京津冀地区气溶胶直接辐射效应及其对地面臭氧浓度影响  

Aerosol direct radiation effect and its effect on ozone in Beijing-Tianjin-Hebei region

作　　者：蔡子颖 郝囝[3] 韩素芹 吕妍 姚青 杨旭 邱晓滨[3] 唐颖潇 CAI Ziying;HAO Jian;HAN Suqin;LÜYan;YAO Qing;YANG Xu;QIU Xiaobin;TANG Yinxiao(Tianjin Environmental Meteorological Center,Tianjin 300074;CMA-NKU Cooperative Laboratory for Atmospheric Environment-Health Research,Tianjin 300074;Tianjin Institute of Meteorology,Tianjin 300074;Tianjin Nankai Ecological Environment Monitoring Center,Tianjin 300112)

机构地区：[1]天津市环境气象中心,天津300074 [2]中国气象局-南开大学大气环境与健康研究联合实验室,天津300074 [3]天津市气象科学研究所,天津300074 [4]天津市南开区生态环境监测中心,天津300112

出　　处：《环境科学学报》2023年第6期39-47,共9页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金重点项目(No.42130513)。

摘　　要：气溶胶通过直接辐射效应、间接辐射效应和非均相反应过程影响近地面臭氧浓度,本文基于大气化学模式WRF/Chem,分别模拟2015年和2021年有无考虑气溶胶直接辐射效应时的京津冀地区气象和臭氧浓度变化,以期通过模式敏感性试验厘清该区域气溶胶直接辐射效应及其对臭氧影响,为“十四五”细颗粒物和臭氧协同控制提供理论支撑.研究表明:2021年京津冀地区气溶胶直接辐射效应导致该地区到达地面太阳辐射降低了7.58 W·m^(-2)(7.6%),气温下降了0.15℃,混合层厚度下降了3.2%,相对湿度增加了0.9%,气象条件整体趋向于不利于臭氧生成,降低区域臭氧浓度0.81%(0.77μg·m^(-3)),但与2015年相比,由于PM_(2.5)浓度大幅度降低,气溶胶直接辐射效应明显减弱,该减弱使得区域臭氧平均浓度增加了0.8%(0.7~0.8μg·m^(-3)),臭氧超标天数增加了3%(1 d),该作用与实际臭氧浓度增幅相比仅为其1/15.此外,气溶胶直接辐射效应对臭氧浓度的影响有明显的季节差异,冬、春、秋季臭氧浓度下降更为明显,夏季多因素综合平衡,臭氧浓度变化较小,近年来细颗粒物浓度下降,仅考虑气溶胶直接辐射效应,增加的主要是春季和秋季的臭氧,幅度分别达到1.28%和3.2%,浓度分别增加1.01μg·m^(-3)和2.15μg·m^(-3).Aerosol affects ozone concentration through direct radiation effect,indirect radiation effect and heterogeneous reaction process.Based on the atmospheric chemical model WRF/Chem,this paper simulated the changes of meteorological and ozone concentration in Beijing-Tianjin-Hebei region with or without aerosol radiation effect in 2015 and 2021,in order to clarify the aerosol direct radiation effect and its effect on ozone through model sensitivity test.The research showed that the direct radiation effect of aerosol in Beijing-Tianjin-Hebei region in 2021 leaded to the decrease of solar radiation reaching the surface by 7.6%(7.58 W·m^(-2)),the temperature by 0.15℃,the thickness of the mixed layer by 3.2%,and the relative humidity by 0.9%.The meteorological conditions tended to be unfavorable to ozone formation,reducing the regional ozone concentration by 0.81%(0.77μg·m^(-3)),but compared with 2015,the quality of PM_(2.5)was greatly reduced.The aerosol direct radiation effect was significantly weakened,which increased the average regional ozone concentration by 0.8%and the number of days exceeding the standard by 3%.In addition,there were obvious seasonal differences in the effect of aerosol direct radiation on ozone concentration.The decreased of ozone concentration was more obvious in winter,spring and autumn,and there was a comprehensive balance of multiple factors in summer.The concentration of fine particles had decreased in recent years.Only considering the aerosol direct radiation effect,the ozone in spring and autumn increased by 1.28%(1.01μg·m^(-3))and 3.2%(2.15μg·m^(-3)),respectively.

关 键 词：气溶胶辐射效应 大气化学模式 臭氧 京津冀 

分 类 号：X513[环境科学与工程—环境工程]