Influence of macrocyclic climate characteristics on the extreme precipitation in Irkutsk oblast

E. A. Kochugova

doi:10.1117/12.2502871

13 December 2018 Influence of macrocyclic climate characteristics on the extreme precipitation in Irkutsk oblast

E. A. Kochugova

Proceedings Volume 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics; 1083375 (2018) https://doi.org/10.1117/12.2502871
Event: XXIV International Symposium, Atmospheric and Ocean Optics, Atmospheric Physics, 2018, Tomsk, Russian Federation

Abstract

The article considers the long-term dynamics of heavy rains and snowfalls on the territory of Irkutsk oblast for the period from 1950 to 2015. The share of extreme precipitations in the total amount of atmospheric precipitation is estimated. Seasonal features of changes in the frequency of extreme events, manifested in the insignificantly increased precipitation in autumn, typical for the Western synopticoclimatic region, and in winter increase within the Upper Lena and Southern regions of the investigated region are studied. The emerging trends may affect the seasonal changes in the hydrological regime in the watersheds of large rivers. The paper presents the analysis in the relationship between the extreme precipitation events and the macrocirculation mechanisms. Precipitation-forming elementary circulation mechanisms (ECMs) for Irkutsk oblast are identified. It was revealed that the maximum contribution to the extreme precipitation is made by ECM 13l (latitudinal western circulation), 13s (latitudinal western circulation and stationary position) and 12a (longitude northern).

Citation Download Citation

E. A. Kochugova "Influence of macrocyclic climate characteristics on the extreme precipitation in Irkutsk oblast", Proc. SPIE 10833, 24th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 1083375 (13 December 2018); https://doi.org/10.1117/12.2502871

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