Schlüsselwörter
(Englisch)
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Air pollution modelling; particle dispersion model; turbulence parameterisation
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Forschungsprogramme
(Englisch)
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COST-Action 728 - Enhancing meso-scale meteorological modelling capabilities for air pollution and dispersion applications
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Kurzbeschreibung
(Englisch)
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An off-line integrated system of the Swiss operational numerical weather prediction models, the Alpine Model (aLMo) and its high-resolution version aLMo2, and a Lagrangian particle dispersion model will be devised. An interface between the meteorological models and the dispersion model will be implemented, which accounts for subgrid-scale effects such as surface fluxes of momentum, heat, and moisture, turbulence, shallow and deep convection, radiation, and gravity waves. Parameterisations will be tested for their suitability for the complex topography of the Alpine region and the appropriate aggregation of the sub-gridscale parameters to the grid of the dispersion model will be investigated. The evaluation and validation of the modelling system will be done with concentration time series from Switzerland. With this interface, the operational aLMo model can be employed as driving model for air pollution modelling, and several years of existing aLMo archive data can be used.
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Weitere Hinweise und Angaben
(Englisch)
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Full name of research-institution/enterprise: Bundesamt für Meteorologie und Klimatologie MeteoSchweiz
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Partner und Internationale Organisationen
(Englisch)
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AT, BE, BG, CH, CY, DE, DK, EE, ES, FI, FR, GR, HU, IT, LT, NL, NO, PL, PT, RO, SE, TR, UK
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Abstract
(Englisch)
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After detailed investigation of different available methods for the determination of the planetary boundary layer (PBL) height, the bulk Richardson number was chosen as the most reliable method in an operational NWP setting. This method was implemented in the official code of the COSMO model and is calculated operationally since May 2009 at MeteoSwiss. A new scaling approach from Weigel et al. (2007) suited for steep and narrow Alpine valleys was investigated with respect to pollutant dispersion (Szintai et al., 2010). The new approach was tested on the TRANSALP-89 tracer experiment which was conducted in highly complex terrain in southern Switzerland. The sensitivity of the modelling system towards the soil moisture, horizontal grid resolution, and boundary layer height determination was investigated. It was shown that if the flow field is correctly reproduced the new scaling approach improves the tracer concentration simulation, when compared to the classical coupling methods. Until recently the testing of the COSMO turbulence scheme was restricted to unstable cases in this PhD work. To get an unbiased picture from the scheme, a stable case study has also been investigated. For this, the GABLS-3 case was chosen, which covers the simulation of a whole stable night on the location of the Cabauw tower with the single column version of COSMO.
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Datenbankreferenzen
(Englisch)
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Swiss Database: COST-DB of the State Secretariat for Education and Research Hallwylstrasse 4 CH-3003 Berne, Switzerland Tel. +41 31 322 74 82 Swiss Project-Number: C05.0138
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