Reviews atmospheric mechanisms governing the occurrence of days with dust city of Tabriz and tracking using HYSPILIT model and MODIS Image

In order to investigate the mechanisms governing the occurrence of days with dust weather in Tabriz weather station in the current weather data from 1990 to 2102 were used. Continuing to identify circulation patterns in middle levels, 8 × 282 matrix was formed, and were selected the days that had continuing for more than 24 hours as, days with dust particles. Then, to identify the causes and types of dust storms prevailing in the event of data extraction and analysis in heights of 500 hPa and were made on which they factor and cluster analysis for every day. To better understand the atmospheric structure-regional meteorological patterns of different levels of pressure data derived from the National Center for environmental predictions / Atmospheric Research (NCEP / NCAR), and for tracking airborne particles of dust Lagrangian model HYSPILIT at the end of the transitional View MODIS images were used in each pattern visible band. The results showed that at the time of the incident ten days of dust in middle levels with a total of 93% of the total variance diffraction data were active had explained that the first factor of 62.5 percent. It turned out that three types of daily occurrence of this phenomenon has been the rule in the region, the first type: cut the Black Sea and East Mediterranean in the south, low pressure, second type: Deep trough from the Arctic to the Middle East and West: Third type a short wave Syria and Iraq have been deployed in the West.