大连市PM_(2.5)-O_(3)复合污染特征及潜在源区分析  

Composite Pollution Characteristics and Potential Source Area Analysis of PM_(2.5)-O_(3) in Dalian City

作　　者：丁成亮 郑洪波[1] DING Chengliang;ZHENG Hongbo(School of Environment Science and Technology,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学环境学院,辽宁大连116024

出　　处：《环境科学与技术》2024年第S01期95-101,共7页Environmental Science & Technology

基　　金：国家自然科学基金项目(42071273)。

摘　　要：为探究PM_(2.5)-O_(3)复合污染特征并分析潜在源区,文章基于大连市2019年高时间分辨率PM_(2.5)和O_(3-8 h)监测数据和气象数据,分析复合污染时气象特征,计算潜在源贡献因子确定潜在源区。结果表明:海平面压力为1008.6~1016 hPa、温度为14.5~21℃、相对湿度为48%~59%时更易发生PM_(2.5)-O_(3)复合污染;大连市西北和西南方向气流占比最大,西南方向在春、秋、冬3季携带的PM_(2.5)浓度最高,可达82.55μg/m^(3),且春季携带的O_(3)浓度最高,为109.83μg/m^(3),西北方向夏季气流携带的O_(3)浓度最高,为122.02μg/m^(3)。大连市PM_(2.5)和O_(3)污染受到山东省东北部、京津冀西南部和渤海海域等地区远距离输送的影响。研究结果表明,发生PM_(2.5)-O_(3)复合污染的气象条件更为严苛,大气污染区域联合防控时应重点关注山东省东北部、京津冀西南部等城市的外来输送影响。In order to explore the characteristics of PM_(2.5)-O_(3) composite pollution and analyze the potential source area,analyzing the meteorological characteristics of composite pollution and determines the potential source area by calculating the potential source contribution factor based on the high time resolution PM_(2.5) and O_(3)-8 h online monitoring data and meteorological factor data of Dalian in 2019.The results show that when the sea level pressure is 1008.6~1016 hPa,the temperature is 14.5~21℃,and the relative humidity is 48%~59%,the combined pollution of PM_(2.5)-O_(3) is more likely to occur.The air flow in the northwest and southwest directions has the largest proportion.The PM_(2.5) concentration in the southwest direction is the highest in spring,autumn and winter,up to 82.55μg/m3,and the O_(3) concentration in spring is the highest,is 109.83μg/m3,while the O_(3) concentration in the northwest direction is the highest in summer,is 122.02μg/m3.PM_(2.5) and O_(3) pollution in Dalian are affected by long-distance transport in the northeastern part of Shandong Province,the southwestern part of Beijing-Tianjin-Hebei,and the Bohai Sea.The results show that the meteorological conditions for the occurrence of PM_(2.5)-O_(3) combined pollution are more severe,and the influence of external transport in the northeastern part of Shandong Province and the southwestern part of Beijing-Tianjin-Hebei should be paid attention to in the joint prevention and control of air pollution.

关 键 词：PM_(2.5)-O_(3)复合污染 季节 气象条件 后向轨迹 

分 类 号：X51[环境科学与工程—环境工程]