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| Xue, Liang; Cai, Wei-jun; Takahashi, Taro; Gao, Libao; Wanninkhof, Rik; Wei, Meng; Li, Kuiping; Feng, Lin; Yu, Weidong. |
| While the effects of the Southern Annular Mode (SAM), a dominant climate variability mode in the Southern Ocean, on ocean acidification have been examined using models, no consensus has been reached. Using observational data from south of Tasmania, we show that during a period with positive SAM trends, surface water pH and aragonite saturation state at 60 degrees-55 degrees S (Antarctic Zone) decrease in austral summer at rates faster than those predicted from atmospheric CO2 increase alone, whereas an opposite pattern is observed at 50 degrees-45 degrees S (Subantarctic Zone). Together with other processes, the enhanced acidification at 60 degrees-55 degrees S may be attributed to increased westerly winds that bring in more "acidified" waters from the... |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00673/78486/80834.pdf |
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| Laruelle, Goulven G.; Cai, Wei-jun; Hu, Xinping; Gruber, Nicolas; Mackenzie, Fred T.; Regnier, Pierre. |
| It has been speculated that the partial pressure of carbon dioxide (pCO(2)) in shelf waters may lag the rise in atmospheric CO2. Here, we show that this is the case across many shelf regions, implying a tendency for enhanced shelf uptake of atmospheric CO2. This result is based on analysis of long-term trends in the air-sea pCO(2) gradient (Delta pCO(2)) using a global surface ocean pCO(2) database spanning a period of up to 35 years. Using wintertime data only, we find that Delta pCO(2) increased in 653 of the 825 0.5 degrees cells for which a trend could be calculated, with 325 of these cells showing a significant increase in excess of + 0.5 mu atm yr(-1) (p < 0.05). Although noisier, the deseasonalized annual data suggest similar results. If this... |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00673/78498/80777.pdf |
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| Bakker, Dorothee C. E.; Pfeil, Benjamin; Landa, Camilla S.; Metzl, Nicolas; O'Brien, Kevin M.; Olsen, Are; Smith, Karl; Cosca, Cathy; Harasawa, Sumiko; Jones, Stephen D.; Nakaoka, Shin-ichiro; Nojiri, Yukihiro; Schuster, Ute; Steinhoff, Tobias; Sweeney, Colm; Takahashi, Taro; Tilbrook, Bronte; Wada, Chisato; Wanninkhof, Rik; Alin, Simone R.; Balestrini, Carlos F.; Barbero, Leticia; Bates, Nicholas R.; Bianchi, Alejandro A.; Bonou, Frederic; Boutin, Jacqueline; Bozec, Yann; Burger, Eugene F.; Cai, Wei-jun; Castle, Robert D.; Chen, Liqi; Chierici, Melissa; Currie, Kim; Evans, Wiley; Featherstone, Charles; Feely, Richard A.; Fransson, Agneta; Goyet, Catherine; Greenwood, Naomi; Gregor, Luke; Hankin, Steven; Hardman-mountford, Nick J.; Harlay, Jerome; Hauck, Judith; Hoppema, Mario; Humphreys, Matthew P.; Hunt, Christopherw.; Huss, Betty; Ibanhez, J. Severino P.; Johannessen, Truls; Keeling, Ralph; Kitidis, Vassilis; Koertzinger, Arne; Kozyr, Alex; Krasakopoulou, Evangelia; Kuwata, Akira; Landschuetzer, Peter; Lauvset, Siv K.; Lefevre, Nathalie; Lo Monaco, Claire; Manke, Ansley; Mathis, Jeremy T.; Merlivat, Liliane; Millero, Frank J.; Monteiro, Pedro M. S.; Munro, David R.; Murata, Akihiko; Newberger, Timothy; Omar, Abdirahman M.; Ono, Tsuneo; Paterson, Kristina; Pearce, David; Pierrot, Denis; Robbins, Lisa L.; Saito, Shu; Salisbury, Joe; Schlitzer, Reiner; Schneider, Bernd; Schweitzer, Roland; Sieger, Rainer; Skjelvan, Ingunn; Sullivan, Kevin F.; Sutherland, Stewart C.; Sutton, Adrienne J.; Tadokoro, Kazuaki; Telszewski, Maciej; Tuma, Matthias; Van Heuven, Steven M. A. C. .; Vandemark, Doug; Ward, Brian; Watson, Andrew J.; Xu, Suqing. |
| The Surface Ocean CO2 Atlas (SOCAT) is a synthesis of quality-controlled fCO(2) (fugacity of carbon dioxide) values for the global surface oceans and coastal seas with regular updates. Version 3 of SOCAT has 14.7 million fCO(2) values from 3646 data sets covering the years 1957 to 2014. This latest version has an additional 4.6 million fCO(2) values relative to version 2 and extends the record from 2011 to 2014. Version 3 also significantly increases the data availability for 2005 to 2013. SOCAT has an average of approximately 1.2 million surface water fCO(2) values per year for the years 2006 to 2012. Quality and documentation of the data has improved. A new feature is the data set quality control (QC) flag of E for data from alternative sensors and... |
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| Ano: 2016 |
URL: https://archimer.ifremer.fr/doc/00383/49405/49890.pdf |
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| Wang, Hongjie; Hu, Xinping; Cai, Wei-jun; Sterba-boatwright, Blair. |
| Determination of the rate of change of sea surface CO2 fugacity (fCO(2)) is important, as the fCO(2) gradient between the atmosphere and the ocean determines the direction of CO2 flux and hence the fate of this greenhouse gas. Using a newly available, community-based global CO2 database (Surface Ocean CO2 Atlas Version 3 coastal data set) and a newly developed statistical method, we report that the global ocean margins (within 400km offshore, 30 degrees S-70 degrees N) fCO(2) temporal trends on decadal time scales (1.931.59atmyr(-1)) closely follow the atmospheric fCO(2) increase rate (1.900.06atmyr(-1)) in the Northern Hemisphere but are lower (1.350.55atmyr(-1)) in the Southern Hemisphere, reflecting dominant atmospheric forcing in conjunction with... |
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| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00662/77393/78999.pdf |
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| Xue, Liang; Gao, Libao; Cai, Wei-jun; Yu, Weidong; Wei, Meng. |
| Using observational data collected south of Tasmania during 14 austral summer cruises during 1993-2011, we examined the response of sea surface fugacity of carbon dioxide (fCO(2)) to the Southern Annular Mode (SAM) shift, which occurred around 2000. In the southern part of the Southern Ocean (SO) or the Polar Zone (PZ) and the Polar Frontal Zone (PFZ), fCO(2) increased faster at the sea surface than in the atmosphere before the SAM shift, but not after the shift. In the northern part of the SO or the Subantarctic Zone (SAZ), however, surface fCO(2) increased faster than atmospheric fCO(2) both before and after the shift. The SAM shift had an important influence on the surface fCO(2) trend in the PZ and PFZ but not in the SAZ, which we attribute to... |
| Tipo: Text |
Palavras-chave: Southern Ocean; Southern Annular Mode shift; Carbon cycling; Upwelling; South of Tasmania. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00292/40369/38947.pdf |
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