Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar
In recent years there has been increased interest in using synthetic aperture radar (SAR) to study glaciers for climate change research. Extensions to SAR such as polarimetric interferometric SAR (Pol-InSAR) offer additional potential in quantifying glaciological parameters such as the extinction co...
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ftdlr:oai:elib.dlr.de:69111 2023-05-15T15:33:56+02:00 Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar Sharma, Jayanti 2010-08-12 http://elib.dlr.de/69111/ unknown Sharma, Jayanti (2010) Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar. Dissertation, Karlsruher Institut für Technologie. Radarkonzepte Hochschulschrift PeerReviewed 2010 ftdlr 2016-03-28T20:52:56Z In recent years there has been increased interest in using synthetic aperture radar (SAR) to study glaciers for climate change research. Extensions to SAR such as polarimetric interferometric SAR (Pol-InSAR) offer additional potential in quantifying glaciological parameters such as the extinction coefficient. Extinctions are useful in characerising regions in increased volume scatter, which are related to the presence of ice structure. In this thesis a new scattering model relating long-wavelength Pol-InSAR observables to the ice extinction coefficient is proposed. Pol-InSAR coherences are modelled as a combination of a surface contribution (from the snow-firn interface and wind-induced sastrugi features) and a volume response. Surface-to-volume scattering ratios derived from a novel polarimetric decomposition are used with Pol-InSAR coherences to invert the extinction of the ice volume. The inversion is performed on airborne Pol-InSAR data at L-band and P-band frequencies acquired by DLR's E-SAR system over the Austfonna ice cap in Svalbard. Extinction dependencies on frequency and glacier zone are investigated, and validation is pefromed comparing ground penetrating radar data and airborne sounder data to extinction values. Thesis Austfonna glacier Ice cap Svalbard German Aerospace Center: elib - DLR electronic library Svalbard Austfonna ENVELOPE(24.559,24.559,79.835,79.835) Sastrugi ENVELOPE(163.683,163.683,-74.617,-74.617) |
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German Aerospace Center: elib - DLR electronic library |
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Radarkonzepte Sharma, Jayanti Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar |
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Radarkonzepte |
description |
In recent years there has been increased interest in using synthetic aperture radar (SAR) to study glaciers for climate change research. Extensions to SAR such as polarimetric interferometric SAR (Pol-InSAR) offer additional potential in quantifying glaciological parameters such as the extinction coefficient. Extinctions are useful in characerising regions in increased volume scatter, which are related to the presence of ice structure. In this thesis a new scattering model relating long-wavelength Pol-InSAR observables to the ice extinction coefficient is proposed. Pol-InSAR coherences are modelled as a combination of a surface contribution (from the snow-firn interface and wind-induced sastrugi features) and a volume response. Surface-to-volume scattering ratios derived from a novel polarimetric decomposition are used with Pol-InSAR coherences to invert the extinction of the ice volume. The inversion is performed on airborne Pol-InSAR data at L-band and P-band frequencies acquired by DLR's E-SAR system over the Austfonna ice cap in Svalbard. Extinction dependencies on frequency and glacier zone are investigated, and validation is pefromed comparing ground penetrating radar data and airborne sounder data to extinction values. |
format |
Thesis |
author |
Sharma, Jayanti |
author_facet |
Sharma, Jayanti |
author_sort |
Sharma, Jayanti |
title |
Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar |
title_short |
Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar |
title_full |
Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar |
title_fullStr |
Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar |
title_full_unstemmed |
Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar |
title_sort |
estimation of glacier ice extinction coefficients using long-wavelength polarimetric interferometric synthetic aperture radar |
publishDate |
2010 |
url |
http://elib.dlr.de/69111/ |
long_lat |
ENVELOPE(24.559,24.559,79.835,79.835) ENVELOPE(163.683,163.683,-74.617,-74.617) |
geographic |
Svalbard Austfonna Sastrugi |
geographic_facet |
Svalbard Austfonna Sastrugi |
genre |
Austfonna glacier Ice cap Svalbard |
genre_facet |
Austfonna glacier Ice cap Svalbard |
op_relation |
Sharma, Jayanti (2010) Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar. Dissertation, Karlsruher Institut für Technologie. |
_version_ |
1766364515560062976 |