Paper Information

Journal:   JOURNAL OF GEOGRAPHICAL SCIENCES   SPRING 2014 , Volume 14 , Number 32; Page(s) 45 To 69.
 
Paper: 

STUDY ON THE MESOSCALE CONVECTIVE SYSTEMS (MCSS) USING IR BRIGHTNESS TEMPERATURE IMAGES OVER SOUTHWEST OF IRAN

 
 
Author(s):  HEJAZIZADEH ZAHRA, KARIMI MOSTAFA, ZIAEIAN PARVIZ, RAFATI SOMAYEH
 
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Abstract: 

Convective systems cause many hazards in Iran. On the other hands, convective precipitation is the major proportion of total precipitation in southwest of Iran, and has important role on providing water resources. Thus, it is important to assess their climatology characteristics. In this research, spatial and temporal distribution of Mesoscale Convective Systems (MCSs) assessed over southwest of Iran by the use of Global merged IR brightness temperature images obtained from NCEP/NWS and synoptic stations data. MCSs was detected on the basis of temperature, maximum area and duration thresholds (228 k, 10000 km2 and 3 hours respectively) in cases rainfall was more than 10mm during 6 hours and also convective phenomena recorded at least in three stations. A total number of 189 systems were detected during 2001-2005. The analysis revealed that the most of MCSs (54 cases) occurred in December. MCSs initiation location influenced by topography but windward slope of Zagros has not played important role in MCSs formation. In general, they were most predominant across northeast of study area with a decreasing southwestward gradient, that follows topography, but this pattern was different in cold and warm months, so that we have observed the most accordance in warm months and the least accordance in cold months.

 
Keyword(s): MCSS, BRIGHTNESS TEMPERATURE, SPATIAL DISTRIBUTION, TEMPORAL DISTRIBUTION, SOUTHWEST OF IRAN
 
References: 
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