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Russian Meteorology and Hydrology

, Volume 43, Issue 3, pp 143–151 | Cite as

Atmospheric Blockings in Western Siberia. Part 2. Long-term Variations in Blocking Frequency and Their Relation with Climatic Variability over Asia

  • O. Yu. Antokhina
  • P. N. Antokhin
  • E. V. Devyatova
  • Yu. V. Martynova
Article
  • 12 Downloads

Abstract

This paper studies the long-term variability of frequency of atmospheric blockings over Western Siberia in 1948–2015 based on the data of three reanalysis projects. We revealed a decreasing blocking frequency for eight of twelve months. However, since the estimated trends of blocking frequency are small comparing to the significant amplitude of interannual variations, we proposed to divide the entire studied period into several quasi-decadal intervals that differ both in the amplitude of interannual fluctuations of blocking frequency and in trends. The effect of Western Siberian blockings imposed on synoptic and climatic variability of meteorological parameters in Asia was studied. The study demonstrated that in summer teleconnection patterns in temperature and precipitation fields are of the close sign-alternating structure; this indirectly indicates that in Western Siberia the blocking is a part of a large-scale wave mechanism. Like the Ural blockings, the blockings occurring over Western Siberia affect meteorological characteristics within the East Asian monsoon area. In winter time they contribute to lower surface temperature and decreased precipitation in Southeast Asia. In summer during blocking events over Western Siberia, precipitation increases in the East Asian monsoon area.

Keywords

Atmospheric blocking Western Siberia blocking criterion 

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Copyright information

© Allerton Press, Inc. 2018

Authors and Affiliations

  • O. Yu. Antokhina
    • 1
  • P. N. Antokhin
    • 1
  • E. V. Devyatova
    • 2
  • Yu. V. Martynova
    • 3
    • 4
  1. 1.Zuev Institute of Atmospheric Optics, Siberian BranchRussian Academy of SciencesTomskRussia
  2. 2.Institute of Solar-terrestrial Physics, Siberian BranchRussian Academy of SciencesIrkutskRussia
  3. 3.Institute of Monitoring of Climatic and Ecological Systems, Siberian BranchRussian Academy of SciencesTomskRussia
  4. 4.Siberian Regional Hydrometeorological Research InstituteNovosibirskRussia

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