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: 0355217
• 负责人: David Dettman
• 金额: $ 2.49万
• 依托单位: University of Arizona
• 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=0355217&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 (BP) 9,400 - 7,700 日历年之间的五大湖进行研究。 该研究由三个主要部分组成；关联大湖低水位，使用多代理数据评估古气候变化以确定过去的大气条件，并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，由于北极干燥空气向南入侵和东部暖干太平洋空气增加的综合影响，湖泊水位在 9,000 cal BP 之后低于目前的水平。 这将使草原植被向东部扩张，并可能推迟五大湖从封闭系统向开放系统的恢复，直到 7,800 cal BP。 这项研究将加深我们对气候变化与五大湖水位之间关系的了解。 湖泊水位变化具有广泛的社会经济和环境影响，因此了解其变化方式和原因非常重要。