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Removal of Refractory Dissolved Organic Carbon in the Amundsen Sea, Antarctica.
Scientific Reports ( IF 3.8 ) Pub Date : 2020-01-27 , DOI: 10.1038/s41598-020-57870-6 Ling Fang 1, 2 , SangHoon Lee 3 , Shin-Ah Lee 1 , Doshik Hahm 4 , Guebuem Kim 1 , Ellen R M Druffel 5 , Jeomshik Hwang 1
Scientific Reports ( IF 3.8 ) Pub Date : 2020-01-27 , DOI: 10.1038/s41598-020-57870-6 Ling Fang 1, 2 , SangHoon Lee 3 , Shin-Ah Lee 1 , Doshik Hahm 4 , Guebuem Kim 1 , Ellen R M Druffel 5 , Jeomshik Hwang 1
Affiliation
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The removal mechanism of refractory deep-ocean dissolved organic carbon (deep-DOC) is poorly understood. The Amundsen Sea Polynya (ASP) serves as a natural test basin for assessing the fate of deep-DOC when it is supplied with a large amount of fresh-DOC and exposed to strong solar radiation during the polynya opening in austral summer. We measured the radiocarbon content of DOC in the water column on the western Amundsen shelf. The radiocarbon content of DOC in the surface water of the ASP reflected higher primary production than in the region covered by sea ice. The radiocarbon measurements of DOC, taken two years apart in the ASP, were different, suggesting rapid cycling of DOC. The increase in DOC concentration was less than expected from the observed increase in radiocarbon content from those at the greatest depths. Based on a radiocarbon mass balance, we show that deep-DOC is consumed along with fresh-DOC in the ASP. Our observations imply that water circulation through the surface layer, where fresh-DOC is produced, may play an important role in global DOC cycling.
中文翻译：
去除南极阿蒙森海中难溶的溶解有机碳。
难熔深海溶解有机碳（deep-DOC）的去除机理了解甚少。Amundsen Sea Polynya（ASP）是一个自然的试验盆，用于评估深DOC的命运，当向其供应大量新鲜的DOC并在夏季南方的Polynya开放期间暴露于强烈的太阳辐射下时，它会如何评估。我们测量了Amundsen陆架西部水柱中DOC的放射性碳含量。ASP地表水中DOC的放射性碳含量比海冰覆盖地区反映出更高的初级产量。在ASP中间隔两年进行的DOC放射性碳测量结果有所不同，这表明DOC的快速循环。DOC浓度的增加小于最深处放射性碳含量增加所观察到的预期。基于放射性碳的质量平衡，我们显示深DOC和ASP中的新鲜DOC一起被消耗。我们的观察结果表明，通过表层的水循环（生产新鲜DOC的水）可能在全球DOC循环中发挥重要作用。
更新日期：2020-01-27
中文翻译：
去除南极阿蒙森海中难溶的溶解有机碳。
难熔深海溶解有机碳（deep-DOC）的去除机理了解甚少。Amundsen Sea Polynya（ASP）是一个自然的试验盆，用于评估深DOC的命运，当向其供应大量新鲜的DOC并在夏季南方的Polynya开放期间暴露于强烈的太阳辐射下时，它会如何评估。我们测量了Amundsen陆架西部水柱中DOC的放射性碳含量。ASP地表水中DOC的放射性碳含量比海冰覆盖地区反映出更高的初级产量。在ASP中间隔两年进行的DOC放射性碳测量结果有所不同，这表明DOC的快速循环。DOC浓度的增加小于最深处放射性碳含量增加所观察到的预期。基于放射性碳的质量平衡，我们显示深DOC和ASP中的新鲜DOC一起被消耗。我们的观察结果表明，通过表层的水循环（生产新鲜DOC的水）可能在全球DOC循环中发挥重要作用。
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