Document Type : Research Paper
Author
Assistance Professor, Department of Physical Geography, Tarbiat Modares University
Abstract
Abstract
In this research in a survey and analysis of daily maximum temperature data in 13 stations of Khuzestan Province on 21 May to 31 September 2010, the stations were classified into four clusters using the Ward clustering method. Clustering results demonstrated that Abadan and Bostan stations were the warmest stations in Khuzestan province and maximum temperature in Izeh is lower than other stations. Also, based on the average maximum temperature data a separate criterion for determining the super-hot temperatures was presented, i.e., the threshold of 47.17 degrees Celsius. Temporal sequence of warm temperatures occurrence in more than one day temperatures have created super heat waves. During studied time interval, five heat waves were identified in the Khuzestan Province. The warmest super heat wave between five super heat waves was a 4-daily super heat wave which occurred from 5 to 8 July and selected for synoptic analysis. Results of synoptic analysis for mentioned super heat wave proved that institution of a low pressure at ground level and high pressure dominance in middle levels to 500 hp and also the sever increasing in the thickness of the atmosphere that caused on warm air subsidence and abnormal warm air heating and reflow of the earth surface were regarded as dynamic-synoptic agents of super heat wave day occurrence. Analyzing of atmospheric temperature advection maps proved that interneal source of heat air to Iran and Khuzestan Province was hot and dry air advection from the Africa, Arabian Peninsula and Iraq. This process is the effective and creative agent of super heat wave that occurred in 5 to 8 July 2010 in widespread sections of Iran particularly in Khuzestan Province.
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