Mapping daily snow/ice shortwave broadband albedo from Moderate Resolution Imaging Spectroradiometer (MODIS): The improved direct retrieval algorithm and validation with Greenland in situ measurement
Snow/ice albedo is a critical variable in surface energy balance calculations. The Moderate Resolution Imaging Spectroradiometer (MODIS) data have been used routinely to provide global land surface albedo. The MODIS algorithm includes atmospheric correction, surface reflectance angular modeling, and...
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American Geophysical Union
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Online Access: | http://hdl.handle.net/1903/4315 |
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ftunivmaryland:oai:drum.lib.umd.edu:1903/4315 2023-05-15T16:27:57+02:00 Mapping daily snow/ice shortwave broadband albedo from Moderate Resolution Imaging Spectroradiometer (MODIS): The improved direct retrieval algorithm and validation with Greenland in situ measurement Liang, Shunlin Stroeve, Julienne Box, Jason E. 2005-05-26 319270 bytes application/pdf http://hdl.handle.net/1903/4315 en_US eng American Geophysical Union College of Behavioral & Social Sciences Geography Digital Repository at the University of Maryland University of Maryland (College Park, Md.) Liang, S., J. Stroeve, and J. E. Box (2005), Mapping daily snow/ice shortwave broadband albedo from Moderate Resolution Imaging Spectroradiometer (MODIS): The improved direct retrieval algorithm and validation with Greenland in situ measurement, J. Geophys. Res., 110, D10109, doi:10.1029/2004JD005493. http://hdl.handle.net/1903/4315 ice albedo snow albedo surface energy balance calculations Moderate Resolution Imaging Spectroradiometer MODIS global land surface albedo extensive radiative transfer direct retrieval algorithm Article 2005 ftunivmaryland https://doi.org/10.1029/2004JD005493 2022-11-11T11:12:19Z Snow/ice albedo is a critical variable in surface energy balance calculations. The Moderate Resolution Imaging Spectroradiometer (MODIS) data have been used routinely to provide global land surface albedo. The MODIS algorithm includes atmospheric correction, surface reflectance angular modeling, and narrowband to broadband albedo conversion. In an earlier study, a "direct retrieval" methodology was proposed to calculate instantaneous albedo over snow and ice-covered surfaces directly from top-of-atmosphere (TOA) MODIS reflectance data. The method consists of extensive radiative transfer simulations for a variety of atmospheric and surface snow conditions and links the TOA reflectance with surface broadband albedo through regression analysis. Therefore the direct retrieval algorithm implicitly incorporates in a single step all three procedures used in the standard MODIS surface albedo algorithm. This study presents improvements to the retrieval algorithm including validation with in situ measurements distributed over the Greenland ice sheet. Comparison with surface observations demonstrates that the direct retrieval algorithm can produce very accurate daily snow/ice albedo with mean bias of less than 0.02 and residual standard error of 0.04. Article in Journal/Newspaper Greenland Ice Sheet University of Maryland: Digital Repository (DRUM) Greenland Journal of Geophysical Research 110 D10 |
institution |
Open Polar |
collection |
University of Maryland: Digital Repository (DRUM) |
op_collection_id |
ftunivmaryland |
language |
English |
topic |
ice albedo snow albedo surface energy balance calculations Moderate Resolution Imaging Spectroradiometer MODIS global land surface albedo extensive radiative transfer direct retrieval algorithm |
spellingShingle |
ice albedo snow albedo surface energy balance calculations Moderate Resolution Imaging Spectroradiometer MODIS global land surface albedo extensive radiative transfer direct retrieval algorithm Liang, Shunlin Stroeve, Julienne Box, Jason E. Mapping daily snow/ice shortwave broadband albedo from Moderate Resolution Imaging Spectroradiometer (MODIS): The improved direct retrieval algorithm and validation with Greenland in situ measurement |
topic_facet |
ice albedo snow albedo surface energy balance calculations Moderate Resolution Imaging Spectroradiometer MODIS global land surface albedo extensive radiative transfer direct retrieval algorithm |
description |
Snow/ice albedo is a critical variable in surface energy balance calculations. The Moderate Resolution Imaging Spectroradiometer (MODIS) data have been used routinely to provide global land surface albedo. The MODIS algorithm includes atmospheric correction, surface reflectance angular modeling, and narrowband to broadband albedo conversion. In an earlier study, a "direct retrieval" methodology was proposed to calculate instantaneous albedo over snow and ice-covered surfaces directly from top-of-atmosphere (TOA) MODIS reflectance data. The method consists of extensive radiative transfer simulations for a variety of atmospheric and surface snow conditions and links the TOA reflectance with surface broadband albedo through regression analysis. Therefore the direct retrieval algorithm implicitly incorporates in a single step all three procedures used in the standard MODIS surface albedo algorithm. This study presents improvements to the retrieval algorithm including validation with in situ measurements distributed over the Greenland ice sheet. Comparison with surface observations demonstrates that the direct retrieval algorithm can produce very accurate daily snow/ice albedo with mean bias of less than 0.02 and residual standard error of 0.04. |
format |
Article in Journal/Newspaper |
author |
Liang, Shunlin Stroeve, Julienne Box, Jason E. |
author_facet |
Liang, Shunlin Stroeve, Julienne Box, Jason E. |
author_sort |
Liang, Shunlin |
title |
Mapping daily snow/ice shortwave broadband albedo from Moderate Resolution Imaging Spectroradiometer (MODIS): The improved direct retrieval algorithm and validation with Greenland in situ measurement |
title_short |
Mapping daily snow/ice shortwave broadband albedo from Moderate Resolution Imaging Spectroradiometer (MODIS): The improved direct retrieval algorithm and validation with Greenland in situ measurement |
title_full |
Mapping daily snow/ice shortwave broadband albedo from Moderate Resolution Imaging Spectroradiometer (MODIS): The improved direct retrieval algorithm and validation with Greenland in situ measurement |
title_fullStr |
Mapping daily snow/ice shortwave broadband albedo from Moderate Resolution Imaging Spectroradiometer (MODIS): The improved direct retrieval algorithm and validation with Greenland in situ measurement |
title_full_unstemmed |
Mapping daily snow/ice shortwave broadband albedo from Moderate Resolution Imaging Spectroradiometer (MODIS): The improved direct retrieval algorithm and validation with Greenland in situ measurement |
title_sort |
mapping daily snow/ice shortwave broadband albedo from moderate resolution imaging spectroradiometer (modis): the improved direct retrieval algorithm and validation with greenland in situ measurement |
publisher |
American Geophysical Union |
publishDate |
2005 |
url |
http://hdl.handle.net/1903/4315 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
College of Behavioral & Social Sciences Geography Digital Repository at the University of Maryland University of Maryland (College Park, Md.) Liang, S., J. Stroeve, and J. E. Box (2005), Mapping daily snow/ice shortwave broadband albedo from Moderate Resolution Imaging Spectroradiometer (MODIS): The improved direct retrieval algorithm and validation with Greenland in situ measurement, J. Geophys. Res., 110, D10109, doi:10.1029/2004JD005493. http://hdl.handle.net/1903/4315 |
op_doi |
https://doi.org/10.1029/2004JD005493 |
container_title |
Journal of Geophysical Research |
container_volume |
110 |
container_issue |
D10 |
_version_ |
1766017568591577088 |