Abstract:

Scenario is a story that depicts some events in future. Scenario is not a forecast or a prediction of future, it is description of the possible alternative cases. Additionally, the emission scenario is one of the most important components of climate change studies. Climate is the average weather conditions that occur in a wide area in a very long time. Climate change refers to a change in the state of the climate that can be identified by changes in the mean and/or the variability of its properties and that persists for an extended period, typically decades or longer. Turkey is located in the eastern Mediterranean basin, one of the most vulnerable regions to climate change as stated in the IPCC report. Basin-based, regional-based and provincial-based temperature and precipitation projections were developed for minimizing the negative effects of climate change adaptation and to support activities to combat climate change on a sectoral basis. In this study, GFDL-ESM2M global circulation model outputs, developed by the Geophysical Fluid Dynamics Laboratory connected to the National Oceanic and Atmospheric Administration in United States, were used. Selected scenarios (RCP4.5 and RCP8.5) of this study were the most preferred scenarios in the IPCC 5th Assessment Report. In order to obtain high-resolution climatic parameters from thelow-resolutionglobal model data, nesting method (Nested simulations) were used with Regional Climate Model RegCM4.3.4, then temperature and precipitation projections were produced for 2016-2040, 2041-2070, 2071-2099 periods, relative to the 1971-2000 reference period with 20 km resolution in 130x180 grid matrix. According to results; the increase that is expected in annual mean temperature is 1,5°C based on RCP4.5, and 2.5°C based on RCP8.5. In the amount of precipitation, an average decrease of 10-15 mm/year and 105-110 mm/year is expected based on RCP4.5 and RCP8.5 respectively. Changes in mean temperature and precipitation show some differences on regional, watershed, and provincial level due to various geographical features of our country. Fırat-Dicle basin draws attention as the most sensitive basin in terms of temperature increase. In terms of average annual precipitation change, it is expected that basins, located in Mediterranean Region, will be the most sensitive regions

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