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本文利用RegCM3中的BATS陆面模型对青藏高原地区的土壤湿度进行了模拟.结果表明:模式对土壤湿度年循环的模拟与观测较一致,但不同下垫面的土壤湿度模拟结果不同;对植被稀疏地区的土壤湿度模拟夏季偏大冬季较一致,对植被较好地区的土壤湿度模拟冬季偏大夏季较一致;土壤湿度模拟偏差较大的时期对应着降水和温度模拟偏差大的时期.利用后验订正对土壤湿度的订正表明,订正后土壤湿度与观测值的变化比较一致,尤其是对模拟偏差较大时段的订正效果比较明显;订正后的温度和降水基本消除了系统性的偏差.本文认为,订正后的土壤湿度和温度可以为青藏高原地区提供较准确的资料,并在青藏高原多年冻土分布的计算中得到了应用.
In this paper, the soil moisture in the Tibetan Plateau was simulated using the BATS land surface model in RegCM3. The results show that the simulation and observation of the annual cycle of soil moisture are consistent, but the simulation results of soil moisture of different underlying surfaces are different. The simulation of soil moisture in sparsely-populated areas is more consistent in summer than in winter, while the simulated soil moisture in better-vegetated areas is more consistent in winter with larger overshoot in summer, and the period with large simulated-deviation in soil moisture corresponds to a period of large deviations in simulated rainfall and temperature. The revision of the correction to the soil moisture shows that the changes of the soil moisture and the observed values are relatively consistent after the correction, especially for the correction period with large simulation deviation; the corrected temperature and precipitation basically eliminate systematic deviation. It is considered that the revised soil moisture and temperature can provide more accurate data for the Qinghai-Tibet Plateau, and have been applied in the calculation of permafrost distribution in the Qinghai-Tibet Plateau.