摘要
利用吸湿增长光散射测量系统、黑碳仪和气相色谱质谱联用仪等仪器,于2019年7月15日8月4日在北京地区开展了为期21d的大气气溶胶观测实验.观测期间北京市区于7月27日出现短暂的轻度污染,并在7月29日出现强降水天气.结果显示:北京市区夏季大气污染变化剧烈且短暂,大气气溶胶散射吸湿增长因子f(RH)呈现平滑连续的特点,并且降水会对f(RH)造成显著影响.7月27日PM2.5的平均质量浓度为(92.54±47.05)μg/m3,表现出较为剧烈的污染变化.7月2830日平均散射吸湿增长因子f(80%±1%)分别为(1.50±0.35),(1.43±0.36)和(1.48±0.25),反映了降水对于大气气溶胶的湿清除作用.最后利用实验数据估算粒径吸湿增长因子gf(RH),并建模研究f(RH)和gf(RH)的关系,模型精度R2最高可达0.698.
With Aerosol Conditioning System(ACS1000),aethalometer(AE33)and gas chromatography/mass selective detector(GC/MSD),an experimental study on the atmospheric aerosol in Beijing was conducted from July 15 to August 4,2019.There was a short-term air pollution process on July 27 and a strong precipitation on July 29 during the observation.This pollution process in Beijing was short and the concentrations of the pollutants changed dramatically.A continuously increasing tread of f(RH)was observed in the experiment,and the measurements indicated that the precipitation had a great impact on the f(RH).The average concentration of PM2.5 on July 27 was(92.54±47.05)μg/m³with a dramatic variation.The average scattering enhancement factors for f(80%±1%)from July 28 to July 30 were(1.50±0.35),(1.43±0.36)and(1.48±0.25),respectively.Furthermore,the experimental data were used to develop a quantitative model between f(RH)and gf(RH)for estimating the hygroscopic growth factor gf(RH).The result of the f(RH)-gf(RH)relationship model showed a good performance,and its R2 could reach to 0.698.
作者
张泽宇
王甜甜
范萌
陈良富
余超
纪轩禹
陶金花
ZHANGZe-yu;WANG Tian-tian;FAN Meng;CHEN Liang-fu;YU Chao;JI Xuan-yu;TAO Jin-hua(State Key Laboratory of Remote Sensing Science,Aerospace Information Research Institute,China Academy of Sciences,Beijing 100101,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Jiangsu Provincial Environmental Monitoring Center,Nanjing 210019,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2020年第6期2353-2360,共8页
China Environmental Science
基金
国家重点研发计划项目(2017YFB0503901)
国家自然科学基金资助面上项目(41501373,41871254,41830109,91644216)
国家自然科学基金资助重点项目(41830109,91644216)。
关键词
大气气溶胶
吸湿增长
化学组分
aerosol
hygroscopic growth
chemical composition
作者简介
责任作者:陶金花,副研究员,taojh@radi.ac.cn;张泽宇(1996-),男,江西景德镇人,中国科学院大学硕士研究生,主要研究方向为大气气溶胶.
