On the origins of mesospheric gravity waves

Details On the origins of mesospheric gravity waves On the origins of mesospheric gravity waves

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3619801s&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 19, CiteID L19801

Physics

12

Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Acoustic-Gravity Waves, Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Processes: Mesospheric Dynamics, Atmospheric Composition And Structure: Middle Atmosphere: Energy Deposition (3334)

Scientific paper

Using hourly data from a three-year simulation based on a gravity-wave resolving general circulation model, we have first inferred a global view of gravity wave sources and propagation affecting significantly the momentum balance in the mesosphere. The meridional cross section of momentum fluxes suggests that there are a few dominant propagation paths originating from the subtropics in summer and the middle to high latitudes in winter. These gravity waves are focused into the mesospheric jets in their respective seasons, acting effectively to decelerate the jets. The difference in the source latitudes likely contributes to the hemispheric asymmetries of the jets. The horizontal distribution of the momentum fluxes indicates that the dominant sources are steep mountains and tropospheric westerly jets in winter and vigorous monsoon convection in summer. The monsoon regions are the most important window to the middle atmosphere in summer because of the easterlies associated with the monsoon circulation.

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