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Comparison of Microwave Backscatter Anisotropy Parameterizations of the Antarctic Ice Sheet

Citation

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]


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DOI: doi:10.5194/isprsarchives-XXXIX-B8-573-2012

Abstract

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.

Item Details

Item Type:Non Refereed Conference Paper
Keywords:Snow, Ice, Glaciology, Research, Active, Microwave, Satellite
Research Division:Earth Sciences
Research Group:Geophysics
Research Field:Geophysics not elsewhere classified
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate Variability (excl. Social Impacts)
Author:Fraser, Alexander Donald (Dr Alex Fraser)
Author:Young, NW (Mr Neal Young)
Author:Adams, ND (Dr Neil Adams)
ID Code:86068
Year Published:2012
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2013-08-21
Last Modified:2014-06-05
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