Drought is one of the major natural disasters in the world which has a lot of social and economic impacts. There are\nvarious factors that affect climate changes; the investigation of this incident is also sensitive. Climate scenarios of future\nclimate change studies and investigation of efficient methods for investigating these events on drought should be\nassumed. This study intends to investigate climate change impacts on drought in Karoon3 watershed in the future. For\nthis purpose, the atmospheric general circulation models (GCM) data under Intergovernmental Panel on Climate\nChange (IPCC) scenarios should be investigated. In this study, watershed drought under climate change impacts will be\nsimulated in future periods (2011 to 2099). In this research standard precipitation index (SPI) was calculated using\nmean monthly precipitation data in Karoon3 watershed. SPI was calculated in 6, 12 and 24 months periods. Statistical\nanalysis on daily precipitation and minimum and maximum daily temperature was performed. To determine the\nfeasibility of future periods meteorological data production of LRAS-WG5 model, calibration and verification was\nperformed for the base year (1980-2007). Meteorological data simulation for future periods under General Circulation\nModels and climate change IPCC scenarios was performed and then the drought status using SPI under climate change\neffects analyzed. Results showed that differences between monthly maximum and minimum temperature will decrease\nunder climate change and spring precipitation shall increase while summer and autumn rainfall shall decrease. The most\nincrease of precipitation will take place in winter and in December. Normal and wet SPI category is more frequent in\nB1 and A2 emissions scenarios than A1B. Wet years increases in the study area during 2011-2030 period and the more\ncontinuous drought years gradually increases during 2046-2065 period, the more severe and frequent drought will occur\nduring the 2080-2099 period.
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