南京春夏季大气PM_(2.5)中含碳气溶胶污染特征  

Study on the pollution characteristics of carbon-containing aerosols in atmospheric PM_(2.5) in Nanjing in spring and summer

作　　者：裴宇儇 王红磊[1] 张连霞 施双双[1] 可玥 刘思晗 刘安康 程龙 PEI Yuxuan;WANG Honglei;ZHANG Lianxia;SHI Shuangshuang;KE Yue;LIU Sihan;LIU Ankang;CHENG Long(Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration,Nanjing University of Information Science and Technology,Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing,210044,China;Ordos Meteorological Bureau of Inner Mongolia,Ordos,017010,China;Beijing Saak-Mar Environmental Instrument Ltd.,Beijing,100094,China)

机构地区：[1]南京信息工程大学中国气象局气溶胶-云-降水重点开放实验室,南京信息工程大学气象灾害预报预警与评估协同创新中心,南京210044 [2]鄂尔多斯市气象局,鄂尔多斯017010 [3]北京赛克玛环保仪器有限公司,北京100094

出　　处：《环境化学》2022年第10期3310-3322,共13页Environmental Chemistry

基　　金：江苏省自然科学基金(BK20180801);国家自然科学基金(41805096)资助.

摘　　要：使用TCA08型总碳分析仪观测了南京市2019年4月19日—6月27日大气气溶胶中有机碳(OC)与元素碳(EC)的含量,结合空气质量数据(PM_(2.5)、PM_(10)、SO_(2)、NO_(2)、CO和O_(3))和气象数据,分析了春夏季含碳气溶胶的污染特征及其影响因素.结果表明,观测期间南京市不同污染物和含碳气溶胶质量浓度春夏季节性差异明显.O_(3)、CO、EC和POC在夏季平均质量浓度分别为109.5、0.74、3.1、2.1μg·m^(−3),分别比春季高了32.1%、4.8%、38.0%和30.0%;而SO_(2)、NO_(2)、PM_(2.5)、PM_(10)、OC和SOC的质量浓度在春季的平均质量浓度分别为12.0、37.2、31.4、65.4、6.2、4.6μg·m^(-3),分别比夏季高了23.3%、24.7%、7.1%、22.8%、26.5%和56.5%.不同空气质量等级下不同碳气溶胶的日变化特征不同.OC和SOC日变化在空气质量为优时日变化平缓,空气质量为良时均为单峰型分布,在轻度污染时均为三峰型分布.EC和POC在空气质量为优时日变化均为双峰型分布,在良和轻度污染下日变化均为单峰型分布.3次污染过程中O_(3)与SOC的相关性不同,相关系数分别为﹣0.64、﹣0.66和0.63.3次O_(3)污染过程中含碳气溶胶日变化特征不同.OC和SOC在过程一和过程二中日变化均表现出夜间高白天低的特征;而过程三中昼夜浓度差异不显著.过程一和过程二中EC和POC均呈单峰型分布,峰值均出现在4:00—6:00,但过程三中却均呈显著的双峰型分布,峰值均分别出现在5:00—7:00和21:00—24:00.The TCA08 total carbon analyzer was used to observe the content of organic carbon(OC)and elemental carbon(EC)in atmospheric aerosols in Nanjing from April 19 to June 27,2019,combined with air quality data(PM_(2.5),PM_(10),SO_(2),NO_(2),CO and O_(3))and meteorological data,and analyzed the pollution characteristics and influencing factors of carbon-containing aerosols in spring and summer.The results show that the different pollutants and carbon aerosol mass concentrations in Nanjing during the observation period have obvious seasonal differences in spring and summer.The average mass concentrations of O_(3),CO,EC and POC in summer are 109.5,0.74,3.1,2.1μg·m^(−3),respectively,which are 32.1%,4.8%,38.0%and 30.0%higher in summer than in spring;while the average mass concentrations of SO_(2),NO_(2),PM_(2.5),PM_(10),OC and SOC in spring are 12.0,37.2,31.4,65.4,6.2,4.6μg·m^(-3) are respectively 23.3%,24.7%,7.1%,22.8%,26.5%and 56.5%higher than summer.The diurnal variations characteristics of different carbon aerosols under different air quality levels are different.The diurnal changes of OC and SOC change smoothly when the air quality is excellent.When the air quality is good,they all have a unimodal distribution,and when the air quality is light pollution,they all have a trimodal distribution.The daily changes of EC and POC are both bimodal distributions when the air quality is excellent,and the daily changes are all unimodal distributions when the air quality is good and light pollution.The correlation between O_(3)and SOC during the three pollution processes was different,and the correlation coefficients were-0.64,-0.66 and 0.63,respectively.The daily variation characteristics of carbon-containing aerosols during the three O_(3)pollution processes were different.The diurnal changes of OC and SOC in process one and process two showed the characteristics of high at night and low during the day;while the difference in concentration between day and night in process three was not significant.Both EC and POC in proces

关 键 词：南京 有机碳 元素碳 臭氧 质量浓度日变化 

分 类 号：X513[环境科学与工程—环境工程]