大连市降水对气态污染物影响研究  

Study on the Impact of Precipitation on Gaseous Pollutants in Dalian City

作　　者：陈鑫 范慧君 王笑欢 娄英斌 张连宇 CHEN Xin;FAN Hui-jun;WANG Xiao-huan;LOU Ying-bin;ZHANG Lian-yu(Dalian Ecological Environment Monitoring Center,Dalian 116023,China)

机构地区：[1]辽宁省大连生态环境监测中心,辽宁大连116023

出　　处：《黑龙江生态工程职业学院学报》2025年第2期7-10,17,共5页Journal of Heilongjiang Vocational Institute of Ecological Engineering

摘　　要：基于大连市污染物浓度、降水数据,从降水量大小、月变化、初始浓度等深入研究降水对气态污染物的清除作用。结果表明:SO_(2)、NO_(2)降水日比无降水日浓度分别下降36.5%、29.6%。污染物浓度随降水量增加而降低,降水量50 mm以上下降幅度最大。当降水量为25.0—49.9 mm时,污染物的平均清洗率及正清洗比例达到较高水平。春季、秋季降水作用好于夏季,冬季可能更易出现吸湿增长。SO_(2)、NO_(2)的初始浓度与降水当日浓度存在正相关关系,当降水前SO_(2)初始浓度高于10μg/m^(3)或者NO_(2)初始浓度高于30μg/m^(3),降水的清除效果最优。同时以一次降水过程为例分析了气态污染物的变化。Based on the concentration of pollutants and precipitation data in Dalian city,this study delves into the scavenging effect of rainfall on gaseous pollutants from aspects such as precipitation amount,monthly variation,and initial concentration.The results show that the concentrations of SO_(2) and NO_(2) decreased by 36.5% and 29.6% on rainy days compared to non-rainy days respectively.The concentration of pollutants decreases with increased precipitation,with the greatest reduction occurring when the precipitation exceeds 50 mm.When the precipitation is between 25.0 to 49.9 mm,the average washout rate and positive washout proportion of pollutants reach higher levels.The scavenging effect of rainfall in spring and autumn is better than in summer,while winter may be more prone to hygroscopic growth.There is a positive correlation between the initial concentrations of SO_(2) and NO_(2) and their concentrations on the day of precipitation;the optimal scavenging effect occurs when the initial concentration of SO_(2) before precipitation is higher than 10μg/m^(3) or the initial concentration of NO_(2) is higher than 30μg/m^(3).Additionally,an example of a single precipitation event is analyzed to examine the changes in gaseous pollutants.

关 键 词：大连市 降水 清除作用 气态污染物 

分 类 号：X5[环境科学与工程—环境工程]