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unknown
Ice sheet–derived submarine groundwater discharge on Greenland's continental shelf
Authors
Bense
Bowman
+56 more
Brandon Dugan
Cohen
Cuffey
Cuffey
Dahl-Jensen
Daniel Lizarralde
Denis Cohen
Engelhardt
Fisher
Fisher
Flowers
Freeze
Garven
Gerber
Gieskes
Gingerich
Hanna
Hans Christian Larsen
Hood
Hooke
Hooke
Hooyer
Hopper
Hubbert
Imbrie
Ingebritsen
Izuka
Johnsen
Joughin
Keller
Kestin
Knight
Lange
Larsen
Le Brocq
Lemieux
Ma
Makahnouk
Mark Person
Marshall
McIntosh
McKenzie
Norton
Parizek
Person
Person
Siegel
Souchez
Souza
Spinelli
Talbot
Tarasov
van den Broeke
Vialov
Wessel
Whitney DeFoor
Publication date
28 July 2011
Publisher
'American Geophysical Union (AGU)'
Doi
Cite
Abstract
Author Posting. © American Geophysical Union, 2011. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Water Resources Research 47 (2011): W07549, doi:10.1029/2011WR010536.Isotopically light (−1‰ to −8‰ δ18O) and fresh pore fluids (300–520 mM Cl−) were found in continental shelf sediments up to 100 km offshore of southeastern (SE) Greenland, suggesting infiltration and mixing of ice sheet meltwater with seawater to depths of 260 m. These geochemical anomalies may be associated with ice sheet–derived submarine groundwater discharge (SMGD). We present a continental-scale reconstruction of the late Pleistocene hydrogeology of SE Greenland using finite element analysis that incorporates ice sheet loading and solute and isotope transport. Results indicate that subglacial infiltration and SMGD are of the same order of magnitude and are highly dependent on the permeability of the subaerial basalt. Simulated infiltration and SMGD almost doubled during the Last Glacial Maximum, compared to ice-free conditions. Much of the present-day glacially induced groundwater discharge occurs on land. Subice infiltration on the continental shelf likely represents a mixture of seawater and meltwater during past glacial maximums. Simulated SMGD during the most recent interval of glacial retreat is about 4% of the total ice sheet melting. At present, the simulated rate of SMGD is about 11% of the estimated current melting rate.This work was supported by an NSF ocean science grant OCE-0824263 to Brandon Dugan, Mark Person, and Dan Lizarralde
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Last time updated on 01/04/2019
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