Atmospheric new particle formation from sulfuric acid and amines in a Chinese megacity

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Yao , L , Garmash , O , Bianchi , F , Zheng , J , Yan , C , Kontkanen , J , Junninen , H , Mazon , S B , Ehn , M , Paasonen , P , Sipilä , M , Wang , M , Wang , X , Xiao , S , Chen , H , Lu , Y , Zhang , B , Wang , D , Fu , Q , Geng , F , Li , L , Wang , H , Qiao , L , Yang , X , Chen , J , Kerminen , V-M , Petäjä , T , Worsnop , D R , Kulmala , M & Wang , L 2018 , ' Atmospheric new particle formation from sulfuric acid and amines in a Chinese megacity ' , Science , vol. 361 , no. 6399 , pp. 278-281 . https://doi.org/10.1126/science.aao4839

Title: Atmospheric new particle formation from sulfuric acid and amines in a Chinese megacity
Author: Yao, Lei; Garmash, Olga; Bianchi, Federico; Zheng, Jun; Yan, Chao; Kontkanen, Jenni; Junninen, Heikki; Mazon, Stephany Buenrostro; Ehn, Mikael; Paasonen, Pauli; Sipilä, Mikko; Wang, Mingyi; Wang, Xinke; Xiao, Shan; Chen, Hangfei; Lu, Yiqun; Zhang, Bowen; Wang, Dongfang; Fu, Qingyan; Geng, Fuhai; Li, Li; Wang, Hongli; Qiao, Liping; Yang, Xin; Chen, Jianmin; Kerminen, Veli-Matti; Petäjä, Tuukka; Worsnop, Douglas R.; Kulmala, Markku; Wang, Lin
Other contributor: University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Aerosol-Cloud-Climate -Interactions (ACCI)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Aerosol-Cloud-Climate -Interactions (ACCI)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)
University of Helsinki, Institute for Atmospheric and Earth System Research (INAR)



Date: 2018-07-20
Language: eng
Number of pages: 4
Belongs to series: Science
ISSN: 0036-8075
DOI: https://doi.org/10.1126/science.aao4839
URI: http://hdl.handle.net/10138/309487
Abstract: Atmospheric new particle formation (NPF) is an important global phenomenon that is nevertheless sensitive to ambient conditions. According to both observation and theoretical arguments, NPF usually requires a relatively high sulfuric acid (H2SO4) concentration to promote the formation of new particles and a low preexisting aerosol loading to minimize the sink of new particles. We investigated NPF in Shanghai and were able to observe both precursor vapors (H2SO4) and initial clusters at a molecular level in a megacity. High NPF rates were observed to coincide with several familiar markers suggestive of H2SO4-dimethylamine (DMA)water (H2O) nucleation, including sulfuric acid dimers and H2SO4-DMA clusters. In a cluster kinetics simulation, the observed concentration of sulfuric acid was high enough to explain the particle growth to similar to 3 nanometers under the very high condensation sink, whereas the subsequent higher growth rate beyond this size is believed to result fromthe added contribution of condensing organic species. These findings will help in understanding urban NPF and its air quality and climate effects, as well as in formulating policies to mitigate secondary particle formation in China.
Subject: OXIDIZED ORGANIC-MOLECULES
YANGTZE-RIVER DELTA
NUMBER CONCENTRATIONS
AEROSOL NUCLEATION
SIZE DISTRIBUTION
EMISSIONS
AMMONIA
GROWTH
TIME
CLUSTERS
114 Physical sciences
116 Chemical sciences
1172 Environmental sciences
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