| 边界层特征参数对边界层顶垂直速度的影响 |
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| 引用本文： | 赵鸣.边界层特征参数对边界层顶垂直速度的影响[J].大气科学,1994,18(4):413-422. |
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| 作者姓名： | 赵鸣 |
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| 作者单位： | 南京大学大气科学系,南京 210008 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 本文从正斜压及有层结时的边界层相似理论及阻力定律出发，由边界层顶垂直速度与地面湍应力的关系求出了层结、粗糙度、它们的水平梯度及地转风的水平梯度、斜压性对w的影响的解析式，可用于模式计算。计算结果表明层结影响可使w差1-２个量级，不稳定时粗糙度影响也使w差几倍。除地转涡度决定w外，地转风、层结稳定度和粗糙度及其水平梯度也起了重要作用，还讨论了斜压性的影响。
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| 关 键 词： | 边界层特征参数 边界层顶垂直速度 阻力定律 粗糙度 稳定度参数 |
Effects of Boundary Layer Characteristic Parameters on the Vertical Velocity at the Top of Planetary Boundary Layer |
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| Zhao Ming.Effects of Boundary Layer Characteristic Parameters on the Vertical Velocity at the Top of Planetary Boundary Layer[J].Chinese Journal of Atmospheric Sciences,1994,18(4):413-422. |
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| Authors: | Zhao Ming |
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| Abstract: | By using the similarity theory and resistance law of PBL in barotropic and baroclinic conditions,we have derived a formula for the vertical velocity w at the top of the PBL which includes the effects ofstratification, roughness, their horizontal gradients, the gradient of geostrophic wind speed andbaroclinity based on the relation between w and eddy stress in the surface layer. The equation can beused in the model computation. The results show that the effects of the stratification can change w byone or two orders of magnitude, the effect of the roughness during unstable conditions can change w byseveral times, the horizontal gradients of the geostrophic wind, stratification parameter and theroughness all may contribute to the w besides geostrophic vorticity. The effect of baroclinity is also dis-cussed. |
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| Keywords: | characteristic parameters for PBL the vertical velocity at the top of PBL resistance law roughness length stability parameters |
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