Climatology and variability of the semidiurnal tide in the lower thermosphere over Millstone Hill

Details Climatology and variability of the semidiurnal tide in the lower thermosphere over Millstone Hill Climatology and variability of the semidiurnal tide in the lower thermosphere over Millstone Hill

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jgr...10320715g&link_type=abstract

Journal of Geophysical Research, Volume 103, Issue A9, p. 20715-20726

Mathematics

Logic

18

Meteorology And Atmospheric Dynamics: Waves And Tides, Meteorology And Atmospheric Dynamics: Thermospheric Dynamics

Scientific paper

Data obtained by the Millstone Hill incoherent scatter radar during Lower Thermosphere Coupling Study campaigns in 1987-1997 were analyzed in order to determine the characteristics of the semidiurnal variations in horizontal neutral winds and temperatures at midlatitudes in the altitude range of 95-130 km. We present altitude profiles of amplitude and phase of the semidiurnal variations for climatological mean data, seasonally averaged data, as well as individual multiday campaigns. The climatologically mean semidiurnal amplitude attains ~50m/s for eastward wind, ~35m/s for the northward wind, and ~27 K for the temperature. At most altitudes, the standard deviation is 50-70% of the magnitude of the climatological mean value, and a large part of the observed variability is due to seasonal differences. The strongest semidiurnal oscillations are found for equinox and summer winds, reaching 80-90 m/s, while winter amplitudes are generally smaller. Summer winds are characterized by a consistent pattern in amplitude and phase; however, winter winds are more variable from campaign to campaign. Similarly, temperatures reveal low variability in phase for the summer season and high variability in winter, but the amplitudes of the 12-hour oscillations in temperature are variable for all seasons. Comparison with other experimental data suggests good agreement in general but larger variability. We discuss the possible sources of the observed variability and link it to processes in the mesosphere.

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