globalchange  > 气候变化事实与影响
DOI: 10.1016/j.atmosenv.2018.01.027
Scopus记录号: 2-s2.0-85041453011
论文题名:
Diurnal, seasonal, and annual trends in tropospheric CO in Southwest London during 2000–2015: Wind sector analysis and comparisons with urban and remote sites
作者: Hernández-Paniagua I; Y; , Lowry D; , Clemitshaw K; C; , Palmer P; I; , Fisher R; E; , France J; L; , Mendoza A; , O'Doherty S; , Forster G; , Lanoisellé M; , Nisbet E; G
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 177
起始页码: 262
结束页码: 274
语种: 英语
英文关键词: Combustion emission ratio ; Exponential decay ; Road transport ; Spectral analysis
Scopus关键词: Boundary layers ; Carbon ; Carbon monoxide ; Combustion ; Motor transportation ; Roads and streets ; Spectrum analysis ; Transportation ; Wavelet transforms ; Anthropogenic emissions ; Combustion emissions ; Exponential decays ; Meteorological parameters ; Planetary boundary layers ; Road transport sectors ; Road transport sources ; Road transports ; Urban growth ; carbon monoxide ; Article ; atmospheric dispersion ; boundary layer ; circadian rhythm ; circannual rhythm ; combustion ; comparative study ; controlled study ; England ; heating ; meteorology ; priority journal ; seasonal variation ; summer ; traffic and transport ; trend study ; troposphere ; urban area ; wind ; winter
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: Ambient carbon monoxide (CO) and meteorological parameters measured at the Egham (EGH) semi-rural site in SW London during 2000–2015 have permitted wind sector analysis of diurnal and seasonal cycles, and interpretation of long-term trends. CO daily amplitudes are used as a proxy for anthropogenic emissions. At EGH, morning and evening peaks in CO arise from the dominant contribution of road transport sources. Smaller amplitudes are observed during weekends than weekdays due to lower combustion emissions, and for mornings compared to evenings due to the timing of the development and break-up of the nocturnal inversion layer or planetary boundary layer (PBL). A wavelet transform revealed that the dominant mode of CO variability is the annual cycle, with apparent winter maxima likely due to increased CO emissions from domestic heating with summer minima ascribed to enhanced dispersion and dilution during the annual maximum of PBL mixing heights. Over the last two decades, both mitigation measures to reduce CO emissions and also a major switch to diesel cars, have accompanied a change at EGH from the dominance of local diurnal sources to a site measuring close to Atlantic background levels in summer months. CO observed in the S and SW wind sectors has declined by 4.7 and 5.9 ppb yr−1 respectively. The EGH CO record shows the highest levels in the early 2000s, with levels in E and calm winds comparable to those recorded at background stations in Greater London. However, since 2012, levels in S-SW sector have become more comparable with Mace Head background except during rush-hour periods. Marked declines in CO are observed during 2000–2008 for the NE, E, SE (London) and calm wind sectors, with the smallest declines observed for the S, SW and W (background) sectors. For the majority of wind sectors, the decline in CO is less noticeable since 2008, with an apparent stabilisation for NE, E and SE after 2009. The EGH CO data record exhibits a similar but slower exponential decay, but from a much lower starting concentration, than do CO data recorded at selected monitoring sites in urban areas in SE England. CO/CO2 residuals determined using hourly averaged datain the diurnal cycle demonstrate a clear decline in CO from 2000 to 2015 during daily periods of increased vehicle traffic, which is consistent with a sustained reduction in CO emissions from the road transport sector. © 2018
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83054
Appears in Collections:气候变化事实与影响

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作者单位: Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey, United Kingdom; Centro de Ciencias de la Atmosfera, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica S/N, Ciudad Universitaria, Coyoacán, Ciudad de México, Mexico; Cátedras CONACYT – Consorcio CENTROMET, Camino a Los Olvera 44, Los Olvera, Corregidora, Querétaro, Mexico; School of GeoSciences, University of Edinburgh, Alexander Crum Brown Road, Edinburgh, United Kingdom; Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom; British Antarctic Survey, High Cross, Cambridge, United Kingdom; Escuela de Ingeniería y Ciencias, Tecnologico de Monterrey, Av. Eugenio Garza Sada 2501, Monterrey, Nuevo León, Mexico; School of Chemistry, University of Bristol, Cantock's Close, Bristol, United Kingdom; National Centre for Atmospheric Science, School of Environmental Sciences, University of East Anglia, Norwich, United Kingdom

Recommended Citation:
Hernández-Paniagua I,Y,, Lowry D,et al. Diurnal, seasonal, and annual trends in tropospheric CO in Southwest London during 2000–2015: Wind sector analysis and comparisons with urban and remote sites[J]. Atmospheric Environment,2018-01-01,177
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