东莞市春末夏初O3污染输送路径及来源解析研究

Transport Pathways and Source Apportionment of Ozone in Late Spring and Early Summer in Dongguan

通过综合使用后向轨迹模式的聚类分析法、潜在源贡献函数(PSCF)、浓度加权轨迹方法(CWT)与空气质量模型CAMx臭氧来源解析模块OSAT,分析东莞市春末夏初的臭氧生成敏感性与其来源特征。5月,东莞臭氧生成敏感性经历了从早上NOx敏感到午后VOCs敏感,再逐渐过渡到傍晚NOx敏感的过程。行业来源层面,工业源、天然源与交通源对东莞5月臭氧浓度分别贡献37%、21%与18%。地区来源层面,东莞、惠州与广州三市前体物排放贡献了东莞臭氧浓度的67%。建议未来加强管控珠三角地区工业与交通VOCs污染排放。

Cluster analysis of backward trajectory pattern,potential source region analysis models(PSCF),concentration weighted trajectory method(CWT)and the ozone source analysis module OSAT of air quality model CAMx were used to quantitatively study the characteristics of ozone generation sensitivity and its source in Dongguan City in late spring and early summer.In May,the sensitivity of ozone generation in Dongguan City experienced a process from NOx sensitivity in the morning to VOCs sensitivity in the afternoon,and then gradually transited to NOx sensitivity in the late afternoon.The ozone in Dongguan in May mainly came from industrial sources,natural sources,and traffic sources,accounting for 37%,21%,and 18%of the ozone concentration respectively.In terms of regional sources,precursor emissions from Dongguan,Huizhou and Guangzhou contributed 67%of the ozone concentration in Dongguan.It is suggested to focus on the control of industrial and traffic VOCs emissions in the Pearl River Delta region.