Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/74627
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dc.contributor.authorLi, Zen_US
dc.contributor.authorXue, Len_US
dc.contributor.authorYang, Xen_US
dc.contributor.authorZha, Qen_US
dc.contributor.authorTham, YJen_US
dc.contributor.authorYan, Cen_US
dc.contributor.authorLouie, PKKen_US
dc.contributor.authorLuk, CWYen_US
dc.contributor.authorWang, Ten_US
dc.contributor.authorWang, Wen_US
dc.date.accessioned2018-03-29T07:17:20Z-
dc.date.available2018-03-29T07:17:20Z-
dc.date.issued2018-
dc.identifier.citationScience of the total environment, 2018, v. 612, p. 1114-1122en_US
dc.identifier.issn0048-9697-
dc.identifier.urihttp://hdl.handle.net/10397/74627-
dc.description.abstractAtmospheric oxidizing capacity (AOC), dominated by the hydroxyl radical (OH), is an important index of the self-cleaning capacity of atmosphere and plays a vital role in the tropospheric chemistry. To better understand the key processes governing the chemistry of rural atmosphere of southern China, we analyzed the oxidation capacity and radical chemistry at a regional background site in Hong Kong from 23 August to 22 December 2012, which covered the summer, autumn and winter seasons. A chemical box model built on the latest Master Chemical Mechanism (v3.3) was used to elucidate the OH reactivity and sources of ROX radicals (ROX = OH + HO2 + RO2). The AOC showed a clear seasonal pattern with stronger intensity in late summer compared to autumn and winter. Reactions with NO2 (30%) and oxygenated volatile organic compounds (OVOCs) (31%) together dominated the OH loss in summer, while reactions with CO (38% in autumn and 39% in winter) and OVOCs (34% in autumn and 25% in winter) made larger contributions in autumn and winter. Photolysis of O3 (36%–47%) presented the major ROX source during all three seasons. The second largest ROx source was HONO photolysis (25%) in summer compared to HCHO photolysis in autumn (20%) and winter (21%). Besides, photolysis of other OVOCs was another important primary source of ROx radicals with average contributions of 14%, 13% and 20% for the summer, autumn and winter cases, respectively. Overall, the present study evaluates the oxidizing capacity of the rural atmosphere of South China and elucidates the varying characteristics of photochemical processes in different air masses.en_US
dc.description.sponsorshipDepartment of Civil and Environmental Engineeringen_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofScience of the total environmenten_US
dc.subjectAtmospheric oxidizing capacityen_US
dc.subjectObservation-based modelen_US
dc.subjectOH reactivityen_US
dc.subjectRadical sourceen_US
dc.subjectSouthern Chinaen_US
dc.titleOxidizing capacity of the rural atmosphere in Hong Kong, Southern Chinaen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.spage1114-
dc.identifier.epage1122-
dc.identifier.volume612-
dc.identifier.doi10.1016/j.scitotenv.2017.08.310-
dc.identifier.scopus2-s2.0-85028928430-
dc.identifier.eissn1879-1026-
dc.identifier.rosgroupid2017002920-
dc.description.ros2017-2018 > Academic research: refereed > Publication in refereed journal-
dc.description.validate201802 bcrc-
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