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在NCAR/LSM的基础上,发展了一个简单的冻土过程参数化力案,并使用苏联 6个站的水文气象观测资料考察了耦合了新方案模式的气候效应。在新方案中,加入了对含冰量的求解和在相变过程中的能量变化;并使用Johanson的方案替代了模式中原有的土壤导热率的参数化方案,考虑了含冰量对土壤水热性质的影响。原模式和改进后模式的模拟结果的比较得到,冻土过程方案能够合理的模拟土壤列中的能量收支及水热性质随含冰量的变化。随着入渗的减少和径流的增加,春季的土壤湿度减小。因此,热通量的分配和土壤温度也产生了相应的变化。
On the basis of NCAR / LSM, a simple parameterization case of permafrost process was developed, and the climatic effects coupled with the new scheme mode were examined by using hydrometeorological observation data of 6 stations in the Soviet Union. In the new scheme, the solution to the ice content and the energy change during the phase transition were added. The Johanson’s scheme was used to replace the original parameterization scheme for the soil thermal conductivity in the model. Considering the effect of the ice content on the soil water Thermal properties. Comparing the simulation result of the original model with that of the improved model, the program of permafrost process can reasonably simulate the energy budget and the hydrothermal properties with the change of ice content in the soil column. With the decrease of infiltration and runoff, the soil moisture in spring decreased. Therefore, the distribution of heat flux and soil temperature also produce corresponding changes.