Mass Gains of the Antarctic Ice Sheet Exceed Losses
During 2003 to 2008, the mass gain of the Antarctic ice sheet from snow accumulation exceeded the mass loss from ice discharge by 49 Gt/yr (2.5% of input), as derived from ICESat laser measurements of elevation change. The net gain (86 Gt/yr) over the West Antarctic (WA) and East Antarctic ice sheet...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20120013495 2023-05-15T13:33:56+02:00 Mass Gains of the Antarctic Ice Sheet Exceed Losses Robbins, John Bromwich, David Li, Jun Saba, Jack L. Brenner, Anita Yi, Donghui Zwally, H. Jay Unclassified, Unlimited, Publicly available July 14, 2012 application/pdf http://hdl.handle.net/2060/20120013495 unknown Document ID: 20120013495 http://hdl.handle.net/2060/20120013495 Copyright, Distribution as joint owner in the copyright CASI Meteorology and Climatology GSFC.ABS.6573.2012 ISMASS (Ice-Sheet Mass Balance and Sea Level) Workshop of SCAR Scientific Committee on Antarctic Research; 14 Jul. 2012; Portland, OR; United States 2012 ftnasantrs 2019-07-21T00:47:48Z During 2003 to 2008, the mass gain of the Antarctic ice sheet from snow accumulation exceeded the mass loss from ice discharge by 49 Gt/yr (2.5% of input), as derived from ICESat laser measurements of elevation change. The net gain (86 Gt/yr) over the West Antarctic (WA) and East Antarctic ice sheets (WA and EA) is essentially unchanged from revised results for 1992 to 2001 from ERS radar altimetry. Imbalances in individual drainage systems (DS) are large (-68% to +103% of input), as are temporal changes (-39% to +44%). The recent 90 Gt/yr loss from three DS (Pine Island, Thwaites-Smith, and Marie-Bryd Coast) of WA exceeds the earlier 61 Gt/yr loss, consistent with reports of accelerating ice flow and dynamic thinning. Similarly, the recent 24 Gt/yr loss from three DS in the Antarctic Peninsula (AP) is consistent with glacier accelerations following breakup of the Larsen B and other ice shelves. In contrast, net increases in the five other DS of WA and AP and three of the 16 DS in East Antarctica (EA) exceed the increased losses. Alternate interpretations of the mass changes driven by accumulation variations are given using results from atmospheric-model re-analysis and a parameterization based on 5% change in accumulation per degree of observed surface temperature change. A slow increase in snowfall with climate waRMing, consistent with model predictions, may be offsetting increased dynamic losses. Other/Unknown Material Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Ice Shelves Pine Island NASA Technical Reports Server (NTRS) Antarctic The Antarctic Antarctic Peninsula East Antarctica |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Meteorology and Climatology |
spellingShingle |
Meteorology and Climatology Robbins, John Bromwich, David Li, Jun Saba, Jack L. Brenner, Anita Yi, Donghui Zwally, H. Jay Mass Gains of the Antarctic Ice Sheet Exceed Losses |
topic_facet |
Meteorology and Climatology |
description |
During 2003 to 2008, the mass gain of the Antarctic ice sheet from snow accumulation exceeded the mass loss from ice discharge by 49 Gt/yr (2.5% of input), as derived from ICESat laser measurements of elevation change. The net gain (86 Gt/yr) over the West Antarctic (WA) and East Antarctic ice sheets (WA and EA) is essentially unchanged from revised results for 1992 to 2001 from ERS radar altimetry. Imbalances in individual drainage systems (DS) are large (-68% to +103% of input), as are temporal changes (-39% to +44%). The recent 90 Gt/yr loss from three DS (Pine Island, Thwaites-Smith, and Marie-Bryd Coast) of WA exceeds the earlier 61 Gt/yr loss, consistent with reports of accelerating ice flow and dynamic thinning. Similarly, the recent 24 Gt/yr loss from three DS in the Antarctic Peninsula (AP) is consistent with glacier accelerations following breakup of the Larsen B and other ice shelves. In contrast, net increases in the five other DS of WA and AP and three of the 16 DS in East Antarctica (EA) exceed the increased losses. Alternate interpretations of the mass changes driven by accumulation variations are given using results from atmospheric-model re-analysis and a parameterization based on 5% change in accumulation per degree of observed surface temperature change. A slow increase in snowfall with climate waRMing, consistent with model predictions, may be offsetting increased dynamic losses. |
format |
Other/Unknown Material |
author |
Robbins, John Bromwich, David Li, Jun Saba, Jack L. Brenner, Anita Yi, Donghui Zwally, H. Jay |
author_facet |
Robbins, John Bromwich, David Li, Jun Saba, Jack L. Brenner, Anita Yi, Donghui Zwally, H. Jay |
author_sort |
Robbins, John |
title |
Mass Gains of the Antarctic Ice Sheet Exceed Losses |
title_short |
Mass Gains of the Antarctic Ice Sheet Exceed Losses |
title_full |
Mass Gains of the Antarctic Ice Sheet Exceed Losses |
title_fullStr |
Mass Gains of the Antarctic Ice Sheet Exceed Losses |
title_full_unstemmed |
Mass Gains of the Antarctic Ice Sheet Exceed Losses |
title_sort |
mass gains of the antarctic ice sheet exceed losses |
publishDate |
2012 |
url |
http://hdl.handle.net/2060/20120013495 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic The Antarctic Antarctic Peninsula East Antarctica |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula East Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Ice Shelves Pine Island |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica East Antarctica Ice Sheet Ice Shelves Pine Island |
op_source |
CASI |
op_relation |
Document ID: 20120013495 http://hdl.handle.net/2060/20120013495 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766047306998611968 |