آشکارسازی تغییر اقلیم با بررسی طولانی مدت خشکسالی

Drought can be considered one of the most obvious effects of climate change. A long-term study of drought can highlight the effects of climate change and improve our understanding of the hydrological and ecohydrological response of the area. In order to this aim, researchers have used various indicators. In the current study, 7 selected stations that have long-term statistics of more than 40 years were used to monitor drought in Fars province. Then the drought indices DI, CZI, ZSI, PNI, SPI and MCZI were calculated. The obtained results showed that the DI index is the most appropriate index to determine the characteristics of the frequency of drought changes in the mentioned stations. The results show that the most severe drought occurred in Jahorm, Darudzen and Lar stations in 1992, Shiraz and Fasa stations in 1995, Abadeh station in 1986 and Zarghan station in 2004, and the most severe drought occurred in Jahorm and Lar stations. Shiraz, Fasa and Zarghan in 2008 wet year and Darudzan station in 2017 wet year. The results of this research show that in recent decades, drought intensity and duration is more, which can be an indication of the effects of climate change.