EAGER: Deglacial Chronology of Bermuda Rise

EAGER：百慕大隆起的冰消年表

• 批准号: 1548160
• 负责人: Lloyd Keigwin
• 金额: $ 9.78万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-01 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1548160&HistoricalAwards=false
• 关键词: EAGER; Deglacial; Chronology; Bermuda; Rise

This award uses funds, under the auspices of the EArly-concept Grants for Exploratory Research (EAGER) program, for a project aimed at examining the causes and significance of perplexing inconsistencies in radiocarbon dates coming from 20,000 year old deep water sediments at the northeast Bermuda Rise.The deep, northeast Bermuda Rise is a classical location for study of climate over the last glacial cycle because of its high deposition rates and good preservation of foraminifera. Since it is also contains one of the deepest records of climate change and Bermuda Rise cores have been studied for over 30 years, it has become a standard reference section for climate history. Hence, getting the radiocarbon dating right is critical to calibrating time in this region and, perhaps, elsewhere if the inconsistencies in age dating are systemic and not simply local.The research activities fit well into the potentially transformative, high risk, and exploratory nature of the EAGER programs because it is hypothesized that results from this project will show that sediments on the seafloor can be "unmixed" by dating every sample. If this hypothesis is rejected, the resulting chronology will nevertheless be an improvement on the present situation, where important results are waiting for an improved age model before they can be published. If the hypothesis is accepted, however, the new chronology could inspire new research on this and other locations in the western North Atlantic. The cores from the Bermuda Rise targeted for this project would be a valuable resource for future researchers as they will have internally consistent stratigraphies and chronologies and future proxies for ocean and climate change will be linked in a common temporal and sedimentological framework.

该奖项由早期概念探索研究补助金(AGERGE)计划资助，用于一个项目，该项目旨在研究来自百慕大海岭东北部2万年前深水沉积物的放射性碳测年令人困惑的不一致的原因和意义。百慕大海隆东北部深处是研究上一次冰川周期气候的经典地点，因为它的高沉积速率和良好的有孔虫保存。由于它也是气候变化最深刻的记录之一，百慕大隆起岩芯已被研究了30多年，因此它已成为气候历史的标准参考区段。因此，如果年龄测定的不一致是系统性的，而不仅仅是局部的，那么正确的放射性碳测年对校准该地区的时间至关重要，也许在其他地方也是如此。研究活动很好地符合渴望项目潜在的变革性、高风险和探索性的性质，因为假设这个项目的结果将表明，通过测定每个样本，海底的沉积物可以“混合”。如果这一假设被否定，那么由此产生的年表仍将是对目前情况的改进，目前重要的结果正在等待改进的年龄模型，然后才能发表。然而，如果这一假设被接受，新的年表可能会激发对这个地点和北大西洋西部其他地点的新研究。该项目的目标是百慕大隆起的岩芯，这将是未来研究人员的宝贵资源，因为它们将拥有内部一致的地层和年表，未来的海洋和气候变化指标将在一个共同的时间和沉积学框架中联系在一起。