合肥地区2013年春节期间PM2.5质量浓度演变特征  

Evolution Characteristics of PM2.5 Mass Concentration During 2013 Spring Festival in Hefei

作　　者：董德保[1] 祝颂[2] 芮斌[1] 

机构地区：[1]安徽省大气探测技术保障中心,安徽合肥230031 [2]合肥市气象局,安徽合肥230041

出　　处：《大气与环境光学学报》2014年第4期268-274,共7页Journal of Atmospheric and Environmental Optics

摘　　要：利用2013年2月8~19日合肥地区获取的大气颗粒物和常规气象观测资料,依据烟花爆竹燃放、降水过程、相对湿度和风速特点,分析了PM2.5质量浓度在不同气象条件下的变化特征。结果表明:合肥春节期间PM2.5质量浓度平均值为58.3μg/m^3,仅出现两个PM2.5质量浓度污染日;城市居民集中燃放烟花爆竹引起PM2.5质量浓度急剧增大,但主要排放PM1;降水过程对PM2.5质量浓度具有湿沉降作用,过程降水量越大,PM2.5质量浓度湿沉降量越大;PM1、PM1~2.5和PM2.5~10与相对湿度的相关系数分别为0.45、0.26和-0.07,粒径尺度越小的颗粒物吸湿增长特性越显著;PM2.5质量浓度演变与风速呈负相关,两者的相关系数为-0.33,风速越大,越利于颗粒物扩散。Based on atmospheric particles and conventional meteorological data from Feb.8 to Feb.19 of 2013 in Hefei, according to the discharge of fireworks, type of precipitation, relative humidity and wind speed characteristics, the variation characteristics of PM2.5 mass concentration in different meteorological conditions were analyzed. The results showed that： during the Spring Festival in Hefei the average value of PM2.5 mass concentration was 58.3 μg/m3, PM2.5 mass concentration pollution occured only two days. pM2.5 mass concentration, caused by urban residents concentrated fireworks discharge, increased rapidly, but the discharge are mostly ultrafine particles （PM1）. PM2.5 mass concentration of precipitation with wet deposition effect, the greater the precipitation process is, the greater the amount of wet deposition of PM2.5 mass concentration will be. Different size scales particles have different hygroscopic growth characteristics, and the correlation coefficients of PM1, PM1--2.5 and PM2.5-10 and relative humidity were 0.45, 0.26 and -0.07. The smaller the size scale particles is, the more obvious the hygroscopic growth properties will be. Evolution of PM2.5 mass concentration was negatively correlated with wind speed, the correlation coefficient is -0.33. The greater the wind speed is, the greater the diffusion capacity of particulate matter will be.

关 键 词：PM2 5质量浓度 演变特征 气象条件 春节期间 

分 类 号：X513[环境科学与工程—环境工程]