Climatological Analysis of Shamal Wind

Document Type : Research Paper

Authors

1 Associate Professor of Climatology, University of Isfahan, Faculty of Geographical Sciences and Planning, Department of Physical Geography, Isfahan, Iran

2 Assistant Professor of Climatology, University of Isfahan, Faculty of Geographical Sciences and Planning, Department of Physical Geography, Isfahan, Iran

3 M.Sc Student of Climatology, University of Isfahan, Faculty of Geographical Sciences and Planning, Department of Physical Geography, Isfahan, Iran

Abstract

Shamal wind is one of the local winds with high continuity and diversity in the Middle East and the Persian Gulf region, which often causes dust storms during the summer. In this research, the hourly data of sea level pressure, geopotential height, U and V winds were collected for a period of 44 years from the Copernicus database. First, these data were arranged as a long-term mean, secondly. In order to process the data, principal component analysis and cluster analysis were used. Applying the PCA showed that more than 97% of the variation of the data is explained by three components. The score map of the first component revealed the spatial mechanism of the Shamal summer wind and the eigenvector diagram of the first component of the time period of the Shamal summer wind activity. In addition, the hierarchical cluster analysis on the time-space matrix of SLP showed three-time clusters that represent the time period of the north wind in summer and winter. The analysis of the maps of the monthly pressure distribution pattern showed that the most important active and influential system in the region is the low pressure of the Persian Gulf in the summer season, and the low pressure of the Red Sea in the winter season. The results suggest that the changes in the patterns of the earth's surface at the levels of 500 and 700 hPa are not much significant while it shows a better existence in the 850 and 1000 hPa maps.

Keywords

Main Subjects

References

 
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History

  • Receive Date: 21 October 2023
  • Revise Date: 23 December 2023
  • Accept Date: 16 January 2024

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