Diurnal variability in the mesosphere during northern hemisphere winter

Details Diurnal variability in the mesosphere during northern hemisphere winter Diurnal variability in the mesosphere during northern hemisphere winter

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa62a0387l&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA62A-0387

Physics

3334 Middle Atmosphere Dynamics (0341, 0342)

Scientific paper

Theoretical studies indicate that nonlinear interactions between stationary waves and the migrating diurnal tide are a plausible source of nonmigrating diurnal tides in the middle atmosphere. The present study examines daily variations in stationary planetary waves and diurnal tides in the mesosphere during January-February 1979. Planetary wavenumber one is large and variable during this time, reaching peak amplitudes in the lower mesosphere between January 20-30, followed by rapid decay. This behavior is accompanied by rapid amplification of nonmigrating diurnal tides corresponding to wavenumbers zero and two, which are the sum and difference of the migrating tide and the planetary wavenumbers. Preliminary analyses indicate that the nonmigrating response is dominated by a westward traveling zonal wavenumber two at tropical latitudes, in accordance with numerical studies.

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