DOI: 10.1016/j.atmosenv.2014.05.040
Scopus记录号: 2-s2.0-84901684954
论文题名: Aircraft observations of the lower troposphere above a megacity: Alkyl nitrate and ozone chemistry
作者: Aruffo E ; , Di Carlo P ; , Dari-Salisburgo C ; , Biancofiore F ; , Giammaria F ; , Busilacchio M ; , Lee J ; , Moller S ; , Hopkins J ; , Punjabi S ; , Bauguitte S ; , O'Sullivan D ; , Percival C ; , Le Breton M ; , Muller J ; , Jones R ; , Forster G ; , Reeves C ; , Heard D ; , Walker H ; , Ingham T ; , Vaughan S ; , Stone D
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2014
卷: 94 起始页码: 479
结束页码: 488
语种: 英语
英文关键词: Aircraft
; Alkyl nitrates production
; London
; Ozone production
; Tropospheric chemistry
; Urban pollution
Scopus关键词: Aircraft
; Aircraft control
; Aircraft instruments
; Chemical analysis
; Nitrates
; Nitric acid
; Nitrogen oxides
; Ozone
; Paraffins
; Titration
; Troposphere
; Alkyl nitrates
; London
; Ozone production
; Tropospheric chemistry
; Urban pollutions
; Atmospheric chemistry
; alkane derivative
; alkyl group
; alkyl nitrate
; nitric acid derivative
; nitrogen oxide
; ozone
; peroxide
; unclassified drug
; aircraft emission
; atmospheric pollution
; concentration (composition)
; metropolitan area
; nitrogen compound
; observational method
; ozone
; troposphere
; urban pollution
; volatile organic compound
; air pollution
; aircraft
; article
; concentration (parameters)
; geochemistry
; human
; observational method
; ozone layer
; photochemistry
; plume
; priority journal
; space flight
; titrimetry
; troposphere
; United Kingdom
; urban area
; England
; London [England]
; 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: Within the framework of the RONOCO (ROle of Nighttime chemistry in controlling the Oxidising Capacity of the atmOsphere) campaign a daytime flight over the metropolitan area of London were carried out to study the nitrogen oxide chemistry and its role in the production and loss of ozone (O3) and alkyl and multifunctional nitrate (σANs). The FAAM BAe-146 aircraft, used for these observations, was equipped with instruments to measure the most relevant compounds that control the lower troposphere chemistry, including O3, NO, NO2, NO3, N2O5, HNO3, peroxy nitrates (σPNs), σANs, OH, and HO2. In the London's flight a strong ozone titration process was observed when flying above Reading (downwind of London) and when intercepting the London plume. The coupled cycles of NOx and HOx can have different terminations forming σPNs, σANs, HNO3 or peroxides (H2O2, ROOH) altering the O3 production. In the observations reported here, we found that a strong ozone titration (δO3=-16ppb), due to a rapid increase of NOx (δNOx=27ppb), corresponds also to a high increase of σANs concentrations (δσANs=3ppb), and quite stable concentrations of HNO3 and σPNs. Unexpectedly, compared with other megacities, the production of σANs is similar to that of Ox (O3+NO2), suggesting that in the London plume, at least during these observations, the formation of σANs effectively removes active NOx and hence reduces the amount of O3 production. In fact, we found that the ratio between the ozone production and the alkyl nitrates production (observed) approximate the unity; on the contrary the calculated ratio is 7. In order to explain this discrepancy, we made sensitivity tests changing the alkyl nitrates branching ratio for some VOCs and we investigated the impact of the unmeasured VOCs during the flight, founding that the calculated ratio decreases from 7 to 2 and that, in this condition, the major contribution to the σANs production is given by Alkanes. Observations and analysis reported here suggest that in the London plume the high NOx emissions and the chemistry of some VOCs (mainly Alkanes) produce high concentrations of σANs competing against the local ozone production. © 2014 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/80826
Appears in Collections: 气候变化事实与影响
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作者单位: Center of Excellence CETEMPS Universita' degli studi di L'Aquila, Via Vetoio, 67010 Coppito, L'Aquila, Italy; Dipartimento di Scienze Fisiche e Chimiche, Universita' degli studi di L'Aquila, Via Vetoio, 67010 Coppito, L'Aquila, Italy; Departement of Chemistry, University of York, United Kingdom; FAAM, Cranfileld University, United Kingdom; Observation Based Research (OBR), Met Office, FitzRoy Road, Exeter EX1 3PB, United Kingdom; School of Earth, Atmospheric and Environmental Science, The University of Manchester, United Kingdom; Department of Chemistry, University of Cambridge, United Kingdom; University of East Anglia, School of Environmental Sciences, United Kingdom; University of Leeds, School of Chemistry, United Kingdom; University of Leeds, National Centre for Atmospheric Science, United Kingdom
Recommended Citation:
Aruffo E,, Di Carlo P,, Dari-Salisburgo C,et al. Aircraft observations of the lower troposphere above a megacity: Alkyl nitrate and ozone chemistry[J]. Atmospheric Environment,2014-01-01,94