Relation between mean annual air and ground temperatures in the permafrost region of Canada

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ConferenceProceedings: Permafrost International Conference: 1963-11,
Pages241246; # of pages: 6
SubjectPermafrost; Soils; temperature; air; atmospheric temperature; Sol; température; air; sol (terre); température atmosphèrique
AbstractClimate is basic to permafrost formation and is a most important factor influencing its existence. Fluctuations in the southern boundary of permafrost are generally within the confines of the 25 and 30 degree F mean annual air temperature isotherms across Canada. Local variations are influenced by microclimatic and terrain features. In permafrost the temperatures decrease steadily from the ground surface to a depth of about 50-100 ft. but below this the temperature increases steadily under the influence of the heat from the earth's interior. Ground temperatures in permafrost are always warmer than mean annual air temperatures, varying from 1 degree F at Keg River, Alta to 12 degrees F at Taurcanis, N.W.T. Complications arise for good comparisons because the mean annual ground temperatures decrease with depth to about 50-100 ft and then steadily increase and further, some individual ground temperature values above the level of zero temperature amplitude may be higher or lower than the annual mean depending on depth and time of year. It appears that an accurate prediction of mean annual ground temperature and the occurence of permafrost at a site solely from the mean annual air temperature is subject to variations by other climate and terrain factors. Many more observations are required before anything more than a broad relation can be established.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number9272
NPARC number20378541
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Record identifier364bd45f-3fc7-41e1-83b0-1c5f45f4a213
Record created2012-07-24
Record modified2016-05-09
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