پایش عوامل اقلیمی مؤثر بر پدیده گرد و غبار با شاخص DSI در استان تهران

Tehran province is prone to dust phenomenon in the southern, southwestern and eastern parts of the land, and according to the characteristics and conditions of the soil, the share of the region around Varamin and Ray cities is more than the areas of other cities of the province. According to the objectives of the research, the data related to climatic factors affecting the phenomenon of dust (temperature, humidity, precipitation, evaporation, wind, number of days of dust) were collected, reconstructed, extended and completed and in the form of indicators. SPI, SPEI, DSI, Lancaster drought in Mehrabad Meteorological Station in Tehran (due to the availability of statistics in a 30-year period) among geophysical stations, Damavand, Firouzkoh, Dushan, Shemiran, Varamin, Shahryar, Imam Khomeini, Chitgar and Abali in A statistical period of 30 years (1369 to 1398) was examined and analyzed. The number of dusty days in 1377 was the lowest and the highest number of dusty days was recorded in 1388. The important result is that in Mehrabad station, the dust storm drought index (DSI index) in the years 1371, 1375, 1378, 1379, 1380, 1381, 1384, 1389, 1390, 1391, 1392 was almost high and showed the number above one. gives, the noteworthy point is that in most of the mentioned years the values of temperature and evaporation are high and the values of precipitation and humidity are relatively low, which shows the direct relationship between dust storm index (DSI index) and meteorological factors and data in Mehrabad station was in Tehran.