Collaborative Research: RUI: Development of a 700,000 Year Record of Tropical Precipitation, Evaporation, and Temperature from Lake Junin Sediments and Regional Speleothems

合作研究：RUI：根据胡宁湖沉积物和区域洞穴形成 70 万年热带降水、蒸发和温度记录

• 批准号: 2103082
• 负责人: Mark Abbott
• 金额: $ 39.75万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-07-15 至 2025-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2103082&HistoricalAwards=false
• 关键词: Collaborative; Research; RUI; Development; 700

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2).The influence of increasing global temperatures on people and ecosystems varies across the world. In tropical regions, the impact is felt mostly in terms of water availability. Deposits preserved in caves and lakes provide key insights into how tropical environments responded to past climate change. This study will build a 700 thousand year-long record from cave deposits and lake sediments in Peru to understand how a changing global climate affects precipitation, temperature and humidity in the upper reaches of the Amazon Basin. The findings from this work will apply to understanding the impacts of climate change in this region and extend globally, as the Amazon is home to the world’s largest rainforest and an important regulator of the global carbon cycle. This project will integrate researchers at three research universities and one undergraduate liberal arts college. Undergraduate students will interface with graduate students through all aspects of the proposed work, and a postdoctoral fellow will be based at the liberal arts institution and will work with teams at the research universities. In addition, scientists will collaborate with faculty and students in Peru to establish a monitoring program for regional caves, lakes and precipitation, and on a public outreach program aimed at climate change education led by community members. Researchers will expand participation of underrepresented minority students in the Earth sciences through development of a hands-on hydrology and climate change module as part of the University of Michigan Earth Camp, an experiential learning program for high school students.Researchers will combine analyses of a suite of paleoclimate proxies using both the 700,000 year-long Lake Junín sediment record and deposits from nearby caves, to produce a near-continuous, composite record of precipitation-evaporation balance and temperature for the upper Amazon Basin for the last 700,000 years. The National Science Foundation and the International Continental Drilling Program funded the successful collection of the Lake Junín drill core in 2015, and the cave deposits were collected in 2019 using university funds. Researchers will combine the well-dated Lake Junín drill core with a composite speleothem (cave) record dated by precise U-Th geochronology, and will use these archives to build records of precipitation, evaporation, and temperature, that will enable synthesis of our new data with existing records to investigate coupled climate systems in the Amazon Basin (monsoon strength and Atlantic meridional overturning circulation), climate sensitivity under different boundaryconditions, and hydrologic change during periods of large and rapid changes in forcing.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该奖项的全部或部分资金根据《2021 年美国救援计划法案》（公法 117-2）提供。全球气温升高对世界各地的人类和生态系统的影响各不相同，在热带地区，这种影响主要体现在热带地区。洞穴和湖泊中保存的沉积物为了解热带环境如何应对过去的气候变化提供了重要见解。这项研究将从秘鲁的洞穴沉积物和湖泊沉积物中建立长达 70 万年的记录，以了解气候变化是如何变化的。全球气候影响亚马逊盆地上游的降水、温度和湿度，这项研究的结果将有助于了解气候变化对该地区的影响，并扩展到全球范围，因为亚马逊是世界上最大的雨林和热带雨林的所在地。该项目将整合三所研究型大学的研究人员，一所本科生将在拟议工作的各个方面与研究生进行交流，一名博士后将在文学院工作。机构并将与研究型大学的团队合作。此外，科学家将与秘鲁的教师和学生合作，建立一个针对区域洞穴、湖泊和降水的监测计划，并开展一项由社区成员领导的旨在气候变化教育的公共外展计划，研究人员将扩大代表性不足的少数族裔学生的参与。作为密歇根大学地球营（一项针对高中生的体验式学习计划）的一部分，开发了水文学和气候变化实践模块，以了解地球科学。研究人员将使用两种方法结合对一套古气候代理的分析70 万年的胡宁湖沉积物记录和附近洞穴的沉积物，产生了过去 70 万年亚马逊上游盆地降水-蒸发平衡和温度的近乎连续的综合记录。该计划于 2015 年资助了胡宁湖钻芯的成功收集，并利用大学资金于 2019 年收集了洞穴沉积物。年代久远的胡宁湖钻芯，具有通过精确的 U-Th 地质年代学确定的复合洞穴（洞穴）记录，并将使用这些档案来建立降水、蒸发和温度记录，这将使我们的新数据与现有记录相结合旨在研究亚马逊盆地的耦合气候系统（季风强度和大西洋经向翻转环流）、不同边界条件下的气候敏感性，以及强迫发生大而快速变化期间的水文变化。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。