دگرگونی نواحی اقلیمی ایران طی بیش از نیم قرن اخیر (۲۰۲۲-۱۹۶۱).

This research evaluates the influence of climate change on precipitation, temperature, and evapotranspiration in Iran, a region with diverse climatic conditions, using UNEP and Demartonne climate classification systems to explore changes in Iran's climatic zones from the reference period (1961-1990) to the most recent normal period (1993-2022). The results show a decrease in the number of humid climate stations and an increase in semi-arid, dry, and desert stations under both classification methods. MannKendall and Sen's slope analyses reveal significant decreases in precipitation, and increases in temperature and evapotranspiration in over 75% of the stations, with the highest annual precipitation decrease observed in Gorgan, and the highest temperature and evapotranspiration increases in Mashhad and Ahvaz, respectively. The findings suggest that Iran's climate is rapidly shifting towards drier conditions due to global warming, with approximately 13 stations having shifted to drier conditions and 29 stations experiencing increased aridity when comparing the two normal periods. These results align with previous studies, highlighting the urgent need to address the impacts of climate change in Iran and providing valuable insights for policymakers and stakeholders to develop effective strategies for climate change adaptation and mitigation in the region. [ABSTRACT FROM AUTHOR]