Evolution of the North Atlantic's Climate Over the Last 3000 Years and Comparison with Late MIS 5e

近3000年北大西洋气候演变及与MIS 5e晚期的比较

• 批准号: 0117465
• 负责人: Gerard Bond
• 金额: $ 25.5万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-09-15 至 2003-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0117465&HistoricalAwards=false
• 关键词: Evolution; North; Atlantic; Climate; Over

Science Summary: This proposal requests support for a multiproxy study to test the theory that atmospheric cooling beginning about 2000 years ago lead to increased production of North Atlantic Deep Water in the western North Atlantic primarily through an increase in Denmark Strait Overflow water. The sequence of events in the last 2000 years is very similar to events observed at the end of the last interglacial (MIS 5e) and suggests that the increase of deep water production in the western North Atlantic marks the beginning of the end of the current interglacial. This study will include detailed analysis of samples from cores in separate transects to determine sea surface temperature and rates of Holocene and MIS 5e deep water production across the North Atlantic. Proxies to be studied include faunal counts, stable isotope measurements of N. pachyderma (left and right coiling), IRD and IRD petrology. In addition trace element analyses (Cd/Ca, Zn/Ca, and Mg/Ca) will assist and check interpretations based on faunal and stable isotope data.

科学总结：这一建议要求支持多代理研究，以测试的理论，大气冷却开始约2000年前导致增加生产的北大西洋深水在北大西洋西部主要是通过增加丹麦海峡溢出水。过去2000年的事件序列与末次间冰期（MIS 5e）结束时观察到的事件非常相似，表明北大西洋西部深水产量的增加标志着当前间冰期结束的开始。 这项研究将包括详细分析不同断面的岩心样本，以确定整个北大西洋的海面温度和全新世和MIS 5e深水生产率。 拟研究的指标包括动物区系计数、N.厚皮（左和右线圈），IRD和IRD岩石学。 此外，微量元素分析（Cd/Ca、Zn/Ca和Mg/Ca）将有助于并检查基于动物群和稳定同位素数据的解释。