Long-term air and ground temperature records from the Canadian cordillera and the probable effectsodor moisture changes
Long-term (up to 14 year) measurements of air and ground temperature records from three stations in permafrost in the Canadian Cordillera show that variations in apparent trends of ground temperature at different depths in the ground are relatively common and are often unrelated to variations in air...
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| Format: | Text |
| Language: | English |
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1990
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.562.7816 http://pubs.aina.ucalgary.ca/cpc/cpc5-151.pdf |
| Summary: | Long-term (up to 14 year) measurements of air and ground temperature records from three stations in permafrost in the Canadian Cordillera show that variations in apparent trends of ground temperature at different depths in the ground are relatively common and are often unrelated to variations in air temperature. They are not confined to the upper part of the perm&ost zone as suggested previously in the literature and appear to be due to changes in the moisture content with time. They imply (1) that studying climatic change by monitoring ground temperatures will normally be unsuccessful unless an arid area is chosen; (2) that basing engineering designs on measurements of ground temperatures alone will be hazardous; and (3) that the ground-temperature profile with depth is an unreliable indicator of past climatic changes. Des mesures B long terme (jusqu'i 14 am) de la temp6rature de l'air et du sol relevbs B trois stations dam le perg6lisol dans la Cordillkre canadienne r6vklent que les variations de temfirature B diff6rentes profondeurs dans le sol sont relativement fihuentes et que, souvent, elles ne sont pas l ibs aux variations de la temp6rature de l'air. Elles ne sont pas confinbs la partie sup6rieure du perg6lisol a m m e le suggkre la litthature. et elles sernblent attribuables aux variations de la teneur en eau en fonction du temps. L'auteur conclut (1) que 1'6tude du changement climatique b a d e sur le suivi des temperatures du sol sera vraisemblablement peu concluante sauf dans les sites secs; (2) qu'il serait dangereux de concevoir les ouvrages de g h i e uniquement selon les tempkratures du sol; et (3) que le profil des temp6ratures du sol en fonction de la profondeur n'est pas un indicateur fiable des changements clirnatiques passes. |
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