dc.contributor.author | Grønskei, Knut Erik | |
dc.contributor.author | Gram, Frederick | |
dc.contributor.author | Larssen, Steinar | |
dc.contributor.author | Walker, Sam-Erik | |
dc.date.accessioned | 2020-12-11T12:52:41Z | |
dc.date.available | 2020-12-11T12:52:41Z | |
dc.date.issued | 2000 | |
dc.identifier.isbn | 82-425-1225-6 | |
dc.identifier.issn | 0807-7207 | |
dc.identifier.uri | https://hdl.handle.net/11250/2717189 | |
dc.description.abstract | Hourly data on emission, wind and dispersion conditions are used to calculate hourly NOx-concentrations in a 1 km grid system based on a time dependent finite difference dispersion model in three levels. The pollution contribution from roads and point sources are accounted for by a subgrid model based on Gaussian line source and point source models. Results of concentration calculations are evaluated by using data from eight stations for three winter months (1.11.91-29.2.92) and from the three main stations for two summer months (1.5.-30.6.92). The relative importance of the prosesses affecting the NO2-concentrations in an urban area as a function of advection time from a line source are discussed. A balance between NO, NO2 and O3 is found when the advection time is larger than 600-1000 s. The high NO2-concentrations occur when the O3-concentrations are very low. | |
dc.language.iso | eng | |
dc.publisher | NILU | |
dc.relation.ispartof | NILU OR | |
dc.relation.ispartofseries | NILU OR; 57/2000 | |
dc.subject | Nitrogenoksider | |
dc.subject | Spredning | |
dc.subject | By- og trafikkforurensning | |
dc.title | Evaluation of urban scale time-dependent dispersion model with subgrid elements, in Oslo, Norway. | |
dc.type | Research report | |
dc.rights.holder | © NILU | |
dc.source.issue | 57/2000 | |
dc.relation.project | NILU:91029 | |