COMPARISON OF PERMAFROST CONDITIONS IN CANADA AND THE USSR

A COMPARISON OF PERMAFROST CONDITIONS IN CANADA AND THE USSR INDICATES SIGNIFICANT DIFFERENCES BETWEEN THE TWO COUNTRIES. THOUGH THEY LIE ROUGHLY AT THE SAME LATITUDE IN THE NORTHERN HEMISPHERE, THE PERMAFROST REGION EXTENDS FARTHER SOUTH IN SIBERIA THAN IN CANADA. GROUND TEMPERATURES AT THE DEPTH OF ZERO ANNUAL AMPLITUDE ARE SIMILAR IN BOTH PERMAFROST REGIONS, BUT PERMAFROST IS MUCH THICKER IN USSR. AT THE BOUNDARY OF DISCONTINUOUS AND CONTINUOUS ZONES, PERMAFROST RANGES IN THICKNESS FROM 60 TO 100M IN CANADA AND 250 TO 300M IN SIBERIA. THE THICKEST KNOW PERMAFROST IN CANADA IS ABOUT 500M IN CONTRAST TO 600M AND MORE IN SIBERIA. MANY SIMILARITIES AND SOME MAJOR DIFFERENCES EXIST IN THE CLIMATIC AND TERRAIN CONDITIONS OF CANADA AND THE USSR. A SIMILAR RELATIONSHIP BETWEEN MEAN ANNUAL AIR TEMPERATURES AND THE DISTRIBUTION OF PERMAFROST EXISTS IN BOTH COUNTRIES, BUT SUMMERS ARE WARMER AND WINTERS ARE COLDER IN SIBERIA. UNDER SIMILAR CONDITIONS IT IS POSTULATED THAT THE ACTIVE LAYER CAN BE THICKER IN SIBERIA, ALTHOUGH THERE ARE NO COMPARATIVE OBSERVATIONS TO VALIDATE THIS SUGGESTION. DIFFERENCES IN THE HISTORY OF CONTINENTAL GLACIATION BETWEEN CANADA AND THE USSR ARE PROBABLY AMONG THE MOST IMPORTANT FACTORS CAUSING VARIATIONS IN PERMAFROST CONDITIONS. DIFFERENCES IN VEGETATION, PARTICULARLY DOMINANT TREE SPECIES, ARE ALSO SIGNIFICANT. ANNUAL SNOWFALLS ARE GENERALLY GREATER IN NORTHERN CANADA THAN IN SIBERIA. SURFACE AND SUBSURFACE FEATURES ASSOCIATED WITH PERMAFROST OCCUR WIDELY IN BOTH COUNTRIES. SOIL PROFILES OF THE ENTIRE QUATERNARY PERIOD HAVE BEEN DESCRIBED IN MANY UNGLACIATED AREAS IN EASTERN SIBERIA, BUT NONE HAS BEEN FOUND IN CANADA. /CGRA/

  • Supplemental Notes:
    • No 225, pp 741-751, 2 FIG, 12 PHOT, 31 REF
  • Authors:
    • BROWN, R J
  • Publication Date: 1967-8

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00237281
  • Record Type: Publication
  • Source Agency: CANADIAN GOOD ROADS ASSOCIATION
  • Files: TRIS
  • Created Date: May 26 1994 12:00AM