中国西北地区荒漠绿洲大气内边界层的数值模拟

本文用二维中尺度土壤－植被－大气连续体数值模拟了黑河地区绿洲和周围荒漠袒上垫面物理特征差异引起的内边界层结构。得到了绿洲上游荒漠至绿洲和从绿洲至其下游荒漠两重下垫在突变过程大气运动所产生的风速内边界层，温度内边界层和湿度内边界层的空间和时间特征及其这两种情况边界层的结构差异。

NUMERICAL SIMULATION OF ATMOSPHERIC INNER B0UNDARY LAYER OVER OASIS AND ITS NEARBY DESERT IN NORTHWEST CHINA

In this paper, a developed mesoscale numerical model of soil - vegetation - atmosphere continumm is used to simulate the atmospheric inner boundary layer caused by the differences of physical properties of underlying surface between oasis and its nearby desert. Spatial distribution and diurnal variation of atmospheric inner boundary layer of wind speed, potential temperature and specific humidity, in the changes of underlying surface from upstream desert of oasis to oasis and from oasis to its downstream desert, are obtained, The results show that the effects of the thermodynamical circulation between oasis and its nearby desert on atmospheric boundary layer are different in wind speed, potential temperature and specific humidity. The inner boundary layer of potential temperature is clear at daytime, but not clear at night. And the inner boundary layer of wind speed and specific humidity is always clear at daytime or at night. The compaTison of simulated resu1ts to partial observed results shows that the simulated results are mainly in agreement with the observed data at HEIFE station.