Initial results of diurnal tide at Wuhan (114.4^oE,30.6^oN) using Canonical Correlation Analysis
Abstract
In this paper we use Canonical Correlation Analysis CCA method to investigate the mesosphere and low thermosphere MLT diurnal tidal winds during the year 2002 observed by a newly installed meteor radar at Wuhan 114 4 oE 30 6 oN Over a pair of typical heights analyzed by CCA 6 effective tidal modes representing over 90 total variance of the input wind components are extracted Initial result shows that the 1st mode and 2nd mode are related to the annual and semi-annual variations and 3rd and 4th mode may be affected by the modulations of solar 27-day rotation and the 16-day planetary wave oscillation respectively Among the all modes 1st mode is the most notable which represents over 40 of total variance and the re-constructed diurnal tidal wind pattern using 1st mode tends to show maximum amplitudes in spring and autumn as well as a sudden phase transit near equinox month According to the variations of tidal phases at a pair of analyzed heights the vertical wavelengths are near 30km for all the 6 re-constructed diurnal tidal patterns these suggested the classic tide mode S 1 1 may be dominant mode in diurnal tide
- Publication:
-
36th COSPAR Scientific Assembly
- Pub Date:
- 2006
- Bibcode:
- 2006cosp...36.2618X