Using the Community Land Model version 3.5 of NCAR (CLM3.5) and the observed data atMaqu station in the Qinghai-XizangPlateau during June 2010 to February 2011, a single point simulation experiment has been done. The comparison of the simulated and observed physical variables such as radiationfluxes, energy flux, soil temperature and soil moisture proved that the model simulated the land surface process successfully. The simulation of the upward short wave radiation in summer is better, but bias occurs during winter. The simulation of the upward long wave radiation is good but the result is a little higher. The simulation of the net radiation is also good, the correlation coefficient of the observed value and the simulated value is 0.99 and the bias is -1.28 W·m^-2. The simulated result of the sensible heat flux is higher than the observed value in total while the simulation of the latent heat flux is good enough. The simulation of the soil heat flux is better in summer but worse in winter. A shallower of the simulated snow depth may lead to the bias. The comparison of the simulated and observed soil temperature showed that the result in summer is better than that in winter. The correlation coefficients of the six soil layers are all above 0.98, and the mean bias is -1.80 ℃. The simulated the unfrozen water is successfully when the soil is frozen, which is a big improvement in soil moisture simulation comparing with the previous version of the CLM model. The mean correlation coefficient of the six soil layers is 0.94, and the mean bias is -0.015 m³·m^-3.

Time-depth cross-sections of the observed(a) and simulated(b) daily mean soil temperatures from July 2010 to February 2011. Unit:℃

Time-depth cross-sections of the observed(a) and simulated(b) daily mean soil water content and the simulated daily mean soil ice content(c) from July 2010 to February 2011.Unit:m^3·m^-3