Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A case-study of fine particle concentrations and fluxes measured in a busy street canyon in Manchester, UK
AbstractConcentrations and fluxes of fine particles were measured for 2 weeks in a city centre street canyon with busy traffic. Two optical particle counters (PMS ASASP-X) were operated with ultrasonic anemometers as eddy covariance systems. One system was located at 3.5m height between the road and pavement while the other was periodically cycled through heights of 5, 10, 15 and 18m on a hydraulic lift. At street level, number concentrations in the range 0.1<Dp<0.5μm followed a diurnal cycle similar to that observed in other studies in the urban background, with a peak coinciding with the morning peak in traffic flow. Daytime concentrations were moderated by inverse relationships with wind speed within the canyon, as well as an independent inverse relationship with wind speed measured at a roof-top site 750m from the canyon. The vertical turbulent flux also followed a diurnal cycle similar to that previously observed above an urban canopy, with the greatest flux occurring in the middle of the day. A negative vertical gradient in flux was typically found within the canyon.
A case-study of fine particle concentrations and fluxes measured in a busy street canyon in Manchester, UK
AbstractConcentrations and fluxes of fine particles were measured for 2 weeks in a city centre street canyon with busy traffic. Two optical particle counters (PMS ASASP-X) were operated with ultrasonic anemometers as eddy covariance systems. One system was located at 3.5m height between the road and pavement while the other was periodically cycled through heights of 5, 10, 15 and 18m on a hydraulic lift. At street level, number concentrations in the range 0.1<Dp<0.5μm followed a diurnal cycle similar to that observed in other studies in the urban background, with a peak coinciding with the morning peak in traffic flow. Daytime concentrations were moderated by inverse relationships with wind speed within the canyon, as well as an independent inverse relationship with wind speed measured at a roof-top site 750m from the canyon. The vertical turbulent flux also followed a diurnal cycle similar to that previously observed above an urban canopy, with the greatest flux occurring in the middle of the day. A negative vertical gradient in flux was typically found within the canyon.
A case-study of fine particle concentrations and fluxes measured in a busy street canyon in Manchester, UK
Longley, I.D. (Autor:in) / Gallagher, M.W. (Autor:in) / Dorsey, J.R. (Autor:in) / Flynn, M. (Autor:in)
Atmospheric Environment ; 38 ; 3595-3603
23.03.2004
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch