Development of Precipitation, Evaporation and Temperature Records from Tropical Lake Sediments and Cave Deposits for the last 700,000 years

过去 70 万年热带湖泊沉积物和洞穴沉积物的降水、蒸发和温度记录的发展

• 批准号: 2102843
• 负责人: Naomi Levin
• 金额: $ 33.14万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 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 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2102843&HistoricalAwards=false
• 关键词: Development; Precipitation; Evaporation; Temperature; Records

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.

该奖项是根据2021年《美国救援计划法》（公法117-2）全部或部分资助的。全球对人和生态系统的日益增加的影响在世界各地各不相同。在热带地区，这种影响主要是在水上可用性方面感受到的。保存在洞穴和湖泊中的沉积物为热带环境如何应对过去气候变化的反应提供了关键的见解。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，以了解不断变化的全球气候如何影响亚马逊盆地上游的精度，温度和湿度。这项工作的发现将适用于了解该地区气候变化的影响并在全球范围内扩展，因为亚马逊是世界上最大的雨林和全球碳循环的重要调节者的家园。该项目将整合三所研究大学和一所本科文科学院的研究人员。本科生将通过拟议工作的各个方面与研究生互动，博士后研究员将位于文科机构，并将与研究大学的团队合作。此外，科学家将与秘鲁的教师和学生合作，为区域洞穴，湖泊和降水制定监测计划，以及针对社区成员领导的气候变化教育的公共外展计划。研究人员将通过开发动手的水文学和气候变化模块作为密歇根大学地球营地的一部分，扩大代表性不足的少数族裔学生在地球科学中的参与，这是一项针对高中生的专家学习计划。研究人员将结合对700,000年少年录音的古rigate唱片的分析。在过去的700，000年中，亚马逊上盆地的降水蒸发平衡和温度。国家科学基金会和国际大陆钻探计划在2015年成功地收集了朱恩湖钻头，并使用大学资金于2019年收集了洞穴矿床。 Researchers will combine the well-dated Lake Junín drill core with a composite speleothem (cave) record dated by precision U-Th geochronology, and will use these archives to build records of precision, economy, 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 circle), climate sensitivity under different boundary conditions, and该奖项反映了NSF的法定任务，并通过使用基金会的知识分子优点和更广泛的影响标准来评估，反映了NSF的法定任务。

项目成果

Detecting hydrologic distinctions among Andean lakes using clumped and triple oxygen isotopes

使用簇同位素和三氧同位素检测安第斯山脉湖泊之间的水文差异

• DOI: 10.1016/j.epsl.2022.117927
• 发表时间: 2023
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Katz, Sarah A.;Levin, Naomi E.;Rodbell, Donald T.;Gillikin, David P.;Aron, Phoebe G.;Passey, Benjamin H.;Tapia, Pedro M.;Serrepe, Analucía R.;Abbott, Mark B.
• 通讯作者: Abbott, Mark B.