江苏PM2.5-O3复合污染特征及气象条件分析

严文莲; 刘端阳; 王磊; 李聪

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中国环境科学 ›› 2023, Vol. 43 ›› Issue (10) : 5098-5106.

大气污染与控制

江苏PM_2.5-O₃复合污染特征及气象条件分析

严文莲^1,2, 刘端阳², 王磊¹, 李聪³

作者信息 +

Analysis of characteristics and meteorological conditions of PM_2.5-O₃ compound pollution in Jiangsu province

YAN Wen-lian^1,2, LIU Duan-yang², WANG Lei¹, LI Cong³

Author information +

文章历史 +

摘要

基于2013~2020年江苏13个城市的大气污染和气象观测数据，分析了江苏PM_2.5-O₃复合污染物的分布特征及其与气象条件的关系.结果表明：江苏复合污染物以轻度污染组合为主，南部多于北部，东南部最多，主要在4~10月，下午至傍晚最高，且该时段O₃平均浓度高于单一O₃污染；复合污染在O₃超标中平均占比15.7%，2014年高达65.8%，且在2015年后明显下降；PM_2.5和O₃二者在暖季O₃污染期正相关，PM_2.5污染期为弱相关或负相关；复合污染气象条件更为严格，气温、相对湿度、风速和逆温条件均介于单一O₃和单一PM_2.5污染之间，且多在4m/s以下和ENE—S区间，与单一O₃污染相比，气温和风速略低，相对湿度和逆温强度略高；出现复合污染的主要地面形势为均压场和低压（底）前部，其次是入海高压后部和高压底部；通过后向轨迹聚类分析发现淮北地区复合污染主要来自东南沿海至本地路径，中南部城市主要为本地周边地区和东南沿海，而东南部城市主要来源短距离输送和苏皖浙交界一带.

Abstract

Based on the air pollution and meteorological observation data of 13cities in Jiangsu Province from 2013 to 2020, the distribution characteristics of PM_2.5-O₃ compound air pollutants and their relationship with meteorological conditions were analyzed. The results showed that the occurrence frequency of compound pollutants in Jiangsu were mainly composed of light pollution combinations, with more in the south, especially in the southeast. The compound air pollutants mainly appeared from April to October, with the highest concentration from afternoon to evening, and the average concentration of ozone during this period was higher than that of single ozone pollution; The average compound pollution days account for 15.7% of high ozone days, which was as high as 65.8% in 2014 and has significantly decreased since 2015. There was a positive correlation between PM_2.5 and ozone concentrations in the warm season ozone pollution period, and a weak or negative correlation in the PM_2.5 pollution period. The air temperature, relative humidity, wind speed and inversion conditions during the compound air pollution period are between single ozone pollution and PM_2.5 pollution, mostly of them are below 4m/s and in the ENE-S wind direction range. Compared with the single ozone pollution, air temperature and wind speed are slightly lower, while relative humidity and inversion intensity are slightly higher during the compound air pollution. The main surface situations of compound pollution are the uniform pressure field and the front of low pressure (bottom), followed by the rear of high pressure into the sea and the bottom of high pressure. Through the backward trajectory cluster analysis, it is found that the compound pollution in Huaibei area mainly comes from the southeast coast to the local path, the central and southern cities mainly come from the surrounding areas and the southeast coastal area, and the southeastern cities mainly come from the short-distance transport and the Jiangsu-Anhui-Zhejiang border area.

导出引用

严文莲, 刘端阳, 王磊, 李聪. 江苏PM_2.5-O₃复合污染特征及气象条件分析[J]. 中国环境科学. 2023, 43(10): 5098-5106

YAN Wen-lian, LIU Duan-yang, WANG Lei, LI Cong. Analysis of characteristics and meteorological conditions of PM_2.5-O₃ compound pollution in Jiangsu province[J]. China Environmental Science. 2023, 43(10): 5098-5106

中图分类号： X51

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