南宁市大气气溶胶新粒子生成特征观测分析  

Observation and analysis of the formation characteristics of new aerosol particles in Nanning

作　　者：刘慧琳 陈志明 莫招育 穆奕君 黄炯丽 杨俊超 张达标 李宏姣 李昊 黄喜寿 王丹媛 LIU Huilin;CHEN Zhiming;MO Zhaoyu;MU Yijun;HUANG Jiongli;YANG Junchao;ZHANG Dabiao;LI Hongjiao;LI Hao;HUANG Xishou;WANG Danyuan(Scientific Research Academy of Guangxi Environmental Protection,Nanning Guangxi 530022;The Collaborative Innovation Center of the Ecological Environment&Integration Development in the Xijiang River Basin,Nanning Guangxi 530022)

机构地区：[1]广西壮族自治区环境保护科学研究院,广西南宁530022 [2]广西西江流域生态环境与一体化发展协同创新中心,广西南宁530022

出　　处：《环境污染与防治》2021年第6期747-752,共6页Environmental Pollution & Control

基　　金：广西壮族自治区自然科学基金资助项目(No.2019GXNSFBA185039、No.2019GXNSFAA185061);广西壮族自治区重点研发计划资助项目(桂科AB20238014);广西大气污染来源解析及预报预警工程技术研究中心项目。

摘　　要：2018年9月至2019年5月,利用颗粒物粒径分布测量仪对南宁市大气气溶胶新粒子生成事件进行长期观测。结果表明:(1)南宁市发生新粒子生成事件49 d,新粒子生成日颗粒物平均数浓度为98700个/cm^(3)。新粒子生成日主要集中在秋、春季,发生频率分别为39.9%和29.3%。(2)新粒子生成在10:00—19:00发生频率较高,12:00—13:00为峰值。新粒子生成粒径主要集中分布在3~25 nm,气溶胶粒径增长率为1.5~21.3 nm/h。(3)新粒子生成日PM_(2.5)和PM_(1)均值比非新粒子生成日低,说明空气清洁易发生新粒子生成。(4)新粒子生成日主要出现在高温、低湿、高辐射的天气。新粒子生成日气团主要来自海南东北部、湖北中部和湖南中部,其中来自海南东北部的气团较清洁,利于新粒子生成。Long-term monitoring of atmospheric new particle formation(NPF)was conducted from September 2018 to May 2019 in Nanning using a particle size spectrometer.The results showed that:(1)the new particle generation event occurred in Nanning for 49 days,and the average daily particle concentration was 98700 particles/cm^(3).NPF days in Nanning appeared mainly in autumn and spring,which the occurrence frequency was 39.9%and 29.3%respectively.(2)The frequency of NPF was high from 10:00 to 19:00,and the peak was from 12:00 to 13:00.The particle size of NPF was mainly distributed in 3-25 nm,and the growth rate of aerosol particles was in the range of 1.5-21.3 nm/h.(3)The average concentration of PM_(2.5) and PM_(1) on NPF days was lower than that on non-new particle formation(non-NPF)days,which indicated that NPF was prone to be occurred in a clean air environment.(4)NPF mainly appeared in high temperature,low humidity and high radiation weather conditions.The air mass generated by new particles mainly came from Northeastern Hainan,Central Hubei and Central Hunan,and the air mass from Northeastern Hainan was cleaner,which was conducive to the generation of new particles.

关 键 词：新粒子生成 特征 气象条件 南宁市 

分 类 号：X513[环境科学与工程—环境工程]