Abstract: As the atmospheric concentration of carbon dioxide and other trace gases increases, changes in global and regional climatic con-ditions will lead to a wide range of hydrologic impacts, including changes in the timing and magnitude of runoff and soid moisture, Some methods for evaluating the regional hydrologic impacts of global climatic changes are presented in this paper.Furthermore, these methods can be combined with state-of-the-art information from general criculation models of the climate and with plausible hypothetical climate-change scenarios to generate information on the water-resource implications of future climatic changes.
In order to assess the climatic variation and to determine the impacts on meltwater from glacier and snow, variations of runoff from several glaciated basins in Eurasia during last 30-40 years are also analysed.It is clear that the effect of dry and hot climate have intensively advanced the ablation of glacier and snow in whole Tianshan Mts since 1970's.Runoff of rivers fed by glaciers increases markedly but that by precipitation decreases.