Determining the share of internal and external resources of dust in Khuzestan province

The Middle East, Iran and Khuzestan are located on the dry belt of the world and the dust phenomenon is one of its inherent characteristics. Long-Term survey of synoptic stations in Khuzestan Province shows that dust phenomenon with domestic and foreign origin has existed since 50 years ago; however, the share of internal and external resources of dust is not determined by a scientifically valid method. The occurrence of dust phenomenon is reported at each meteorological station every three hours with different codes. If the dust observed is from the source outside the station and comes from another area, it is reported with code 06, but if it is caused with the rise of dust in the area and around the station, it is reported with code 07. In a 15-year common statistical period (2002-2016), the data of dust codes were extracted for 12 synoptic stations and the dust with internal origin was separated from the external origin. Overall, the results showed that the share of internal and external resources was 8.4% and 91.6%, respectively. The output of results was zoned and analyzed using the usual Kriging method in the GIS software environment. Long-term changes in internal and external events at the Ahwaz station, indicating the highest occurrence during the total statistical period (4876), showed that the share of foreign resources increased sharply in recent years.