(www.interscience.wiley.com) DOI:10.1002/hyp.7343 Hydrologic drainage of the Greenland Ice Sheet
A simple hydrologic drainage network for the Greenland Ice Sheet is modelled from available digital elevation models (DEMs) of bedrock, and surface topography and assumptions of hydrostatic water pressure, uniform hydraulic conductivity, and no conduit flow within the ice sheet. As such, it is a fir...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.546.2252 2023-05-15T16:27:10+02:00 (www.interscience.wiley.com) DOI:10.1002/hyp.7343 Hydrologic drainage of the Greenland Ice Sheet Sarah M. Lewis Laurence C. Smith The Pennsylvania State University CiteSeerX Archives 2009 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.546.2252 http://www.sscnet.ucla.edu/geog/downloads/297/356.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.546.2252 http://www.sscnet.ucla.edu/geog/downloads/297/356.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.sscnet.ucla.edu/geog/downloads/297/356.pdf text 2009 ftciteseerx 2016-01-08T11:17:54Z A simple hydrologic drainage network for the Greenland Ice Sheet is modelled from available digital elevation models (DEMs) of bedrock, and surface topography and assumptions of hydrostatic water pressure, uniform hydraulic conductivity, and no conduit flow within the ice sheet. As such, it is a first-order model best suited for broad-scale hydrological assessment. Results identify 293 distinct hydrologic basins (185–117 000 km2) together with their ‘realized ’ (wet) and ‘unrealized’ (dry) drainage patterns. Intersection with 1991–2000 Polar MM5 (PMM5) mesoscale climate model hindcasts of meltwater runoff suggest that these basins route varying amounts of water to the ice edge, ranging from 0 to 16 km3 annually and totalling 242 km3/year for the entire ice sheet. Regionally speaking, average annual volumetric meltwater production (km3/year) is highest in southwest and lowest in northeast Greenland, with greater hydrologic activity in western regions than in eastern regions for a given latitude. The extent to which meltwater truly reaches the ice margin as modelled is difficult to test. However, the simulated flow outlet locations show qualitative agreement with the locations of 460 observed meltwater outlets (proglacial lakes, streams, and rivers; and sediment plumes into fjörds) mapped continuously along the ice sheet perimeter. On average, about 36 % of the modelled drainage network was activated (i.e. received water) over the 1991–2000 study period. Remaining areas, barring dynamic changes to ice-surface topography, would presumably Text Greenland Ice Sheet Unknown Greenland |
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English |
description |
A simple hydrologic drainage network for the Greenland Ice Sheet is modelled from available digital elevation models (DEMs) of bedrock, and surface topography and assumptions of hydrostatic water pressure, uniform hydraulic conductivity, and no conduit flow within the ice sheet. As such, it is a first-order model best suited for broad-scale hydrological assessment. Results identify 293 distinct hydrologic basins (185–117 000 km2) together with their ‘realized ’ (wet) and ‘unrealized’ (dry) drainage patterns. Intersection with 1991–2000 Polar MM5 (PMM5) mesoscale climate model hindcasts of meltwater runoff suggest that these basins route varying amounts of water to the ice edge, ranging from 0 to 16 km3 annually and totalling 242 km3/year for the entire ice sheet. Regionally speaking, average annual volumetric meltwater production (km3/year) is highest in southwest and lowest in northeast Greenland, with greater hydrologic activity in western regions than in eastern regions for a given latitude. The extent to which meltwater truly reaches the ice margin as modelled is difficult to test. However, the simulated flow outlet locations show qualitative agreement with the locations of 460 observed meltwater outlets (proglacial lakes, streams, and rivers; and sediment plumes into fjörds) mapped continuously along the ice sheet perimeter. On average, about 36 % of the modelled drainage network was activated (i.e. received water) over the 1991–2000 study period. Remaining areas, barring dynamic changes to ice-surface topography, would presumably |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Sarah M. Lewis Laurence C. Smith |
spellingShingle |
Sarah M. Lewis Laurence C. Smith (www.interscience.wiley.com) DOI:10.1002/hyp.7343 Hydrologic drainage of the Greenland Ice Sheet |
author_facet |
Sarah M. Lewis Laurence C. Smith |
author_sort |
Sarah M. Lewis |
title |
(www.interscience.wiley.com) DOI:10.1002/hyp.7343 Hydrologic drainage of the Greenland Ice Sheet |
title_short |
(www.interscience.wiley.com) DOI:10.1002/hyp.7343 Hydrologic drainage of the Greenland Ice Sheet |
title_full |
(www.interscience.wiley.com) DOI:10.1002/hyp.7343 Hydrologic drainage of the Greenland Ice Sheet |
title_fullStr |
(www.interscience.wiley.com) DOI:10.1002/hyp.7343 Hydrologic drainage of the Greenland Ice Sheet |
title_full_unstemmed |
(www.interscience.wiley.com) DOI:10.1002/hyp.7343 Hydrologic drainage of the Greenland Ice Sheet |
title_sort |
(www.interscience.wiley.com) doi:10.1002/hyp.7343 hydrologic drainage of the greenland ice sheet |
publishDate |
2009 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.546.2252 http://www.sscnet.ucla.edu/geog/downloads/297/356.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
http://www.sscnet.ucla.edu/geog/downloads/297/356.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.546.2252 http://www.sscnet.ucla.edu/geog/downloads/297/356.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766016253064904704 |