Surface Elevation Changes in West Antarctica from Satellite Altimetry: Mass Balance Implications
Time-series of surface elevation change, which are constructed from 7-years (1992-1999) of ERS-1 and 2 satellite radar altimeter data of Antarctica, show significant seasonal, inter-annual, and long-term changes. Elevation time-series are created from altimeter crossovers among 90-day data periods o...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20010095012 2023-05-15T14:03:46+02:00 Surface Elevation Changes in West Antarctica from Satellite Altimetry: Mass Balance Implications Cornejo, Helen Koblinsky, Chester J. Brenner, Anita C. Zwally, H. Jay Unclassified, Unlimited, Publicly available [2001] application/pdf http://hdl.handle.net/2060/20010095012 unknown Document ID: 20010095012 http://hdl.handle.net/2060/20010095012 No Copyright CASI Earth Resources and Remote Sensing 2001 ftnasantrs 2015-03-15T02:28:39Z Time-series of surface elevation change, which are constructed from 7-years (1992-1999) of ERS-1 and 2 satellite radar altimeter data of Antarctica, show significant seasonal, inter-annual, and long-term changes. Elevation time-series are created from altimeter crossovers among 90-day data periods on a 50 km grid to 81.5 degrees S and fit with a multivariate linear/sinusoidal function to give the average rate of elevation change (dH/dt) and account for seasonal changes. On the major Ronne, Filchner, and Ronne ice shelves, the dH/dt are small or near zero. In contrast, the ice shelves of the Antarctic Peninsula and along the West Antarctic coast appear to be thinning significantly, with a 23 +/- 3 cm a(exp -1) surface elevation decrease on the Larsen ice shelf and a 65 +/- 4 cm a(exp -1) decrease on the Dotson ice shelf. Significant elevation decreases are obtained over most of the drainage basins of the Pine Island and Thwaites glaciers. Significant increases are obtained over most of the other grounded ice in Marie Byrd Land, the Antarctic Peninsula, and Coates Land. Over the sector from 85 degrees W to 115 degrees W, which includes the Pine Island and Thwaites basins, the average elevation is significantly decreasing by 8.1 cm a(exp -1). The corresponding ice thickness change is about -11 cm a(exp -1), with a corresponding mass loss of 82 Gt a(exp -1), and a 0.22 mm a(exp -1) contribution to global sea level rise. In terms of elevation change, the decrease in the Pine Island-Thwaites sector is largely balanced by the increase in the Marie Byrd Land, but only balanced by about 1/4 in terms of ice thickness change and contribution to sea level rise. The overall average elevation change for the grounded ice is + 1.2 cm a(exp -1). Using an average bedrock uplift of 2.5 cm a(exp -1), implies an average ice thickness decrease of 1.3 cm a(exp -1), a mass loss of 22 Gt a(exp -1), and a 0.06 mm a(exp -1) contribution to global sea level rise. Other/Unknown Material Antarc* Antarctic Antarctic Peninsula Antarctica Coates Land Dotson Ice Shelf Ice Shelf Ice Shelves Larsen Ice Shelf Marie Byrd Land Pine Island West Antarctica NASA Technical Reports Server (NTRS) Antarctic Antarctic Peninsula Byrd Coates ENVELOPE(162.083,162.083,-77.800,-77.800) Dotson Ice Shelf ENVELOPE(-112.367,-112.367,-74.400,-74.400) Larsen Ice Shelf ENVELOPE(-62.500,-62.500,-67.500,-67.500) Marie Byrd Land ENVELOPE(-130.000,-130.000,-78.000,-78.000) The Antarctic West Antarctica |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Earth Resources and Remote Sensing |
spellingShingle |
Earth Resources and Remote Sensing Cornejo, Helen Koblinsky, Chester J. Brenner, Anita C. Zwally, H. Jay Surface Elevation Changes in West Antarctica from Satellite Altimetry: Mass Balance Implications |
topic_facet |
Earth Resources and Remote Sensing |
description |
Time-series of surface elevation change, which are constructed from 7-years (1992-1999) of ERS-1 and 2 satellite radar altimeter data of Antarctica, show significant seasonal, inter-annual, and long-term changes. Elevation time-series are created from altimeter crossovers among 90-day data periods on a 50 km grid to 81.5 degrees S and fit with a multivariate linear/sinusoidal function to give the average rate of elevation change (dH/dt) and account for seasonal changes. On the major Ronne, Filchner, and Ronne ice shelves, the dH/dt are small or near zero. In contrast, the ice shelves of the Antarctic Peninsula and along the West Antarctic coast appear to be thinning significantly, with a 23 +/- 3 cm a(exp -1) surface elevation decrease on the Larsen ice shelf and a 65 +/- 4 cm a(exp -1) decrease on the Dotson ice shelf. Significant elevation decreases are obtained over most of the drainage basins of the Pine Island and Thwaites glaciers. Significant increases are obtained over most of the other grounded ice in Marie Byrd Land, the Antarctic Peninsula, and Coates Land. Over the sector from 85 degrees W to 115 degrees W, which includes the Pine Island and Thwaites basins, the average elevation is significantly decreasing by 8.1 cm a(exp -1). The corresponding ice thickness change is about -11 cm a(exp -1), with a corresponding mass loss of 82 Gt a(exp -1), and a 0.22 mm a(exp -1) contribution to global sea level rise. In terms of elevation change, the decrease in the Pine Island-Thwaites sector is largely balanced by the increase in the Marie Byrd Land, but only balanced by about 1/4 in terms of ice thickness change and contribution to sea level rise. The overall average elevation change for the grounded ice is + 1.2 cm a(exp -1). Using an average bedrock uplift of 2.5 cm a(exp -1), implies an average ice thickness decrease of 1.3 cm a(exp -1), a mass loss of 22 Gt a(exp -1), and a 0.06 mm a(exp -1) contribution to global sea level rise. |
author |
Cornejo, Helen Koblinsky, Chester J. Brenner, Anita C. Zwally, H. Jay |
author_facet |
Cornejo, Helen Koblinsky, Chester J. Brenner, Anita C. Zwally, H. Jay |
author_sort |
Cornejo, Helen |
title |
Surface Elevation Changes in West Antarctica from Satellite Altimetry: Mass Balance Implications |
title_short |
Surface Elevation Changes in West Antarctica from Satellite Altimetry: Mass Balance Implications |
title_full |
Surface Elevation Changes in West Antarctica from Satellite Altimetry: Mass Balance Implications |
title_fullStr |
Surface Elevation Changes in West Antarctica from Satellite Altimetry: Mass Balance Implications |
title_full_unstemmed |
Surface Elevation Changes in West Antarctica from Satellite Altimetry: Mass Balance Implications |
title_sort |
surface elevation changes in west antarctica from satellite altimetry: mass balance implications |
publishDate |
2001 |
url |
http://hdl.handle.net/2060/20010095012 |
op_coverage |
Unclassified, Unlimited, Publicly available |
long_lat |
ENVELOPE(162.083,162.083,-77.800,-77.800) ENVELOPE(-112.367,-112.367,-74.400,-74.400) ENVELOPE(-62.500,-62.500,-67.500,-67.500) ENVELOPE(-130.000,-130.000,-78.000,-78.000) |
geographic |
Antarctic Antarctic Peninsula Byrd Coates Dotson Ice Shelf Larsen Ice Shelf Marie Byrd Land The Antarctic West Antarctica |
geographic_facet |
Antarctic Antarctic Peninsula Byrd Coates Dotson Ice Shelf Larsen Ice Shelf Marie Byrd Land The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Coates Land Dotson Ice Shelf Ice Shelf Ice Shelves Larsen Ice Shelf Marie Byrd Land Pine Island West Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Coates Land Dotson Ice Shelf Ice Shelf Ice Shelves Larsen Ice Shelf Marie Byrd Land Pine Island West Antarctica |
op_source |
CASI |
op_relation |
Document ID: 20010095012 http://hdl.handle.net/2060/20010095012 |
op_rights |
No Copyright |
_version_ |
1766274617552404480 |