Geosci. Model Dev. Discuss., 5, 3733-3769, 2012
www.geosci-model-dev-discuss.net/5/3733/2012/
doi:10.5194/gmdd-5-3733-2012
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This discussion paper has been under review for the journal Geoscientific Model Development (GMD). Please refer to the corresponding final paper in GMD.
A mass conserving and multi-tracer efficient transport scheme in the online integrated Enviro-HIRLAM model
B. Sørensen1, E. Kaas1, and U. S. Korsholm2
1Niels Bohr Institute, University of Copenhagen, Denmark
2Danish Meteorological Institute, Denmark

Abstract. In this paper a new advection scheme for the online coupled chemical-weather prediction model Enviro-HIRLAM is presented. The new scheme is based on the locally mass conserving semi-Lagrangian method (LMCSL), where the original two-dimensional scheme has been extended to a fully three-dimensional version. This means that the three-dimensional semi-implicit semi-Lagrangian scheme which is currently used in Enviro-HIRLAM, is largely unchanged. The HIRLAM model is a computationally efficient hydrostatic operational short term numerical weather prediction model, which is used as the base for the online integrated Enviro-HIRLAM. The new scheme is shown to be efficient, mass conserving, and shape-preserving while only requiring minor alterations to the original code. It still retains the stability at long time steps, which the semi-Lagrangian schemes are known for, while handling the emissions of chemical species accurately. Several mass conserving filters have been tested to assess the optimal balance of accuracy vs. efficiency.

Citation: Sørensen, B., Kaas, E., and Korsholm, U. S.: A mass conserving and multi-tracer efficient transport scheme in the online integrated Enviro-HIRLAM model, Geosci. Model Dev. Discuss., 5, 3733-3769, doi:10.5194/gmdd-5-3733-2012, 2012.
 
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