摘要
于2019年1月27日—3月18日及2020年1月27日—3月18日对西安市细颗粒物(PM_(2.5))的碳组分浓度进行了在线观测,对比分析了非疫情与疫情期间各常规污染因子、气象要素、PM_(2.5)中有机碳(OC)和元素碳(EC)的污染特征。结果表明:非疫情与疫情期间西安市的气象条件总体水平较为相近。疫情期间的二氧化硫(SO_(2))、臭氧(O_(3))浓度相对升高。重污染天气下,除PM_(2.5)外,其他污染物浓度均降低,说明疫情管制对重污染天气污染物浓度的削弱作用明显。疫情期间,PM_(2.5)中的OC组分浓度及占比有显著升高,与疫情期间的各类交通管制导致的机动车尾气排放量显著降低有关。另外,OC与EC的相关性较强,说明污染来源与人类日常生活有关。疫情期间西安市颗粒物中碳组分主要来自各类生物质燃烧,并且存在SOC污染,SOC在OC中的占比达到37.8%。疫情期间重污染天气下,SOC在OC中的占比达到87.5%,说明SOC对重污染天气OC的贡献较大。
Carbon components in fine particulate matter(PM_(2.5))at Xi'an(Shaanxi Environmental Monitoring Center Station)was continuously measured from January 27 to March 18,2019 and from January 27 to March 18,2020.And pollution characteristics of conventional pollution factors,meteorological factors,organic carbon(OC)and elemental carbon(EC)in PM_(2.5)during non-epidemic and epidemic periods were compared and analyzed.The results showed that the overall level of meteorological conditions in Xi'an during non-epidemic and epidemic was similar.During the epidemic,concentrations of sulfur dioxide(SO_(2))and ozone(O_(3))were increased.And under the heavy pollution weather,concentration of other pollutants were all reduced except PM_(2.5).It illustrated that the epidemic control had a significant weakening effect on concentration of pollutants in heavily polluted weather.During the epidemic,concentration and proportion of organic carbon components in PM_(2.5)increased significantly,due to the exhaust emissions of motor vehicles caused by various traffic controls.In addition,correlation between OC and EC was relatively strong.It illustrated that sources of pollution came from human daily activities.Carbon components in the particulate matter in Xi'an during epidemic mainly came from various kinds of biomass burning,and there were SOC pollution.SOC accounted for 37.8%of OC.In heavily polluted weather,SOC accounted for 87.5%of OC during the epidemic,indicating that SOC had a greater contribution to OC in heavily polluted weather.
作者
张淳
高飞
高艳芬
吕婧
李毅辉
赵荣娜
张慧芳
王彩虹
ZHANG Chun;GAO Fei;GAO Yanfen;LYU Jing;LI Yihui;ZHAO Rongna;ZHANG Huifang;WANG Caihong(Shaanxi Environmental Monitoring Center Station,Xi'an 710054,China;Ecological Environment Monitoring Center of Tibet Autonomous Region,Lhasa 850000,China)
出处
《中国环境监测》
CAS
CSCD
北大核心
2023年第3期67-77,共11页
Environmental Monitoring in China
基金
陕西省自然科学基础研究计划项目(2021JQ-963)。
关键词
西安
细颗粒物
新冠疫情
有机碳
元素碳
Xi'an
fine particles
COVID-19
organic carbon
elemental carbon
