High Northern Latitude Linkages between Atlantic Water, DSOW Formation and GIS Stability during the Holocene

全新世期间北高纬度大西洋水、DSOW 形成和 GIS 稳定性之间的联系

• 批准号: 0823535
• 负责人: Anne Jennings
• 金额: $ 39.94万
• 依托单位: University of Colorado at Boulder
• 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: 2008-09-15 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0823535&HistoricalAwards=false
• 关键词: Northern; Latitude; Linkages; between; Atlantic

This award will provide funds to test three hypotheses related to the formation of intermediate and deep water in the Nordic Seas north of Iceland. Specifically, was 1) Denmark Straight Overflow Water (DSOW) formation dampened by freshening of Atlantic Water entering the Nordic Seas through the end of the deglaciation of the Laurentide Ice Sheet, ca. 6,700 cal years ago? 2) Does the middle Holocene interval of greatest DSOW flow correspond to a time of minimal freshwater forcing from north and south and maximal salinity and inflow of the Irminger Current? 3) Was diminished DSOW formation in the late Holocene due to freshwater forcing from the Arctic Ocean by southward advancing Polar Water and sea ice? These hypotheses will be tested via analyses of sediment geochemistry and Mg/Ca, d18O and Cd/Ca of foraminifera assemblages from a suite of North Atlantic deep sea cores, as part of a broader international collaboration including the IPY project WARMPAST. Broader impacts include graduate and undergraduate involvement in the research, a strong international collaborative component and research on a societally-relevant scientific question related to ocean-climate linkages and mechanisms of climate change during the Holocene (last 10,000 years).

该奖项将提供资金，以测试与冰岛北部北欧海中层和深层水形成有关的三个假设。 具体来说，是1）丹麦直溢流水（DSOW）形成阻尼大西洋水进入北欧海通过结束的劳伦泰德冰盖，约冰川消退。6,700大卡？2)中全新世最大DSOW流量的时间间隔是否对应于最小的淡水迫使从北部和南部和最大的盐度和流入的Irminger电流？3)是减少DSOW形成在晚全新世由于淡水强迫从北冰洋向南推进极地水和海冰？这些假设将通过分析沉积物地球化学和镁/钙，d18 O和镉/钙的有孔虫组合从一套北大西洋深海岩心，作为一个更广泛的国际合作，包括IPY项目WARMPAST的一部分进行测试。更广泛的影响包括研究生和本科生参与研究，一个强大的国际合作组成部分和研究有关海洋气候联系和全新世（过去10,000年）气候变化机制的社会相关科学问题。