Responses of mesosphere and lower thermosphere temperatures to gravity wave forcing during stratospheric sudden warming

Details Responses of mesosphere and lower thermosphere temperatures to gravity wave forcing during stratospheric sudden warming Responses of mesosphere and lower thermosphere temperatures to gravity wave forcing during stratospheric sudden warming

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3709803y&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 9, CiteID L09803

Physics

3

Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Mesospheric Dynamics, Atmospheric Composition And Structure: Middle Atmosphere: Energy Deposition (3334), Atmospheric Processes: Acoustic-Gravity Waves, Atmospheric Processes: General Circulation (1223)

Scientific paper

We examine the responses of the mesosphere and lower thermosphere (MLT) temperatures to gravity waves (GWs) during stratospheric sudden warming (SSW) using TIME-GCM through modifying GW parameters. Our study confirms that the height of GW forcing region is mainly determined by GW amplitude and wavelength, and its vertical depth is closely tied to the spectral width of GW phase speed. The GW forcing controls the pattern and strength of residual circulation and thereby the characteristics of the MLT cooling and warming regions. The planetary wave (PW) forcing in the MLT also affects the vertical depth and magnitude of MLT temperature anomalies through further modifying the residual circulation. These PWs in MLT are likely generated in-situ by the GW forcing at high latitudes. Therefore, the mechanisms of GW controlling the MLT temperature during a SSW are directly through GW forcing and indirectly through generating PWs in-situ.

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