| 不均匀地表产生的中尺度通量的数值试验 |
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| 引用本文： | 张治坤,桑建国.不均匀地表产生的中尺度通量的数值试验[J].大气科学,2000,24(5):694-702. |
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| 作者姓名： | 张治坤 桑建国 |
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| 作者单位： | 北京大学地球物理系,北京,10087 |
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| 基金项目： | 国家自然科学基金资助项目49790020 |
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| 摘 要： | 采用北京大学三维的复杂地形中尺度模式,结合陆面过程模式(SiB),模拟了草原和沙漠并存的下垫面的边界层大气运动.利用SiB模式计算了地表辐射、感热、潜热通量,并且预报地表温度.中尺度模式则模拟了沙漠地区受热抬升,形成的辐合运动,垂直速度的分布,不同高度上水平流场的变化以及中尺度动量和热量通量,把中尺度通量跟湍流通量进行了比较,以确定这种中尺度运动在GCM模式的参数化过程中的重要性.试验表明中尺度通量尤其是热量通量要比湍流通量大很多.
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| 关 键 词： | 参数化 植被 中尺度通量 |
A Numerical Simulation of Meso-Scale Flux over an Inhomogeneous Underlying Surface |
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| Zhang Zhikun and Sang Jianguo.A Numerical Simulation of Meso-Scale Flux over an Inhomogeneous Underlying Surface[J].Chinese Journal of Atmospheric Sciences,2000,24(5):694-702. |
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| Authors: | Zhang Zhikun and Sang Jianguo |
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| Abstract: | A three-dimensional mesoscale numerical model combined with SiB is used to simulate the atmospheric boundary layer over a surface of desert-grassland area. In the SiB model, we calculated the radiation, sensible heat, latent heat flux and the daily variation of temperature at the surface. From the mesoscale model, we can obtain the results such as the convergent motion in the lower boundary layer, the distribution of vertical velocity, the variation of horizontal flow field at different levels, as well as mesoscale momentum and heat fluxes. We also compared the mesoscale flux with the turbulent flux in order to confirm the importance of the mesoscale movement which is usually ingnored in the surface parameterization scheme in GCM models. The results of our numerical experiments indicate that the mesoscale flux, especially the heat flux should not be ignored over the inhomogeneous underlying surface. |
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| Keywords: | parameterization vegetation mesoscale flux |
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