【作者】 邓雪娇； 王新明； 赵春生； 冉靓； 李菲； 谭浩波； 邓涛； 吴兑； 周秀骥；

【Author】 DENG Xue-jiao1,WANG Xin-ming2,ZHAO Chun-sheng3,RAN Liang3,LI Fei1,TAN Hao-bo1,DENG Tao1,WU Dui1,ZHOU Xiu-ji4(1.Institute of Tropical and Marine Meteorology/Key Open Laboratory for Tropical Monsoon,China Meteorological Administration,Guangzhou 510080,China;2.Guangzhou Institute of Geochemistry Chinese Academy of Sciences,Guangzhou 510640,China;3.Department of Atmospheric Science;School of Physics;Peking University;Beijing,100871,China;4.Chinese Academy of Meteorological Sciences,CMA,Beijing 100081,China)

【机构】 中国气象局广州热带海洋气象研究所/中国气象局热带季风重点开放实验室； 中国科学院广州地球化学研究所； 北京大学物理学院大气科学系； 中国气象科学研究院；

【摘要】 分析了珠江三角洲秋季VOCs在相对污染与清洁情况下的日变化特征.污染情况下的VOCs质量浓度可达清洁情况下的2.2倍,污染富集的是甲苯、二甲苯、乙苯、正丁烷、戊烷、丙烷、乙炔、乙烯等物种.自然排放的异戊二烯具有早晚浓度低而白天浓度高的日变化规律,体现植物的光合作用特征;而人类活动污染排放的甲苯其日变化规律基本反映了气象条件与污染源排放日变化的影响,在相对污染情况下早上出现明显的污染富集,午后出现污染低值.反应活性较强的物质主要是烯烃(反式-2-丁烯、异戊二烯、顺2-戊烯)与芳香烃(间对-二甲苯、甲苯);烯烃的质量百分比最低,却占最高的化学反应活性百分比.更多还原

【Abstract】 The diurnal features of VOCs in relative pollution and clean processes in autumn over Pearl River Delta(PRD) are analyzed.The mass concentration of VOCs under pollution circumstances can be 2.2 times as high as that with clean process.Contributed to pollution enrichment are the pollutants of toluene,xylene,ethylbenzene,butane,pentane,propane,acetylene and ethane,etc.The isoprene emitted from nature has the diurnal features of lower concentration in the morning and evening versus higher concentration during daytime,indicating characteristics of botanic photosynthesis,while toluene from anthropogenic emission has the diurnal features which basically reveal the effects of diurnal changes of meteorological condition and source emission,with obvious pollution enrichment in the morning and lower concentration in the afternoon under relative pollution circumstances.Relatively more active reactivity pollutants include alkene(trans-2-butene,isoprene,cis-2-pentene) and aromatic hydrocarbon(m/p-xylene,toluene),of which alkene has the lowest mass percentage while having the highest chemical reactivity percentage.更多还原