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《Environmental Science & Technology》 2017-02
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Analysis of the Characteristics of Ozone Concentration in Urban Area of Changsha

JIA Haiying;LI Mao;CHENG Bingfen;WANG Jikang;ZHANG Yongfeng;CHENG Nianliang;Hunan Meteorological Service Center;Chinese Research Academy of Environmental Science;National Meteorological Center;  
The spatial-temporal distribution characteristics of O_3 and the correlations between O_3 and ozone precursors,meteorological elements in Changsha urban area were investigated based on the hourly O_3 monitoring data from April,2014 to March 2015.The annual concentration of O_3 in Changsha was about 44.47 μg/m~3 and high O_3 concentration mainly concentrated in May and September and seasonal variations concentrations of PM_(2.5) were as winter spring autumn summer.The diurnal distribution of ozone presented a clear unimodal pattern with its peak appearing at 15 DO or 16 DO.The diurnal cycle of ozone can be divided into four stages:ozone accumulation stage and ozone abatement stage,photochemical generation stage and ozone consumption stage.For the spatial distribution of O_3,the concentration was lower in central urban area with the highest concentration appeared at background station.The diurnal patterns of the precursors such as CO,NO_2 of O_3 presented an obvious bimodal distribution,that were well negatively correlated to O_3 diurnal patterns.The concentration of O_3 was negatively correlated with the air pressure,humidity while it was positively correlated with temperature.
【Fund】: 长沙市科技计划项目(Z131100006113009);; 长沙市空气质量达标规划项目(Z131100005613046);; 环保公益性行业科研专项经费项目(201309071);; 北京市优秀人才培养资助
【CateGory Index】: X515
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