عنوان مقاله [English]
The process of climate change, particularly temperature and precipitation is the most important topic in environmental sciences territory. Climate change due to the practical and scientific aspects (environmental, socio-economic impacts) has the increasing importance. Because human systems depending on climatic elements such as agriculture, industry and like, based on stability and climate designed and act. Overall, the temperature and its changes in level, is a manifestation of climate change that almost all theories of climate changes remember it in a way. By studing the temperature change process can be detection the climate changes. The aim of this research is study of probable deviation of the maximum temperature from normal condition in dashtroom station that is positioned in 20 km distance yasuj sity(the center of kohgiluye and boyerahmad province) in which data concerning the maximum temperature of this station during statistical term (1366-1387) have been used .in this study Non-parametric man-kendal method was used that in this method by using the statistic of this test, the significant trend of temperature series changes were tested.
the results coming from data analysis indicated a significant decreasing trend in some time series. In other words maximum temperature is reducing. Moreover, no significant increasing trend was not confirmed by test.
The phenomenan of the maximum temperature reduction in Mordad, Khordad, Dei, Azar and Tir months respectively kendal statistic values (z)-2/43,-2/1, -2/03, -2/02 and -1/99 have been much more than other months. Also the highest reduction of maximum temperature in a seasonal interval in summer to amount -2/52 occurred. In the annual scale too, decreasing trend of maximum temperature during period studied to amount -2.08(z) can be clearly seen. Significant level of variation trend is 5 percent in all series mentioned and in none of series variation trend with 1 percent significant level, were not confirmed by test.