摘要
分析了广东省2015—2021年的臭氧浓度特征,选取2018—2020年台风相对活跃的夏秋季(7—10月)作为研究时段,研究了广东省臭氧污染与台风之间的关系.结果表明,2015—2021年,广东省臭氧浓度经历了先升后降的变化过程,2019年,广东省臭氧第90百分位数浓度达到了有监测数据以来的最高值,但仍未超过国家二级标准限值.广东省在春季与秋季臭氧超标天数较多,且近年来冬春季臭氧超标情况在加剧,秋季臭氧超标情况有所好转.7—10月,广东省约81%的臭氧污染与周边台风活动有关,在受台风影响的污染天中,有约80%发生在台风距离广东2500 km范围内.深圳与汕尾臭氧污染与台风活动关系最密切,夏秋季,超过9成的污染天与台风活动相关;汕头、珠海、中山、茂名、阳江、江门等沿海城市夏秋季臭氧污染天中超过8成与台风活动相关.内陆城市臭氧污染与台风的关联性相对较小,梅州臭氧污染与台风活动关联最小.与在东南亚、我国海南或广东登陆的台风相比,北上的台风更容易导致广东地区出现臭氧污染.在台风外围下沉气流的影响下,珠三角中部等主要大气污染物排放区域及周边容易出现大范围晴热高温天气;水平风速低,水平扩散条件不利;下沉气流导致垂直扩散条件不利;风向的转换易造成珠三角中部的臭氧与其前体物向下风向城市输送,从而导致下风向城市也会在珠三角中部城市出现污染后发生较严重的臭氧污染.
This paper analyzed the characteristics of ozone concentration and studied the relationship between the occurrences of ozone pollution and typhoons in the summer and autumn(July to October)seasons from 2018 to 2020 with relatively active typhoons in Guangdong Province.The results showed that from 2015 to 2021,the ozone pollution in Guangdong Province experienced a changing process of first rising and then falling.In 2019,the concentration of the 90th percentile of ozone in Guangdong Province reached the highest value since monitoring data became available,yet it is still below the national secondary standard.In Guangdong Province,there were more days of ozone exceeding the standard level in spring and autumn.In recent years,the situation of ozone exceedance days in winter and spring was intensified,and the situation of ozone exceedance days in autumn was improved.From July to October,about 81%of the ozone pollution in Guangdong Province was related to the surrounding typhoon activities.About 80%of the pollution days affected by typhoons occurred within 2500 km of the typhoon from Guangdong.Ozone pollutions in Shenzhen and Shanwei were most closely related to typhoon activities.In summer and autumn,more than 90%of the polluted days in the two cities were related to typhoon activities.The correlations between ozone pollution and typhoon activities in summer and autumn in Shantou,Zhuhai,Zhongshan,Maoming,Yangjiang,Jiangmen and other coastal cities were all above 80%.There were relatively low correlations between ozone pollution and typhoons in inland cities,and the least correlation between ozone pollution and typhoon activities was in Meizhou.Compared with typhoons landing in Southeast Asia,Hainan or Guangdong,typhoons heading north were more likely to cause ozone pollution in Guangdong.Under the influence of the downdraft at the periphery of the typhoon,the central Pearl River Delta(PRD)and other major air pollutant emission areas and surrounding areas were prone to large areas of sunny,hot and high-temperature weather.Low horizontal wind speed made unfavorable horizontal dispersion conditions.Meanwhile,the downdraft air led to adverse vertical dispersion conditions.The change of wind direction would lead to the downwind transportation of ozone and its precursors from the central PRD,which caused more serious ozone pollution in downwind cities after the pollution in the central PRD cities.
作者
沈劲
李婷苑
廖彤
赵文龙
陈瑶瑶
陈多宏
钟庄敏
王伯光
杜晓光
SHEN Jin;LI Tingyuan;LIAO Tong;ZHAO Wenlong;CHEN Yaoyao;CHEN Duohong;ZHONG Zhuangmin;WANG Boguang;DU Xiaoguang(State Environmental Key Laboratory of Regional Air Quality Monitoring,Guangdong Environmental Protection Key Laboratory of Secondary Air Pollution Research,Guangdong Ecological Environmental Monitoring Center,Guangzhou 510308;Guangdong Ecological Meteorological Center(Pearl River Delta Center for Environmental Meteorology Prediction and Warning),Guangzhou 510640;Zhejiang Ecological and Environment Monitoring Center,Hangzhou 310007;Institute for Environmental and Climate Research,Jinan University,Guangzhou 511443;Northern Theater Air Force Staff,Shenyang 110000)
出处
《环境科学学报》
CAS
CSCD
北大核心
2023年第1期152-160,共9页
Acta Scientiae Circumstantiae
基金
广东省重点领域研发计划(No.2020B1111360003)
广东省科技计划项目(No.2019B020208006)
国家自然科学基金创新研究群体项目(No.42121004)
国家自然科学基金面上项目(No.42077190)。
关键词
广东
臭氧
夏秋季
台风
Guangdong
ozone
summer and autumn
typhoons
