Biogenic isoprene in subtropical urban settings and implications forair quality

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题名:	Biogenic isoprene in subtropical urban settings and implications forair quality
作者:	王家麟;Wang, Jia-Lin;Chew, Clock;Chang, Chih-Yuan;Liao, Wei-Cheng;Lung, Shih-Chun Candice;Chen, Wei-Nai;Lee, Po-Ju;Lin, Po-Hsiung;Chang, Chih-Chung
贡献者:	理學院化學學系
关键词:	air quality;Applied sciences;atmospheric chemistry;Atmospheric pollution;Atmospherics;Autumn;cities;climate;Daytime;environmental factors;Exact sciences and technology;Formations;Isoprene;Oxidants;ozone;pollutants;Pollutants physicochemistry study: properties, effects, reactions, transport and distribution;Pollution;Secondary organic aerosols (SOA);Secondary pollutant;summer;temperature;traffic;urban areas;Urban environments;Vehicular tracer;Volatile organic compounds;Volatile organic compounds (VOCs)
日期:	2013-11-01
上传时间:	2026-04-21 14:15:12 (UTC+8)
出版者:	Elsevier Ltd.;Kidlington: Elsevier Ltd
摘要:	摘要： Isoprene has potentially a large impact on secondary oxidant formation, particularly in the polluted urban atmospheres. The environmental conditions in tropical and subtropical cities with high temperatures and light flux are conducive to the production of large amounts of biogenic isoprene. Measurements of speciated volatile organic compounds (VOCs) were conducted in Taipei, a subtropical metropolis, to investigate the characteristics of biogenic and anthropogenic isoprene during the hot seasons (summer and autumn) and to assess their significance in secondary pollutant formation. The daily and daytime average concentrations of isoprene at the subtropical urban site in summer were 0.72 and 1.26 ppbv, respectively, which were considerably higher than the concentrations of isoprene in most temperate cities. Furthermore, summertime isoprene ranks highest in OH reactivity and second highest in terms of ozone formation potential (OFP) among 66 measured VOCs. The ratios of isoprene to 1,3-butadiene, an exhaust tracer, were used to estimate the fractions of biogenic and anthropogenic isoprene in the urban area. The results reveal that the biogenic contribution apparently overwhelmed the anthropogenic contribution in summertime, although traffic in the city is heavy. Furthermore, the residual isoprene (mostly biogenic) after daytime photochemical loss persisted into the nighttime and contributed a large fraction to nighttime isoprene. In autumn, daytime isoprene was also predominantly from biogenic sources because the hot and sunny conditions persist into the autumn months. The high biogenic isoprene levels in subtropical urban settings and its coherence with OH diurnal cycles accentuate the significance of biogenic isoprene and its potentially great impact on atmospheric oxidant capacity, urban air quality, and even regional climate. •Characteristics of biogenic isoprene in a subtropical metropolis were investigated.•Summertime isoprene ranks highest in OH reactivity among 66 measured VOCs.•Daytime biogenic isoprene overwhelmed anthropogenic isoprene in the summer and autumn.•Daytime residual isoprene contributed a large fraction to nighttime isoprene.•Coherence with OH diurnal cycles underscores the significance of biogenic isoprene. 出版者： Kidlington: Elsevier Ltd 出版日期： 2013-11-01 出處： Atmospheric environment (1994), 2013-11, Vol.79, p.369-379 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2013 Elsevier Ltd 版權： 2015 INIST-CNRS 識別號： ISSN: 1352-2310 識別號： ISSN: 1873-2844 識別號： EISSN: 1873-2844 識別號： DOI: 10.1016/j.atmosenv.2013.06.055
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