منابع مشابه
Vanishing Polar Ice Sheets
Global temperatures have increased by 0.8◦C since instrumental records began, and the last decade has been the warmest. This warming has been closely linked to increasing greenhouse gas concentrations due to human activities. Arctic warming is leading to thinning and disappearance of sea ice on the Arctic Ocean and the increased melting of the Greenland ice sheet. In the last decade the Antarct...
متن کاملDynamic Recrystallization of Ice in Polar Ice Sheets
The deformation and recrystallization mechanisms which control the viscoplasticity of ice from polar ice sheets have been investigated. The high plastic anisotropy of ice crystals is responsible for the development of a non uniform internal stress field within the polycrystal. Strain-shadows produced by sub-grain are observed in polarized light when the rotation recrystallization regime is domi...
متن کاملMass balance of polar ice sheets.
Recent advances in the determination of the mass balance of polar ice sheets show that the Greenland Ice Sheet is losing mass by near-coastal thinning, and that the West Antarctic Ice Sheet, with thickening in the west and thinning in the north, is probably thinning overall. The mass imbalance of the East Antarctic Ice Sheet is likely to be small, but even its sign cannot yet be determined. Lar...
متن کاملRecent Precipitation Trends over the Polar Ice Sheets
Meteorological and glaciological analyses are integrated to examine the precipitation trends during the last three decades over the ice sheets covering Antarctica and Greenland. For Antarctica, the best data source is provided by glaciologicallymeasured trends of snow accumulation, and for limited sectors of East Antarctica consistency with precipitation amounts calculated from the atmospheric ...
متن کاملPolar mesosphere winter echoes
The thermal and dynamical state of the atmosphere during polar mesosphere winter echoes F.-J. Lübken, B. Strelnikov, M. Rapp, W. Singer, R. Latteck, A. Brattli, U.-P. Hoppe, and M. Friedrich Leibniz Institute of Atmospheric Physics, Kühlungsborn, Germany Norwegian Defence Research Establishment (FFI), Kjeller, Norway Institute of Communications Networks and Satellite Communications, Graz Univer...
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ژورنال
عنوان ژورنال: Journal of Glaciology
سال: 1975
ISSN: 0022-1430,1727-5652
DOI: 10.1017/s0022143000034304