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

• 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

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.

提供资金允许 PI 参加 2008 年 R/V Polarstern 前往俄罗斯北极大陆架和斜坡水域的巡航。 先前对波弗特环流的研究得出这样的假设：北冰洋极地表层（PSL）中发现的溶解有机碳（DOC）浓度很大程度上受水最后停留在大陆架上的时间控制。 美国科学家进入俄罗斯北极大陆架和斜坡水域的机会受到限制。 2008 年 Polarstern 巡航期间采集的样本将提供整个北冰洋东部上部 228Ra/226Ra 比率和 DOC 浓度的高分辨率分布，从而可以评估陆地 DOC 在 PSL 水域中的停留时间和降解情况。他认为该地区的停留时间将比波弗特环流短得多。 北极土壤含有不成比例的全球土壤有机碳储量，随着这些土壤因气候变化而解冻和流失，其动员是可能的。对这些变化对碳动态影响的有用预测取决于高质量数据的收集和解释，例如所提出的，以表征当今北极的碳动态。