Temporal And Spatial Variation Of AOD And Its Relation To The Characteristics Of The Cold Clouds Using Satellite Data Of MODIS

Abstract. Aerosols on a global scale play an important role through the absorption and reflection of solar energy, And impacts on the formation in clouds condensation nucleus in many ecological phenomena. In the present study, we used satellite data, daily atmospheric (Aqua, MYD08-LEV3-COL5.1) In the period 2002 to 2014. Index AOD at 550 nm wavelength extracted in Iran and examined seasonally. Clouds with temperatures less than 273 ° K and below the level of 300 hPa as cold clouds selected and extracted specification, including the data: CER, CF, WV, CTT, And was calculated its spatial relationship with the AOD. The results showed The spatial and temporal distribution of aerosols greatly influenced by generating precipitation system and dust storms was from out of the area. Aerosol and cloud properties were also related. Correlation between AOD and water vapor for the cold season in most parts of area was positive and strong also, the desert and the mountains and the coast was a positive correlation in summer. And other areas showed a negative correlation. AOD correlation with cloud water vapor was same and cold mountainous and coastal areas, especially on the highest showed negative correlation. In summer, mountain and coastal areas also were positively correlated And the rest of region showed a negative relationship. AOD correlation with ratio cloud for the cold season and only a very weak negative correlation was strong on the desert regions most of the negative correlation was found acceptable in summer. CER also a significant association was found for the cold season. Western the mountainous regions in spring and summer in the desert regions of central and eastern negative correlation showed positive correlation.