COMPARISON OF MICROWAVE BACKSCATTER ANISOTROPY PARAMETERISATIONS OVER THE ANTARCTIC ICE SHEET
The Antarctic Ice Sheet exhibits a strong anisotropy in microwave backscatter, both as a function of azimuth angle and incidence angle. This anisotropy arises as a result of i) the alignment of roughness elements and other wind-related surface and sub-surface features, as well as ii) internal layers...
Published in: | The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 https://noa.gwlb.de/receive/cop_mods_00024962 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00024917/isprsarchives-XXXIX-B8-573-2012.pdf https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B8/573/2012/isprsarchives-XXXIX-B8-573-2012.pdf |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00024962 2023-05-15T13:36:44+02:00 COMPARISON OF MICROWAVE BACKSCATTER ANISOTROPY PARAMETERISATIONS OVER THE ANTARCTIC ICE SHEET Fraser, A. D. Young, N. W. Adams, N. 2012-07 electronic https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 https://noa.gwlb.de/receive/cop_mods_00024962 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00024917/isprsarchives-XXXIX-B8-573-2012.pdf https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B8/573/2012/isprsarchives-XXXIX-B8-573-2012.pdf eng eng ISPRS ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences -- http://www.isprs.org/publications/archives.aspx -- 2194-9034 https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 https://noa.gwlb.de/receive/cop_mods_00024962 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00024917/isprsarchives-XXXIX-B8-573-2012.pdf https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B8/573/2012/isprsarchives-XXXIX-B8-573-2012.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2012 ftnonlinearchiv https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 2022-02-08T22:49:56Z The Antarctic Ice Sheet exhibits a strong anisotropy in microwave backscatter, both as a function of azimuth angle and incidence angle. This anisotropy arises as a result of i) the alignment of roughness elements and other wind-related surface and sub-surface features, as well as ii) internal layers and snow grain size gradient within the snowpack. As a result of its antenna configuration, the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) Advanced SCATterometer (ASCAT) satellite instrument is able to observe much of the continent with a large azimuth and incidence angle diversity. A lack of azimuth and incidence diversity has restricted previous backscatter parameterisations to relatively simple bi-sinusoidal (azimuth angle) and linear (incidence angle) parameterisations. Using ASCAT, we show that a better fit can be obtained using a cubic incidence angle function and a Fourier series of up to four terms for parameterisation of the azimuth angle anisotropy. Scatterometer instruments have previously been used in Greenland to retrieve accumulation rate by observing the change in backscatter as a function of incidence angle. Here we present preliminary results of an empirical study linking the isotropic component and incidence angle dependence to snow accumulation rate in Antarctica, using snow stake measurements as ground truthing. Article in Journal/Newspaper Antarc* Antarctic Antarctica Greenland Ice Sheet Niedersächsisches Online-Archiv NOA Antarctic Greenland The Antarctic The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XXXIX-B8 573 577 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Fraser, A. D. Young, N. W. Adams, N. COMPARISON OF MICROWAVE BACKSCATTER ANISOTROPY PARAMETERISATIONS OVER THE ANTARCTIC ICE SHEET |
topic_facet |
article Verlagsveröffentlichung |
description |
The Antarctic Ice Sheet exhibits a strong anisotropy in microwave backscatter, both as a function of azimuth angle and incidence angle. This anisotropy arises as a result of i) the alignment of roughness elements and other wind-related surface and sub-surface features, as well as ii) internal layers and snow grain size gradient within the snowpack. As a result of its antenna configuration, the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) Advanced SCATterometer (ASCAT) satellite instrument is able to observe much of the continent with a large azimuth and incidence angle diversity. A lack of azimuth and incidence diversity has restricted previous backscatter parameterisations to relatively simple bi-sinusoidal (azimuth angle) and linear (incidence angle) parameterisations. Using ASCAT, we show that a better fit can be obtained using a cubic incidence angle function and a Fourier series of up to four terms for parameterisation of the azimuth angle anisotropy. Scatterometer instruments have previously been used in Greenland to retrieve accumulation rate by observing the change in backscatter as a function of incidence angle. Here we present preliminary results of an empirical study linking the isotropic component and incidence angle dependence to snow accumulation rate in Antarctica, using snow stake measurements as ground truthing. |
format |
Article in Journal/Newspaper |
author |
Fraser, A. D. Young, N. W. Adams, N. |
author_facet |
Fraser, A. D. Young, N. W. Adams, N. |
author_sort |
Fraser, A. D. |
title |
COMPARISON OF MICROWAVE BACKSCATTER ANISOTROPY PARAMETERISATIONS OVER THE ANTARCTIC ICE SHEET |
title_short |
COMPARISON OF MICROWAVE BACKSCATTER ANISOTROPY PARAMETERISATIONS OVER THE ANTARCTIC ICE SHEET |
title_full |
COMPARISON OF MICROWAVE BACKSCATTER ANISOTROPY PARAMETERISATIONS OVER THE ANTARCTIC ICE SHEET |
title_fullStr |
COMPARISON OF MICROWAVE BACKSCATTER ANISOTROPY PARAMETERISATIONS OVER THE ANTARCTIC ICE SHEET |
title_full_unstemmed |
COMPARISON OF MICROWAVE BACKSCATTER ANISOTROPY PARAMETERISATIONS OVER THE ANTARCTIC ICE SHEET |
title_sort |
comparison of microwave backscatter anisotropy parameterisations over the antarctic ice sheet |
publisher |
ISPRS |
publishDate |
2012 |
url |
https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 https://noa.gwlb.de/receive/cop_mods_00024962 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00024917/isprsarchives-XXXIX-B8-573-2012.pdf https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B8/573/2012/isprsarchives-XXXIX-B8-573-2012.pdf |
geographic |
Antarctic Greenland The Antarctic |
geographic_facet |
Antarctic Greenland The Antarctic |
genre |
Antarc* Antarctic Antarctica Greenland Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Greenland Ice Sheet |
op_relation |
ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences -- http://www.isprs.org/publications/archives.aspx -- 2194-9034 https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 https://noa.gwlb.de/receive/cop_mods_00024962 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00024917/isprsarchives-XXXIX-B8-573-2012.pdf https://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B8/573/2012/isprsarchives-XXXIX-B8-573-2012.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 |
container_title |
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
container_volume |
XXXIX-B8 |
container_start_page |
573 |
op_container_end_page |
577 |
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1766083295263588352 |