Air temperature ; Freeze-thaw cycle ; Mexico ; Mexico City ; Periglacial features ; Permafrost ; Soil temperature ; Spatial distribution ; Tropical zone ; Volcano
distribution. Daily freeze-thaw cycles at the ground surface are numerous at the summit (around 212 days annually), but cycles cease only a few centimetres below the surface, so that frost action does not occur below 60 cm depth. Permafrost is present at 4900 m
Arctic Region ; C 14 dating ; Canada ; Cold area ; Geochemistry ; Ground ice ; Ice wedge ; Isotope analysis ; Oxygen 18 ; Permafrost ; Pingo ; Polar region
permafrost, as well as ice related to other cold-region phenomena such as ice wedges, icings (aufeis), frost blisters and pingos. The formational age of ground ice bodies ranges from recent (seasonal ice in the active layer) to tens of thousands of years
Aborigines ; Arctic Region ; Climatic change ; Ecosystem ; Eurasia ; Global change ; North America ; Northern hemisphere ; Permafrost ; Road ; Sea ice ; Sea level ; Winter ; World
of permafrost and winter roads, hydrocarbon and agricultural development, sea ice and shipping, ecosystem shifts, and issues of territorial sovereignty. In addition to exploring the current and potential impacts of each agent across the region as a whole
Assessment Report (IPCC AR4). Developments are highlighted in the following major climate system components: ice sheets; sea ice; the Atlantic Meridional Overturning Circulation; tropical forests; and accelerated carbon release from permafrost and ocean
Air temperature ; China ; Climatic change ; Mountain ; Permafrost ; Plateau ; Precipitation ; Qinghai ; Remote sensing ; SPOT ; Soil temperature ; Space time ; Temperature ; Tibet ; Vegetation dynamics ; Vegetation index ; Watershed