ANALYSIS ON ATMOSPHERIC BOUNDARY LAYER STRUCTURE AND ITS EFFECT ON POLLUTION CONCENTRATION OVER DONGSHAN, SUZHOU IN WINTER
WANG Cheng-gang
LI Ying
CAO Le
YAN Jia-de
AN Jun-lin
Abstract：During January 15-27,2015,a sounding experiment in atmospheric boundary layer over Dongshan,Suzhou was performed.Structural characteristics of atmospheric boundary layer conditions and the impacts brought by boundary layer structure on the vertical distribution of pollutants in Dongshan were studied.The results show that the evolution of boundary layer structure over Dongshan in the process of air pollution is typical.Stable boundary layer height was 200 meters at night,and the maximum boundary layer height during the day was 1 000 meters.Pollutant concentration in the boundary layer was easily affected by its height,and low boundary layer height made fine particulates accumulate in the surface layer;on the contrary,when the boundary layer height was high,turbulence developed vigorously,and fine particulates were distributed evenly in the vertical direction.In addition,due to the stable boundary layer with inversion structure at night,pollutants were prone to gather near the ground.The vertical structure of the wind distribution also had a significant effect on the spatial distribution of fine particulates.The distribution of fine particles is more in the low-velocity layer with smaller wind speed but less in the middle and high layers with larger wind speed.
Keywords：boundary layer structurefine particulatevertical structureinversionwind speed
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 912-921 )