1 دانشجوی دکتری اقلیم شناسی، مرکز تحقیقات گردشگری، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران .
2 دانشیار اقلیم شناسی، مرکز تحقیقات گردشگری، واحد نجف آباد، دانشگاه آزاد اسلامی، نجف آباد، ایران
3 دانشیار بخش تحقیقات مرتع، مؤسسه تحقیقات جنگل ها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران .
عنوان مقاله [English]
One of the types of natural disasters that cause many environmental and social damages every year in some countries of the world is dust storm. The aim of this study was to investigate dust in Yasuj and Dogonbadan stations. In this regard, codes 1, 1, 3, 3, 31, 32 and 30 dust in these stations on a daily, monthly and annual scale during the statistical period 1313-32 were examined. After reviewing the daily, monthly and annual frequency of codes in all stations, their daily calendar was prepared. Then the trend of the number of days with their dust was examined. The results showed that Dogonbadan station with 2331 dust days had the highest occurrence of dust during the study period. Also, two codes 1 and 1 had the most occurrence in all stations. Code 1 in Dogonbadan station in 1331 and in Yasuj station in 1333 had the highest frequency. Code 1 had the most occurrence in Dogonbadan station in 1311 and in Yasuj station in 1311. Monthly surveys also showed that codes 1 and 1 occurred mostly during the warmer months of the year. So that these codes had the highest frequency in Dogonbadan during July and in Yasuj during May. The results of the dust trend also indicate that in both stations, the cold months of the year have a decreasing trend of dust and the warm months of the year have no trend. On an annual basis, both stations showed an increasing trend.