北京市夏季城市强热岛边界层气象特征

近年来,北京市城市化发展迅速,城市气候特征也发生明显变化。应用中科院大气所325m铁塔的梯度观测资料,对发生在北京市的夏季强热岛天气的边界层气象特征进行了分析。结果表明:发生在夜间的北京市夏季强热岛,其边界层存在很强的逆温层结,并且逆温层较厚,低层风速较小,一般不超过2.0m/s;但白天,随着太阳短波辐射的加强,逆温结构很快被破坏,城市热岛强度也迅速减弱。

Meteorological Characteristics of Boundary-layer for Strong Urban Heat Island in Beijing Summer

In recent years, the urbanization in Beijing developed rapidly, and the urban climate characteristics have changed obviously. The meteorological data from the Beijing 325 m tower have been used to study the meteorological characteristics of boundary-layer for strong urban heat island (UHI) in the summer of Beijing. The results show that when strong UHI appears, there is a strong inversion layer in the low atmosphere and the inversion top is very high, the wind near ground is very weak, with wind speed less than 2 m/s. In daytime, with the strong solar radiation, the inversion structure is destroyed soon, and the UHI intensity decreases rapidly.