Determination of glacier velocities on King George Island (Antarctic Peninsula) by DIFSAR

Albert Moll(1) and Matthias Braun(1)

(1) Center of Remote Sensing of Land Surfaces, Walter-Flex-Str. 3, 53113 Bonn, Germany

Abstract

In the area of the Antarctic Peninsula, different changes of climatic parameters have been detected at different sites in the second half of the 20th century, e.g. an increase of air temperature and a change in the amount of precipitation. At the same time a retreat of glacier front positions has been observed. Various data point to a change in glacier mass balance, but at the moment there is little data available to validate these assumptions. Spatial information about glacier velocity and precise surface topography exists for selected areas, only. A considerable amount of ERS-Tandem data is archived for the Antarctic Peninsula. However, interferometric analyses have only been performed for a small amount of these data. The poster presents first results for a complete glacier velocity field of King George Island. Several problems that are typical for this area are addressed, including wet snow conditions, relative high temperatures and high temporal dynamics of snowcover, all of which result in very low and spatially irregular coherence. DIFSAR results are compared to point measurements (DGPS) from field surveys in the austral summer 2004/2005.

 

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