摘要
为探究“2211”号台风“轩岚诺”对绍兴市臭氧(O_(3))浓度的影响,选取了“轩岚诺”影响前后2022年9月1—8日绍兴市逐时空气质量监测数据、气象要素数据和ERA5再分析资料,采用后向轨迹模拟方法进行深入讨论.结果表明:“轩岚诺”影响前后绍兴市均出现了O_(3)污染过程,并且与人为影响较弱的2016年G20峰会同期空气质量数据相比,“轩岚诺”影响前后O_(3)污染的频率和强度均增强.绍兴9月1日为轻度污染,首要污染物为O_(3),且各区县变化基本一致;“轩岚诺”影响期间各区县空气质量均为优;“轩岚诺”影响过后,9月6—8日绍兴再度出现以O_(3)为首要污染物的轻度-中度空气污染.“轩岚诺”影响前的O_(3)污染过程,我国东南沿海省份为此次污染的主要贡献区域,华东地区处于“西高东低”的环流形势下,气象条件利于大气光化学反应,利于O_(3)浓度上升,并且在台风外围下沉气流作用下O_(3)于低层集聚并输送至绍兴,并于绍兴南侧地形抬升堆积,造成此次污染过程.“轩岚诺”影响后的O_(3)污染过程,我国东南沿海省份及华北地区为此次污染的主要贡献区域,华东地区在大陆高压控制下,中、低层源区存在垂直混合作用,气象条件利于大气光化学反应,后期由于冷空气南下沉积,并且低层东北气流将上游的污染物及前体物输送至绍兴,加剧了此次污染过程.
By analyzing the hourly air quality monitoring data,meteorological data,and ERA5 reanalysis data from September 1st to 8th,2022,the influence of 2211 Typhoon Hinnamnor on ozone(O_(3))concentration in Shaoxing was explored in this study.The results show that Shaoxing suffered from O_(3) pollution both before and after Typhoon Hinnamnor.The frequency and intensity of O_(3) pollution increased significantly compared with those during the same period of the G20 Summit in 2016.Light pollution of O_(3) existed on September 1st,and the variations of O_(3) were similar over most parts of Shaoxing.During the period directly affected by Typhoon Hinnamnor,the air quality turned to an excellent level.While from September 6th to 8th as the typhoon moved away,it was once again light-to-middle-level pollution with O_(3) as the primary pollutant in Shaoxing.The coastal provinces of southeastern China were the main potential source regions for the pollution before the Typhoon Hinnamnor.With the high pressure in the west and low pressure in the east over eastern China,the conditions of high temperature and low humidity are favorable for O_(3) formation due to active photochemical reactions.Affected by the strong downward motions outside the circulation of Typhoon Hinnamnor,pollutants were accumulated and transported to Shaoxing afterward.After the Typhoon Hinnamnor process,both of the coastal provinces of southeastern China and the northern China were the main potential source regions contributing to the local air pollution.Under the control of high pressure over eastern China,the meteorological conditions were conducive to the O_(3) formation.The low-level northeast airflow transported the pollutants and precursors southward,further deteriorating the air quality over Shaoxing as a result.
作者
严佩文
张立波
YAN Peiwen;ZHANG Libo(Shaoxing Meteorological Bureau,Shaoxing 312000)
出处
《环境科学学报》
CAS
CSCD
北大核心
2024年第10期72-82,共11页
Acta Scientiae Circumstantiae
基金
浙江省自然科学基金重点项目(No.LZJMZ23D050001)
浙江省基础公益计划项目(No.LGF22D050007)
浙江省气象局重点项目(No.2020ZD07)
浙江省气象局一般项目(No.2022YB22)。
