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Atmospheric new particle formation from sulfuric acid and amines in a Chinese megacity
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Number of Authors: 302018 (English)In: Science, ISSN 0036-8075, E-ISSN 1095-9203, Vol. 361, no 6399, p. 278-281Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2018. Vol. 361, no 6399, p. 278-281
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-159060DOI: 10.1126/science.aao4839ISI: 000439145800043PubMedID: 30026225OAI: oai:DiVA.org:su-159060DiVA, id: diva2:1242452
Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2018-08-28Bibliographically approved

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Bianchi, FedericoKontkanen, JenniEhn, MikaelWang, MingyiWang, XinkeWang, DongfangLi, LiWang, HongliPetäjä, TuukkaWang, Lin
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Department of Environmental Science and Analytical Chemistry
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