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A Model Study of Gravity Waves over Hurricane Humberto (2001) M. A. KUESTER
 

Summary: A Model Study of Gravity Waves over Hurricane Humberto (2001)
M. A. KUESTER
National Ecological Observatory Network, Inc., Boulder, Colorado
M. J. ALEXANDER
Colorado Research Associates Division, NWRA, Boulder, Colorado
E. A. RAY
Chemical Sciences Division, NOAA/Earth Systems Research Laboratory, and CIRES, University of Colorado, Boulder, Colorado
(Manuscript received 12 December 2006, in final form 11 February 2008)
ABSTRACT
Atmospheric gravity waves are known to influence global circulations. Understanding these waves and
their sources help to develop parameterizations that include their effects in climate and weather forecasting
models. Deep convection is believed to be a major source for these waves and hurricanes may be particu-
larly intense sources. Simulations of Hurricane Humberto (2001) are studied using the fifth-generation
Pennsylvania State University­National Center for Atmospheric Research (PSU­NCAR) Mesoscale Model
(MM5). Humberto is simulated at both tropical storm and hurricane stages. Fourier transform and wavelet
analysis are employed to investigate wave characteristics and their behavior in the lower stratosphere. The
Fourier analysis gives a regional view of storm affects, whereas wavelet analysis gives a local picture of
isolated events. Analysis of the movement of convective sources and local winds gives further insight into
the mechanisms that can cause gravity waves. Convectively generated gravity waves are observed in the
lower stratosphere of this model with horizontal scales of 15­300 km, vertical scales of 4­8 km, and intrinsic

  

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

 

Collections: Geosciences