Global-scale tidal variability during the PSMOS campaign of June-August 1999: interaction with planetary waves

Details Global-scale tidal variability during the PSMOS campaign of June-August 1999: interaction with planetary waves Global-scale tidal variability during the PSMOS campaign of June-August 1999: interaction with planetary waves

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jastp..64.1865p&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 64, Issue 17, p. 1865-1896.

Physics

18

Scientific paper

During the PSMOS Global-scale tidal variability experiment campaign of June 1-August 31, 1999, a network of radars made measurements of winds, waves and tides in the mesosphere/lower-thermosphere region over a wide range of latitudes. Clear evidence was found that fluctuations in tidal amplitudes occur on a global scale in both hemispheres, and that at least some of these fluctuations are periodic in nature. Modulation of the amplitude of the 12h tide was particularly evident at periods of 10 and 16 days, suggesting a non-linear interaction with planetary waves of those periods to be responsible. In selected cases, the secondary waves predicted from non-linear theory could be identified and their zonal wave numbers determined. In some, but not all, cases the longitudinal structure of the secondary waves supports the theory of planetary-wave/tidal interaction being responsible for the observed tidal modulation. It was noted also that beating between a 12.4-lunar and the solar tide could produce a near 16-day modulation of the 12h tide amplitude that is frequently observed in late summer.

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