Urban Effects on the Convective Boundary Layer
Urban Effects on the Convective Boundary Layer
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DOI：
10.1175/1520-0469(1984)041
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发表时间：
1984
影响因子：
3.1
通讯作者：
P. Hildebrand;Bernice Ackerman
中科院分区：
文献类型：
--
作者：
P. Hildebrand;Bernice Ackerman
摘要本文用一架装有仪表的飞机研究了城市地区对湍流对流边界层的影响。从三个未受干扰的低风速天的数据来描述城市对湍流廓线的热量，水分，动量和湍流强度的影响。据观察，城市地区的情况与农村地区大不相同。城市地区大大增强了地面热通量，因此湍流的垂直分量。增强的城市垂直湍流增强延伸到城市边界层，导致更强的夹带通过城市逆温比农村。这反过来又会导致城市逆温区温度、湿度和应力的垂直通量增强。城市粗糙度对边界层结构的影响被观察到是小的城市加热的微风情况下研究的影响相比。
Abstract The influence of an urban area on the turbulent convective boundary layer is studied using an instrumented aircraft. Data from three undisturbed days with low wind speeds are presented to describe the urban effects on turbulent profiles of heat, moisture, momentum and turbulent intensity. The profiles in the urban Area are observed to be considerably different than the rural. The urban area substantially enhances the surface heat flux, hence the vertical component of turbulence. The enhanced urban vertical turbulent intensifies extend through the urban boundary layer, resulting in stronger entrainment through the urban inversion than the rural. This, in turn, results in enhanced vertical fluxes of temperature, moisture and stress at the urban inversion. The effects of the urban roughness on boundary-layer structure are observed to be small in comparison with the effects of urban heating for the light wind cases studied.