Analyzing the Long-Term Changes in the Mediterranean-Red Sea Hybrid System

Document Type : Research Paper

Authors

1 student

2 Professor in Climatology, Department of Geography,University of Zanjan

3 Assistant Professor of Climatology, Department of Geography, Faculty of Social Sciences, University of Zanjan, Zanjan, Iran

4 Professor of Climatology, Department of Physical Geography, Faculty of Geography and Environmental Planning, University of Sistan and Baluchestan, Zahedan, Zahedan, Iran

Abstract

Different pressure centers and synoptic systems affect Iran's climate, and their changes can have significant climatic consequences. In this research, the trend of long-term changes in the number of coupled low-pressure of Mediterranean -Red Sea, as coupled low-pressure centers effective on Iran's rainy climate, was investigated. For this purpose, the geopotential height data of 1000 hp for the 40-year statistical period from 1987 to 2018 was extracted from the European Medium-Term Weather Forecast Center (ECMWF). In total, during this period, 97 low-pressure centers of the Mediterranean-Red Sea circulation were formed over the region. Based on the non-parametric method of chi-square test (chi-score), the trend of cyclone frequency changes was investigated. The results showed that during the investigated period, the number of coupled low-pressure of Mediterranean -Red Sea did not experience statistically significant changes in terms of decades and two semi-statistics. In examining changes on a smaller scale, cross-sectional changes were observed in four-year and two-year periods.

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Main Subjects

References

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Geography and Development
Volume 21, Issue 73 - Serial Number 73
December 2023
Pages 143-165

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History

  • Receive Date: 07 May 2023
  • Revise Date: 01 July 2023
  • Accept Date: 03 July 2023

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