Study of the trend of long-time variations of meteorological parameters in Jiroft, Iran

The current study was carried out to evaluate the variations of meteorological parameters of Jiroft Region, Iran (Lat. 28°35´ N., Long. 57°48´ E., Alt. 601 m.) during 1990-2010. After collecting the data, the linear correlation was estimated between the monthly average of different parameters related to temperature, moisture and other parameters with time. The results showed significant increase in mean minimum and maximum yearly temperature. The decrease in the difference of maximum and minimum temperature during July and the increase in the number of days with maximum daily temperature of ≥30°C implied the regional warming. The decrease in relative humidity in winter and spring was a response to the increased temperature which had led to the increase in total evaporation in summer and autumn. In total, the conditions of the region including the rising temperature, decreasing relative humidity, decreasing annual precipitation and increasing evaporation (especially in summer and autumn) indicate the gradual development of aridity in the region during recent years.