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SGER: Distribution of terrigenous dissolved organic carbon in the Arctic Ocean: The importance of surface water circulation patterns and retention times

SGER：北冰洋陆源溶解有机碳的分布：地表水循环模式和保留时间的重要性

基本信息

批准号：
0822429
负责人：
David Kadko
金额：
$ 4.8万
依托单位：
University of Miami
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2008
资助国家：
美国
起止时间：
2008-06-01 至 2010-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0822429&HistoricalAwards=false
关键词：
SGER Distribution terrigenous dissolved organic

项目摘要

Funds are provided to allow the PI to participate in the 2008 cruise of the R/V Polarstern to the Russian arctic shelf and slope waters. Prior studies in the Beaufort Gyre resulted in the hypothesis that the dissolved organic carbon (DOC) concentrations found in the polar surface layer (PSL) of the Arctic Ocean are largely controlled by the time since the water last resided on the shelf. Access to the Russian arctic shelf and slope waters is limited for US scientists. The samples to be collected during the 2008 Polarstern cruise will provide a high-resolution distribution of both 228Ra/226Ra ratios and DOC concentrations across the upper eastern Arctic Ocean, allowing the evaluation of the residence time and degradation of terrestrial DOC in the PSL waters of that region, where he believes residence times will be much shorter than in the Beaufort Gyre. Arctic soils contain a disproportionate load of the global soil organic carbon stock, and its mobilization is possible as those soils thaw and drain in response to climate change. Useful predictions on the effect of these changes on carbon dynamics depends on the collection and interpretation of high quality data, such as proposed, to characterize the present day carbon dynamics of the Arctic.

提供资金，使PI能够参加2008年R/V Polarstern到俄罗斯北极大陆架和斜坡沃茨的巡航。先前的研究在博福特环流导致的假设，溶解有机碳（DOC）的浓度发现在极地表层（PSL）的北冰洋在很大程度上控制的时间，因为水最后居住在货架上。美国科学家进入俄罗斯北极大陆架和斜坡沃茨的机会有限。在2008年北极星号巡航期间收集的样本将提供整个北冰洋上东部的228 Ra/226 Ra比率和DOC浓度的高分辨率分布，从而可以评估该地区PSL沃茨中陆地DOC的停留时间和降解情况，他认为该地区的停留时间将比博福特环流短得多。北极土壤中含有不成比例的全球土壤有机碳储量，随着这些土壤为应对气候变化而解冻和流失，其流动是可能的。对这些变化对碳动态的影响的有效预测取决于收集和解释高质量的数据，如建议，以描述北极目前的碳动态。