Geochemical Tracers in the Northwater Polynya

北水湖间地球化学示踪剂

• 批准号: 9726153
• 负责人: J Kirk Cochran
• 金额: $ 46.84万
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-15 至 2002-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9726153&HistoricalAwards=false
• 关键词: Geochemical; Tracers; Northwater; Polynya

This proposal seeks support for the principal investigators' participation in the multi-investigator, international North Water Polynya Program organized by Canada. The larger project will test hypotheses for the formation of the polynya, and this proposal will supply Geochemical tracer measurements that are important in gaining an understanding of the present-day ecosystem dynamics and their relations to polynya size and formation processes. Specifically, the Geochemical tracer work addresses two classes of processes operating with the North Water polynya: 1) the sinking flux of particulate organic carbon (POC), and 2) net community production and carbon cycling. The sinking flux of POC will be quantified based on the water column distributions of the natural U-238 series radionuclide Th-237. The distribution of nutrients, oxygen and dissolved inorganic carbon (DIC) in the water column will be used to deduce the net biological production of the North Water ecosystem. Dissolved organic carbon will be measured to examine the partitioning between the DOC and POC pools. The principal investigators have been invited to participate in the 1998 Canadian-sponsored cruise to the polynya. Both spatial and temporal variability in the Geochemical tracers will be addressed in the proposed sampling scheme.

该提案寻求对主要研究人员参与加拿大组织的国际北水间湖计划的支持。 较大的项目将测试冰间湖形成的假设，该提案将提供地球化学示踪测量，这对于了解当今的生态系统动态及其与冰间湖大小和形成过程的关系非常重要。 具体来说，地球化学示踪工作涉及北水冰间湖的两类过程：1）颗粒有机碳（POC）的沉没通量，2）净群落生产和碳循环。 POC 的沉通量将根据天然 U-238 系列放射性核素 Th-237 的水柱分布进行量化。 水体中营养物、氧气和溶解无机碳（DIC）的分布将用于推算北水生态系统的净生物生产量。 将测量溶解的有机碳以检查 DOC 和 POC 池之间的分配。 主要研究人员被邀请参加 1998 年加拿大赞助的冰间湖巡游。 地球化学示踪剂的空间和时间变化都将在提议的采样方案中得到解决。