Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2018, Vol. 15, No. 5, pp. 85-95
Remote monitoring of post-fire effects in the permafrost zone of Central Siberia
E.I. Ponomarev
1, 2 , T.V. Pnomareva
1 1 Sukachev Institute of Forest SB RAS, Krasnoyarsk, Russia
2 Siberian Federal University, Krasnoyarsk, Russia
Accepted: 08.08.2018
DOI: 10.21046/2070-7401-2018-15-5-85-95
The paper discusses the dynamics of reflectance and thermal anomalies in post-pyrogenic plots under cryolithozone conditions, studied using Terra/MODIS imagery. Long-term consequences of the “background” in the thermal range (10.780–11.280 μm) are considered, that effect the temperature and water regimes of soils. Rising of the average temperature has been instrumentally recorded for the post-fire plots in the larch forests of Siberia’s cryolithozone in relation to background values by up to ΔT = 7.2±1.3 °C during the summer, which is 20–40 % higher than the temperature of the undisturbed plots. Temperature anomalies remain more than 10 years under the conditions of natural restoration of the ground cover. It has been shown that excessive surface heating can lead to an increase in the depth of thawing soil layer by 20 % deeper relative to the average statistical rate. The hypothesis has also been tested of a correlation between the relative forest burning index within the boreal river basins and long-term series of the river discharge. In some seasons, a response to pyrogenic effects is recorded, expressed as an abnormally low discharge during summer period (r ~ –0.57…–0.83, p < 0.05).
Keywords: remote data, Terra/MODIS, temperature, post-fire areas, cryolithozone, seasonally thawed layer, river discharge
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