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11:54 Nov 20, 2008
English to Chinese translations [PRO] Science - Geology Additional field(s): Environment & Ecology, Meteorology
English term or phrase:permafrost
Definition from weatherdudes.com: A layer of soil at varying depths below the surface in which the temperature has remained below freezing continuously from a few to several thousands of years.
ecent warming has degraded large sections of permafrost, with pockets of soil collapsing as the ice within it melts. The results include buckled highways, destabilized houses, and "drunken forests" of trees that lean at wild angles. National Center for Atmospheric Research
The different climatic conditions determinate the cryogenic asymmetry of the Antarctic Peninsula with respect the continuous permafrost on north-east side and the discontinuous permafrost on the west sector. tierradelfuego.gov.ar
Understanding permafrost is not only important to civil engineering and architecture, it is also a crucial part of studying global change and protecting the environment in cold regions. The National Snow and Ice Data Center
Definition from Wikipedia: 一个地质学的名词，指当冻土层（Tundra）处于水的结冰点以下(即0℃)超过两年的状况。永久冻土地带的泥土不一定有水份，例如在无孔基岩(不透水的岩石)里就不可能有水；但在大多数情况下，水不单存在，而且更超过地表物料的潜在水饱和量。一般的冻土层在气候回暖或受到强压时，冻土内的冰会溶解成为水；但永久冻土的所在之处，即使在天气回暖之时，气温仍然在冻点以下，使冻土内的冰不能再次溶解成为水份，因而使冻土的组成不变。