Antarctic palaeo-ice streams
نویسندگان
چکیده
منابع مشابه
Effect of Ocean Warming on West Antarctic Ice Streams and Ice Shelves
The Intergovernmental Panel on Climate Change (IPCC) has deemed the Western Antarctic Ice Sheet (WAIS) as very likely to have contributed to sea level rice over the past two decades, estimating a loss of 44 ±13 Gt/yr. Focus has shifted to the behavior and dynamics of the WAIS ice streams since ~90 % of the outward ice flux flows through the ice streams. The behavior and movement of the ice stre...
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We present a reference, comprehensive, high-resolution, digital mosaic of ice motion in Antarctica assembled from multiple satellite interferometric synthetic-aperture radar data acquired during the International Polar Year 2007 to 2009. The data reveal widespread, patterned, enhanced flow with tributary glaciers reaching hundreds to thousands of kilometers inland over the entire continent. Thi...
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Flow of glacial ice in the West Antarctic Sheet localizes in nar-3 row bands of fast flowing ice streams bordered by ridges of nearly stagnant 4 ice, but our understanding of the physical processes that generate this mor-5 phology is incomplete. Here, we study the thermal and mechanical proper-6 ties of ice-stream margins, where flow transitions from rapid to stagnant over 7 a few kilometers. O...
متن کاملShear heating and weakening of the margins of West Antarctic ice streams
Ice streams are fast flowing bands of ice separated from stagnant ridges by shear margins. The mechanisms controlling the location of the margins remain unclear. We use published ice deformation data and a simple one-dimensional thermal model to show that West Antarctic ice stream margins have temperate ice over a substantial fraction of their thickness, a condition that may control their width...
متن کاملSnow on Antarctic Sea Ice
Snow on Antarctic sea ice plays a complex and highly variable role in air-sea-ice interaction processes and the Earth’s climate system. Using data collected mostly during the past 10 years, this paper reviews the following topics: snow thickness and snow type and their geographical and seasonal variations; snow grain size, density, and salinity; frequency of occurrence of slush; thermal conduct...
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ژورنال
عنوان ژورنال: Earth-Science Reviews
سال: 2012
ISSN: 0012-8252
DOI: 10.1016/j.earscirev.2011.10.003