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

提供资金允许PI参加2008年的R/V北极星号到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的假设是，在北冰洋极地表层（PSL）中发现的溶解有机碳（DOC）浓度在很大程度上受水上次停留在大陆架上的时间的控制。美国科学家进入俄罗斯北极大陆架和斜坡水域受到限制。在2008年北极星号巡航期间收集的样本将提供北冰洋东部上部228Ra/226Ra比率和DOC浓度的高分辨率分布，从而可以评估该地区PSL水域陆地DOC的停留时间和降解情况，他认为那里的停留时间将比波弗特环流短得多。北极土壤含有全球土壤有机碳储量的不成比例的负荷，随着这些土壤因气候变化而融化和流失，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，如所提议的，以表征北极目前的碳动态。

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.