smeed, David A., Smethie, W. M., Smith, Adam B., Smith, Cathy, Smith, Sharon L., Smith, Thomas M., Sokolov, V., Srivastava, A. K., Stackhouse, Paul W., Stammerjohn, Sharon, Steele, M., Steffen, Konrad, Steinbrecht, Wolfgang, Stephenson, Tannecia, Su, J., Svendby, T., Sweet, William, Takahashi, Taro, Tanabe, Raymond M., Taylor, Michael A., Tedesco, Marco, Teng, William L., Thepaut, Jean-Noel, Thiaw, Wassila M., Thoman, R., Thompson, Philip, Thorne, Peter W., Timmermans, M. -L, Tobin, Skie, Toole, J., Trewin, Blair C., Trigo, Ricardo M., Trotman, Adrian, Tschudi, M., Wal, Roderik S. W., Werf, Guido R., Vautard, Robert, Vazquez, J. L., Vieira, Goncalo, Vincent, Lucie, Vose, Russ S., Wagner, Wolfgang W., Wahr, John, Walsh, J., Wang Junhong, Wang Chunzai, Wang, M., Wang Sheng-Hung, Wang Lei, Wanninkhof, Rik, Weaver, Scott, Weber, Mark, Werdell, P. Jeremy, Whitewood, Robert, Wijffels, Susan, Wilber, Anne C., Wild, J. D., Willett, Kate M., Williams, W., Willis, Joshua K., Wolken, G., Wong, Takmeng, Woodgate, R., Worthy, D., Wouters, B., Wovrosh, Alex J., Xue Yan, Yamada, Ryuji, Yin Zungang, Yu Lisan, Zhang Liangying, Zhang Peiqun, Zhao Lin, Zhao, J., Zhong, W., Ziemke, Jerry, and Zimmermann, S.

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