A Method of Removing Lamb Waves from Initial Data for Primitive Equation Models

Warren M. Washington National Center for Atmospheric Research, Boulder, Colo. 80303

Search for other papers by Warren M. Washington in
Current site
Google Scholar
PubMed
Close
and
David P. Baumhefner National Center for Atmospheric Research, Boulder, Colo. 80303

Search for other papers by David P. Baumhefner in
Current site
Google Scholar
PubMed
Close
Restricted access

Abstract

A simple method of reducing the amplitude of Lamb waves in primitive equation model forecasts has been proposed and tested. This method makes use of a Boussinesq-type approximation in which the vertical mean mass divergence is set equal to zero. It effectively reduces the Lamb waves by a factor of 3 in the example shown here and does not degrade the forecast accuracy. The largest reduction in Lamb wave amplitude is found in the tropical regions.

Abstract

A simple method of reducing the amplitude of Lamb waves in primitive equation model forecasts has been proposed and tested. This method makes use of a Boussinesq-type approximation in which the vertical mean mass divergence is set equal to zero. It effectively reduces the Lamb waves by a factor of 3 in the example shown here and does not degrade the forecast accuracy. The largest reduction in Lamb wave amplitude is found in the tropical regions.

Save