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Original Research Papers

Effects of hydrostatic approximation and resolution on the simulation of convective adjustment

Authors:

David Dietrich,

Center for Air Sea Technology, Mississippi State University, Stennis Space Center, Mississippi, US
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Charles A. Lin

Department of Atmospheric and Oceanic Sciences, and Centre for Climate and Global Change Research (C2GCR), McGill University, and Centre de recherche en calcul appliqué, (CERCA), Montreal, Quebec, CA
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Abstract

A two-dimensional non-hydrostatic ocean model and a hydrostatic version of the same modelare used to simulate convective adjustment, without the use of an instantaneous adjustment parameterization. The model geometry is a domain on the vertical plane of width 40 km and depth 500 m. Model results for four cases are examined: hydrostatic and non-hydrostatic, at 0.1 and 1 km spatial resolution. The convectively adjusted stable state obtained in all four cases are qualitatively similar; thus the hydrostatic approximation does not eliminate convective adjustment. The details of the simulated convective plumes depend on resolution and whether the hydrostatic approximation is made. The adjusted state has significant stratification which cannot be captured by the conventional instantaneous adjustment or diffusion-based parameterizations. We also compare the results to the case when an instantaneous adjustment parameterization is used.

How to Cite: Dietrich, D. and Lin, C.A., 2002. Effects of hydrostatic approximation and resolution on the simulation of convective adjustment. Tellus A: Dynamic Meteorology and Oceanography, 54(1), pp.34–43. DOI: http://doi.org/10.3402/tellusa.v54i1.12119
  Published on 01 Jan 2002
 Accepted on 20 Sep 2001            Submitted on 27 Dec 1999

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