Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/80510
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dc.contributor.authorFu, Xen_US
dc.contributor.authorWang, Ten_US
dc.contributor.authorZhang, Len_US
dc.contributor.authorLi, QYen_US
dc.contributor.authorWang, Zen_US
dc.contributor.authorXia, Men_US
dc.contributor.authorYun, Hen_US
dc.contributor.authorWang, WHen_US
dc.contributor.authorYu, Cen_US
dc.contributor.authorYue, DLen_US
dc.contributor.authorZhou, Yen_US
dc.contributor.authorZheng, JYen_US
dc.contributor.authorHan, Ren_US
dc.date.accessioned2019-03-26T09:17:36Z-
dc.date.available2019-03-26T09:17:36Z-
dc.date.issued2019-
dc.identifier.citationAtmospheric chemistry and physics, 2 Jan. 2019, v. 19, no. 1, p. 1-14en_US
dc.identifier.issn1680-7316-
dc.identifier.urihttp://hdl.handle.net/10397/80510-
dc.description.abstractNitrous acid (HONO) can strongly affect atmospheric photochemistry in polluted regions through the production of hydroxyl radicals (OHs). In January 2017, a severe pollution episode occurred in the Pearl River Delta (PRD) of China, with maximum hourly PM2.5, ozone, and HONO levels reaching 400 mu m(-3), 150 ppb, and 8 ppb, respectively, at a suburban site. The present study investigated the sources and processes generating such high HONO concentrations and the role of HONO chemistry in this severe winter episode. Four recently reported HONO sources were added to the Community Multiscale Air Quality (CMAQ) model, including RH-dependent (relative humidity) and light-enhancing effects on heterogeneous reactions, photolysis of particulate nitrate in the atmosphere, and photolysis of HNO3 and nitrate on surfaces. The revised model reproduced the observed HONO and significantly improved its performance for O-3 and PM2.5. The model simulations showed that the heterogeneous generation on surfaces (with RH and light effects) was the largest contributor (72 %) to the predicted HONO concentrations, with the RH-enhancing effects more significant at nighttime and the light-enhancing effects more important in the daytime. The photolysis of total nitrate in the atmosphere and deposited on surfaces was the dominant HONO source during noon and afternoon, contributing above 50 % of the simulated HONO. The HONO photolysis was the dominant contributor to HOx production in this episode. With all HONO sources, the daytime average O-3 at the Heshan site was increased by 24 ppb (or 70 %), compared to the simulation results without any HONO sources. Moreover, the simulated mean concentrations of TNO3 (HNO3+ fine particle NO3-) at the Heshan site, which was the key species for this haze formation, increased by about 17 mu m(-3) (67 %) due to the HONO chemistry, and the peak enhancement reached 55 mu m(-3). This study highlights the key role of HONO chemistry in the formation of winter haze in a subtropical environment.en_US
dc.description.sponsorshipDepartment of Civil and Environmental Engineeringen_US
dc.language.isoenen_US
dc.publisherCopernicus GmbHen_US
dc.relation.ispartofAtmospheric chemistry and physicsen_US
dc.rights© Author(s) 2019. This work is distributed underthe Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/).en_US
dc.rightsThe following publication Fu, X., Wang, T., Zhang, L., Li, Q. Y., Wang, Z., Xia, M., . . . Han, R. (2019). The significant contribution of HONO to secondary pollutants during a severe winter pollution event in southern China. Atmospheric Chemistry and Physics, 19(1), 1-14 is available at https://dx.doi.org/10.5194/acp-19-1-2019en_US
dc.titleThe significant contribution of HONO to secondary pollutants during a severe winter pollution event in southern Chinaen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.spage1-
dc.identifier.epage14-
dc.identifier.volume19-
dc.identifier.issue1-
dc.identifier.doi10.5194/acp-19-1-2019-
dc.identifier.isiWOS:000454688800001-
dc.identifier.scopus2-s2.0-85059511599-
dc.identifier.eissn1680-7324-
dc.description.validate201903 bcrc-
dc.description.oapublished_final-
Appears in Collections:Journal/Magazine Article
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