Variation of Solar Attenuation with Height over an Urbanized Area

摘要

The information presented in this paper is directed to environ-mental scientists who are concerned about the quality of air over an urban area. Specifically, the purpose of this study is to show quantitatively the magnitude of solar attenuation for individual air layers in the lowest 1000 m of an urban atmosphere. This reveals dramatically the diverse variation of mass concentration with height. The information is useful in urban planning, in site selection, and in air quality control.nThe data were gathered on different roof top levels and on heli¬copter flights using modified Volz sun photometers, psychrometers, hot-wire anemometers, and an electrical thermometer.