Earth’s Cryosphere», 2017, Vol. XXI, No. 4, p. 28-35
THERMAL REGIME OF THE UPPER PART OF PERMAFROST IN THE TRANSITION ZONE FROM LAND TO SEA, WESTERN YAMAL
A.A. Vasiliev1,2, G.E. Oblogov1,2, I.D. Streletskaya3, V.A. Fedin3,
R.S. Shirokov1, N.A. Zadorozhnaia3
1Earth Cryosphere Institute, SB RAS, 86, Malygina str., Tyumen, 625026, Russia; al.a.vasiliev@gmail.com
2Tyumen State University, 6, Volodarskogo str., Tyumen, 625003, Russia
3Lomonosov Moscow State University, Department of Geography, 1, Leninskie Gory, Moscow, 119991, Russia
This paper analyzes specific features of thethermal regime evolved in the upper portion of permafrost in the transition area between land and sea in western Yamal Peninsula. Based on direct observations, the mean annual temperature of saline sediments is found to be about freezing point in areas where permafrost is subject to degradation, with the depth of zero annual amplitude occurring at 2.5–3.5 m. Permafrost continues to form at low marine laidas, where mean annual temperature of sediments average –3.9 °C. The depth of layer with zero annual amplitude in this area is less than 3–4 m.
Thermal regime of permafrost, climate, coastal zone, Western Siberia, Yamal