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: 0602384
• 负责人: Jerry McManus
• 金额: --
• 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: 2006
• 资助国家: 美国
• 起止时间: 2006-06-01 至 2009-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0602384&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征是戏剧性的气候振荡，似乎与海洋子午倾覆循环（MOC）的变化有关。直接证据证明MOC速率的变化仍然有限，因为传统示踪剂只能提供过去的水质量配置的快照，而无需有关财产运输的信息。在这个项目中，将使用新的水流通动力示踪剂Pa/th产生高分辨率，连续60，000年的MOC在海洋同位素阶段3期间在大西洋中的MOC记录。这项研究将对来自北大西洋亚热带和亚波面的两个高质量核心进行，并将与互补的层次分析，并将与互补的分析以及Gee Off and Cornectary Synectary和Gee Off andery anderalistary anderal sanect。这些数据将探索海洋气候系统中的联系和相分，并就PA/TH作为循环代理的解释提供理论上的约束。该项目将使学生参与他们的研究和在麻省理工学院/WHOI的教学，以及通过NSF资助和自愿的努力，以为大学生提供研究经验。 PI将通过大学校园的演讲以及报纸和广播等媒体的讨论继续推广。 所有数据将通过WHOI和NGDC的基于Web的访问来归档并提供给科学界以及公众。