Ice sheet–derived submarine groundwater discharge on Greenland's continental shelf
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‰...
Published in: | Water Resources Research |
---|---|
Main Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2011
|
Subjects: | |
Online Access: | https://hdl.handle.net/1912/4767 |
id |
ftwhoas:oai:darchive.mblwhoilibrary.org:1912/4767 |
---|---|
record_format |
openpolar |
spelling |
ftwhoas:oai:darchive.mblwhoilibrary.org:1912/4767 2023-05-15T16:27:22+02:00 Ice sheet–derived submarine groundwater discharge on Greenland's continental shelf DeFoor, Whitney Person, Mark Larsen, Hans Christian Lizarralde, Daniel Cohen, Denis Dugan, Brandon 2011-07-28 application/pdf https://hdl.handle.net/1912/4767 en_US eng American Geophysical Union https://doi.org/10.1029/2011WR010536 Water Resources Research 47 (2011): W07549 https://hdl.handle.net/1912/4767 doi:10.1029/2011WR010536 Water Resources Research 47 (2011): W07549 doi:10.1029/2011WR010536 Greenland Freshwater emplacement Hydrogeology Ice sheet Submarine discharge Article 2011 ftwhoas https://doi.org/10.1029/2011WR010536 2022-05-28T22:58:27Z 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. Article in Journal/Newspaper Greenland Ice Sheet Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Greenland Water Resources Research 47 7 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Greenland Freshwater emplacement Hydrogeology Ice sheet Submarine discharge |
spellingShingle |
Greenland Freshwater emplacement Hydrogeology Ice sheet Submarine discharge DeFoor, Whitney Person, Mark Larsen, Hans Christian Lizarralde, Daniel Cohen, Denis Dugan, Brandon Ice sheet–derived submarine groundwater discharge on Greenland's continental shelf |
topic_facet |
Greenland Freshwater emplacement Hydrogeology Ice sheet Submarine discharge |
description |
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. |
format |
Article in Journal/Newspaper |
author |
DeFoor, Whitney Person, Mark Larsen, Hans Christian Lizarralde, Daniel Cohen, Denis Dugan, Brandon |
author_facet |
DeFoor, Whitney Person, Mark Larsen, Hans Christian Lizarralde, Daniel Cohen, Denis Dugan, Brandon |
author_sort |
DeFoor, Whitney |
title |
Ice sheet–derived submarine groundwater discharge on Greenland's continental shelf |
title_short |
Ice sheet–derived submarine groundwater discharge on Greenland's continental shelf |
title_full |
Ice sheet–derived submarine groundwater discharge on Greenland's continental shelf |
title_fullStr |
Ice sheet–derived submarine groundwater discharge on Greenland's continental shelf |
title_full_unstemmed |
Ice sheet–derived submarine groundwater discharge on Greenland's continental shelf |
title_sort |
ice sheet–derived submarine groundwater discharge on greenland's continental shelf |
publisher |
American Geophysical Union |
publishDate |
2011 |
url |
https://hdl.handle.net/1912/4767 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Water Resources Research 47 (2011): W07549 doi:10.1029/2011WR010536 |
op_relation |
https://doi.org/10.1029/2011WR010536 Water Resources Research 47 (2011): W07549 https://hdl.handle.net/1912/4767 doi:10.1029/2011WR010536 |
op_doi |
https://doi.org/10.1029/2011WR010536 |
container_title |
Water Resources Research |
container_volume |
47 |
container_issue |
7 |
_version_ |
1766016527611461632 |