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COVID-19管控期间海口市PM_(2.5)和O_(3)污染特征 被引量:2

Characteristics of PM_(2.5)and O_(3)during COVID-19 lockdown in Haikou City
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摘要 以海口市为研究区域,收集了新冠疫情期间(2020年1—4月)环境空气中6项常规污染物、PM_(2.5)水溶性离子和VOCs在线观测数据,结合同期气象参数,分析了特殊排放情境下低浓度地区PM_(2.5)组分、臭氧及其前体物的变化特征.结果表明:(1)2020年疫情期间,海口市空气质量改善情况较好,6项污染物浓度均不同程度地降低,改善率介于9.5%~27.6%之间;(2)海口市PM_(2.5)水溶性离子中,硝酸根离子和铵根离子的下降幅度最大,分别下降了38.9%和34.8%,其余离子小幅降低;(3)疫情期间,工业企业生产和交通活动的降低明显有助于乙烷、丙烷、正丁烷和异丁烷的体积分数及贡献率的降低,而对芳香烃的降低效果不如内地明显;(4)虽然管控减排对体积分数较大的低碳烷烃改善较明显,但体积分数较小的烯烃尤其是乙烯的臭氧生成潜势(Ozone formation potentials,OFP)贡献率反而出现上升,是未来研究区域内控制臭氧的关键;(5)管控期间O_(3)浓度日变化明显减弱,与NO_(2)和主要VOCs物种浓度大幅下降有关. In this study,taking Haikou City as the study area,the on-line observation data of six conventional pollutants in ambient air,water-soluble ions in PM_(2.5)and VOCs during the COVID-19 epidemic period(January-April 2020)were collected.Combination with meteorological parameters in the same period,the characteristics of PM_(2.5)components and ozone precursors in low concentration areas under special emission scenarios were analyzed.The results showed that:①During the COVID-19 epidemic period in 2020,the air quality in Haikou City was improved well,and the concentrations of the ambient pollutants with the improvement rate ranging from 9.5%to 27.6%.②Among the water-soluble ions of PM_(2.5)in Haikou city,the nitrate ions and ammonium ions decreased the most,by 38.9%and 34.8%respectively,and the remaining ions decreased slightly.③The reduction of production and traffic activities of industrial enterprise obviously contributed to the reduction in the volume fractions and contribution ratios of ethane,propane,nbutane,and i-butane,but the effect on aromatic hydrocarbons was not as obvious as that in the mainland.④Although the control and reduction of emissions can obviously improve significantly on light alkanes with large volume fractions,the contribution rate of ozone formation potentials(OFP)of alkene with smaller volume fractions,especially ethylene,has increased,which is the key to control ozone in the future research area;⑤During the control period,The diurnal variation of O_(3)concentration was significantly weakened,which was related to the significant decrease in the concentration of NO_(2) and main VOCs species.
作者 胡珊瑚 邢巧 吴晓晨 曹小聪 谢文晶 谢荣富 徐文帅 HU Shanhu;XING Qiao;WU Xiaochen;CAO Xiaocong;XIE Wenjing;XIE Rongfu;XU Wenshuai(Hainan Research Academy of Environmental Sciences,Haikou 571126)
出处 《环境科学学报》 CAS CSCD 北大核心 2023年第4期70-78,共9页 Acta Scientiae Circumstantiae
基金 海南省重大科技计划项目(No.ZDKJ202007) 海南省财政专项项目(No.ZC2018-196)。
关键词 新型冠状病毒肺炎 PM_(2.5) O_(3) 水溶性离子 挥发性有机物(VOCs) 变化特征 气象条件 海口市 COVID-19 PM_(2.5) O_(3) water soluble ion volatile organic compounds(VOCs) characteristics of change meteorological conditions Haikou City
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