CoLM模式在中国温带混交林和亚热带人工针叶林的水热通量模拟性能评估

Simulation of Latent Heat Flux Exchange between Land Surface and Atmosphere in Temperate Mixed Forest and Subtropical Artificial Coniferous Forest Sites in China by CoLM

利用中国陆地生态系统通量观测研究网络(ChinaFLUX)在长白山温带混交林观测站点和千烟洲亚热带人工针叶林观测站点的强化观测资料,考察了一个较为完善的陆面过程模式(Common LandModel,CoLM)在这两种不同植被类型下垫面的模拟性能,特别是其对潜热通量的模拟。模拟结果与强化观测资料的对比表明,CoLM能较好地模拟出实验站点地表能量平衡的基本特征以及潜热通量的日变化和季节变化。其中长白山站和千烟洲站潜热通量日平均的观测值与模拟值的相关系数分别为0.804和0.692,均通过了0.001的显著性水平检验。总体而言,CoLM在长白山站的模拟效果更好一些,模式对不同植被覆盖类型的土壤—植被—大气间水热传输过程的处理可能是造成差别的原因。

The Common Land Model （CoLM） is a well-structured land surface model. For the purpose of validating CoLM in simulating land-atmosphere interacion, especially latent heat flux, in the temperate mixed forest and subtropical coniferous forest, a simulation for the whole 2003 years was conducted at Changbai Mountain and Qianyanzhou stations which are the reference sites of Chinese Terestrial Ecosystem Flux Observational Research Network （ChinaFlux）. Comparisons with the simulation and the intensified observations show that the CoLM can well reproduce the basic characteristics of surface energy budget and the diurnal and seasonal cycle of the latent heat flux at test sites. In Changbai Mountain and Qianyanzhou staions, the correlation coefficients between the simulated and observed latent heat flux are 0. 804 and 0. 692, respectively, which both have passed the signifient level at α=0. 001. On the whole, CoLM can perform better at Changbai Mountain station than at Qianyanzhou station, which may be resulted from the simulation on soil-vegetation-atmosphere interaction with different vegetation type settings by CoLM.