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Strong biological uptake of carbon in a polynya of the Amundsen Sea, Antarctica

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Title
Strong biological uptake of carbon in a polynya of the Amundsen Sea, Antarctica
Other Titles
남극 아문젠해 빙호에서 일어나는 생물활동에 의한 강력한 탄소 흡수
Authors
Kim, Young Nam
Shin, Hyoung Chul
Kim, Hyun-cheol
Rhee, Tae Siek
Hahm, Doshik
Lee, Sang H.
Keywords
Amundsen Sea; Net community production; biological pump
Issue Date
2012
Citation
Kim, Young Nam, et al. 2012. Strong biological uptake of carbon in a polynya of the Amundsen Sea, Antarctica. Surface. Surface. 2012.11.26~.
Abstract
We surveyed O2/Ar in the surface waters of the Amundsen Sea during the austral summer to investigate the variability of net community production (NCP), a measure of the net carbon removed from the atmosphere via biological productivity. The biological O2 saturation (∆O2/Ar) dropped as low as -10% in the sea-ice area, implying net consumption of O2 over the winter as a result of respiration and limited production. In contrast, ∆O2/Ar increased to 30% in the polynya, where ∆O2/Ar, together with pCO2 and chlorophyll-a, showed a strong correlation with sea surface temperature. This finding suggests that when the sea ice melts, causing radiative heating, the upper water column is stabilized, and this stabilization results in the high biological productivity and consequent O2 supersaturation in the polynya. The NCP in the polynya was 90 - 170 mmol O2 m−2 d−1, making the Amundsen polynya one of the most effective carbon sinks in the world’ s oceans. The biological O2 saturation (∆O2/Ar) dropped as low as -10% in the sea-ice area, implying net consumption of O2 over the winter as a result of respiration and limited production. In contrast, ∆O2/Ar increased to 30% in the polynya, where ∆O2/Ar, together with pCO2 and chlorophyll-a, showed a strong correlation with sea surface temperature. This finding suggests that when the sea ice melts, causing radiative heating, the upper water column is stabilized, and this stabilization results in the high biological productivity and consequent O2 supersaturation in the polynya. The NCP in the polynya was 90 - 170 mmol O2 m−2 d−1, making the Amundsen polynya one of the most effective carbon sinks in the world’ s oceans.
URI
http://repository.kopri.re.kr/handle/201206/8366
Conference Name
Surface
Conference Place
Surface
Conference Date
2012.11.26~
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