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Original Research Papers

Gravity wave drag and global angular momentum: geostrophic adjustment processes

Author:

Joseph Egger

Meteorologisches Institut, Universität München, Theresienstrasse 37, 80333 Munich, DE
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Abstract

Current gravity wave drag schemes alter the flow field of a numerical model by changing the velocity.It is argued that this is essentially the situation considered in the theory of geostrophic adjustment.The reduction of velocity at one moment does not necessarily lead to a reduction of the global meanvelocity after adjustment in that case. It is best to discuss these processes in terms of angular momentumconservation, so that the initial loss of velocity can be seen as a reduction of the wind term which maybe converted into a reduction of the mass term. Observations are used to see if this process can bedetected in the angular momentum budget of the atmosphere. The data indeed reveal a rapid positiveresponse of the mass term to the gravity wave drag.

How to Cite: Egger, J., 2003. Gravity wave drag and global angular momentum: geostrophic adjustment processes. Tellus A: Dynamic Meteorology and Oceanography, 55(5), pp.419–425. DOI: http://doi.org/10.3402/tellusa.v55i5.12105
  Published on 01 Jan 2003
 Accepted on 14 Mar 2003            Submitted on 24 May 2002

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