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利用唐古拉综合观测场活动层及气象塔2007年的数据资料,结合SHAW模型在3种不同地表反照率选取方案下进行模拟试验,对唐古拉地区活动层土壤水热特征进行了单点数值模拟研究.通过观测值与3种模拟值的对比分析,结果表明:SHAW模型能够较为好地模拟多年冻土区地表能量通量、活动层土壤温度特征,而对土壤含水量模拟不太理想,但对其变化趋势模拟较好;在模拟试验中,模型输入参数地表反照率取1-12月各月平均地表反照率后,模型对地表能量通量、活动层土壤温度和湿度的模拟效果有了明显的提高;而用一种地表反照率参数化方案的计算结果对模型输入参数进行修正后,模型对活动层土壤温度和湿度的模拟效果有了明显的提高,对地表能量通量的模拟效果提高不明显.总体上,SHAW模型对高原多年冻土区土壤冻融过程的模拟具有优势,是研究高海拔多年冻土区活动层土壤水热过程较为理想的陆面模型.
Based on the data from the active layer of Tanggula Synthetic Observatory and the meteorological data from 2007 and the SHAW model under three different albedo options, a single point numerical simulation of the soil hydrothermal characteristics of the active layer in the Tanggula region was carried out. The results show that the SHAW model can simulate the surface energy flux in the permafrost region and the soil temperature characteristics of the active layer well, but the simulation of the soil moisture content is not ideal. However, In the simulation experiment, the surface albedo of the input parameters of the model took the average surface albedo of January to December from January to December, and the simulation effect of the model on surface energy flux, soil temperature and humidity of the active layer had obvious . When the model input parameters are corrected by a calculation result of the surface albedo parameterization program, the simulation results show that the model can significantly improve the simulation effect of the soil temperature and humidity in the active layer and improve the simulation effect of the surface energy flux Obviously, SHAW model has the advantage of simulating the soil freezing and thawing process in the plateau permafrost region, Soil water thermal process is preferable land surface models.