Analysis of Simultaneous dustfall and rainfall events frequency in southwest of Iran

This paper was carried out to determine the cycle of dust storm in relation with precipitation in 12 months of the year, using processing of digital time series and their correlation with two variables mentioned above. Hence to accomplish the aim of the paper, the frequency of time series for dust storm and rainfall have been analyzed for the long time statistical data collected from 45 synoptic stations(1986-2016), located in the south east of  Iran. In order to understand whether or not any correlation with these two variables, firstly a diagram of the daily changes in dust storm and rainfall cycles was drawn for each month separately. Then, to make sure that the statistics data are normal, the data were analyzed using Kolmogorov-Smirnov test in SPSS software. The results of data normality showed that all statistical data of the parameters used in this research were normal. The results of calculating the correlation coefficients of each month during the course of thirty years, indicated that the correlation of data are significant at (P<0.01 & P<0.05) only in the cold months of the year (January, February, March, April, May, November and December). Also, this study showed that the relationship between the amounts of daily precipitation with an abundance of dust events in the area was negative, and this indicates that the dust could be significantly as reducer or repressive downpours in the region.