Accomplishment Based Renewal: Hydrologic History of the Indo-Pacific-Warm Pool During the Last 25,000 Years

基于成就的更新：过去 25,000 年印度洋-太平洋-暖池的水文历史

• 批准号: 1060743
• 负责人: Delia Oppo
• 金额: $ 57.5万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-07-15 至 2016-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1060743&HistoricalAwards=false
• 关键词: Accomplishment; Based; Renewal; Hydrologic; History

How the tropical hydrologic cycle is responding and will respond to anthropogenic perturbations is unclear. Records of past change recorded in marine sediments offer one important avenue to explore how tropical climate responds to changes in a range of surface boundary conditions, and the mechanisms that cause these changes.A researcher from the Woods Hole Oceanographic Institution in Massachusetts will examine the response of the tropical hydrologic cycle to a range of boundary conditions during the last 25,000 years, focusing on the Indo-Pacific region. This geographic area includes the Indo-Pacific Warm Pool (IPWP), the largest reservoir of warm surface water on earth, the major source of heat for the global atmosphere, and a location of deep atmospheric convection and heavy rainfall. Previous work by this researcher has shown that small variations in sea surface temperature of the IPWP can perturb planetary scale atmospheric circulation and atmospheric heating globally. This project will generate records of hydrologic change from core sites within the IPWP using compound-specific hydrogen and carbon isotopes of terrestrial long-chain leaf-wax fatty acids. Within the time period of interest, there will be a particular focus on abrupt, millennial-scale changes (Heinrich Event 1 and the Younger Dryas) and the last 2,000 years. This project builds on a large body of previous work carried out by this researcher and her colleagues, and continues collaborations with organic geochemists and climate modelers for a robust and multi-faceted approach to understanding the tropical hydrologic cycle. Funding will support a postdoctoral researcher, and provide opportunities for undergraduate and high school students involvement in marine research.

热带水文循环如何响应以及将如何响应人为扰动尚不清楚。海洋沉积物中记录的过去变化记录为探索热带气候如何响应一系列地表边界条件的变化以及导致这些变化的机制提供了一个重要途径。马萨诸塞州伍兹霍尔海洋研究所的一名研究人员将研究过去25,000年来热带水文循环对一系列边界条件的响应，重点关注印度-太平洋地区。该地理区域包括印度太平洋暖池（IPWP），它是地球上最大的地表温暖水库，是全球大气的主要热源，也是深层大气对流和强降雨的所在地。该研究人员之前的工作表明，IPWP 海面温度的微小变化可能会扰乱全球范围内的行星尺度大气环流和大气加热。该项目将使用陆地长链叶蜡脂肪酸的化合物特定氢和碳同位素，从 IPWP 内的核心站点生成水文变化记录。在感兴趣的时间段内，将特别关注千禧年规模的突变（海因里希事件 1 和新仙女木期）和过去 2000 年。该项目建立在该研究人员及其同事之前进行的大量工作的基础上，并继续与有机地球化学家和气候建模师合作，以采用稳健和多方面的方法来了解热带水文循环。资金将支持一名博士后研究员，并为本科生和高中生参与海洋研究提供机会。