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利用中国科学院那曲高寒气候环境观测研究站冻融期(2013年3月1日至6月1日)的气象和土壤观测资料,通过陆面模式Co LM对那曲地区土壤冻融过程进行了数值模拟。模拟结果表明,Co LM模式对土壤温度、感热通量和潜热通量的模拟与观测较吻合,但对土壤湿度的模拟偏差较大,而模式冻融参数化方案的不足是造成这一较大偏差的主要原因。根据热力学平衡下土壤水势与温度之间的关系以及Clapp-Hornberger经验公式对冻融参数化方案进行了优化,优化冻融参数化方案后,模式能够更真实地模拟出土壤冻融过程特征,尤其是对土壤湿度偏低的现象改进较大。
Based on the meteorological and soil observations from the Naqu alpine weather observatory at the Chinese Academy of Sciences during the freeze-thaw period (March 1 to June 1, 2013), the soil freeze-thaw process in the Naqu area was numerically simulated . The simulation results show that the Co LM model agrees well with the simulation and observation of soil temperature, sensible heat flux and latent heat flux, but the simulated deviation of soil moisture is relatively large. However, The main reason for the big deviation. Based on the relationship between soil water potential and temperature under thermodynamic equilibrium and the Clapp-Hornberger empirical formula, the freeze-thaw parameterization scheme is optimized. After optimization of the freeze-thaw parameterization scheme, the model can more accurately simulate the characteristics of soil freeze-thaw process, especially The phenomenon of low humidity of the soil is greatly improved.