Characteristic Analysis of OC and EC in PM2.5 of Typical Haze Weather in Wuhan City

• 作者: Hu Ke Huang Zhen Shen Longjiao Yin Ting Zhong Zhangxiong
• 来源期刊: 气象与环境研究：英文版
• 学科: 地球科学
• 关键词: EC值 武汉市 PM2 5 灰霾 天气 生物质燃烧 特征 日均浓度
• 年，卷（期）: qxyhjyjywb_2014,（4）
• 页码范围: 19-22
• 页数: 4页
• 分类号: X513

摘要

Long-time large-area haze weather appeared in Wuhan on June 11,2012. It was monitored that PM2. 5hourly concentration obviously rose,and peak value reached 658 μg /m3. OC and PM2. 5presented high correlation,and correlation coefficient was 0. 96. OC daily average concentration occupied 10%-20% in PM2. 5,and difference was big between haze and normal weather. EC occupied 5%,and difference was very small between haze and normal weather. By analyzing change trend of OC/EC,it was found that OC/EC presented increasing trend in late May and was even higher than that during 11-15 June. It was clear that biomass combustion taking straw as the representation has started in late May.But two strong precipitation on May 29 and June 6 inhibited haze weather,and specific meteorological condition caused haze on June 11. Proportion of SOC to OC reached 14%-70%,illustrating that daily difference of secondary photochemical reaction was very big in Wuhan. OC/EC values were respectively 2. 7,3. 5 and 4. 2 in May,June and haze period. SOC daily means were respectively( 5. 33 ±4. 77) and( 32. 5 ±23. 4) μg /m3in May and haze period. Major pollution source of haze weather was biomass combustion,and haze occurrence had very big relationship with special meteorological condition.