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Abstract
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| Island glaciers off the coast of Antarctic Peninsula are sensitive to climate change due to their small size and maritime climate. The temperature record at the Faraday/Vernadsky station shows an annual temperature trend of about +2.5 C over the past 50 years. Currently there is limited information on the mass balance of glaciers surrounding Antarctica, and therefore there is a need for velocity data for these glaciers to calculate mass flux estimates as well as calibration and validation of models. In this study we observe the glacier surface velocities of major islands in the South Shetland Islands group using data from ALOS PALSAR imagery. These images provide a useful data set throughout the year, because SAR signals penetrate through clouds and acquire images independent of solar illumination. Image pairs are processed using the SAR feature tracking technique to obtain surface velocities between the first and second image acquisitions. Using leastsquares inversion, multiple surface velocity measurements are converted into a time series, which is then analyzed for presence of seasonal variations in surface velocity. Based on average SAR surface velocities, ice thickness is estimated for selected glacier catchments based on Glen and Weertman (deformation and sliding) flow laws. The estimated ice thickness is compared with external measurements to estimate the accuracy of the method. Ice flux is then calculated at the flux gates for | |
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International
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Si |
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Congress
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American Geophysical Union Fall 2012 Meeting |
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960 |
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Place
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San Francisco, California |
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Reviewers
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Si |
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ISBN/ISSN
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Start Date
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03/12/2012 |
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End Date
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07/12/2012 |
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From page
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1 |
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To page
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1 |
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Proc. of American Geophysical Union Fall 2012 Meeting |