ISSN 2073-3402 (Print)

List of issues > Series «Earth Sciences». 2017. Vol. 22

Investigation of the Influence of Meteorological Factors on the Occurrence and Spread of Forest Fires in the Irkutsk Region

L. V. Golubeva, I. V. Latysheva, K. A. Loshchenko, A. S. Shcheblykin
The relevance of research on meteorological factors in the occurrence and spread of forest fires in the Irkutsk region is primarily due to the fact that about 80 % of the territory is occupied by forests, of which ~ 36 % are characterized by a high degree of natural fire danger. In most cases, fires are caused by a person, but the area of forest fire spreads largely depends on combinations of weather and climate factors. In this paper, the contribution of meteorological factors and synoptic conditions to the formation and propagation of forest fires in the territory of the Irkutsk region. According to meteorological stations in the Irkutsk region, the fire danger index according to Nesterov VG was calculated. in the period from April to September 2005–2016 in the taiga, forest-steppe and steppe zones. The meteorological conditions for the occurrence of forest fires in the taiga and forest-steppe zones are characterized by the predominance of a high hazard class. A comparative analysis of the results obtained with the calculated values of the Nesterov index on the territory of the Republic of Buryatia and Yakutia (SAHA) is carried out. Long-term variations of atmospheric pressure and the Palmer index (PDSI) have been studied, which indicate an increase in the frequency of dry periods in the Irkutsk region in recent decades. Synoptic analysis of near-surface atmospheric pressure maps for cases with maximum and minimum values of the fire hazard index during the warm period of 2010–2015 is performed. The prevailing types of pressure fields are determined, which determine the high level of fire hazard in weather conditions in the region under study.
forest fires, Irkutsk region, droughts, meteorological factors, synoptic conditions
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