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Phase relationships between tidal horizontal wind components observed in the mid-latitude winter upper mesosphere
Liu, R. L.; Lu, D. R.; Xu JY(徐寄遥); Hu X(胡雄); 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationJournal of Atmospheric and Solar-Terrestrial Physics
2008
Volume70Issue:1Pages:40190
ISSN1364-6826
Language英语
KeywordTide Tidal Phase Phase Coupling Upper Mesosphere Migrating Solar Tides Mf Radar Observations Lower Thermosphere Atmospheric Tides Terdiurnal Tide Nonlinear-interactions Middle Atmosphere Semidiurnal Tide Diurnal Tide Mean Wind
AbstractWind measurements obtained from the Wuhan/China MF radar during winter 2001 are used to study the phase relationships between tidal horizontal winds in the upper mesosphere. The tidal initial phases in any time window are uniformly defined in radians. The meridional and zonal initial phases of each tide exhibit similar time variation trends at each height, which is associated with near tidal horizontal phase differences at three continuous heights. However, different tides have different phase variation trends and phase differences. Tidal meridional components generally lead the zonal. The domains of tidal phase 'quasi-quadrature' and 'quasi-in-phase' are strictly specified. In most of similar to 14 days, the diurnal (Delta phi(24)) and sernidiurnal (Delta phi(12)) phase differences are 'quasi-quadrature' while the terdiurnal phase difference (Delta phi(8)) is surprisingly 'quasi-in-phase'. The appropriate tidal meridional and zonal quadratic phase coupling (QPC) equations are estimated, respectively. The calculated terdiurnal phases and those observed agree well. The tidal phases calculated by discrete Fourier transform (DFT) and least-squares fitting (LSF) are equivalent as are the tidal QPC revealed, respectively, by bicoherence spectrum and LSF analyses. By subtracting the estimated tidal zonal QPC equation from the meridional, a tidal phase difference equation is obtained. The calculated terdiurnal phase differences and those observed again agree with each other. Within the 14th time window, all three tides are generally elliptically rather than circularly or linearly polarized. However, both Delta phi(24) and Delta phi(12) in this window are 'quasi-quadrature' at all heights while Delta phi(8) are 'quasi-in-phase' at 92.0 and 94.0 km. So the estimated tidal QPC equations, the deduced tidal phase difference equation, the observed terdiurnal,quasi-in-phase' phase differences and the typical tidal polarization plots are all indications of real QPC between the observed 24-, 12- and 8-h tides.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1094
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Liu, R. L.,Lu, D. R.,Xu JY,et al. Phase relationships between tidal horizontal wind components observed in the mid-latitude winter upper mesosphere[J]. Journal of Atmospheric and Solar-Terrestrial Physics,2008,70(1):40190.
APA Liu, R. L.,Lu, D. R.,徐寄遥,胡雄,&北京8701信箱.(2008).Phase relationships between tidal horizontal wind components observed in the mid-latitude winter upper mesosphere.Journal of Atmospheric and Solar-Terrestrial Physics,70(1),40190.
MLA Liu, R. L.,et al."Phase relationships between tidal horizontal wind components observed in the mid-latitude winter upper mesosphere".Journal of Atmospheric and Solar-Terrestrial Physics 70.1(2008):40190.
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