Observation of low frequency Kelvin waves in the mesosphere

Details Observation of low frequency Kelvin waves in the mesosphere Observation of low frequency Kelvin waves in the mesosphere

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ep%26s...51..649s&link_type=abstract

Earth, Planets and Space, Volume 51, p. 649-656.

Physics

2

Scientific paper

This paper presents evidence for a quasi-stationary Kelvin wave of zonal wavenumber 1 that is forced in situ in the upper mesosphere and propagates upward from there. Although large scale quasi-stationary longitudinal variations are common in the mesopause equatorial winds, these variations often do not have a structure associated with a vertically propagating mode. However, during the periods of easterly winds that occur near the equinoxes in association with the mesopause semi-annual oscillation (MSAO), a Kelvin wave propagates away from the presumed altitude of forcing. The momentum transport by the Kelvin wave is small and does not make a significant contribution to the SAO wind evolution.

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