تأثير تغييرات اقليمي بر روند تغييرات سري زماني برخي از پارامترهاي اقليمي در ايران

The Effect of Changes of Climate on The Time Trend for Some Climatic Parameters in Iran

The advancement and industrialization of the human societies increased the concentration of greenhouse gases and caused some change in the climate of the globe throughout the last century. The sign of these climate trends exists in the parameters of meteorology in long changes. Thus, the purpose of this research is determination of time trend and scattering the parameters temperature, wind speed, sunshine and evapo-transpiration in the whole country. After collecting the statistic and information of 36 synoptic station in record lengths 45 years, the process of time trend of these parameters was calculated by slope line trend meaningful test. The result is that the minimum temperature have positive trend in more than 75 percent of stations in autumn and summer and more than 65 percent in winter and spring, and also the time trend of maximum temperature was climbing in 75% of stations in autumn and falling in 60% of them in the winter. The parameter of dew point temperature have negative trend in 80 percent of stations in the spring, autumn and winter seasons and 60% in summer season. Wind speed has the positive trend in 60% of station in summer, autumn and winter seasons. The parameter of sunshine has the climbing process in nearly whole country, too and reference evapo-transpiration is increasing in 65% of stations in annual and seasonal scale.