By applying climate projections based on 30 Atmosphere-Ocean General Circulation Models (AOGCMs) under representative concentration pathway (RCP) scenarios in the Coupled Model Inter-comparison Project Phase 5 (CMIP5), we assess temperature and precipitation over China in terms of ensemble method. However, significant uncertainties exist among the AOGCM outputs. In this paper, a pseudo global warming (PGW) method is assumed to be a linear coupling of contemporary climatic fields and the difference component of climate perturbation signals by AOGCMs. Surface temperature rise of 1 ℃, 2 ℃, and 3 ℃ and precipitation increase 10%, 20% and 30% above the present level are assessed and a probabilistic approach is used to address the uncertainties. The results show that the ensembles of data are obtained through the PGW method, which efficiently reserves the contemporary climatic information. Warming is expected in all regions of China, with the northern China regions showing greater warming than the southern China regions, especially Tibet region. The increase linear trend of temperature is 0.28 ℃/10a in most parts of northern China. Projected temperature would raise 1 ℃ with above 50% in northern China at the start of 21 century. In the end of 21 century, surface temperature would exceed 2.0 ℃ with more than a probability of 60% in all regions of China. The northern Xinjiang and the southern Tibet would above 50% with a 3 ℃ warming. Projected precipitation would increase, and the increasing precipitation in the northern regions would more significant than in the southern China regions. The projected precipitation would increase more than 30% with a probability of 70% in China.
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