陆面过程模式CLM4.5在半干旱区退化草原站的模拟性能评估
投稿时间: 2014-01-05  最后修改时间: 2014-01-05  点此下载全文
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作者单位E-mail
宋耀明 南京信息工程大学 songym@nuist.edu.cn 
中文摘要:利用国际协同强化观测期(CEOP)在中国半干旱区退化草地站通榆站的观测资料对一个较为完善的陆面过程模式NCAR_CLM4.5 (Community Land Model 4.5)的模拟性能进行检验。模拟结果与观测资料的对比表明, CLM4.5能很好地模拟出观测站点辐射通量、水热交换、土壤温湿的空间分布和时间变化特征。但地表吸收的辐射模拟值略低,土壤湿度偏低,地表吸收的辐射及土壤温度等日变化略大;大气强迫变量处于某些特定的形势下时,模拟存在较大误差,如模式在8月底的模拟效果。此外,在冬季对辐射通量、水热交换以及土壤温湿的模拟上均存在较大误差,说明CLM4.5模式在冬季地表物理过程的参数化方案上需要进一步的改进。
中文关键词:CLM4.5模式  辐射通量  水热通量  土壤温湿  性能评估
 
The Evaluation of Land Surface Model NCAR_CLM4.5 at degrated glassland site in Semi-arid Area
Abstract:A well-structured land surface model NCAR_CLM4.5 (Community Land Model 4.5) is evaluated at degraded grassland using the observations at Tongyu site of Coordinated Enhanced Observing Period (CEOP). The results indicate that CLM4.5 can reproduce the spactial distribution and temporal variation of the radiation, water-heat flux, soil moisture and temperature very well. However, the simulated soil absorded solar radiation is slightly lower, the soil moisture is vey lower, and the diurnal variations of soil absorded radiation, soil temperature are slightly bigger. Besides, the simulation errors are very big when the atmospheric condition is very special, for example, at the end of August. In addtion, the simulations departed largely from the observations in winter, which show the physical processes parameterization schemes need to be further improved in winter.
keywords:CLM4.5, surface radiation, water-heat flux, soil moisture/temperature, model validation
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