24 CMIP5 Global Climate Models Applied to the Tibetan Plateau
Su, F., Duan, X., Chen, D., Hao, Z. and Cuo, L. 2013. Evaluation of the Global Climate Models in the CMIP5 over the Tibetan Plateau. Journal of Climate 26: 3187-3208.
In the present study, as Su et al. describe it, "the performance of 24 GCMs available in the fifth phase of the Coupled Model Intercomparison Project (CMIP5) was evaluated over the eastern Tibetan Plateau (TP) by comparing the model outputs with ground observations for the period 1961-2005," focusing their attention on both temperature and precipitation.
The five researchers report that with respect to temperature, "most GCMs reasonably capture the climatological patterns and spatial variations of the observed climate," but they say that "the majority of the models have cold biases, with a mean underestimation of 1.1°-2.5°C for the months December-May, and less than 1°C for June-October." As for precipitation, they state that "the simulations of all models overestimate the observations in climatological annual means by 62.0%-183.0%," while noting that "only half of the 24 GCMs are able to reproduce the observed seasonal pattern," including "the sharp contrast between dry winters and wet summers."
The last of these observations clearly suggest, as Su et al. note, that there is "a critical need to improve precipitation-related processes in these models." And the fact that they found 90-year forward projections of both precipitation and temperature to "differ much more among various models than among emissions scenarios" suggests that temperature-related processes have a critical need to be improved upon as well.
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