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Generation and Trapping of Gravity Waves from Convection with Comparison to Parameterization
 

Summary: Generation and Trapping of Gravity Waves from Convection with
Comparison to Parameterization
M. JOAN ALEXANDER
Colorado Research Associates Division, NorthWest Research Associates, Boulder, Colorado
JADWIGA H. (BERES) RICHTER
National Center for Atmospheric Research, Boulder, Colorado
BRUCE R. SUTHERLAND
University of Alberta, Edmonton, Alberta, Canada
(Manuscript received 3 June 2005, in final form 21 March 2006)
ABSTRACT
Some parameterizations of gravity wave mean flow forcing in global circulation models (GCMs) add
realism by describing wave generation by tropospheric convection. Because the convection in GCMs is itself
a parameterized process, these convectively generated wave parameterizations necessarily use many sim-
plifying assumptions. In this work, the authors use a realistic simulation of wave generation by convection
described in previous work, which was validated by observations from the Darwin Area Wave Experiment
(DAWEX), to test these assumptions and to suggest some possible improvements to the parameterizations.
In particular, the authors find that wave trapping in the troposphere significantly modifies the spectrum of
vertically propagating waves entering the stratosphere above convective wave sources, and offer a linear
method for computing wave transmission and reflection effects on the spectrum suitable for inclusion in the
parameterizations. The wave fluxes originate from both a time-varying heating mechanism and an obstacle

  

Source: Alexander, M. Joan - Colorado Research Associates Division, Northwest Research Associates, Inc.
Sutherland, Bruce - Department of Mathematical and Statistical Sciences, University of Alberta

 

Collections: Geosciences; Mathematics