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TitleRise of Great Lakes surface water, sinking of the upper midwest of the United States, and viscous collapse of the forebulge of the former Laurentide Ice Sheet
 
AuthorArgus, D F; Ratliff, B; DeMets, C; Borsa, A A; Wiese, D N; Blewitt, G; Crowley, J WORCID logo; Martens, H R; Kreemer, C; Landerer, F W
SourceJournal of Geophysical Research, Solid Earth vol. 125, issue 1, e2020JB019739, 2020 p. 1-16, https://doi.org/10.1029/2020JB019739
Image
Year2020
Alt SeriesNatural Resources Canada, Contribution Series 20200461
PublisherBlackwell Publishing Ltd.
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf; html
ProvinceOntario
AreaUnited States of America
Lat/Long WENS -94.0500 -74.9667 51.1500 39.6000
SubjectsScience and Technology; Nature and Environment; environmental geology; water levels; lake water depths; lake water; lakes; watersheds; hydrologic properties; Great Lakes; Great Lakes Basin; Great Lakes Basins; Global positioning systems; Hydrology
Illustrationslocation maps; graphs; diagrams
Released2020 07 31
AbstractGreat Lakes water levels rose 0.7–1.5 m from 2013 to 2019, increasing surface water volume by 285 km3. Solid Earth's elastic response to the increased mass load is nearly known: The Great Lakes floor fell 8–23 mm, and the adjacent land fell 3–14 mm. Correcting GPS measurements for this predicted elastic loading (1) straightens position-time series, making the evolution of position more nearly a constant velocity and (2) reduces estimates of subsidence rate in Wisconsin, Michigan, and southern Ontario by 0.5–2 mm/yr, improving constraints on postglacial rebound. GPS records Wisconsin and Michigan to have subsided at 1–4 mm/yr. We find this sinking to be produced primarily by viscous collapse of the former Laurentide ice sheet forebulge and secondarily by elastic Great Lakes loading. We infer water on land in the Great Lakes watershed to be total water change observed by GRACE minus Great Lakes surface water smeared by a Gaussian distribution. Water stored on land each year reaches a maximum in March, 6 months before Great Lakes water levels peak in September. The seasonal oscillation of water on land in the Great Lakes basin, 100 km3 (0.20 m water thickness), is twice that in a hydrology model. In the seasons, groundwater in the Great Lakes watershed increases by 60 km3 (0.12 m) each autumn and winter and decreases by roughly an equivalent amount each spring and summer. In the long term, groundwater volume remained constant from 2004 to 2012 but increased by 50 km3 (0.10 m) from 2013 to 2019.
GEOSCAN ID327291

 
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