To study the transient change of desert-steppe transitional zone, a single point simulation experiment has been done by using the Community Land Model version 4.0 of NCAR(CLM4.0) and the observed data of Microclimate and Evaporation Experiment during July to September 2012. The simulation capability of the model was test by comparing the simulated values with the observed ones. The results showed that:(1) The results showed that:CLM4.0 model can successfully simulate the variation of the surface radiation, turbulent fluxes, soil temperature and water content with the transient changes over the underlying surface, while there are deviations between the two. In the dry and moist surface conditions, deviations between simulated and observed values of the reflected radiation is small, while the grass surface model simulations higher value compared to the observed values;CLM4.0 simulate the trend of surface longwave radiation, but deviations exist on noon and night. (2) The correlation coefficient between the simulated turbulent fluxes and observed values reached above 0.85, but the simulated values are higher than the observed values. (3) The simulated soil temperature and water content are smaller than the observed values. The CLM4.0 has a poor performance of the simulated soil moisture changes caused by heavy precipitation process. Developing applicable soil porosity parameterization schemes over the arid desert-steppe transitional zone, improving soil thermal and hydraulic conductivity simulation can help to improve simulation performance of soil temperature and water content over such underlying surface.
YANG Yang
,
ZUO Hongchao
,
YANG Qidong
,
DU Bin
,
WANG Xiaoxia
,
WANG Mingxing
,
WU Jianjun
. Numerical Simulation of Transient Land Surface Process over Desert-Steppe Transitional Zone in Arid Areas Using Community Land Model[J]. Plateau Meteorology, 2015
, 34(4)
: 923
-934
.
DOI: 10.7522/j.issn.1000-0534.2014.00105
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