Determining Greenland Ice Sheet Accumulation Rates from Radar Remote Sensing
An important component of NASA's Program for Arctic Regional Climate Assessment (PARCA) is a mass balance investigation of the Greenland Ice Sheet. The mass balance is calculated by taking the difference between the areally Integrated snow accumulation and the net ice discharge of the ice sheet...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20030002360 2023-05-15T15:11:01+02:00 Determining Greenland Ice Sheet Accumulation Rates from Radar Remote Sensing Jezek, Kenneth C. Unclassified, Unlimited, Publicly available Nov. 12, 2002 application/pdf http://hdl.handle.net/2060/20030002360 unknown Document ID: 20030002360 http://hdl.handle.net/2060/20030002360 No Copyright CASI Oceanography 2002 ftnasantrs 2019-07-21T07:47:09Z An important component of NASA's Program for Arctic Regional Climate Assessment (PARCA) is a mass balance investigation of the Greenland Ice Sheet. The mass balance is calculated by taking the difference between the areally Integrated snow accumulation and the net ice discharge of the ice sheet. Uncertainties in this calculation Include the snow accumulation rate, which has traditionally been determined by interpolating data from ice core samples taken from isolated spots across the ice sheet. The sparse data associated with ice cores juxtaposed against the high spatial and temporal resolution provided by remote sensing , has motivated scientists to investigate relationships between accumulation rate and microwave observations as an option for obtaining spatially contiguous estimates. The objective of this PARCA continuation proposal was to complete an estimate of surface accumulation rate on the Greenland Ice Sheet derived from C-band radar backscatter data compiled in the ERS-1 SAR mosaic of data acquired during, September-November, 1992. An empirical equation, based on elevation and latitude, is used to determine the mean annual temperature. We examine the influence of accumulation rate, and mean annual temperature on C-band radar backscatter using a forward model, which incorporates snow metamorphosis and radar backscatter components. Our model is run over a range of accumulation and temperature conditions. Based on the model results, we generate a look-up table, which uniquely maps the measured radar backscatter, and mean annual temperature to accumulation rate. Our results compare favorably with in situ accumulation rate measurements falling within our study area. Other/Unknown Material Arctic Arctic Regional Climate Assessment Greenland ice core Ice Sheet PARCA Program for Arctic Regional Climate Assessment NASA Technical Reports Server (NTRS) Arctic Greenland |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
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Oceanography |
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Oceanography Jezek, Kenneth C. Determining Greenland Ice Sheet Accumulation Rates from Radar Remote Sensing |
topic_facet |
Oceanography |
description |
An important component of NASA's Program for Arctic Regional Climate Assessment (PARCA) is a mass balance investigation of the Greenland Ice Sheet. The mass balance is calculated by taking the difference between the areally Integrated snow accumulation and the net ice discharge of the ice sheet. Uncertainties in this calculation Include the snow accumulation rate, which has traditionally been determined by interpolating data from ice core samples taken from isolated spots across the ice sheet. The sparse data associated with ice cores juxtaposed against the high spatial and temporal resolution provided by remote sensing , has motivated scientists to investigate relationships between accumulation rate and microwave observations as an option for obtaining spatially contiguous estimates. The objective of this PARCA continuation proposal was to complete an estimate of surface accumulation rate on the Greenland Ice Sheet derived from C-band radar backscatter data compiled in the ERS-1 SAR mosaic of data acquired during, September-November, 1992. An empirical equation, based on elevation and latitude, is used to determine the mean annual temperature. We examine the influence of accumulation rate, and mean annual temperature on C-band radar backscatter using a forward model, which incorporates snow metamorphosis and radar backscatter components. Our model is run over a range of accumulation and temperature conditions. Based on the model results, we generate a look-up table, which uniquely maps the measured radar backscatter, and mean annual temperature to accumulation rate. Our results compare favorably with in situ accumulation rate measurements falling within our study area. |
author |
Jezek, Kenneth C. |
author_facet |
Jezek, Kenneth C. |
author_sort |
Jezek, Kenneth C. |
title |
Determining Greenland Ice Sheet Accumulation Rates from Radar Remote Sensing |
title_short |
Determining Greenland Ice Sheet Accumulation Rates from Radar Remote Sensing |
title_full |
Determining Greenland Ice Sheet Accumulation Rates from Radar Remote Sensing |
title_fullStr |
Determining Greenland Ice Sheet Accumulation Rates from Radar Remote Sensing |
title_full_unstemmed |
Determining Greenland Ice Sheet Accumulation Rates from Radar Remote Sensing |
title_sort |
determining greenland ice sheet accumulation rates from radar remote sensing |
publishDate |
2002 |
url |
http://hdl.handle.net/2060/20030002360 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Regional Climate Assessment Greenland ice core Ice Sheet PARCA Program for Arctic Regional Climate Assessment |
genre_facet |
Arctic Arctic Regional Climate Assessment Greenland ice core Ice Sheet PARCA Program for Arctic Regional Climate Assessment |
op_source |
CASI |
op_relation |
Document ID: 20030002360 http://hdl.handle.net/2060/20030002360 |
op_rights |
No Copyright |
_version_ |
1766341934705541120 |