藏北高原土壤热传导率参数化方案的优化和检验

Optimization and Test of Soil Thermal Conductivity Parameterization Schemes in Northern Qinghai-Xizang Plateau

利用中国科学院大气物理研究所发展的冻土模式FSM中原始和优化的土壤热传导率参数化方案分别对青藏高原中部NewD66观测点土壤温度进行了模拟。结果表明,该模式中原始的土壤热传导率参数化方案高估了实际的土壤热传导率,因而导致模拟的土壤温度偏高。优化的参数化方案较原始参数化方案更能真实地模拟出土壤温度的变化,尤其对深层土壤温度的模拟效果更加显著。这些表明应用优化参数化方案的FSM模式对土壤温度模拟的准确性比原模式有所提高。

An numerical simulation experiment on central Qinghai-Xizang Plateau is presented using the Frozen Soil Model （FSM）. FSM is an universal soil model, which could apply to the permafrost and non- permafrost soil. An numerical simulation experiment is carried out with the original as well as the opti- mized soil thermal conductivity parameterization schemes. The results show that the original soil thermal conductivity parameterization schemes overestimated the real soil thermal conductivity, thus lead to the higher simulated soil temperature. The optimized scheme simulated better, especially for the temperature of deep soil. The numerical experiment results above show that the optimized soil thermal conductivity pa- rameterization schemes are more accuracy than the original schemes in soil temperature simulation.