Collaborative Research: Understanding Sensitivity of Great Lakes Water Levels to Climatic Forcing

合作研究：了解五大湖水位对气候强迫的敏感性

• 批准号: 0355162
• 负责人: David Rea
• 金额: $ 11.94万
• 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: 2004
• 资助国家: 美国
• 起止时间: 2004-06-01 至 2007-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0355162&HistoricalAwards=false
• 关键词: Collaborative; Research; Understanding; Sensitivity; Great

This award supports a study of the Great Lakes between 9,400 - 7,700 calendar years Before Present (BP). The study is composed of three primary components; correlating Great Lake low water stands, evaluating paleoclimate variability using multi-proxy data to determine past atmospheric conditions, and reconstructing the paleogeography to model climatic and hydrologic conditions in the area. The researchers hypothesize that lake levels were below their present levels after 9,000 cal BP due to the combined effects of the southward incursion of dry Arctic air and the increase of eastern warm-dry Pacific air. This would allow for the eastern expansion of prairie vegetation and may have delayed the recovery of the Great Lakes from a closed to an open system until 7,800 cal BP. This research will increase our understanding of the relation between climate change and water levels in the Great Lakes. Lake level changes have broad socio-economic and environmental impacts so it is important to understand how and why they change.

该奖项支持对距今9,400-7,700历年之间的五大湖的研究(BP)。这项研究由三个主要部分组成：大湖低水位对比，利用多代理数据评估古气候变异性以确定过去的大气条件，以及重建古地理以模拟该地区的气候和水文条件。研究人员推测，在9000卡BP之后，由于北极干燥空气的南下入侵和东部温暖干燥的太平洋空气增加的综合影响，湖泊水位低于目前的水平。这将允许草原植被向东扩张，并可能将五大湖从封闭系统恢复到开放系统的时间推迟到7800卡BP。这项研究将增加我们对气候变化和五大湖水位之间关系的理解。湖泊水位的变化具有广泛的社会经济和环境影响，因此了解这些变化的方式和原因十分重要。