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...
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ftdoajarticles:oai:doaj.org/article:e7809ee4d4714daab3b510213b045d13 2023-05-15T14:02:57+02:00 COMPARISON OF MICROWAVE BACKSCATTER ANISOTROPY PARAMETERISATIONS OVER THE ANTARCTIC ICE SHEET A. D. Fraser N. W. Young N. Adams 2012-07-01T00:00:00Z https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 https://doaj.org/article/e7809ee4d4714daab3b510213b045d13 EN eng Copernicus Publications http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B8/573/2012/isprsarchives-XXXIX-B8-573-2012.pdf https://doaj.org/toc/1682-1750 https://doaj.org/toc/2194-9034 1682-1750 2194-9034 doi:10.5194/isprsarchives-XXXIX-B8-573-2012 https://doaj.org/article/e7809ee4d4714daab3b510213b045d13 The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXIX-B8, Pp 573-577 (2012) Technology T Engineering (General). Civil engineering (General) TA1-2040 Applied optics. Photonics TA1501-1820 article 2012 ftdoajarticles https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 2022-12-31T10:16:02Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic Greenland The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XXXIX-B8 573 577 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Technology T Engineering (General). Civil engineering (General) TA1-2040 Applied optics. Photonics TA1501-1820 |
spellingShingle |
Technology T Engineering (General). Civil engineering (General) TA1-2040 Applied optics. Photonics TA1501-1820 A. D. Fraser N. W. Young N. Adams COMPARISON OF MICROWAVE BACKSCATTER ANISOTROPY PARAMETERISATIONS OVER THE ANTARCTIC ICE SHEET |
topic_facet |
Technology T Engineering (General). Civil engineering (General) TA1-2040 Applied optics. Photonics TA1501-1820 |
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 |
A. D. Fraser N. W. Young N. Adams |
author_facet |
A. D. Fraser N. W. Young N. Adams |
author_sort |
A. D. Fraser |
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 |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/isprsarchives-XXXIX-B8-573-2012 https://doaj.org/article/e7809ee4d4714daab3b510213b045d13 |
geographic |
Antarctic The Antarctic Greenland |
geographic_facet |
Antarctic The Antarctic Greenland |
genre |
Antarc* Antarctic Antarctica Greenland Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Greenland Ice Sheet |
op_source |
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXIX-B8, Pp 573-577 (2012) |
op_relation |
http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXIX-B8/573/2012/isprsarchives-XXXIX-B8-573-2012.pdf https://doaj.org/toc/1682-1750 https://doaj.org/toc/2194-9034 1682-1750 2194-9034 doi:10.5194/isprsarchives-XXXIX-B8-573-2012 https://doaj.org/article/e7809ee4d4714daab3b510213b045d13 |
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 |
_version_ |
1766273401399279616 |