珠三角北部背景站臭氧浓度变化特征  

Characteristics of Ozone Concentration Variation in the Northern Background Site of the Pearl River Delta

作　　者：沈劲[1] 何灵 程鹏 谢敏[1] 江明[1] 陈多宏[1] 周国强[1] SHEN Jin;HE Ling;CHENG Peng;XIE Min;JIANG Min;CHEN Duohong;ZHOU Guoqiang(State Environmental Key Laboratory of Regional Air Quality Monitoring/Guangdong Environmental Protection Key Laboratory of Secondary Air Pollution Research/Guangdong Environmental Monitoring Center,Guangzhou 510308,China;Qingyuan Environmental Monitoring Station,Qingyuan 510308,China;Jinan University Institute of Mass Spectrometer and Atmospheric Environment,Guangzhou 510632,China;Guangdong Provincial Engineering Research Center for On-line Source Apportionment System of Air Pollution,Guangzhou 510632,China)

机构地区：[1]广东省环境监测中心/国家环境保护区域空气质量监测重点实验室/广东省环境保护大气二次污染研究重点实验室,广东广州510308 [2]清远市环境监测站,广东清远511500 [3]暨南大学质谱仪器与大气环境研究所,广东广州510632 [4]广东省大气污染在线源解析系统工程技术研究中心,广东广州510632

出　　处：《生态环境学报》2019年第10期2006-2011,共6页Ecology and Environmental Sciences

基　　金：国家重点研发计划项目（2018YFC0213904;2017YFC0212806;2018YFC0213903）;广东省科技发展专项基金项目（2018A050501009;2017B020216007）;国家自然科学基金项目(41801326;91544215)

摘　　要：O3已取代PM2.5成为珠三角空气污染的首要污染物,深入研究珠三角背景地区O3浓度变化特征对全面掌握珠三角空气质量概况具有非常重要的意义。以珠三角北部郊区背景监测点位广州市从化区天湖站点2006-2018年的监测数据为基础,结合空气质量模型与过程分析等工具,对珠三角背景地区的O3浓度进行分析。结果表明,2006年以来,珠三角背景地区的O3年平均质量浓度均在80μg·m^-3左右波动,年均值在2014年达到自动监测以来的历史峰值91μg·m^-3,2014年以来有逐年下降的趋势。2006-2018年O3小时质量浓度的频数分布表明30-100μg·m^-3是主要的小时质量浓度水平,占比约为59%,100μg·m^-3以下质量浓度的占比约为70%,160μg·m^-3以下质量浓度的占比约为94%,天湖站小时质量浓度超标(大于200μg·m^-3)概率为1.8%。平均而言,天湖站6-7月的O3质量浓度最低,分别为71μg·m^-3与73μg·m^-3。冷暖交替的月份质量浓度相对较高,10月与4月分别达到102μg·m^-3与84μg·m^-3,过程分析结果显示,在下沉气流等影响下,近地面层上层边界O3垂直输送是4月与10月高质量浓度O3的主要来源。天湖站的日均与月均O3质量浓度与日照时数均存在正相关关系,O3昼高夜低且与NO2呈反相关关系,O3质量浓度远高于NO2,说明天湖受人为源排放影响少。天湖站化学过程对O3的影响因季节而异,夏季光化学过程对O3的影响明显,白天平均O3净化学生成速率为18.5μg·m^-3·h-1;其他季节珠三角背景地区的O3质量浓度主要受物理过程影响。O3 has replaced PM2.5 as the primary pollutant of air pollution in Pearl River Delta(PRD). A thorough study of the background O3 concentration characteristics is of great significance for a comprehensive understanding of the general situation of air quality in PRD. Based on monitoring data from the Tianhu station in Conghua District of Guangzhou from 2006 to 2018, the background monitoring site in the northern suburbs of PRD, this study analyzed ozone concentration in the background area of the PRD with the help of air quality model and process analysis tools. The results showed that since 2006, the average annual ozone concentration in Tianhu fluctuated around 80 μg·m^-3. The annual average concentration reached the historical peak of 91 μg·m^-3 in 2014, and had been decreasing year by year since 2014. Frequency distribution of ozone hourly concentration in 2006-2018 showed that 30-100 μg·m^-3 was the main hourly O3 concentration level, accounting for about 59%. The proportion of the concentration below 100 μg·m^-3 was about 70%, the concentration below 160 μg·m^-3 was about 94%, and the probability of the hourly concentration exceeding the standard(more than 200 μg·m^-3) at Tianhu site was 1.8%. On average, the ozone concentration in Tianhu was the lowest in June and July, 71 μg·m^-3 and 73 μg·m^-3, respectively. Concentrations in cold and warm alternating months were relatively high, reaching 102 μg·m^-3 and 84 μg·m^-3 in October and April, respectively. The process analysis results showed that vertical transport of O3 near the upper boundary of the surface layer was the main source of high concentration in April and October under the influence of subsidence airflow. There was a positive correlation between daily and monthly average ozone concentration and sunshine hours. The ozone concentration was higher during day and lower at night and had inverse correlation with NO2. O3 concentration at Tianhu site was much higher than that of NO2, indicating that Tianhu was less affected by anthropog

关 键 词：珠三角 郊区 臭氧 过程分析 

分 类 号：X51[环境科学与工程—环境工程] X16