苏州城市颗粒物与臭氧相互作用的数值模拟研究

Numerical simulation of the interaction between haze and ozone in the urban area of Suzhou urban

利用南京大学城市空气质量预报模式（NJU-CAQPS）研究苏州城市颗粒物和臭氧的相互作用,评估各效应对污染物的影响和冬夏两季相对重要性.研究表明冬季颗粒物的辐射效应造成模拟域向下短波辐射减小5.4%~22%,近地面气温降低0.25~0.48℃,湍能和风速减小,边界层高度降低,城区PM2.5、NO_2、NO和SO_2浓度分别增加1.01%、0.48%、1.58%和0.71%,O_3浓度降低0.99%;颗粒物的光化学效应造成PM2.5、硫酸盐、硝酸盐、O_3和NO浓度分别降低0.04%、0.07%、0.04%、4.33%和8.09%,NO_2浓度升高3.59%;颗粒物的非均相效应造成PM2.5、硫酸盐、硝酸盐和NO浓度分别升高4.72%、22.07%、6.93%和2.59%,O_3、NO_2和SO_2浓度分别降低5.05%、1.19%和11.38%.非均相效应对颗粒物、O_3和SO_2起主导作用;光化学效应对NO_2和NO起主导作用.夏季各效应引起污染物浓度变化趋势与冬季相近,但夏季辐射效应对除O_3外的NO_2、NO和SO_2影响程度加强,对颗粒物影响程度减弱;光化学效应对各污染物（除NO）的影响程度加强尤其对硝酸盐和硫酸盐;非均相效应对各污染物（除硝酸盐）的影响程度加强.

Nanjing University City Air Quality Prediction System（NJU-CAQPS）is used in this research to study the interactions between particulate matters and ozone and evaluate the relative importance of each effect of particulate matters in winter and summer in Suzhou city.In winter case radiative effect of particulate matters results in a decrease of downward shortwave radiation by 5.4%~22%,temperature close to the ground by 0.25~0.48 ℃, turbulent energy,wind speed and boundary layer height decrease,PM2.5 ,NO2 ,NO and SO2 increase by 1.01%, 0.48%,1.58% and 0.71% in the urban,O3 concentration decrease by 0.99%.Photochemical effect of particulate matter leads to an decrease of PM2.5 ,sulfate,nitrate,O3 and NO concentration by 0.04%,0.07%,0.04%,4.33%and 8.09%,an increase of NO2 by 3.59%.Heterogeneous effect of particles results in an increase of PM2.5 ,sulfate, nitrate and NO concentration by 4.72%,22.07%,6.93% and 22.07% respectively,a reduction of O3 ,NO2 and SO2 concentration by 5.05%,1.19% and 5.05% respectively.Heterogeneous effect plays a leading role in particulate matter,O3 and SO2 .Photochemical effect plays a leading role in NO2 and NO.The effects on each pollutant of each effect in Summer case is similar to winter one.But radiative effect has a strengthening influence on NO2 ,SO2 and NO （except for O3 ）and a shortening influence on particulate matters,photochemical effect has a strengthening impact on each pollutant（except for NO）especially on nitrate and sulfate,heterogeneous effect has an strengthening influence on each pollutants（with the exception of nitrate）.