Constraining Holocene lake levels and coastal dune activity in the Lake Michigan basin |
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Authors: | Email author" target="_blank">Timothy?G?FisherEmail author Kelly?A?Weyer Amber?M?Boudreau James?M?Martin-Hayden David?E?Krantz Andy?Breckenridge |
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Institution: | (1) Department of Environmental Sciences, MS-604, University of Toledo, Toledo, OH 43606, USA;(2) Department of Geology, Mercyhurst College, 501 E. 38th St., Erie, PA 16546, USA |
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Abstract: | Sediment cores collected from embayed lakes along the east-central coast of Lake Michigan are used to construct aeolian sand
records of past coastal dune mobility, and to constrain former lake levels in the Lake Michigan basin. Time series analysis
of sand cycles based on the weight-percent aeolian sand within lacustrine sediment, reveals statistically significant spectral
peaks that coincide with established lake level cycles in Lake Michigan and the Gleissberg sunspot cycle of minima. Longer
cycles of ~ 800 and ~ 2200 years were also identified that correspond to solar cycles. Shorter cycles between 80 and 220 years
suggest a link between coastal dune mobility, climate, and lake levels in the Lake Michigan basin. Radiocarbon-dated sedimentary
contacts of lacustrine sediment overlying wetland sediment record the Nipissing transgression in the Lake Michigan basin.
Lake level rise closely mimics the predicted uplift of the North Bay outlet, with lake level rise slowing when outflow was
transferred to the Port Huron/Sarnia outlet. The Nipissing highstand was reached after 5000 cal (4.4 ka) BP. |
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