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Investigation of Dust-Causing Factors in Western Iran and Its Effects on Climate Changes

Kermanshah, Amirhassan | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42566 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Agha Mohammad Hossein Tajrishi, Massoud
  7. Abstract:
  8. study has been divided into two main sections. In the first section, six climate variables have been analyzed in 15 synoptic stations in Iran’s west region through parametric and non-parametric statistical tests in order to find the climate varibility. The results illustared that, in general, there is no climate variability in the western part of Iran. Investigation of climatic indices and changes in the meteorological data in the entire study area (including a large portion of Middle East), in a 30 year period (1979-2008), is eloquent of a drought during the last 10 years of the period. In the second section, by means of the Aerosoal Index (AI) extracted from TOMS and OMI tools, it was observed that the western region of Iran was under the influence of one dust transmission system.The effect of this system from the north to the south of the region has increased due to the approach of the southern parts towards the dust source. From May to July, the stations have had the highest dust aerosols. Gradually by getting the air warmer in the stations and decreasing the average rainfall which has an important role in the dust contorl process, the average wind speed will increase which cuases the growth in dust density of the air. By correlation analysis between climate variables and AI in Abadan and Ahwaz stations, it was found that rainfall in spring, winter, and fall plays a significant role in controling the aerosol in the stations. The results in this section showed that the average monthly temperature has a positive correlation with AI and the monthly relative humidity has a negative correlation with AI except for a vast region in the north of Saudi Arabia. Moreover, the results indicated that there is a positive correlation between zonal wind speed at surface level in Iraq and AI in the stations. Also the transportation of dust into the western region of Iran is caused by zonal winds at different levels. In general, there is no precise answer to the theory of climate change in Iran’s western region because of dust phenomena, but it can be said that the dryness which governs the region is the main cause of dust increase in the western region of Iran in recent years
  9. Keywords:
  10. Dust ; Remote Sensing ; Climate Change ; Middle East

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