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1 JUNE 2002 1805B E R E S E T A L . 2002 American Meteorological Society
 

Summary: 1 JUNE 2002 1805B E R E S E T A L .
2002 American Meteorological Society
Effects of Tropospheric Wind Shear on the Spectrum of Convectively Generated
Gravity Waves
JADWIGA H. BERES
University of Washington, Seattle, Washington
M. JOAN ALEXANDER
Colorado Research Associates, Boulder, Colorado
JAMES R. HOLTON
University of Washington, Seattle, Washington
(Manuscript received 22 May 2000, in final form 25 October 2001)
ABSTRACT
The authors examine the effects of tropospheric wind shear on the phase speed spectrum of gravity waves
generated by tropical convection. A two-dimensional cloud-resolving model is used to perform numerous squall
line simulations with the vertical shear of the horizontal wind varied in three layers of the troposphere. Several
simplified simulations using prescribed heating are also performed to elucidate the interactions of wind shear
with thermal forcing. It is found that the dominant phase speed range of convectively generated stratospheric
gravity waves is primarily determined by the vertical scale of the tropospheric heating and is then modified by
the tropospheric wind. The gravity wave spectrum is especially sensitive to shear in the upper troposphere.
Through a mechanism similar to critical level filtering, such shear acts to reduce the momentum flux of waves

  

Source: Alexander, M. Joan - Colorado Research Associates Division, Northwest Research Associates, Inc.

 

Collections: Geosciences