陆面过程模式SSiB在中国西北典型干旱区使用性能的检验

Validation of SSiB Model in Typical Arid Region of Northwest China

利用2000年5月25日～6月15日敦煌试验加强期的观测资料,检验了SSiB模式在我国西北典型干旱区的使用性能.结果表明,在无降水强迫的情况下,模式对净辐射,感热,潜热和地表温度有较好的再现能力;但当加入降水强迫时,模式输出的模拟值与实测值有较大的差别,究其原因这可能与该模式对干旱区土壤水运动过程描述不准确有关.因此,要将此模式应用于典型干旱区,需要做进一步的改进工作.

The performance of the simplified Simple Biosphere model （SSiB） in arid region has been tested in a off-line simulations utilizing the field experiment at Dunhuang Gobi site in Northwest China from May 25 to June 15, 2000. The results show that the model can reproduced the observed surface heat fluxes and ground surface temperature realistically when initialized and driven by the observed atmospheric forcing without precipitation. But the simulated results have great differences when there was precipitation. This study suggests that the description of the soil water process in the model is not so well in arid region. In order to use the SSiB model in typical arid region, some further improved job should be done.