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Luo Zhexian (Nanjing Institute of Meteorology. Nanjing 210044 )  
The horizontal inhomogeneties of thermal and dynamic characters in the land surface induced by plant-bare soil zones whose space scale are 100-10l km can generate meso-scale circulation and change the local climate. In order to study the effect of the width of plant zone(d) on the meso-scale circulation and the local climate, seven numerical experiments (Ex1-Ex7) have been designed and performed by using a two-dimensional midel. Set d = 5, 7, 9, 11, 13, 15 km, respectively and Ug=2.5 m/s in Ex1-Ex6, where Ug denotes the basic zonal wind velocity, and set d= 9 km and Ug= 0.0 m/s in Ex7. The results are as follows:1. The effect of the width of plant zone on local temperature. A cold island over the plant-zone appears. The intensity of the cold island increases with the width. exhibiting a linear character ristic. 2.The effect of the width of plant zone on the maximum of vertical velocity. There is a most favorable value of the width dc, when d= dc, the intensities of the vertical cells, which are excited by the plant-bare soil horizontal inhomogeneties, achieve their maxima, exhibiting a nonlinear characteristic. 3. The influence of the basic flow on the vertical cells. It seems that the introduction of the basic flow into the model makes more intensive vertical cells. The investigation of the effect of the inhomogeneties induced by plant-bare soil zones on the local climate is a complicated subject.This work is an attempt in this field. Further study is needed to improve the model and experiments,and the work is just under way.
【Fund】: 国家气象局气候基金甘肃省气象局共同资助
【CateGory Index】: P461.7
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