HEAVY PRECIPITATION ON THE IRANIAN COAST OF THE CASPIAN SEA

  • P. A. Toropov Lomonosov Moscow State University
  • A. A. Shestakova Obukhov Institute of Atmospheric Physics
  • A. V. Kislov Lomonosov Moscow State University
  • R. Oji University of Guilan, Guilan, Iran
DOI 10.29006/1564-2291.JOR-2019.47(5).9
Keywords mesoscale modelling, extreme precipitation, Caspian Sea

Abstract

The main goal of this research is to determine the genesis of heavy precipitation on the Iranian coast of the Caspian Sea, to quantify the contribution of various factors to the formation of such precipitation. An analysis of synoptic fields, satellite data and the results of numerical mesoscale modeling showed that the nature of heavy precipitation in the studied region is substantially mixed. The primary cause of precipitation is synoptic processes, most often the activation of cyclogenesis on the polar front under the condition of the invasion of cold air. However, the contribution of the “lake effect” (which is expressed in large values of heat and moisture fluxes from the Caspian Sea surface) and orography (which initiates the oonvergence of moisture on the windward side of the Elborz Mountains) is large and in average is about 50%. With an increase in the temperature of the surface of the Caspian Sea, which is possible in the climatic conditions of the future, percentage of heavy precipitations increases first.

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Published
2019-12-23
Issue
Vol 47 No 5 (2019): Journal of Oceanological Research
Section
International Round Table “The Future of the Caspian: Research Projects and Stud

Transfer of copyrights occurs on the basis of a license agreement between the Author and Shirshov Institute of Oceanology, RAS