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.

现有的数据和模型描绘了热带辐合带（ITCZ）作为热带气候系统的一个组成部分如何在不同边界条件下做出反应的令人困惑的图景。这项研究检验了太平洋海洋 ITCZ 在冰期期间向南移动，甚至可能移至赤道以下的假设。研究人员使用一种创新方法（测量在透光区底部钙化的浮游有孔虫上测量的氧同位素比率）重建了将北赤道洋流与北赤道逆流分开的温跃层脊的位置变化。该山脊目前位于现代 ITCZ 的北部。重点是地球历史的最后 15 万年。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。