Intercomparison Between in situ and AVHRR Polar Pathfinder-Derived Surface Albedo over Greenland
The Advanced Very High Resolution (AVHRR) Polar Pathfinder Data (APP) provides the first long time series of consistent, calibrated surface albedo and surface temperature data for the polar regions. Validations of these products have consisted of individual studies that analyzed algorithm performanc...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20010033250 2023-05-15T16:26:52+02:00 Intercomparison Between in situ and AVHRR Polar Pathfinder-Derived Surface Albedo over Greenland Fowler, Charles Key, Jeffery Haran, Terence Box, Jason E. Stroeve, Julienne C. Unclassified, Unlimited, Publicly available [2001] application/pdf http://hdl.handle.net/2060/20010033250 unknown Document ID: 20010033250 http://hdl.handle.net/2060/20010033250 No Copyright CASI Environment Pollution 2001 ftnasantrs 2019-08-31T23:05:27Z The Advanced Very High Resolution (AVHRR) Polar Pathfinder Data (APP) provides the first long time series of consistent, calibrated surface albedo and surface temperature data for the polar regions. Validations of these products have consisted of individual studies that analyzed algorithm performance for limited regions and or time periods. This paper reports on comparisons made between the APP-derived surface albedo and that measured at fourteen automatic weather stations (AWS) around the Greenland ice sheet from January 1997 to August 1998. Results show that satellite-derived surface albedo values are on average 10% less than those measured by the AWS stations. However, the station measurements tend to be biased high by about 4% and thus the differences in absolute albedo may be less (e.g. 6%). In regions of the ice sheet where the albedo variability is small, such as the dry snow facies, the APP albedo uncertainty exceeds the natural variability. Further work is needed to improve the absolute accuracy of the APP-derived surface albedo. Even so, the data provide temporally and spatially consistent estimates of the Greenland ice sheet albedo. Other/Unknown Material Greenland Ice Sheet NASA Technical Reports Server (NTRS) Greenland |
institution |
Open Polar |
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NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
Environment Pollution |
spellingShingle |
Environment Pollution Fowler, Charles Key, Jeffery Haran, Terence Box, Jason E. Stroeve, Julienne C. Intercomparison Between in situ and AVHRR Polar Pathfinder-Derived Surface Albedo over Greenland |
topic_facet |
Environment Pollution |
description |
The Advanced Very High Resolution (AVHRR) Polar Pathfinder Data (APP) provides the first long time series of consistent, calibrated surface albedo and surface temperature data for the polar regions. Validations of these products have consisted of individual studies that analyzed algorithm performance for limited regions and or time periods. This paper reports on comparisons made between the APP-derived surface albedo and that measured at fourteen automatic weather stations (AWS) around the Greenland ice sheet from January 1997 to August 1998. Results show that satellite-derived surface albedo values are on average 10% less than those measured by the AWS stations. However, the station measurements tend to be biased high by about 4% and thus the differences in absolute albedo may be less (e.g. 6%). In regions of the ice sheet where the albedo variability is small, such as the dry snow facies, the APP albedo uncertainty exceeds the natural variability. Further work is needed to improve the absolute accuracy of the APP-derived surface albedo. Even so, the data provide temporally and spatially consistent estimates of the Greenland ice sheet albedo. |
author |
Fowler, Charles Key, Jeffery Haran, Terence Box, Jason E. Stroeve, Julienne C. |
author_facet |
Fowler, Charles Key, Jeffery Haran, Terence Box, Jason E. Stroeve, Julienne C. |
author_sort |
Fowler, Charles |
title |
Intercomparison Between in situ and AVHRR Polar Pathfinder-Derived Surface Albedo over Greenland |
title_short |
Intercomparison Between in situ and AVHRR Polar Pathfinder-Derived Surface Albedo over Greenland |
title_full |
Intercomparison Between in situ and AVHRR Polar Pathfinder-Derived Surface Albedo over Greenland |
title_fullStr |
Intercomparison Between in situ and AVHRR Polar Pathfinder-Derived Surface Albedo over Greenland |
title_full_unstemmed |
Intercomparison Between in situ and AVHRR Polar Pathfinder-Derived Surface Albedo over Greenland |
title_sort |
intercomparison between in situ and avhrr polar pathfinder-derived surface albedo over greenland |
publishDate |
2001 |
url |
http://hdl.handle.net/2060/20010033250 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
CASI |
op_relation |
Document ID: 20010033250 http://hdl.handle.net/2060/20010033250 |
op_rights |
No Copyright |
_version_ |
1766015861510897664 |