A case study on upper level vertical wind shear

Document Type : Original Article

Authors

1 Assistant Professor of Atmospheric Science and Meteorological Research Center(ASMERC), Tehran, Iran.

2 Master student of Meteorology, Islamic Azad university, North branch

3 Assistant Professor of Islamic Azad university, North branch

Abstract

In this article for two case studies mean sea level pressure data, height and wind at standard pressure levels were extracted from NCEP/NCAR archives relatedto a regular network, on the next step divergence quantities, vertical motion, upper  levels vertical wind shear and thermal winds in different days were calculated by means of formulated equtions.
The results of analysis of upper  level vertical wind shear and thermal wind indicated that the maximum values of these two quantities coincide with jet stream axis. This result expresses the direct correlation between these two quantities and all energy producing interactions within the atmosphere. Moreover, this study showed that the maximum values of  upper  levels vertical wind shear were located between the trough line and the ridge line mid level altitude and their values at high latitudes were fewer than those of low latitudes.

Keywords

Journal of Climate Research
Volume 1396, Issue 31 - Serial Number 31
Vol. 8, No. 31 & 32, Autumn 2017 & Winter 2018
October 2017
Pages 89-102

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