北京城市重烟尘雾与水雾过程的边界层结构

Boundary Layer Characteristics of Urban Heavy Smog and Fog in Beijing

分析 1999年 11月 1日至 12月 2 0日北京城市雾综合性观测试验中 5次雾过程的实测资料 ,对如何区分重烟尘雾与水雾过程给出了判定方法 ,并对重烟尘雾与水雾过程的边界层结构特征作了探讨。主要结论为 :从能见度、相对湿度、长波辐射平衡 3个方面可以区分重烟尘雾过程和水雾过程 ;由于重烟尘雾和水雾的物理化学性质差异很大 ,对城市大气边界层结构产生的影响也不同 ,因此造成它们在相对湿度、逆温层、风速分布、水汽变化等方面也有很大差异。

Urban heavy smog is a serious environmental problem. Based on the field observation in Beijing from November 1 to December 20 of 1999, differences between heavy smog and fog are analyzed, and the structures of the atmospheric boundary layer for heavy smog and fog are discussed. Some results are founded. For example, heavy smog and fog can be distinguished from visibility, relative humidity and long-wave radiation equilibrium. The differences of heavy smog and fog in physical and chemic natures induce the boundary layer profile differences in relative moisture, inversion layer, wind speed, vapor, etc.