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  • 1.
    Häggkvist, Kenneth
    SMHI, Affärsverksamhet.
    Evaluation of dispersion models for an urban environment: an example from Stockholm, Sweden1997Ingår i: International Journal of Environment and Pollution, ISSN 0957-4352, E-ISSN 1741-5101, Vol. 8, nr 3-6, s. 638-645Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    An air quality management system has been in operational use in the city of Stockholm, Sweden, for several years. In the system there are, in addition to databases for measurements of air pollution and meteorological parameters and emission data, several dispersion models. The models include a Gaussian and a Eulerian (grid) type of dispersion model. An evaluation of the Gaussian and the grid models for Stockholm has been carried out. Simulated concentrations of nitrogen oxides, NOx, have been compared with measured NOx concentrations at three measuring stations in central parts of the city. The evaluation was based on comparisons between measured and simulated concentrations in two time-series, a summer week and a winter week, and between two seasonal simulations, a summer and a winter seasonal average and extreme concentrations. It was noted that the mean difference between the measured and the simulated concentrations during all trials varied from a few percent up to 60%. It was also noted that the differences for the seasonal averages and 98-percentile decreased considerably when the simulated value was picked from the gridpoint with best agreement with the measured value, inside a circle with a radius of one grid distance from the measuring station.

  • 2. Kovalets, Ivan V.
    et al.
    Robertson, Lennart
    SMHI, Forskningsavdelningen, Luftmiljö.
    Persson, Christer
    SMHI, Forskningsavdelningen, Luftmiljö.
    Didkivska, Svitlana N.
    Ievdin, Ievgen A.
    Trybushnyi, Dmytro
    Calculation of the far range atmospheric transport of radionuclides after the Fukushima accident with the atmospheric dispersion model MATCH of the JRODOS system2014Ingår i: International Journal of Environment and Pollution, ISSN 0957-4352, E-ISSN 1741-5101, Vol. 54, nr 2-4, s. 101-109Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The paper presents estimates of the far-range atmospheric dispersion of radionuclides after the accident at Fukushima Daiichi Nuclear Power Plant (NPP), obtained using the long-range atmospheric dispersion model MATCH. Software tools were developed to run MATCH in the EU nuclear emergency response system JRODOS using freely available numerical weather prediction (NWP) data of the Global Forecasting System (GFS) operated by the United States National Center of Environmental Prediction (NCEP). Comparisons are made of results with JRODOS/MATCH and a standalone MATCH operated by Swedish Meteorological and Hydrological Institute (SMHI) driven by the European Center for Medium-Range Weather Forecasts (ECMWF) NWP data.

  • 3. Pechinger, U
    et al.
    Dittmann, E
    Erbes, G
    Johansson, P
    Karppinen, A
    Musson-Genon, L
    Omstedt, Gunnar
    SMHI, Forskningsavdelningen, Luftmiljö.
    Tercier, P
    Intercomparison of methods for parameterizing components of the surface energy balance - a summary of Working Group 1 - COST 710 results2000Ingår i: International Journal of Environment and Pollution, ISSN 0957-4352, E-ISSN 1741-5101, Vol. 14, nr 1-6, s. 558-564Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Working Group 1 of COST Action 710 investigated the use of meteorological pre-processors for short-range dispersion models for regulatory purposes. Two commonly used schemes for estimating boundary-layer fluxes from standard meteorological observations were intercompared using high latitude measurements from Sweden for spring/summer and winter conditions. Ground heat fluxes estimated with five different schemes were compared for data measured in Switzerland. The main results of these studies are presented.

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