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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... |
| Tipo: Text |
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| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00673/78486/80834.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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