DOI: 10.1016/j.atmosenv.2014.09.019
Scopus记录号: 2-s2.0-84907985648
论文题名: Seasonal characteristics of biogenic and anthropogenic isoprene in tropical-subtropical urban environments
作者: Chang C ; -C ; , Wang J ; -L ; , Candice Lung S ; -C ; , Chang C ; -Y ; , Lee P ; -J ; , Chew C ; , Liao W ; -C ; , Chen W ; -N ; , Ou-Yang C ; -F
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 99 起始页码: 298
结束页码: 308
语种: 英语
英文关键词: BVOC
; Isoprene
; Ozone
; SOA
; Urban air
; Vehicular tracer
Scopus关键词: Ozone
; BVOC
; Seasonal characteristics
; SOA
; Urban air
; Urban environments
; Vehicular tracer
; Isoprene
; 1,3 butadiene
; isoprene
; ozone
; volatile organic compound
; anthropogenic effect
; atmospheric pollution
; biogenic emission
; isoprene
; ozone
; seasonal variation
; tracer
; traffic emission
; urban atmosphere
; volatile organic compound
; adaptation
; Article
; autumn
; boundary layer
; circadian rhythm
; city
; environmental temperature
; high temperature
; human
; latitude
; meteorology
; photosynthetically active radiation
; radiation
; seasonal variation
; spring
; suburban area
; summer
; Taiwan
; traffic
; tropic climate
; tropics
; urban area
; vegetation
; winter
; Taipei
; Taiwan
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Measurements of atmospheric isoprene and other selected volatile organic compounds (VOCs) were conducted in Taipei, a tropical-subtropical metropolis, to investigate diurnal variations, seasonal diversity and spatial differences in terms of the levels and sources of isoprene. Our study also investigated the responses of biogenic isoprene to both light flux and temperature in real urban settings that have a variety of plant species and traffic volumes. The robust ratio of isoprene/1,3-butadiene obtained from pure traffic emissions was used as a gauge to separate biogenic isoprene from traffic emissions. The four seasonal measurements at a typical urban site in the city showed that biogenic contributions overwhelmed their anthropogenic counterparts in summer and dominated the daytime isoprene levels in spring and autumn. Even in winter, biogenic sources still contributed a non-negligible fraction of approximately 44% to daytime isoprene. Furthermore, the concentration contour of isoprene extrapolated from the data at 38 sites throughout the city revealed that high levels of biogenic isoprene were generally a widespread phenomenon in summer in the tropical-subtropical city. A three-dimensional plot of the isoprene/1,3-butadiene ratio, ambient temperatures and radiation flux showed a temperature threshold of biogenic isoprene emissions, beyond which the biogenic contribution began to increase exponentially with enhanced ambient temperature. However, when the ambient temperature was below the threshold, there was no or negligible biogenic contribution to the ambient isoprene, regardless of the strength of the radiation flux. The temperature threshold (approximately 17-21°C) of isoprene emissions in the tropical-subtropical city was much higher than the thresholds in cities and areas at temperate latitudes, indicating that the adaptation of vegetation to different temperature zones via isoprene emission may be characteristic. © 2014 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80572
Appears in Collections: 气候变化事实与影响
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作者单位: Research Center for Environmental Changes, Academia Sinica, Taipei, Taiwan; Department of Chemistry, National Central University, Chungli, Taiwan
Recommended Citation:
Chang C,-C,, Wang J,et al. Seasonal characteristics of biogenic and anthropogenic isoprene in tropical-subtropical urban environments[J]. Atmospheric Environment,2014-01-01,99