1 گروه جغرافیا،دانشکده علوم انسانی،دانشگاه میبد، یزد
2 دانش آموخته دکتری جغرافیا طبیعی - آبوهواشناسی، دانشگاه یزد- یزد- ایران
عنوان مقاله [English]
Extreme temperature and precipitation events represent a major category of climate hazards, which are especially frequent in arid and semi-arid regions. Therefore, to study extreme events associated with climate hazards, in this paper four indices of extreme temperature events including annual count of frost days (FD), annual count of ice days (ID), annual count of summer days (SU) and the annual count of tropical nights (TR) as well as rainfall more than of 30 mm and snowfall more than 15 cm derived from 18 synoptic stations of Fars province over an 8-year period (2006-2013) were used.
After collecting data on annual frequency of each climate hazard, the zoning maps for frequency of each event were prepared using ordinary Kriging method. The results of this study showed that the maximum and minimum frequency of frost days belonged to the city of Safashahr (946 days) and Lamerd (8 days), respectively. The maximum and minimum frequency of summer days was observed in Lamerd (2293 days) and Eqlid (1095 days), respectively. The city of Izadkhast in the northernmost region of the province reported the highest frequency of ice days (28 days) while 12 cities in the province did not report any event of ice day. The highest and lowest frequency of tropical nights was reported in Lamerd (1176 days) and Safashahr (1 day), respectively. Further, the highest and lowest frequency of heavy rainfall (over 30 mm) was reported in Sepidan (50 days) and Abadeh (2 days), respectively. Snowfalls more than 15 cm was only reported in Sepidan with a frequency of 3 days, and other stations did not report this event.