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Proceedings Paper

Influence of atmospheric circulation on characteristics of convective and large-scale precipitation in Northern Eurasia
Author(s): F. A. Kozlov; A. V. Chernokulsky; M. G. Akperov; V. Ch. Khon; I. I. Mokhov; A. M. Osipov; V. A. Semenov; A. V. Timazhev
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Paper Abstract

The contribution of dynamic and thermodynamic causes in changes of precipitation character in Northern Eurasia that is expressed in increase of convective and decrease of large-scale precipitation, is still undetermined. Here, we estimate influence of atmospheric circulation on various characteristics of convective and large-scale precipitation in Northern Eurasia using correlation and regression analyses. We estimate different measures for atmospheric circulation including frequency of cyclones and anticyclones, blocking duration, intensity of the main atmospheric centers of action. Correlation and regression analyses were carried out using nonparametric Mann-Kendall correlation and Theil-Sen estimator. We revealed local response of precipitation on circulation characteristics, which strength varies in space and time. For some regions and seasons, opposite responses for convective and large-scale precipitation were found. Therefore, changing character of precipitation over Northern Eurasia can partly be explained by dynamical factors. Nevertheless, the main reason for increase of convective and decrease of large-scale precipitation is presumably associated with thermodynamics factors, namely increase of surface air temperature and humidity that resulting in convective instability growth.

Paper Details

Date Published: 18 December 2019
PDF: 10 pages
Proc. SPIE 11208, 25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics, 112087O (18 December 2019); doi: 10.1117/12.2540724
Show Author Affiliations
F. A. Kozlov, A. M. Obukhov Institute of Atmospheric Physics (Russian Federation)
A. V. Chernokulsky, A. M. Obukhov Institute of Atmospheric Physics (Russian Federation)
M. G. Akperov, A. M. Obukhov Institute of Atmospheric Physics (Russian Federation)
V. Ch. Khon, A. M. Obukhov Institute of Atmospheric Physics (Russian Federation)
Kiel Univ. (Germany)
I. I. Mokhov, A. M. Obukhov Institute of Atmospheric Physics (Russian Federation)
Lomonosov Moscow State Univ. (Russian Federation)
A. M. Osipov, Lomonosov Moscow State Univ. (Russian Federation)
V. A. Semenov, A. M. Obukhov Institute of Atmospheric Physics (Russian Federation)
Institute of Geography (Russian Federation)
A. V. Timazhev, A. M. Obukhov Institute of Atmospheric Physics (Russian Federation)


Published in SPIE Proceedings Vol. 11208:
25th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics
Oleg A. Romanovskii; Gennadii G. Matvienko, Editor(s)

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