2017年广东省台风期间O3污染过程特征及影响因素分析  

Characteristics and impact factors of ozone pollution episode in Guangdong Province during typhoon period in 2017

作　　者：叶斯琪[1] 张月佳 陈多宏[1] 谢敏[1] 沈劲[1] 汪宇[1] 邓滢 蔡日东 YE Siqi;ZHANG Yuejia;CHEN Duohong;XIE Min;SHEN Jin;WANG Yu;DENG Ying;CAI Ridong(State Environmental Protection Key Laboratory of Regional Air Quality Monitoring,Guangdong Environmental Protection Key Laboratory of Secondary Air Pollution Research,Guangdong Environmental Monitoring Center,Guangzhou Guangdong 510308;Guangdong Suncere Technology Co.,Ltd.,Guangzhou Guangdong 510275)

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]广东旭诚科技有限公司,广东广州510275

出　　处：《环境污染与防治》2019年第11期1325-1328,1334,共5页Environmental Pollution & Control

基　　金：国家重点研发计划项目(No.2017YFC0212806、No.2018YFC0213903);广东省科技发展专项基金资助项目(No.2017B020216007)

摘　　要：2017年7月25日至8月2日台风“纳沙”和“海棠”影响期间,广东省出现大范围O3污染过程,分析了其变化特征和影响因素。结果表明,台风登陆前城市O3污染逐渐加重,而台风登陆后O3污染逐渐缓解,污染较重城市集中分布在广东省中部,主要是广州市、佛山市、江门市、东莞市、中山市、汕尾市和清远市。造成台风期间O3污染的主要原因是:(1)双台风影响期间,广东省总体受海平面高压控制,以高温晴热天气为主,太阳辐射强、气温高、降水少,相对湿度较低,有利于本地光化学反应进行;(2)受台风外围下沉气流影响,垂直方向扩散条件不利,而平流层O3有可能向下运输;(3)台风登陆阶段,近地面风向以偏北风为主导,且风速小,导致O3浓度出现明显的上升。Variation characteristics and impact factors of a large-scale O3 pollution episode in Guangdong Province during typhoon“Nasha”and“Haitang”from July 25 th to August 2 nd in 2017 were analyzed.Results showed that before the typhoons landed,O3 pollution got worse persistently,but turned better after the typhoons landed.The pollution in central of Guangdong Province was more heavy,especially in Guangzhou City,Foshan City,Jiangmen City,Dongguan City,Zhongshan City,Shanwei City and Qingyuan City.Main reasons contributed to the above pollution episode included the following aspects:(1)during the two typhoons,Guangdong Province was dominantly contolled by high pressure,sunny and hot weather with strong solar radiation,high temperature,little precipitation and low relative humidity,which were favorable to enhance local photochemical reactions.(2)Affected by the the surrounding downward drafts of typhoons,the vertical diffusion was weakened but brought O3 from stratosphere.(3)During the pollution episode,the surface wind speed were low,mainly from north direction,resulting in O3 raising.

关 键 词：O3 天气形势 气象因素 台风 

分 类 号：P44[天文地球—大气科学及气象学]