Evaluation of air temperature and precipitation changes in the rainy region of western Iran under climate change conditions

The phenomenon of climate change is one of the vital issues for human beings today. Investigation of air temperature and precipitation in the second rainiest region of the country, namely the western half; It is important. In the present study, observational data of 51 meteorological stations in the region were used as baseline data. For the next period up to 2061 horizon, the output of simulation models in the fifth report of climate change was used in two models of induced upper and middle limits, as microscale data. The non-parametric Man-Kendall test was used to investigate the trend of changes in air temperature and precipitation series. The results showed that in the base period based on observational statistics, in most areas in the series and the pattern of air temperature, there is a significant upward trend. For rainfall, a significant decreasing trend was observed in most areas and a negative slope was observed in all stations. Evaluation of the output of the models in comparison with the base period showed that in the western and Zagros regions of the country, the minimum and maximum air temperatures in the coming decades in the upper and middle limits pattern, respectively, will increase by 3.1 and 1.1 ° C, respectively. Will have. Precipitation in some stations will increase slightly in the spring months, but in the annual pattern in most areas the precipitation will be lower than the base period. Therefore, the rainy region of the western half in the Zagros region of Iran will be accompanied by an increase in air temperature and a decrease in precipitation.