Diurnal tides in mesosphere/low-thermosphere during 2002 at Wuhan (30.6°N, 114.4°E) using canonical correlation analysis

Details Diurnal tides in mesosphere/low-thermosphere during 2002 at Wuhan (30.6°N, 114.4°E) using canonical correlation analysis Diurnal tides in mesosphere/low-thermosphere during 2002 at Wuhan (30.6°N, 114.4°E) using canonical correlation analysis

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgrd..11206104x&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue D6, CiteID D06104

Physics

1

Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Tides And Planetary Waves, Atmospheric Processes: Instruments And Techniques

Scientific paper

In this paper, we use canonical correlation analysis (CCA) method to investigate the mesosphere/low thermosphere (MLT) diurnal tidal winds during the year 2002 observed by a newly installed meteor radar at Wuhan (30.6°N, 114.4°E). In general, six effective diurnal tidal pairs of patterns are obtained, which represent over 90% total variances of the origin data set. These patterns are expected to correspond to the atmospheric oscillations within diurnal frequency band excited or modulated by different sources, namely, the seasonal variations and the modulations by semiannual-like variations, solar 27-day rotation and the planetary wave oscillations. Among all of the patterns, the first pattern is the most notable, which represents ~40% of total variances. Its amplitudes show maximum values in spring and autumn as well as sudden phase transit near equinox month, which is in line with the results obtained from traditional harmonic analysis. The vertical wavelengths (~30 km) suggest the classic tidal mode S(1,1) is dominant, and the preceding phases (~5-6 hours) of the meridional components of the diurnal tidal wind show right-rotating circular polarization may be the main characteristic in tidal wind.

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