广昌县城区近地面臭氧污染特征及气象影响因子分析  

Characteristics and meteorological factors analysis of surface ozone pollutionin urban area of Guangchang County, Jiangxi Province

作　　者：谢文韬 魏凌云 易嘉箐 Xie Wentao;Wei Lingyun;Yi Jiajing(Guangchang Ecological and Environmental Monitoring Station of Fuzhou City,Fuzhou 34400,China)

机构地区：[1]抚州市广昌生态环境监测站,江西抚州344000

出　　处：《环保科技》2023年第1期41-47,59,共8页Environmental Protection and Technology

摘　　要：利用2017-2021年广昌县城区的近地层臭氧浓度和气象条件的连续监测资料,对臭氧浓度随时间和气象条件变化的特征进行了分析,探讨了各气象因子和综合条件对臭氧浓度的影响。结果表明:(1)近5年广昌县城区的近地面O3-8h年评价的第90百分位数分别为100、96、143、118、96μg·m-3,浓度主要分布在30~80μg·m-3范围,总体水平较低,背景浓度逐年上升。O3-8h超标是本地少量污染天气形成的重要原因;(2)臭氧浓度月际变化呈双峰型,峰值上半年出现在5月份,下半年出现在9月份。多数季节之间浓度差异极显著。日变化呈单峰形,每日5-7时出现最低值,峰值大多数出现在15时左右;(3)O3-8h浓度与相对湿度极显著负相关(r=-0.652,α=0.01),与气温极显著正相关(r=0.368,α=0.01),与气压极显著负相关(r=-0.214,α=0.01),与风向显著相关(r=-0.441,α=0.01),与风速相关性不明显;(4)54%≤RH≤74%,18.1℃≤T≤30.8℃,988.9 hPa≤P≤1004.0 hPa,风向为NNE或N的气象条件下,广昌县城区近地面容易形成臭氧空气污染。Based on the continuous monitoring data of near surface ozone concentration and meteorological conditions in the urban area of Guangchang County from 2017 to 2021,the characteristics of ozone concentration changing with time and meteorological conditions were analyzed,and the effects of various meteorological factors and comprehensive conditions on ozone concentration were analyzed.The results showed that:(1)The 90th percentile of near-surface O 3-8h evaluation in the urban area of Guangchang County in the recent 5 years was 100,96,143,118 and 96μg·m^(-3)respectively,and the concentration was mainly distributed in the range of 30-80μgμg·m^(-3),with the low overall level and the increasing background concentration year by year.The O 3-8h exceeding standard is an important reason for the formation of a small amount of polluted weather in Guangchang County.(2)There was the bimodal pattern for inter-monthly variation of ozone concentration,and the peak appeared in May in the first half of the year and in September in the second half of the year.The concentration difference between most seasons was extremely significant.The diurnal variation of O 3 concentration showed a unimodal distribution,and the lowest value appeared at 5:00-7:00 every day,and the peak value mostly appears around 15:00.(3)The concentration of O 3-8h was negatively significantly correlated with relative humidity(r=-0.652,α=0.01),positively significantly correlated with temperature(r=0.368,α=0.01),negatively significantly correlated with air pressure(r=-0.214,α=0.01),significantly correlated with dominant wind direction(r=-0.441,α=0.01),but not significantly correlated with wind speed.(4)Under the meteorological conditions of 54%≤RH≤74%,18.1≤T≤30.8℃,988.9≤P≤1004.0 hPa,the dominant wind directions were NNE or N wind,it was easy for near surface ozone air pollution to form in the urban area of Guangchang County.

关 键 词：臭氧污染 近地面臭氧 变化特征 气象条件 广昌县 

分 类 号：X515[环境科学与工程—环境工程]