DOI: 10.1016/j.quascirev.2015.04.009
Scopus记录号: 2-s2.0-84928553671
论文题名: The Tintah-Campbell gap and implications for glacial Lake Agassiz drainage during the Younger Dryas cold interval
作者: Breckenridge A.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 117 起始页码: 124
结束页码: 134
语种: 英语
英文关键词: Lake agassiz
; Lidar
; Strandlines
; Younger dryas
Scopus关键词: Glacial geology
; Optical radar
; Digital elevation model
; Glacial Isostatic Adjustments
; Glacial Lake Agassiz
; Lake agassiz
; Laurentian Great Lakes
; Laurentide ice sheets
; Strandlines
; Younger Dryas
; Lakes
英文摘要: Reconstructions of glacial Lake Agassiz paleogeography and drainage have been an important contribution to formulating a hypothesis in which glacial Lake Agassiz drainage to the Atlantic Ocean initiated the Younger Dryas cold interval. This study evaluates the lake level and outlet history of Lake Agassiz as recorded by strandlines visible on lidar digital elevation models from North Dakota and Minnesota. The former lake levels are warped due to glacial isostatic adjustment. Older levels have experienced more uplift and therefore have more curvature. The strandline data establish that the Moorhead lowstand of Lake Agassiz was bracketed by the strongly diverging Campbell and Tintah lake levels, which creates a vertical gap between the former lake levels. This gap exists due to a lake level drop of ~90m when the Laurentide Ice Sheet retreat opened a lower outlet, which must have been a northwest outlet to the Arctic Ocean. By applying an exponential decay rebound model, this event dates to 12,180±480calyrBP, post-dating the beginning of the Younger Dryas at 12,900calyrBP. Eastern drainage outlets to the Atlantic Ocean through the Laurentian Great Lakes that were contemporaneous with the onset of the Younger Dryas cannot be ruled out, but if these outlets existed, their duration of occupation was short-lived and not characterized by significant drawdown events within glacial Lake Agassiz. © 2015 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59931
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Natural Sciences, University of Wisconsin-Superior, United States
Recommended Citation:
Breckenridge A.. The Tintah-Campbell gap and implications for glacial Lake Agassiz drainage during the Younger Dryas cold interval[J]. Quaternary Science Reviews,2015-01-01,117