Investigating the Role of Ocean Circulation in Climate Change During the Last Ice Age Using 231Pa/230Th

使用 231Pa/230Th 研究末次冰河时期海洋环流在气候变化中的作用

• 批准号: 0937221
• 负责人: Jerry McManus
• 金额: $ 10.42万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-04-01 至 2010-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0937221&HistoricalAwards=false
• 关键词: Investigating; Role; Ocean; Circulation; Climate

ABSTRACT 0602384The last ice age was characterized by dramatic climate oscillations that appear to be linked to changes in the oceans meridional overturning circulation (MOC). Direct evidence for changes in the rate of MOC remains limited because traditional tracers can only provide snapshots of past water mass configurations without information about property transport. In this project, a new dynamical tracer of water circulation, Pa/Th, will be used to produce high-resolution, continuous 60,000-year record of MOC in the Atlantic Ocean during marine isotope stage 3. This research will be conducted on two high-quality cores from the subtropical and subpolar North Atlantic Ocean and will be carried out in parallel with complementary sedimentological and geochemical analyses as well as modeling studies. These data will explore linkages and phasing within the ocean-climate system and provide theoretical constraints on the interpretation of Pa/Th as a circulation proxy. This project will involve students in their research and in teaching at MIT/WHOI, and through NSF-funded and voluntary efforts to provide undergraduates with research experience in their studies. The PIs will continue outreach through presentations at college campuses and discussions in media such as newspapers and radio broadcasts. All data will be archived and made available to the scientific community as well as to the general public through web-based access at WHOI and NGDC.

摘要 0602384 最后一个冰河时代的特点是剧烈的气候波动，这似乎与海洋经向翻转环流 (MOC) 的变化有关。 MOC 速率变化的直接证据仍然有限，因为传统示踪剂只能提供过去水团配置的快照，而没有有关财产运输的信息。在该项目中，将使用一种新的水循环动态示踪剂 Pa/Th，在海洋同位素阶段 3 期间产生大西洋中 MOC 的高分辨率、连续 60,000 年记录。这项研究将在两个高-来自北大西洋副热带和副极地的优质岩心，并将与补充沉积学和地球化学分析以及模拟研究同时进行。这些数据将探索海洋气候系统内的联系和阶段性，并为解释 Pa/Th 作为环流代理提供理论约束。该项目将让学生参与 MIT/WHOI 的研究和教学，并通过 NSF 资助的自愿努力为本科生提供学习中的研究经验。 PI 将继续通过在大学校园进行演讲以及在报纸和广播等媒体上进行讨论来进行宣传。 所有数据都将被存档并通过 WHOI 和 NGDC 的网络访问提供给科学界以及公众。