Permafrost

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#<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]]. A continuous stratum of permafrost is found where the annual [[mean temperature]] is  below about -5&#x000b0;C (23&#x000b0;F).<br/>''Compare'' [[pereletok]]; <br/>''see'' [[active layer]].</div><br/> </div>
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#<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&#x000b0;C (23&#x000b0;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 19:35, 25 April 2012


permafrost

  1. (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.

  2. 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.

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