Climate Change and Climate Disaster

Temporal and spatial analysis of the cloud cover of the lower level of the atmosphere in the area of ​​Iran

Document Type : Original Article

Authors

zeaiynab shamohamadi 1
Dariush Yarah Ahmadi 2
hamid Mir Hashemi 3

1 Faculty of Lorestan UniversityDoctoral student of climatology

2 Faculty of Lorestan University

3 Faculty of Geography Department of Lorestan University

Abstract
The purpose of this research is to investigate the temporal and spatial changes of the low-level cloud cover in Iran. For this purpose, ECMWF ERA5 data with a spatial resolution of 0.25*0.25 was used for the period of 1963-2022. Matlab software was used for statistical and graphical operations. By fitting the linear regression model to the parametric method, the trend of low-level cloud cover in the annual atmosphere was investigated, then the characteristics of the low-level cloud cover of the Iranian atmosphere were investigated using analogs. In the analysis of spatial factors with cloud cover, the role of latitude is more dominant than the influence of other spatial factors The results obtained from the trend analysis showed that about 99.7% of the country has a negative annual trend with a decrease of -0.003% of cloud cover per year. And only 0.2% of the country has positive rainfall and increasing cloud cover per year. The results of the analysis of the cycles, which were not evident in other studies, indicate different cycles during the statistical period, some of these cycles can be attributed to local factors, and others to the influence of macro-scale atmospheric systems and neighbors, and sometimes a combination of the two. It has caused diversity in creating different cycles of cloud cover (low level) in one place

Keywords

"؛ temporal and spatial changes"؛ cloud cover"؛ regression"؛ trend"؛
"؛ coefficient"
Subjects

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