Map shawin extent an teeps o permafrost in the Northren Hemisphere
|Uised in||Internaitional Permafrost Association|
|Climate||Heich latitudes, alpine regions|
In geology, permafrost is grund, includin rock or (cryotic) sile, at or ablo the freezin pynt o watter 0 °C (32 °F) for twa or mair years. Maist permafrost is locatit in heich latitudes (in an aroond the Arctic an Antarctic regions), but alpine permafrost mey exeest at heich altitudes in much lawer latitudes. Grund ice isna ayeweys present, as mey be in the case o nonporous bedrock, but it frequently occurs an it mey be in amoonts exceedin the potential hydraulic saturation o the grund material. Permafrost accoonts for 0.022% o tot watter on yird an exeests in 24% of exposed laund in the Northren Hemisphere. It an aa occurs subsea on the continental shelves o the continents surroondin the Arctic Ocean, portions o which war exposed during the last glacial period, wi global wather implications.
References[eedit | eedit soorce]
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