Collaborative Research: Quantifying precipitation changes in the South American subtropics over the late Pleistocene

合作研究：量化南美亚热带晚更新世降水变化

基本信息

批准号：
1702588
负责人：
William McGee
金额：
$ 20.46万
依托单位：
Massachusetts Institute of Technology
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2017
资助国家：
美国
起止时间：
2017-06-01 至 2021-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1702588&HistoricalAwards=false
关键词：
Collaborative Research Quantifying precipitation changes

项目摘要

Many regions of the world, including the Americas, are experiencing drought and its political consequences. The critical question is why, and are the causes natural or man-made? The answer to this and other questions will help us plan for what is ahead, as some regions of the planet continue to warm and dry. This project will focus on the central Andes of South America- a region that is both politically fragile and recently drought stricken. The aim is to study the interplay of temperature and drought in the past, for clues to their probable connections in the future. The main purpose of the project is to create a map of changes in the sizes of ancient lakes in the central Andes, giant ancestors to modern lakes in the region such as Lake Titicaca. Well-preserved shorelines mark the extent of these ancient lakes, and using state-of-the art techniques, the age of these features can be determined. The mapping and dating is vital to relating lake size (and therefore rainfall amounts in the past) to the changing temperature state of the planet, which is well known from other records. In short, these reconstructions will help scientists to better understand how rainfall in this region will change in the coming decades to centuries.This award is cofunded by the Paleo Perspectives on Climate Change Program and the Office of International Science and Engineering.

包括美洲在内的世界许多地区正在经历干旱及其政治后果。关键问题是为什么，原因是自然的还是人为的？随着地球上一些地区继续变暖和干燥，这个问题和其他问题的答案将帮助我们规划未来的发展。该项目将重点关注南美洲安第斯山脉中部，该地区政治脆弱且最近遭受干旱。目的是研究过去温度和干旱的相互作用，为它们未来可能的联系提供线索。该项目的主要目的是绘制安第斯山脉中部古代湖泊大小变化的地图，这些湖泊是该地区现代湖泊（如的的喀喀湖）的巨型祖先。保存完好的海岸线标志着这些古老湖泊的范围，利用最先进的技术，可以确定这些特征的年龄。测绘和测年对于将湖泊大小（以及过去的降雨量）与地球不断变化的温度状态联系起来至关重要，这一点从其他记录中众所周知。简而言之，这些重建将帮助科学家更好地了解该地区的降雨量在未来几十年到几个世纪内将如何变化。该奖项由古气候变化展望计划和国际科学与工程办公室共同资助。