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Stratospheric gravity wave simulation over Greenland during 24 January 2005
Department of Chemistry and Physics, Coastal Carolina University, Conway, South Carolina, USA
NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA
Colorado Research Associate Division, NorthWest Research Associates, Inc., Boulder, Colorado, USA
Center for Analysis and Prediction of Storms, University of Oklahoma, Norman, Oklahoma, USA
Center for Analysis and Prediction of Storms, University of Oklahoma, Norman, Oklahoma, USA
Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
Department of Computer Sciences, Coastal Carolina University, Conway, South Carolina, USA
The “Advanced Regional Prediction System” forecast model is extended up to the stratopause and over the entire hemisphere to simulate gravity waves during 24 January 2005. With a 15-km horizontal resolution, the simulation produces dominant gravity wave features near Eastern Greenland that are associated mainly with orographic forcing by the Greenland terrain. The simulated wave temperature perturbations compare favorably with radiance perturbations from NASA Atmospheric Infrared Sounder observations. In the upper stratosphere (40–50 km), vertical overturning of the isentropes suggests the occurrence of wave breaking just east of Greenland that leads to a tremendous reduction of wave amplitudes. The associated flux divergence produces horizontal flow deceleration of 12–120 m s−1 day−1 and coincides with areas of depleted stratospheric wind speed, suggesting strong interactions between orographic gravity waves and the polar vortex. A simulation using the coarser 50-km horizontal resolution produces gravity waves of significantly weaker amplitudes.
Received 24 July 2006; accepted 14 February 2007; published 24 May 2007.
Citation: (2007), Stratospheric gravity wave simulation over Greenland during 24 January 2005, J. Geophys. Res., 112, D10115, doi:10.1029/2006JD007823.
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