2018年长三角一次持续重污染过程分析  

Analysis of a Process of Continuous Heavy Pollution in Yangtze River Delta in 2018

作　　者：杨卫芬 何涛 叶香 YANG Wei-fen;HE Tao;YE Xiang(Jiangsu Changzhou Environmental Monitoring Center,Changzhou,Jiangsu 213001,China)

机构地区：[1]江苏省常州环境监测中心,江苏常州213001

出　　处：《环境监控与预警》2018年第5期12-17,共6页Environmental Monitoring and Forewarning

基　　金：江苏省环境监测科研基金资助项目(1603)

摘　　要：利用常州市6个环境空气质量评价点PM_(2.5)、PM_(10)、SO_2、NO_2、CO和水溶性离子数据,结合后向轨迹、激光雷达探空资料、气象资料等,分析了2018年1月29日—2月2日长三角区域一次持续重污染过程。结果表明,重度污染时次高达94 h,PM_(2.5)最高值达235μg/m^3,由外来输送污染物与本地排放的污染物叠加而成,在不利气象条件影响下,污染物在长三角区域长时间滞留;重污染期间,污染物日变化规律显示,PM2.5受外来源影响更显著,而SO_2、NO_2受本地污染源影响更显著,水溶性粒子组分与常州市本地源存在较大差异,其中NO_3^-、NH_4^+、K^+、Mg_(2+)和SO_4^(2-)值增加最为明显,较污染前分别增加了9.1,5.9,4.3,4.2和4.1倍; K+值升高较快,说明污染期间也受到了生物质燃烧的影响。此外,NO_3^-和SO_4^(2-)在空气质量较好时,在水溶性离子中的占比日变化幅度较大,而在重污染期间,NO_3^-和SO_4^(2-)日变化幅度明显减小。Based on the data of PM2.5, PM10, S02, NO2, CO and water soluble ions in Changzhou city, a more serious pollution process appeared in Yangtze River Delta region from January 29 to February 2 in 2018 was analyzed, combined with backwards trajectory analysis method, laser radar sounding data and meteorological data. The results indicated that the heavy pollution times 3 reached up to 94 hours, and the concentration of PM2.5 reached up to 235 μLg/m The results of both external pollutants and local pollutants lead to the pollution process, and pollutants stay for a long time under adverse weather condition. During heavy pollution, the diurnal variation of pollutants showed that PM2.5 was more significant affected by external pollutants, while SO2 and NO2 was more significant affected by local pollutants. It was also found that water soluble ions had much difference with local pollution of Changzhou. The concentration of NO3-,NH4＋,k＋,Mg2＋ and SO42- increased most obviously during heavy pollution period, jumped 9.1 times, 5.9 times, 4.3 times, 4.2 times and 4.1 times respectively compared to those before the pollution happened; the concentration of K ＋ increased quickly, indicating that air quality in Changzhou was also affected by biomass burning during the period of pollution. In addition, the daily variation range of the ratio of NO3 - and SO42- to water soluble ions was great when the air quality was better but significantly reduced while in pollution period.

关 键 词：长三角 重度污染 PM 2.5 PM10 S02 N02 CO 水溶性离子 

分 类 号：X820[环境科学与工程—环境工程]