| 项目编号: | 1602791
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| 项目名称: | Collaborative Research: Testing Laurentide Ice Sheet Climate Response and Younger Dryas Trigger with Glacial Varves |
| 作者: | Andrew Breckenridge
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| 承担单位: | University of Wisconsin-Superior
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| 批准年: | 2016
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| 开始日期: | 2016-08-01
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| 结束日期: | 2020-07-31
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| 资助金额: | 146746
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| 资助来源: | US-NSF
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| 项目类别: | Continuing grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Earth Sciences
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| 英文关键词: | younger dryas
; climate
; ice sheet
; rapid climate change
; response
; varve
; former ice sheet
; possible trigger
; glacial varve
; varve thickness dataset
; modern climate change
; future response
; last ice age
; climate cooling
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| 英文摘要: | This project has two objectives. 1) Document the response of the former ice sheet that covered the North American mid-continent to rapid climate changes that occurred at the end of the last ice age. Such a record enhances our ability to predict the response of ice sheets to modern climate change. 2) Test the role of increased freshwater influx to the Atlantic Ocean as a possible trigger for these rapid climate changes, specifically the cold interval known as the Younger Dryas. Modern freshening in the North Atlantic and Arctic Oceans has raised concerns that global warming driven increases in glacier runoff could trigger climate cooling. To evaluate models that use this event to assess the future response of the Atlantic Ocean to predicted freshening, the connections (if any) between freshwater discharge and routing before and during the Younger Dryas need to be resolved.
The primary records that will be generated are varve thickness datasets from a large glacial lake, proximal to the former ice sheet. Glacial varves are yearly sediment couplets that appear similar to tree rings, and as such provide an annually resolvable record of how climate affected the ice sheet. The varves will be recovered by coring sediments from many lakes, spanning a broad region west of Lake Superior. By matching thickness patterns between all sites, a 5000+ year time series is anticipated. Working in collaboration with staff at Voyageurs National Park (Minnesota), this work will be showcased for the general public via a permanent indoor exhibit on varves as records of climate and environmental change. |
| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/91607
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| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
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| Recommended Citation: | |
Andrew Breckenridge. Collaborative Research: Testing Laurentide Ice Sheet Climate Response and Younger Dryas Trigger with Glacial Varves. 2016-01-01.
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