A Study on Characteristics of Atmospheric Boundary Layer during Dust Events in Lanzhou,China and their Relation with PM10 Pollution
In order to understand the influence mechanism of dust events on PM10 pollution,the characteristics of atmospheric boundary-layer structure and turbulent flux transport during different kinds of dust events in Lanzhou and their relation with PM10 pollution were analyzed by using the data of PM10 concentration,gradient measurements of meteorological tower and turbulent flux measurements observed at SACOL.As dust events break out,the strong inversion in the boundary layer breaks and a mixing layer develops quickly.With the rise of wind speed,PM10 concentration increases sharply.If there is obvious dust transport from upstream regions,the peak of PM10 concentration can lag behind the peak of wind speed.The vertical transport of momentum flux is very strong.The turbulent momentum downward transport,especially the downward momentum flux of meridional velocity,is the main factor which causes the dust blowing and the heavy PM10 pollution during dust events.
dust events PM10 pollution atmospheric boundary-layer structure turbulent flux transport influence mechanism
Xinyuan Feng Shigong Wang
Plateau Atmosphere and Environment Key Laboratory of Sichuan Province,College of Atmospheric Science The Key Laboratory of the Education Ministry of Semi-Arid Climate Change,College of Atmospheric Scie
国际会议
哈尔滨
英文
372-377
2010-07-24（万方平台首次上网日期，不代表论文的发表时间）