• Permafrost
  • Pertaining to the extent, depth, and other characteristics of frozen subsoil located in arctic/subarctic areas 
Abstract from DBPedia
    In geology, permafrost is ground, including rock or (cryotic) soil, at or below the freezing point of water 0 °C (32 °F) for two or more years. Most permafrost is located in high latitudes (in and around the Arctic and Antarctic regions), but alpine permafrost may exist at high altitudes in much lower latitudes. Ground ice is not always present, as may be in the case of nonporous bedrock, but it frequently occurs and it may be in amounts exceeding the potential hydraulic saturation of the ground material. Permafrost accounts for 0.022% of total water on earth and exists in 24% of exposed land in the Northern Hemisphere. It also occurs subsea on the continental shelves of the continents surrounding the Arctic Ocean, portions of which were exposed during the last glacial period. A global temperature rise of 1.5 °C (2.7 °F) above current levels would be enough to start the thawing of permafrost in Siberia, according to one group of scientists.

    永久凍土(えいきゅうとうど)とは少なくとも2冬とその間の1夏を含めた期間より長い間連続して凍結した状態の土壌を指す。英語では、permafrost と表記するが、permanently frozen groundの省略語で1945年に S. W. MULLERによって使われた。


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