Non-migrating diurnal tides generated with planetary waves in the Mesosphere

Details Non-migrating diurnal tides generated with planetary waves in the Mesosphere Non-migrating diurnal tides generated with planetary waves in the Mesosphere

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30pasc3m&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 16, pp. ASC 3-1, CiteID 1832, DOI 10.1029/2003GL017877

Physics

9

Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics (0341, 0342), Meteorology And Atmospheric Dynamics: Theoretical Modeling, Meteorology And Atmospheric Dynamics: Waves And Tides

Scientific paper

We report results from our Numerical Spectral Model (NSM) that incorporates Hines' parameterization for small-scale gravity waves (GW). The NSM generates non-migrating tides in the mesosphere having amplitudes comparable to those observed, and we demonstrate that they arise from interactions between migrating tides and planetary waves (PW). We examine this mechanism for the large m = 0 diurnal tide, which was proposed to be generated with m = 1 PWs. The NSM is run for comparison without the zonal mean heat source, which suppresses the PWs that normally are excited by instabilities. The resulting amplitudes of the stationary tide are then negligibly small. When the time dependent GW momentum source for m = 0 is turned off, the stationary tide is significantly reduced. This indicates that, in the NSM, GWs play an important role in generating the nonlinear interactions between migrating tides and PWs that are necessary to produce the non-migrating tides.

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