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

热带水文循环现在和将来如何对人为扰动作出反应尚不清楚。海洋沉积物中记录的过去变化为探索热带气候如何响应一系列表面边界条件的变化以及引起这些变化的机制提供了一条重要途径。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25000年来热带水文循环对一系列边界条件的反应，重点是印度-太平洋地区。这一地理区域包括印度-太平洋暖池（IPWP），它是地球上最大的温暖地表水储存库，是全球大气的主要热源，也是深大气对流和强降雨的位置。该研究人员之前的工作表明，IPWP海洋表面温度的微小变化可以扰乱全球行星尺度的大气环流和大气加热。该项目将利用陆生长链叶蜡脂肪酸的化合物特异性氢和碳同位素，生成IPWP内核心地点的水文变化记录。在感兴趣的时间段内，将特别关注千年尺度的突变（海因里希事件1和新仙女木事件）和过去2000年。该项目建立在该研究人员和她的同事之前开展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者合作，以建立一个强大的、多方面的方法来理解热带水文循环。该基金将资助一名博士后研究员，并为本科生和高中生提供参与海洋研究的机会。

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.