Analysis of Geopotential Altitude Trend on Iran under the Influence of Climate Change

جغرافیا و مخاطرات محیطی

Article 11, Volume 11, Issue 1 - Serial Number 41, March 2022, Pages 201-216   

Document Type: Research Article

DOI: 10.22067/geoeh.2021.70712.1068

Authors

Zahra HejaziZadeh¹; Bohloul Alijani¹; Hoosien Asakere²; Mokhtar Fatahian^{* 3}

¹Professor in Meteorology, Faculty of Geographical Sciences, Kharazmi University of Tehran, Tehran, Iran

²Professor in Meteorology, Faculty of Humanities, Department of Geography, Zanjan University, Zanjan, Iran

³Department in Geography, Faculty of Literature, Kharazmi University of Tehran, Tehran, Iran

Abstract

Trend variations in large-scale atmospheric systems like subtropical high pressure play a significant role in climate change. In this study, to achieve the objectives, mid-level atmospheric geopotential altitude data were employed based on the European Center Database of Atmospheric Medium-Term Forecasting. The data that have a spatial resolution of 1*1 degree of curveand are collected on a daily average. The statistical period of the research ranges from 1980 to 2018 for Iran and included 155 cells. Mann-Kendall trend test was used to explore the geopotential altitude trend on Iran. The results showed that the atmospheric geopotential altitude on Iran in June, July, and August has an increasing (positive) trend which is at the significant level of 1.96. The decreasing trend of geopotential altitude in the eastern and southeastern regions of Iran is remrkable. Moreover, in all the investigated months, Iranian atmosphere altitude in the central, western and northwestern regions had an upward trend, which is generally influenced by the high-pressure subtropical level. These changes cause abnormalities in climatic patterns of the regions. The study also showed that continuing subtropical pressure stack on top of ever-increasing trend in the region is significant.

Keywords

Geopotential Altitude; Trend Analysis; Climate Change; Iran

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