Radiocarbon Ventilation Ages and Climate in the Northern Subtropical Atlantic

北亚热带大西洋的放射性碳通风年龄和气候

• 批准号: 0822854
• 负责人: Lloyd Keigwin
• 金额: $ 62.67万
• 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: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0822854&HistoricalAwards=false
• 关键词: Radiocarbon; Ventilation; Ages; Climate; Northern

This proposal seeks funds to conduct paleo-ocean and paleoclimate studies of deep ocean sediments from high deposition rate sites in the western subtropical North Atlantic. In the first year, research will be conducted on existing samples from Laurentian Fan and new samples will be collected during a three week surveying and coring cruise to locations between Newfoundland and the Mid Atlantic Ridge (MAR). Each location will be sampled with a multicorer, a gravity corer, and a large diameter long piston corer. The underlying theme of this research is to link radiocarbon ventilation ages in the deep ocean, as measured by paired 14C analysis of benthic and planktonic foraminifera, with surface ocean conditions on different spatial and temporal scales across the last 20,000 years. The primary scientific emphasis will be on developing a time series of ocean ventilation for the past several millennia, including the Little Ice Age, and targeting extreme climate events of the past 20,000 years since the end of the ice age. At present, there are insufficient published radiocarbon data to confirm whether or not significant ocean ventilations changes were associated with climate shifts in recent millennia. If the expected results show continuous, systematic changes in ocean ventilation in the recent past, then these results will provide an important boundary condition for understanding how global change and deep ocean circulation are linked. This research will have broad impact through taking teachers to sea and using web-based media to communicate with them and students as the project develops.

该提案寻求资金来对西部亚热带北大西洋高沉积速率地点深海沉积物进行古气候和古气候研究。在第一年，将对Laurentian粉丝的现有样品进行研究，并将在为期三周的测量和加油巡游中收集新样本，往返纽芬兰和中大西洋山脊（MAR）之间的地点。每个位置都将用多折射剂，重力液和大直径长的活塞旋塞采样。这项研究的基本主题是将深海的放射性碳通风衰老联系起来，通过对底栖和浮游有孔虫的配对14C分析来测量，过去20,000年来，在不同的空间和时间尺度上进行表面海洋条件。主要的科学重点将是在过去的几千年中，包括小冰河时代（包括小冰河时代）开发时间序列的海洋通风，并针对自冰河时代结束以来20，000年的极端气候事件。目前，发表的放射性碳数据不足，无法确认最近几千年中的气候变化是否与气候变化有关。 如果预期的结果显示了最近过去的海洋通风持续变化，那么这些结果将为了解全球变化和深海循环如何联系起来提供重要的边界条件。 这项研究将通过将教师带到海上并利用基于Web的媒体与他们和学生进行沟通，从而产生广泛的影响。