DOI: 10.1016/j.atmosenv.2014.03.033
Scopus记录号: 2-s2.0-84897066154
论文题名: Investigation of the impact of short-timescale NOx variability on annual mean oxidant partitioning at UK sites
作者: Jenkin M ; E
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 90 起始页码: 43
结束页码: 50
语种: 英语
英文关键词: Air quality
; Local pollution
; Monitoring networks
; Nitrogen dioxide
; Oxidant
; Ozone
; Policy models
; Regional pollution
Scopus关键词: Air quality
; Display devices
; Oxidants
; Ozone
; Pollution
; Roadsides
; Local pollutions
; Monitoring network
; Nitrogen dioxides
; Policy model
; Regional pollution
; Nitrogen oxides
; nitrogen dioxide
; atmospheric pollution
; background level
; concentration (composition)
; data set
; empirical analysis
; European Union
; nitrogen oxides
; oxidant
; ozone
; partitioning
; pollution policy
; roadside environment
; air quality
; article
; averaging
; environmental impact
; measurement
; oxidant partitioning
; pollution
; priority journal
; resource partitioning
; United Kingdom
; United Kingdom
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: Empirical assessments of annual mean [NO2] have often made use of expressions describing its non-linear [NOx]-dependence, based on fitting to a large number of observations. These studies have also shown that annual mean [NO2] data possess a large amount of scatter, such that the target [NOx] that corresponds to the EU annual mean NO2 limit value (40μgm-3) can vary considerably from one site to another. A contribution to this scatter is shown to result from site-to-site variations in the [NOx]-averaging of the non-linear impact of the chemical coupling of NOx and O3 over the annual range of ambient conditions. The variability in the partitioning of oxidant (OX) into its component forms of NO2 and O3 is used as a diagnostic, with a particular focus on the impact of short-timescale [NOx] variability. Annual mean monitoring data from 95 UK sites reporting co-located measurements of O3 and NOx are used in the analysis, consisting of 906 site-years of annual mean concentrations measured over the period 1991-2011. The ratio of the upper and lower quartiles of the annual distribution of hourly mean [NOx] (the quartile ratio, QR) is used as a practical indicator of [NOx] variability. The data in a series of QR intervals are shown to deviate systematically from an idealised [NO2]/[OX] vs. [NOx] curve. The data are well-described by [NOx]-averaging the idealised curve, with QR being well correlated with the range of [NOx] over which the curve is averaged, providing strong evidence of a systematic impact of short-timescale [NOx] variability. A combined analysis of the data for sites nominally categorised as roadside, background and rural shows that (although scattered) the values of QR in each category apparently display systematic trends with annual mean [NOx], showing progressive increases in QR with decreasing [NOx] at roadside and polluted background sites. These dependences are used to interpolate between [NO2]/[OX] vs. [NOx] expressions based on constant QR to produce representative expressions for background and roadside sites. These may be appropriate for application in empirical policy models, with the high level of scatter for each site category being rationalised by the associated range in QR. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80974
Appears in Collections: 气候变化事实与影响
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作者单位: Atmospheric Chemistry Services, Okehampton, Devon EX20 1FB, United Kingdom; School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, United Kingdom
Recommended Citation:
Jenkin M,E. Investigation of the impact of short-timescale NOx variability on annual mean oxidant partitioning at UK sites[J]. Atmospheric Environment,2014-01-01,90