Abstract
This paper presents the results of long-term temperature monitoring at the Yakutsk and Zeleny Lug stations, which are experimental sites, for the thermal state of valley permafrost landscapes under the conditions of modern climate warming. An analysis of the long-term data from meteorological stations in the region clearly showed one of the highest trends of increase in the mean annual air temperature in the north of Russia. Here, we established quantitative regularities in the long-term variability of the ground temperature at the bottom of the active layer and at zero amplitude. The dynamics of the ground temperature of the layer of zero amplitude during climate warming indicate the thermal stability of permafrost. The main regulating factor of the thermal state of grounds in permafrost landscapes is short-term fluctuations in the regime of snow accumulation. Active layer thickness is characterized by low interannual variability, weak climate warming responses, and insignificant trends. The results of studies of the thermal regime of soils can be extended to the same types of valley landscapes in the Lena River, and are a reliable basis for predicting heat transfer in natural and disturbed landscapes.
Highlights
In many countries, interest has increased regarding studies examining the influence of modern climate warming on the evolution of the thermal state of the upper horizons of the permafrost under natural conditions and in disturbed areas
According to the results of long-term observations in different regions, researchers have established the effects of modern climate warming on the thermal state of permafrost, and consider the warming of permafrost to be a fact [1,2,3,4,5,6,7]
According to in situ measurements on 124 undisturbed sites in the north-west of Canada, Kokelj et al [2] found a change in the mean annual ground temperature from −3 ◦ C in boreal forests to −7 ◦ C in shrub tundra
Summary
In many countries, interest has increased regarding studies examining the influence of modern climate warming on the evolution of the thermal state of the upper horizons of the permafrost under natural conditions and in disturbed areas. It has become one of the priorities of geocryological research, which is of great scientific and practical importance. At a depth of 20 m, the increase in ground temperature was 1.5 ◦ C in Spitsbergen and 0.4 ◦ C in the Alps. According to in situ measurements on 124 undisturbed sites in the north-west of Canada, Kokelj et al [2] found a change in the mean annual ground temperature from −3 ◦ C in boreal forests to −7 ◦ C in shrub tundra
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