Quasi-biennial modulation of the semidiurnal tide in the upper mesosphere above Halley, Antarctica

Details Quasi-biennial modulation of the semidiurnal tide in the upper mesosphere above Halley, Antarctica Quasi-biennial modulation of the semidiurnal tide in the upper mesosphere above Halley, Antarctica

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3421804h&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 21, CiteID L21804

Mathematics

Logic

12

Atmospheric Processes: Tides And Planetary Waves, Atmospheric Processes: Mesospheric Dynamics, Geographic Location: Antarctica (4207)

Scientific paper

We present an analysis of a long-term archive of horizontal wind data derived from meteor wind observations from a SuperDARN radar at Halley, Antarctica (76°S, 27°W). Systematic differences between the 12-hour component in the meridional wind and the climatological mean are observed showing evidence of a quasi-biennial modulation of the high-latitude semidiurnal tide in the upper mesosphere. The amplitude of the observed tides is enhanced when the equatorial stratospheric quasi-biennial oscillation above 10 hPa is westerly. This enhancement is greatest in the summertime tidal amplitudes when the zonal wavenumber one (S = 1) non-migrating component dominates the semidiurnal wind field, and is coincident with an enhancement of the summertime planetary wave activity in the upper mesosphere. These observations strongly support the hypothesis that the S = 1 component of the semidiurnal tide observed at high latitudes is due to a non-linear interaction between the migrating S = 2 semidiurnal tide and quasi-stationary S = 1 planetary waves.

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