Recent evidence for a strengthening CO2 sink in the Southern Ocean from carbonate system measurements in the Drake Passage (2002-2015)

被引：73
作者：
Munro, David R. [1 ,2 ]
Lovenduski, Nicole S. [1 ,2 ]
Takahashi, Taro [3 ]
Stephens, Britton B. [4 ]
Newberger, Timothy [5 ,6 ]
Sweeney, Colm [5 ,6 ]
机构：
[1] Univ Colorado, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA
[2] Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA
[3] Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA
[4] Natl Ctr Atmospher Res, Boulder, CO 80307 USA
[5] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA
[6] NOAA Earth Syst Res Lab, Boulder, CO USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2015年 / 42卷 / 18期
基金：
美国国家科学基金会;
关键词：
carbon cycling; Southern Ocean; DISSOLVED INORGANIC CARBON; ANTHROPOGENIC CO2; SURFACE OCEAN; PCO(2); ACIDIFICATION; VARIABILITY; TRENDS; ALKALINITY; CHEMISTRY; NUTRIENTS;
D O I：
10.1002/2015GL065194
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
We present a 13year (2002-2015) semimonthly time series of the partial pressure of CO2 in surface water (pCO(2surf)) and other carbonate system parameters from the Drake Passage. This record shows a clear increase in the magnitude of the sea-air pCO(2) gradient, indicating strengthening of the CO2 sink in agreement with recent large-scale analyses of the world oceans. The rate of increase in pCO(2surf) north of the Antarctic Polar Front (APF) is similar to the atmospheric pCO(2) (pCO(2atm)) trend, whereas the pCO(2surf) increase south of the APF is slower than the pCO(2atm) trend. The high-frequency surface observations indicate that an absence of a winter increase in total CO2 (TCO2) and cooling summer sea surface temperatures are largely responsible for increasing CO2 uptake south of the APF. Muted winter trends in surface TCO2 also provide temporary stability to the carbonate system that is already close to undersaturation with respect to aragonite.
引用
收藏
页码：7623 / 7630
页数：8
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