滁州市一次持续性臭氧污染过程气象与传输特征分析
Meteorological and Transport Characteristics of a Persistent Ozone Pollution Process in Chuzhou City
王雷 1周颖 1龚年祖2
作者信息
- 1. 池州学院地理与规划学院自然资源遥感应用研究中心,安徽 池州 247000
- 2. 滁州市气象局,安徽 滁州 239000
- 折叠
摘要
2019 年 6 月 8 日至 17 日,安徽省滁州市发生一次持续性臭氧(O3)污染过程,O3 浓度值超过国家二级标准浓度限值 3%～45%.基于滁州市老年大学监测站点空气质量数据、滁州市气象站及全球资料同化系统(GDAS)气象数据,运用 HYSPLIT后向轨迹模型、潜在源贡献因子(PSCF)和浓度权重轨迹(CWT)分析方法,研究污染发生时段的气象和区域传输特征.结果表明:①在此次 O3 污染过程中,日最高温度的变化范围为 25.5～34.7℃,风速整体小于 4 m/s,风向以偏东风为主,午后的相对湿度在 40%左右.在该时段内,滁州市基本处于均压场的控制之中,且受到锋面气旋外围下沉气流的影响,大气层结稳定.②O3 污染发生期间,滁州市主要受东南方向气流的影响,但来自山东省、安徽省北部和江苏省北部的气流的影响也不容忽视.6 月 9 日夜间至 10 日上午的O3 浓度异常高值,与 9 日下午的气压异常低值及 9 日夜间的大气边界层高度异常高值密切相关.上述气压及大气边界层高度异常值的出现使得上风向高浓度 O3 被输送至滁州.③此次污染过程的潜在贡献源区主要分布于安徽省东南部、江苏省中西部和浙江省北部等地.上述区域的加权潜在源贡献因子(WPSCF)值大于 0.4,加权浓度权重轨迹(WCWT)值超过了 100 μg/m3.今后,滁州市在O3 污染防控工作中应加强与上述区域的联防联控.
Abstract
From June 8 to 17,2019,a persistent ozone pollution occurred in Chuzhou City,Anhui Province,with concentration values exceeding the national secondary limits by 3%-45%.HYSPLIT backward trajectory model,potential source contribution factor(PSCF),and concentration weight trajectory(CWT)methods were applied to study the meteorological and regional transport characteristics during the pollution period,based on air quality data from monitoring stations at Chuzhou Senior University,meteorological data from meteorological stations in Chuzhou City and the Global Data Assimilation System(GDAS).The results showed that:① during this ozone pollution,the daily maximum temperature ranged from 25.5℃to 34.7℃,the wind speed was less than 4 m/s,the wind direction was dominated by easterly winds,and the relative humidity in the afternoon was around 40%.The atmospheric layer in Chuzhou was stable since the city was mainly under the control of the atmospheric mean pressure field and the sinking airflow at the periphery of the cyclone during this pollution period.②Chuzhou City was mainly influenced by southeast-oriented airflow during the study period,but the impact of airflow from Shandong Province,northern Anhui Province and northern Jiangsu Province should not be ignored.The anomalously low pressure in the afternoon of June 9 and the anomalously high boundary layer height at night,which caused the transfer of high ozone concentrations upwind,were strongly associated with the anomalously high ozone values from the night of June 9 to the morning of June 10.③Southeastern Anhui Province,central and western Jiangsu Province,and northern Zhejiang Province were the key locations of the possible contributing source regions for this pollution.Weighted potential source contribution factor(WPSCF)values in the aforementioned locations were higher than 0.4,and weighted concentration weight trajectory(WCWT)values were higher than 100 g/m3.Chuzhou City should focus on strengthening collaborative ozone pollution prevention and control with these locations.
关键词
臭氧/气象/污染输送/潜在贡献源区/滁州Key words
ozone/meteorology/pollutants transportation/potential contribution source area/Chuzhou引用本文复制引用
基金项目
安徽省高校自然科学研究重点项目(KJ2020A0758)
安徽省高校优秀青年人才支持计划项目(gxyq2022116)
安徽省高等学校质量工程项目(2020jyxm1295)
出版年
2024
NETL
NSTL
维普
万方数据