Permafrost: Difference between revisions
From Glossary of Meteorology
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#<div class="definition"><div class="short_definition">( | #<div class="definition"><div class="short_definition">(''Also called'' perennially frozen ground, pergelisol, permanently frozen ground.) A layer of soil or bedrock at a variable depth beneath the surface of the earth in which the [[temperature]] has been below [[freezing]] continuously from a few to several thousands of years.</div><br/> <div class="paragraph">Permafrost exists where the summer heating fails to descend to the base of the layer of [[frozen ground|frozen ground]]. A continuous stratum of permafrost is found where the annual [[mean temperature]] is below about -5°C (23°F).<br/>''Compare'' [[pereletok]]; <br/>''see'' [[active layer|active layer]].</div><br/> </div> | ||
#<div class="definition"><div class="short_definition">As limited in application by P. F. Svetsov, soil that is known to have been frozen for at least a century.</div><br/> </div><div class="reference">Muller, S. W. 1947. Permafrost, or Permanently Frozen Ground, and Related Engineering Problems. </div><br/> <div class="reference">Hare, F. K. 1951. Compendium of Meteorology. p. 958, and map, p. 956. </div><br/> | #<div class="definition"><div class="short_definition">As limited in application by P. F. Svetsov, soil that is known to have been frozen for at least a century.</div><br/> </div><div class="reference">Muller, S. W. 1947. Permafrost, or Permanently Frozen Ground, and Related Engineering Problems. </div><br/> <div class="reference">Hare, F. K. 1951. Compendium of Meteorology. p. 958, and map, p. 956. </div><br/> | ||
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Latest revision as of 17:35, 25 April 2012
permafrost
- (Also called perennially frozen ground, pergelisol, permanently frozen ground.) A layer of soil or bedrock at a variable depth beneath the surface of the earth in which the temperature has been below freezing continuously from a few to several thousands of years.
Permafrost exists where the summer heating fails to descend to the base of the layer of frozen ground. A continuous stratum of permafrost is found where the annual mean temperature is below about -5°C (23°F).
Compare pereletok;
see active layer.
- As limited in application by P. F. Svetsov, soil that is known to have been frozen for at least a century.
Muller, S. W. 1947. Permafrost, or Permanently Frozen Ground, and Related Engineering Problems.
Hare, F. K. 1951. Compendium of Meteorology. p. 958, and map, p. 956.