Identification dust storms In West and South West of Iran Using remote sensing technology

One of the most important environmental challenges which exists in the Middle East and Iran in recent years is the phenomenon of dust. As regards the Western half of Iran is in proximity to large deserts and continually effects the country deserts dust and specially that western half and also the unpleasant effects that these dusts have on environment and people health; so the purpose of this study is the use of Combined method (E-synoptic satellite) for exact recognition of this environmental risk. In this study Terra / MODIS satellite images for dust event of 1 July 2008 West of Iran and the data of Nova Organization database includes: Geopotential height. (HGT) 500 HPa level, the condition of Sea Level Pressure (SLP) and the circuit and Meridional wind components from NECP website have been used. Quantitative indicators of dust detection on satellite images includes NDDI, BTD, BTDI and LRDI indicators, visual dust detection indicators includes false and true color combination and false color combination patterns. The results of applying the quantitative indicators to detect dust on MODIS images showed that the dust indicators and creating the false color image so that it can detect the areas covered by dust directly for dust detection of Iran on MODIS images has enough and good ability. Also the review of synoptic weather map for July 1 showed that the establishment of a low pressure system on Iraq and the south of Persian Gulf and the coordinated deep Landing effect on ascendent area at the same time with Azores high pressure weakens provides the perfect background for dust transfer to the area atmosphere.