Reconstruction of the Pacific Marine ITCZ over the Last Glacial Cycle

末次冰期太平洋海洋 ITCZ 的重建

• 批准号: 1003374
• 负责人: Jean Lynch-Stieglitz
• 金额: $ 38.47万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-07-01 至 2014-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1003374&HistoricalAwards=false
• 关键词: Reconstruction; Pacific; Marine; ITCZ; over

Existing data and models present a confusing picture of how the Inter Tropical Convergence Zone (ITCZ), an integral part of the tropical climate system, responds under different boundary conditions. This research tests the hypothesis that the Pacific Marine ITCZ shifts to the south, and perhaps even below the equator, during glacial times. Using an innovative approach (measuring oxygen isotope ratios measured on planktonic foraminifera that calcify at the base of the photic zone) the researchers reconstruct changes in the position of the thermocline ridge that separates the North Equatorial Current from the North Equatorial Countercurrent. This ridge is currently situated just north of the modern ITCZ. The focus is on the last 150,000 years of Earth history. Funding supports education and training of a graduate student as well as involvement of undergraduates and high school students in research.

现有的数据和模式对热带辐合带（ITCZ）如何在不同的边界条件下做出响应提供了一幅令人困惑的画面，ITCZ是热带气候系统的组成部分。这项研究验证了一个假设，即太平洋海洋ITCZ在冰期期间向南移动，甚至可能低于赤道。使用一种创新的方法（测量在透光层底部钙化的南极有孔虫上测量的氧同位素比率），研究人员重建了将北赤道海流与北赤道逆流分开的温跃层脊位置的变化。这个山脊目前位于现代ITCZ的北部。重点是过去15万年的地球历史。资金支持研究生的教育和培训以及本科生和高中生参与研究。