Comparison of Microwave Backscatter Anisotropy Parameterizations of the Antarctic Ice Sheet
The Antarctic Ice Sheet exhibits a strong anisotropy in microwave backscatter, both as a function of azimuth angle and incidenceangle. This anisotropy arises as a result of i) the alignment of roughness elements and other wind-related surface and sub-surfacefeatures, as well as ii) internal layers a...
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ftunivtasecite:oai:ecite.utas.edu.au:86068 2023-05-15T13:37:23+02:00 Comparison of Microwave Backscatter Anisotropy Parameterizations of the Antarctic Ice Sheet Fraser, Alexander Donald Young, NW Adams, ND 2012 application/pdf https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 http://ecite.utas.edu.au/86068 en eng International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences http://ecite.utas.edu.au/86068/1/isprsarchives-XXXIX-B8-573-2012.pdf http://dx.doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 Fraser, Alexander Donald and Young, NW and Adams, ND, Comparison of Microwave Backscatter Anisotropy Parameterizations of the Antarctic Ice Sheet, International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012, 25 August - 01 September 2012, Melbourne, Australia, pp. 573-577. ISSN 2194-9034 (2012) [Non Refereed Conference Paper] http://ecite.utas.edu.au/86068 Earth Sciences Geophysics Geophysics not elsewhere classified Non Refereed Conference Paper NonPeerReviewed 2012 ftunivtasecite https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 2019-12-13T21:50:14Z The Antarctic Ice Sheet exhibits a strong anisotropy in microwave backscatter, both as a function of azimuth angle and incidenceangle. This anisotropy arises as a result of i) the alignment of roughness elements and other wind-related surface and sub-surfacefeatures, as well as ii) internal layers and snow grain size gradient within the snowpack. As a result of its antenna configuration, theEuropean Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) Advanced SCATterometer (ASCAT) satelliteinstrument is able to observe much of the continent with a large azimuth and incidence angle diversity. A lack of azimuth and incidencediversity has restricted previous backscatter parameterisations to relatively simple bi-sinusoidal (azimuth angle) and linear (incidenceangle) parameterisations. Using ASCAT, we show that a better fit can be obtained using a cubic incidence angle function and a Fourierseries of up to four terms for parameterisation of the azimuth angle anisotropy. Scatterometer instruments have previously been usedin Greenland to retrieve accumulation rate by observing the change in backscatter as a function of incidence angle. Here we presentpreliminary results of an empirical study linking the isotropic component and incidence angle dependence to snow accumulation ratein Antarctica, using snow stake measurements as ground truthing. Conference Object Antarc* Antarctic Antarctica Greenland Ice Sheet eCite UTAS (University of Tasmania) Antarctic Greenland The Antarctic The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XXXIX-B8 573 577 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geophysics Geophysics not elsewhere classified |
spellingShingle |
Earth Sciences Geophysics Geophysics not elsewhere classified Fraser, Alexander Donald Young, NW Adams, ND Comparison of Microwave Backscatter Anisotropy Parameterizations of the Antarctic Ice Sheet |
topic_facet |
Earth Sciences Geophysics Geophysics not elsewhere classified |
description |
The Antarctic Ice Sheet exhibits a strong anisotropy in microwave backscatter, both as a function of azimuth angle and incidenceangle. This anisotropy arises as a result of i) the alignment of roughness elements and other wind-related surface and sub-surfacefeatures, as well as ii) internal layers and snow grain size gradient within the snowpack. As a result of its antenna configuration, theEuropean Organisation for the Exploitation of Meteorological Satellites (EUMETSAT) Advanced SCATterometer (ASCAT) satelliteinstrument is able to observe much of the continent with a large azimuth and incidence angle diversity. A lack of azimuth and incidencediversity has restricted previous backscatter parameterisations to relatively simple bi-sinusoidal (azimuth angle) and linear (incidenceangle) parameterisations. Using ASCAT, we show that a better fit can be obtained using a cubic incidence angle function and a Fourierseries of up to four terms for parameterisation of the azimuth angle anisotropy. Scatterometer instruments have previously been usedin Greenland to retrieve accumulation rate by observing the change in backscatter as a function of incidence angle. Here we presentpreliminary results of an empirical study linking the isotropic component and incidence angle dependence to snow accumulation ratein Antarctica, using snow stake measurements as ground truthing. |
format |
Conference Object |
author |
Fraser, Alexander Donald Young, NW Adams, ND |
author_facet |
Fraser, Alexander Donald Young, NW Adams, ND |
author_sort |
Fraser, Alexander Donald |
title |
Comparison of Microwave Backscatter Anisotropy Parameterizations of the Antarctic Ice Sheet |
title_short |
Comparison of Microwave Backscatter Anisotropy Parameterizations of the Antarctic Ice Sheet |
title_full |
Comparison of Microwave Backscatter Anisotropy Parameterizations of the Antarctic Ice Sheet |
title_fullStr |
Comparison of Microwave Backscatter Anisotropy Parameterizations of the Antarctic Ice Sheet |
title_full_unstemmed |
Comparison of Microwave Backscatter Anisotropy Parameterizations of the Antarctic Ice Sheet |
title_sort |
comparison of microwave backscatter anisotropy parameterizations of the antarctic ice sheet |
publisher |
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences |
publishDate |
2012 |
url |
https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 http://ecite.utas.edu.au/86068 |
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 |
http://ecite.utas.edu.au/86068/1/isprsarchives-XXXIX-B8-573-2012.pdf http://dx.doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 Fraser, Alexander Donald and Young, NW and Adams, ND, Comparison of Microwave Backscatter Anisotropy Parameterizations of the Antarctic Ice Sheet, International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B8, 2012, 25 August - 01 September 2012, Melbourne, Australia, pp. 573-577. ISSN 2194-9034 (2012) [Non Refereed Conference Paper] http://ecite.utas.edu.au/86068 |
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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1766090968332763136 |