Investigating The Incoming Weather Systems to Kohgiluyeh And Boyerahmad Province

The land of Iran is located in the Middle East and is limited to the Oman Sea, the Persian Gulf and the Caspian Sea. Iran has a rugged land that is surrounded by mountains and its central part is composed of mountains and deserts. The Kohgiluyeh and Boyerahmad province is located in the southwest of Iran and south of the Zagros mountain range. ۸۰% of the region's area is made up of mountains and hills. In cold regions there are higher heights and more hills and in hot regions there are shorter heights and fewer hills. The plains also make up about ۲۰% of the area of the province, and usually most of the agricultural land is located in the plains. Considering the province's geographical location and multi-climatic nature, most of the systems entering the country affect this province. The role of Sudanese low-pressure in precipitation in Kohgilouye and Boyerahmad province is of great importance. Investigations show that the highest occurrence of Sudanese systems in Iran is in December and winter respectively and also, the maximum humidity entering Iran has been observed in the southwest region, especially in the of Kohgiluyeh and Boyerahmad province. The Mediterranean trough is the main and important climatic factor affecting the climate of Iran during the cold season. In the cold season, the Mediterranean trough is strengthened and its axis is placed on the center of the Mediterranean, and the whole of Iran, including the province of Kohgiluyeh and Boyerahmad, comes under the influence of the western winds. Both summer and winter monsoons are the result of the differences in the annual temperature trend of land and sea. The southeastern region of Iran has a monsoon climate due to the Beshagard mountain range and Jazmorian Hamun. Therefore, if the Indian summer monsoon is strong, it will affect many parts of Iran, including Kohgiluyeh and Boyerahmad province. Also, the central core of Arabian subtropical high-pressure shows considerable latitudinal displacement during the ۶ rainy months of the year, so the beginning and end of rainfall in the province and of course Iran is directly related to the latitudinal displacement of Saudi high-pressure. The location of high-pressure centers on the Arabian Peninsula causes the transfer of hot and dry air by anticyclone currents, and if there is instability in the south of Iran, these instabilities appear as dust storms.

Keywords:

Kohgilouye and Boyerahmad province , Zagros region , weather systems , south west , climate