The Effect of Post-Fire Temperature Anomalies on Seasonal Thawing of Soils in the Permafrost Zone f Central Siberia Evaluated Using Remote Data
E. I. PONOMAREV1,2, T. V. PONOMAREVA1,2
1V. N. Sukachev Institute of Forest, SB RAS, 660036, Krasnoyarsk, Akademgorodok, 50/28
2Siberiаn Federal University, 660041, Krasnoyarsk, Svobodny ave., 79
Keywords: дистанционные данные, температура, послепожарные участки, мерзлотная зона, лиственничные леса, сезонноталый слой, remote data, temperature, post-fire areas, permafrost zone, larch forests, seasonally thawed layer
Abstract
The results of the analysis of thermal field dynamics on post-fire areas performed using remote satellite imagery are presented in the paper. The presence of a characteristic "background" was observed in the thermal range (10.780-11.280 μm) for the post-fire areas in the permafrost zone caused by changes in the parameters of the stand, ground cover and litter. The average surface temperature of post-fire areas in larch forests is characterized by increasing up to ΔT = 7.2 ±1.3 oС relative to the background values in summer, which is 20-40 % higher than the temperature of background undisturbed areas. Anomalies of the temperature background remain more than 10 years in the conditions of natural restoration of the ground cover. It is estimated that the rate of temperature anomalies recovery is 2.5 times lower than the dynamics of the vegetative index NDVI. It was evaluated numerically that temperature anomalies on the surface could lead to an increase in thawing depth of the soil layer by up to 20 % more than the average statistical rate.
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