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《Plateau Meteorology》 2009-05
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A Comparative Study of the Three Land Surface Models in Simulating the Soil Moisture Profile

ZHANG Shu-wen,LI De-qin,QIU Chong-jian(College of Atmospheric Sciences,Lanzhou University/Key Laboratory for Arid Climate Change and Reducing Disaster of Gansu Province,Lanzhou 730000,China)  
Considering different finite-difference techniques and different numbers of soil layers used for solving the soil moisture equation among the different land surface models(LSMs),three land surface models are compared in the context of simulating the soil moisture profile under the three upper boundary conditions(BCs)(i.e.,a fixed evaporation rate,a fixed infiltration rate and a fixed surface soil moisture) with a finely spaced grid with 101 layers and a coarser grid with 11 layers.Also the impact of soil textures are took into an account.The results show that if the soil along depth is homogeneous(i.e.one soil type with fixed percentages of sand,clay and loam),the main difference among the soil moisture profiles simulated with the three schemes is that the infiltration of soil water with the CLM is faster than that with the other two models,and with the decrease of soil layers from 101 to 11,the soil moisture profile especially at the last three layers is inconsistent with that simulated with the fine grid;if the soil along the depth is heterogeneous(i.e.still one soil type but with different percentages of sand,clay and loam in each of 101 layers),the difference of simulated soil moisture profiles is enlarged and only the soil moisture profile with the ECMWF LSM is continuous.With the change of LSMs and the upper BCs,the rms difference between the soil moistures simulated respectively with the fine and coarse grids is not consistent: The rms difference from the CABLE generally is the largest except with the first upper BC and the RMS with the second and third BCs is larger compared with the first BC.The results imply that the impact of the number of soil layers should be taken into account when we intercompare the different land models or compare the simulating results with the observations.
【Fund】: 国家自然科学基金项目(40775065 40475012)资助
【CateGory Index】: S152
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