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Climate change leading to global warming affects the earth through many different ways such as weather (temperature, precipitation, humidity and the other parameters of weather), snow coverage and ice melting, sea level rise, hydrological cycles, quality of water, agriculture, forests, ecosystems and health. One of the most affected areas by climate change is hydrology and water resources. Regions where majority of runoff consists of snow melt are more sensitive to climate change. The first step of climate change studies is to establish trends of significant climate variables including precipitation, temperature and flow data to detect any potential climate change impacts already happened. Two popular non-parametric trend analysis methods, Mann-Kendal and Spearman-s Rho were applied to Upper Euphrates Basin (Turkey) to detect trends of precipitation, temperatures (maximum, minimum and average) and streamflow., {"references":["Houghton et al., IPCC Climate Change 2001: The Scientific bases.\nContribution of Working Group I in the Third Assessment Report of the\nIntergovernmental Panel on Climate Change. Cambridge University Press, Cambridge,New York, 2001.","Trenberth et al., Observations: Surface and atmospheric climate change.\nIn Climate Change 2007: The Physical Science Basis, Contribution of\nWorking Group I to the Fourth Assessment Report of the Intergovernmental\nPanel on Climate Change. Cambridge University Press,\nCambridge,New York, 2007.","K.S. Abdo, B.M. Fiseha, T.H.M. Rientjes, A.S.M. Gieske and A.T. Haile,\nAssessment of climate change impacts on the hydrology of Gilgel Abay\ncatchment in Lake Tana basin, Ethiopia. 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