Response of sea surface fugacity of CO2 to the SAM shift south of Tasmania: Regional differences
Response of sea surface fugacity of CO2 to the SAM shift south of Tasmania: Regional differences
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DOI：
10.1002/2015gl063926
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发表时间：
2015-05
影响因子：
5.2
通讯作者：
L. Xue;Libao Gao;W. Cai;Weidong Yu;Meng Wei
中科院分区：
文献类型：
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作者：
L. Xue;Libao Gao;W. Cai;Weidong Yu;Meng Wei
利用1993-2011年在塔斯马尼亚岛南部收集的14次夏季航行观测数据，研究了2000年前后海面二氧化碳逸度对南环模（SAM）转变的响应。在南大洋南部（SO）或极区（PZ）和极锋区（PFZ），海表fCO2的增加速度在SAM转变前快于大气，而在转变后不明显。然而，在南北极北部或亚南极区（SAZ），无论在转变前后，地表fCO2的增加速度都快于大气fCO2。SAM的移动对PZ和PFZ的地表fCO2趋势有重要影响，而对SAZ没有影响，我们将其归因于区域海洋过程的差异（上升流与非上升流）。SAM的变化可能扭转了SO CO2吸收的负趋势。
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 (fCO2) 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), fCO2 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 fCO2 increased faster than atmospheric fCO2 both before and after the shift. The SAM shift had an important influence on the surface fCO2 trend in the PZ and PFZ but not in the SAZ, which we attribute to differences in regional oceanographic processes (upwelling versus nonupwelling). The SAM shift may have reversed the negative trend of SO CO2 uptake.