Evaluation of the trend of temperature changes and cloud water fraction in Iran using time series data from SEVIRI sensor products

Rostamzadeh, Hashem; Khorshiddoust, Ali Mohammad; Azizzadeh, Mohammad Reza

doi:10.22111/jneh.2021.36107.1711

Evaluation of the trend of temperature changes and cloud water fraction in Iran using time series data from SEVIRI sensor products

Document Type : Research Article

Authors

¹ Assistant Professor of Climatology, University of Tabriz, Iran.

² Professor of Climatology, University of Tabriz, Iran.

³ Phd Student of Climatology, University of Tabriz, Iran.

10.22111/jneh.2021.36107.1711

Abstract

The purpose of this study is to investigate the trend of temporal and spatial changes in cloud temperature and cloud water fraction in Iran. To achieve this goal, MSG SEVIRI satellite products have been used for the period 2004 to 2017. First, the studied data was set in a regular geographical network with dimensions of 290×380. Then the cloud properties were extracted separately for each month and finally, the time changes of the cloud properties were modeled. To accurately assess the changes in variables, Iran was spatially defined into four separate regions. Based on statistical methods, the trend of time changes was examined through the Mann-Kendall test and Sen’s Slope to reveal the existence of a trend. The results of calculations of indicators showed that water fraction and cloud temperature in Iran, except in May and September, was upward. The highest significant value in the cloud water fraction variable can be seen in June in southern Iran and the lowest in May. Percentage study of the trend showed that the highest significant amount of cloud temperature in June in southern Iran was the lowest in the month. According to the calculations, the lowest amount of cloud water fraction in Iran is located to the north of the country with 25% and the highest amount is located to the west of Iran with 41.6%. Also, concerning high cloud temperatures, southern Iran with 58.3% has the highest amount, and eastern Iran with 25% upward data. The maximum significant percentage of series in the cloud temperature trend in western Iran was 70.83% and the minimum in the south was 45.83%.

Keywords

20.1001.1.26764377.1401.11.31.7.4

Main Subjects

Climatology

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