Testing the Hypothesis of Eastward Lake Agassiz Discharge at the Beginning of the Younger Dryas using Marine Seismic-Reflection Methods

使用海洋地震反射方法检验新仙女木期开始时阿加西湖向东放电的假设

• 批准号: 0623607
• 负责人: Steven Colman
• 金额: --
• 依托单位: University of Minnesota Duluth
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-15 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0623607&HistoricalAwards=false
• 关键词: Testing; Hypothesis; Eastward; Lake; Agassiz

0623607ColemanAbstractThe work will produce a high-resolution seismic stratigraphic record from Lake Superior at both the Nipigon and Thunder Bay areas. The former is to verify seismic-stratigraphic evidence of major eastward outflow of Lake Agassiz near the end of the Younger Dryas. The latter is to determine if outflow sediment deposits are present or not in the Thunder Bay area, that might have resulted from catastrophic eastward discharge. If such deposits are identified, these are likely to have been found in the earliest Younger Dryas episode, hence supporting the hypothesis of massive eastward fresh water flow triggering the Younger Dryas cooling. The work will impact studies of abrupt climate change (which is inherently relevant and important to societal interests) and to studies of marine science in the Great lakes. Public outreach is also planned on a topic that is both scientifically important and of interest to the general public. Educational outreach effort will include a website and interactions with Minnesota Sea Grant and other organizations.

这项工作将产生尼皮贡和桑德湾地区苏必利尔湖的高分辨率地震地层记录。前者是为了验证新仙女木期末期阿加西湖主要向东流出的地震地层证据。后者是为了确定桑德湾地区是否存在流出沉积物沉积物，这可能是由灾难性的向东排放造成的。如果这些沉积物被确定，它们很可能是在新仙女木时期早期发现的，因此支持了大量向东流动的淡水引发新仙女木时期冷却的假设。这项工作将影响气候突变的研究（这对社会利益具有内在的相关性和重要性）和五大湖的海洋科学研究。还计划就一个既具有科学重要性又与公众感兴趣的主题进行公众宣传。教育推广工作将包括一个网站以及与明尼苏达海洋基金和其他组织的互动。