بررسی خشکسالی با استفاده از شاخص SPEI و ارتباط آن با وقوع گرد و غبار در استان تهران

Wind erosion, which is considered as one of the important processes of land destruction and a serious challenge in Iran, occurs due to the interaction between weather and land processes. For the development or adjustment of dust storms, in addition to meteorological conditions, surface factors (land) and vegetation also play an important role. Therefore, in the present research, after reconstruction and completion of statistical data gaps Meteorology, correlation and annual and seasonal trends between the number of days with dust and dust storms and Meteorological parameters such as temperature (monthly, seasonal, annual variability and extreme temperatures), precipitation (monthly, seasonal, annual and extreme events) and evaporation and transpiration are investigated. In this section, the days with dust as a dependent variable during the study period are compared with the simultaneous data of temperature, evaporation and rainfall as independent variables. The results of this part of the study will show the relationship of these variables from the aspect of climate effect on the dust phenomenon. In order to investigate dry and wet years and their effects on the increase or decrease of days with dust, using the SPEI index, the situation of drought years and periods are also investigated.