Climate change due to greenhouse effects (2×CO 2) over China, with focus on Northwest China, is simulated by RegCM2 regional climate model (RCM). The model has a horizontal grid point spacing of 60 km and 16 vertical layers, and is nested to a global coupled ocean-atmosphere model (CSIRO R21L9 AOGCM). Driven by lateral boundary conditions from the GCM, both control (1×CO 2) and sensitive (2×CO 2) experiments of the RCM have been run for 5 years respectively. Model outputs are interpolated in 34 stations ...