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Validation of parameterized convective fluxes with DIAMOD

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Summary

A diagnostic model (DIAMOD) for the atmosphere over Europe is use at the University of Vienna. Central parameters in each diagnostic column (horizontal resolution 100 km, time resolution 12 hours) are the vertical moisture plus heat flux (the total convective heat fluxh) and the vertical rain flux (r); both are functions of pressure. In this study DIAMOD is applied to validate the output of a forecast model for the simulation of acid deposition (EURAD) which is in use at the University of Cologne. The basic equations of both DIAMOD and EURAD models are summarized with emphasis on the sub-gridscale hydrologic components.

First, the nontrivial problem of validating model output versus observations is discussed. Two different validation techniques based upon the budget equations are indentified. The fully prognostic technique compares the forecast of EURAD for the total verification period with the corresponding DIAMOD output. The semiprognostic validation technique involves only one-time-step tendencies. Neither yields an exact correspondence between EURAD and DIAMOD; however, the semiprognostic technique comes somewhat closer to the ideal of an objective validation. The quantities investigated are: The fields, the time tendencies and the fluxesh andr.

Second, EURAD is validated versus DIAMOD with both techniques for the EUMAC Joint Wet Case (the Chernobyl episode) in April 1986; the output fields include selected profiles ofh(p) over France (a moist night situation) and over Greece (a dry day situation). The comparison demonstrates for both that the EURAD forecasts are acceptable for ther-fluxes but are relatively poor for theh-fluxes. Reasons for the differences are discussed.

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Author notes

  1. M. Hantel & Y. Wang

    Present address: Institut für Meteorologie und Geophysik, Universität Wien, Hohe Warte 38, A-1190, Wien, Austria

  2. H. -J. Jakobs

    Present address: Institut für Geophysik und Meteorologie, Universität zu Köln, EURAD, D-50931, Köln, Federal Republic of Germany

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    1. M. Hantel
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    2. H. -J. Jakobs
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    3. Y. Wang
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    Hantel, M., Jakobs, H.J. & Wang, Y. Validation of parameterized convective fluxes with DIAMOD. Meteorl. Atmos. Phys. 57, 201–227 (1995). https://doi.org/10.1007/BF01044161

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