Meteorological pre-processing and atmospheric dispersion modelling of urban air quality and applications in the Helsinki metropolitan area

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Karppinen, Ari
dc.date.accessioned 2012-02-13T12:32:09Z
dc.date.available 2012-02-13T12:32:09Z
dc.date.issued 2001-11-29
dc.identifier.isbn 951-22-5759-9
dc.identifier.issn 0782-6117
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/2368
dc.description.abstract This theses describes the boundary-layer parameterisation model, which is applied as a meteorological pre-processor by Finnish regulatory dispersion models. The parametrisation scheme is based on the energy-flux method, which evaluates the turbulent heat and momentum fluxes in the boundary layer. A comparison of the model predictions with those of the corresponding scheme of Berkowicz and Brahm, using the same synoptic input data is presented. The comparison shows the basic physical differences between these two models. Some numerical results calculated by these two pre-processors differ substantially, while the results for net radiation are statistically nearly identical. Meteorological profile data from Finnish sounding stations is compiled and the inversions (the temperature of the atmosphere increases with altitude) are classified according to the total depth of the inversion and the stability of the boundary layer, which was estimated directly from the temperature gradient in the layer from the ground up to 100 meters. The persistence of the inversions and the influence of cloudiness and wind speed on the temperature gradient are also addressed. The specific problems of an urban area is tackled, using measurements from a meteorological mast situated in the Helsinki metropolitan area by comparing them to those from the radiosonde profiles at the rural site of Jokioinen. Several common schemes for the height of the stable boundary layer are compared to results from our own method developed at Finnish Meteorological Institute (FMI). Based on this analysis a modification to the FMI method is suggested. An integrated modelling system for evaluating the traffic volumes, emissions from stationary and vehicular sources, and atmospheric dispersion of pollution in an urban area is described. The dispersion modelling is based on combined application of the Urban Dispersion Modelling system for stationary sources (UDM-FMI) and the road network dispersion model (CAR-FMI). The system includes also a meteorological pre-processing model (MPP-FMI) and a statistical and graphical analysis of the computed time series of concentrations. The modelling system contains a method, which allows for the chemical interaction of pollutants, originating from a large number of urban sources. An application of the integrated modelling system for estimating the NOx and NO2 concentrations in the Helsinki metropolitan area in 1993 is presented. The thesis finally presents a comparison of model predictions with the results of an urban measurement network. en
dc.format.extent 32, [59]
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology en
dc.publisher Teknillinen korkeakoulu fi
dc.relation.ispartofseries Contributions / Finnish Meteorological Institute en
dc.relation.ispartofseries 33 en
dc.relation.haspart A. Karppinen, S.M. Joffre, P. Vaajama, Boundary layer parametrisation for Finnish regulatory dispersion models, International Journal of Environment and Pollution, 1997, 8, 557-564. [article1.pdf] © 1997 Inderscience Enterprises Ltd. By permission.
dc.relation.haspart A. Karppinen, S.M. Joffre, J. Kukkonen, The refinement of a meteorological preprocessor for the urban environment, International Journal of Environment and Pollution, 2000, 14, 565-572. [article2.pdf] © 2000 Inderscience Enterprises Ltd. By permission.
dc.relation.haspart A. Karppinen, S.M. Joffre, J. Kukkonen, P. Bremer, Evaluation of inversion strengths and mixing heights during extremely stable atmospheric stratification, International Journal of Environment and Pollution, 2001, 16 (in print). [article3.pdf] © 2001 Inderscience Enterprises Ltd. By permission.
dc.relation.haspart A. Karppinen, J. Kukkonen, T. Elolähde, M. Konttinen, T. Koskentalo, E. Rantakrans, A modelling system for predicting urban air pollution, Model description and applications in the Helsinki metropolitan area, Atmospheric Environment, 2000, 34, 3723-3733. [article4.pdf] © 2000 Elsevier Science. By permission.
dc.relation.haspart A. Karppinen, J. Kukkonen, T. Elolähde, M. Konttinen, T. Koskentalo, A modelling system for predicting urban air pollution, Comparison of model predictions with the data of an urban measurement network, Atmospheric Environment, 2000, 34, 3735-3743. [article5.pdf] © 2000 Elsevier Science. By permission.
dc.subject.other Environmental science en
dc.title Meteorological pre-processing and atmospheric dispersion modelling of urban air quality and applications in the Helsinki metropolitan area en
dc.type G5 Artikkeliväitöskirja fi
dc.description.version reviewed en
dc.contributor.department Department of Engineering Physics and Mathematics en
dc.contributor.department Teknillisen fysiikan ja matematiikan osasto fi
dc.subject.keyword meteorological preprocessor en
dc.subject.keyword urban en
dc.subject.keyword model en
dc.subject.keyword air quality en
dc.subject.keyword dispersion en
dc.subject.keyword nitrogen oxides en
dc.identifier.urn urn:nbn:fi:tkk-003135
dc.type.dcmitype text en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.type.ontasot Doctoral dissertation (article-based) en


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