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    Original Research Papers

    Parametrization of orographic effects on surface radiation in HIRLAM

    Authors:

    A. V. Senkova,

    Russian State Hydrometeorological University, St.Petersburg, RU
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    L. Rontu ,

    Finnish Meteorological Institute, Helsinki, FI
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    H. Savijärvi

    University of Helsinki, Helsinki, FI
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    Abstract

    A parametrization scheme for orographic effects on surface radiation was introduced in the High Resolution Limited Area Model. One-kilometre resolution digital elevation data were used to derive the needed orographic parameters. The scheme is applicable within a model setup of any resolution, but is shown to significantly affect the local near-surface temperatures only when the horizontal resolution is less than a few kilometres. Then, typical maximum local differences due to the new parametrizations are 50–100 W m−2 in the net radiation fluxes and 1°–3° in the screen-level temperature. Interactions between clouds and radiation were detected both in the single-column and three-dimensional sensitivity experiments.

    How to Cite: Senkova, A.V., Rontu, L. and Savijärvi, H., 2007. Parametrization of orographic effects on surface radiation in HIRLAM. Tellus A: Dynamic Meteorology and Oceanography, 59(3), pp.279–291. DOI: http://doi.org/10.1111/j.1600-0870.2007.00235.x
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      Published on 01 Jan 2007
    Peer Reviewed
     CC BY 4.0
     Accepted on 19 Feb 2007            Submitted on 15 Aug 2006

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