摘要
O3在空气质量的首要污染物占比中越来越高,已经逐渐取代PM2.5成为三亚市主要的空气污染物。深入研究O3浓度变化特征对全面掌控三亚市空气质量状况具有非常重要的意义。文章对2014-2019年三亚市O3、NO2浓度以及气象资料进行深入分析,探讨不同时间尺度O3浓度变化规律及其污染特征,并对2019年11月4-5日O3浓度超标事件进行了研究。结果表明,三亚市O3最大8 h浓度(O3-8 h)出现明显的上升趋势,气候趋势系数为0.347,2019年相对于2014年O3-8 h浓度上升幅度达到了5.85%。2017年三亚市O3浓度在全省18个市县中(三沙市除外)排名第12名,2018年和2019年均为第11名。秋、冬季O3-8 h浓度偏高,春、夏季偏低,O3质量浓度超标主要出现在10月和11月。O3浓度日变化呈单峰型,最大值出现在午后15:00附近。近6年O3浓度超标天数并没有出现显著的上升,而年平均O3-8 h浓度上升可能与一级污染天数下降,二级污染天数增多有关。对2019年11月4-5日三亚市一次O3浓度超标事件的分析表明,稳定的东北风风场、高温低湿的气象条件是造成此次过程的主要原因。11月4日白天O3浓度出现了两个峰值,其中第二个峰值出现的时间偏晚(17:00),表明此次过程中存在明显的O3输送特征。
O3 accounts for an increasing proportion of the primary pollutant in air quality,and has replaced PM2.5 as the primary pollutant of air pollution in Sanya City gradually.A thorough study of the temporal variation characteristics of O3 concentration is of great significance for a comprehensive understanding of the general situation of air quality in Sanya City.The temporal variation characteristics of O3 concentration and its relationship with NO2 and meteorological factors were analyzed by continuous observation from 2014 to 2019 in Sanya City,also a process with high O3 concentration from November 4 to 5,2019 was analyzed.The results showed that the maximum 8 h O3 concentration(O3-8 h)showed an obvious upward trend from 2014 to 2019,with a climate trend coefficient of 0.347.Compared with 2014,the increase of O3-8 h concentration reached 5.85%in 2019.Otherwise,O3 concentration ranked 12th among 18 cities and counties(without Sansha City)in 2017,and 11th in 2018 and 2019.O3-8 h was higher in autumn and winter,and lower in spring and summer.Excessive O3 mass concentration mainly occurred in October and November.The daily change of O3 showed a single peak,and the maximum value appeared around 15:00 in the afternoon.In the past 6 years,the number of days in O3 concentration exceeded the standard had not risen significantly in Sanya City,and the annual increase of O3-8 h might be attributed to the decrease of first-level days decrease,second-level days increase.A high ozone concentration process occurred in Sanya City on November 4‒5,2019,stable northeast wind field,high temperature and low humidity metrological conditions leaded to this process.There were two peaks in the O3 concentration during the day of November 4th,the second peak appeared late(17:00),which could be reflected significant O3 transmission characteristic.
作者
符传博
丹利
徐文帅
刘丽君
FU Chuanbo;DAN Li;XU Wenshuai;LIU Lijun(Hainan Institute of Meteorological Science,Haikou 570203,China;Key Laboratory of Regional Climate-Environment Research for Temperate East Asia/Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;Key Laboratory of South China Sea Meteorological Disaster Prevention and Mitigation of Hainan Province,Haikou 570203,China;Hainan Environmental Monitoring Centre,Haikou 571126,China)
出处
《生态环境学报》
CSCD
北大核心
2020年第10期2028-2033,共6页
Ecology and Environmental Sciences
基金
国家自然科学基金项目(4265010
41775011)
海南省自然科学基金项目(419MS108)
海南省气象局科研项目(HNQXXT202002)。
关键词
臭氧
前体物
气象因子
三亚市
Ozone
precursor
meteorological factor
Sanya City
