Ruoergai Wetland Land-atmosphere Interaction Simulation Study

Based on a better understanding of the wetlands physical characteristics, this thesis ismainly focused on the the simulation of land-air interaction on Zoige wetlands, including theevaluation of the performance of modified BATS land surface model in Zoige wetlands byoffline experiments, and some of the improved methods of the model's parameterization.Using a single station data, we evaluate the performance of modified BATS land surfacemodel in Zoige Plateau wetlands through an offline experiment. The modified model proves itsability in simulating the land-atmosphere interaction, but still has its deficiencies. A series ofsensitivity experiments indicate that, as with high moisture content, some physicalcharacteristics of the wetland soil are similar to inland water, which is not well simulated bythe modified BATS, as in this model, wetlands are described closer to ordinary soil types.Based on the result of above experiments and a better understanding of the wetlands physicalcharacteristics, we've improved some parameterization methods of this model. Firstly, wechange the drag coefficient method when applied for wetlands, referring to the method forinland waters. Secondly, based on the physical characteristics of peat, the main component ofZoige wetlands soil, we alter the soil characteristic parameters, and improve the description ofthe soil types in BATS. Thirdly, after an on-the-spot investigation in the plateau wetlands, weamend some parameters about land-cover types. Applied With the three modified methodsmentioned above, the simulation performance has improved remarkably, and the model workswell in offline experiments.Additionally, this study also proves that the transpiration on wetlands is higher than watereven under the same conditions, and that is mainly because of vegetation.