caa a22 4500 530059894 20200725032027.0 cr unu---uuuuu 181025s2018 xx s 000 0 eng 2169-897X 10.1029/2017JD027952 doi (BORIS)oai:boris.unibe.ch:116681 570 ddc 540 ddc Evidence of Rural and Suburban Sources of Urban Haze Formation in China: A Case Study From the Pearl River Delta Region [Elektronische Daten] [Junwen Liu, Ping Ding, Zheng Zong, Jun Li, Chongguo Tian, Weihua Chen, Ming Chang, Gary Abdiel Salazar Quintero, Chengde Shen, Zhineng Cheng, Yingjun Chen, Xuemei Wang, Sönke Szidat, Gan Zhang] publishedVersion openAccess eu-repo Although particulate matter (PM)-driven haze is a common phenomenon in many Chinese cities, studies on the sources of its key components, such as organic carbon (OC) and elemental carbon (EC), are poorly constrained. In this study, PM with aerodynamic diameters less than 10 (PM10), 2.5 (PM2.5), and 1 μm (PM1) were collected at an urban site in the core city of the Pearl River Delta region in summer 2013. The average PM10, PM2.5, and PM1 mass concentrations were 109 ± 28.4, 57.7 ± 15.0, and 50.9 ± 13.2 μg/m3, respectively. A PM-driven haze bloom-decay process was observed from 9 to 14 July and studied based on radiocarbon (14C) and stable nitrogen isotope (15N). The 14C results revealed that 87% of EC and 53% of OC in PM2.5 were derived from fossil sources on a typical summer day (9 July), while these values fell to 79% and 40% on 12 July and 76% and 29% on 13 July, respectively, due to the invasion of nonfossil-enriched air masses from rural/suburban areas. In addition, a 15N-derived model showed that nonfossil sources contributed 5% of NH3 on 9 July, which increased to about 80% on 12 and 13 July. However, the 15N-NO3- values were relatively stable, probably because of the large area of overlap in 15N-NOx from biomass burning and traffic exhaust. To our knowledge, this work is the first study to report both daily 14C and 15N signals in China and identify nonfossil sources from rural/suburban areas as triggers of summer haze. Liu Junwen joint author Ding Ping joint author Zong Zheng joint author Li Jun joint author Tian Chongguo joint author Chen Weihua joint author Chang Ming joint author Salazar Quintero Gary Abdiel joint author Shen Chengde joint author Cheng Zhineng joint author Chen Yingjun joint author Wang Xuemei joint author Szidat Sönke joint author Zhang Gan joint author Journal of Geophysical Research: Atmospheres 123(9), pp. 4712-4726 2169-897X https://boris.unibe.ch/116681/1/Liu_14C%28OC%2CEC%29%20at%20Pearl%20River%20Delta%20%28JGR%202018%29.pdf text/html WWW-Backlink auf das Repository BK010053 XK010053 XK010000 1 info:eu-repo/semantics/article boris PeerReviewed boris peerstatus BORIS BORIS BORIS info:eu-repo/semantics/article openAccess BORIS 856 40 https://boris.unibe.ch/116681/1/Liu_14C%28OC%2CEC%29%20at%20Pearl%20River%20Delta%20%28JGR%202018%29.pdf text/html WWW-Backlink auf das Repository BORIS 700 1- Liu Junwen joint author BORIS 700 1- Ding Ping joint author BORIS 700 1- Zong Zheng joint author BORIS 700 1- Li Jun joint author BORIS 700 1- Tian Chongguo joint author BORIS 700 1- Chen Weihua joint author BORIS 700 1- Chang Ming joint author BORIS 700 1- Salazar Quintero Gary Abdiel joint author BORIS 700 1- Shen Chengde joint author BORIS 700 1- Cheng Zhineng joint author BORIS 700 1- Chen Yingjun joint author BORIS 700 1- Wang Xuemei joint author BORIS 700 1- Szidat Sönke joint author BORIS 700 1- Zhang Gan joint author BORIS 773 0- Journal of Geophysical Research: Atmospheres 123(9), pp. 4712-4726 2169-897X