Non-linear interactions between tides and planetary waves resulting in periodic tidal variability

Beard, A. G.; Mitchell, N. J.; Williams, P. J. S.; Kunitake, Manabu

doi:10.1016/s1364-6826(99)00003-6

Cited by 139 publications

(176 citation statements)

References 38 publications

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“…Many investigations (Teitelbaum and Vial, 1991;Hall et al, 1995;Mitchell et al, 1996;Beard et al, 1997Beard et al, , 1999Beard et al, , 2001Mayr et al, 2005a, b) have verified that there indeed exists coupling between PWs and tides. The generation of secondary waves and the modulated tide by PWs are usually taken as two indications for the PW/tide coupling.…”

Section: Pw/diurnal Tide Couplingmentioning

confidence: 97%

Intensive radiosonde observations of the diurnal tide and planetary waves in the lower atmosphere over Yichang (111°18' E, 30°42' N), China

Huang

Zhang

2009

Ann. Geophys.

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Abstract. The characteristics of diurnal tide and planetary waves (PWs) in the troposphere and lower stratosphere (TLS) over Yichang (111 • 18 E, 30 • 42 N) were studied by using the data from intensive radiosonde observations in August 2006 (summer month) and January 2007 (winter month) on an eight-times-daily basis. The radiosonde observations of the diurnal tide and PWs in the TLS in the mid-latitudes have seldom been reported. We find that there exists dominant diurnal oscillations in the TLS over Yichang. The observed diurnal tide consists of significant nonmigrating components, which may be owning to the local latent heat release. Since the nonmigrating tides are usually composed of high order modes with smaller vertical wavelengths, which are prone to dissipation in comparison with the low order modes, the observational tidal amplitudes decrease sharply at several heights. Some evident discrepancies between the observations and the GSWM-02 are found, which may result mainly from the inaccurate prediction of the nonmigrating tidal components by the GSWM-02. And, due to the evident seasonal differences of the water vapor mixing ratio disturbance and the tropospheric jet induced turbulence in winter, the diurnal tides in the summer and winter months have some different characteristics. Besides the diurnal tide, obvious quasi 7-day PW (QSDPW) and quasi 10-day PW (QTDPW) are also recognized from our observations in both the summer and winter months. The QSDPWs in the troposphere in both the summer and winter months show a standing wave structure, while the QTDPWs generally exhibit traveling wave characteristics. Spectral analyses reveal that some waves with periods around that of the diurnal tide Correspondence to: S. D. Zhang (zsd@whu.edu.cn) are generated due to the interactions of the diurnal tide and PWs and the tidal amplitudes are modulated by the PWs, indicating the extensive coupling between the diurnal tide and PWs. Moreover, our observations manifest that the PWs can exert great impacts on the tropospheric jet in winter and the tropopause in both the summer and winter months.

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Section: Pw/diurnal Tide Couplingmentioning

confidence: 97%

Intensive radiosonde observations of the diurnal tide and planetary waves in the lower atmosphere over Yichang (111°18' E, 30°42' N), China

Huang

Zhang

2009

Ann. Geophys.

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“…Because planetary waves have much lower frequencies than the tides, these secondary waves have frequencies near tidal frequencies and may beat with the tide, modulating the tidal amplitude at the planetary-wave period (e.g. Teitelbaum and Vial, 1991;RuÈ ster 1992RuÈ ster , 1994Mitchell et al, 1996;Clark and Bergin, 1997;Kamalabadi et al, 1997;Beard et al, 1999a;Pancheva, 2000). Other studies have recently suggested that similar interactions may also occur between di erent members of the planetary-wave ®eld (Jacobi et al, 1998;.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of winds and tidal variability in the mesosphere/lower-thermosphere region over Bulgaria and the UK

Pancheva

Mukhtarov

Mitchell

et al. 2000

Annales Geophysicae

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Abstract. Meteor radars located in Bulgaria and the UK have been used to simultaneously measure winds in the mesosphere/lower-thermosphere region near 42.5°N, 26.6°E and 54.5°N, 3.9°W, respectively, over the period January 1991 to June 1992. The data have been used to investigate planetary waves and diurnal and semidiurnal tidal variability over the two sites. The tidal amplitudes at each site exhibit¯uctuations as large as 300% on time scales from a few days to the intra-seasonal, with most of the variability being at intra-seasonal scales. Spectral and cross-wavelet analysis reveals closely related tidal variability over the two sites, indicating that the variability occurs on spatial scales large compared to the spacing between the two radars. In some, but not all, cases, periodic variability of tidal amplitudes is associated with simultaneously present planetary waves of similar period, suggesting the variability is a consequence of non-linear interaction. Calculation of the zonal wave number of a number of large amplitude planetary waves suggests that during summer 1991 the 2-day wave had a zonal wave number of 3, but that during January±February 1991 it had a zonal wave number of 4.

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“…This method has proved to be a powerful tool for the estimation of nonlinear interactions and has frequently been used for analysing MLT winds in recent years (Rüster, 1994;Clark and Bergin, 1997;Kamalabadi et al, 1997;Beard et al, 1999). We used an indirect method of bispectrum estimate (Chrysostomos et al, 1987) and did not divide an investigated time interval into subrecords.…”

Section: Measurements and Data Analysismentioning

confidence: 99%

“…We used an indirect method of bispectrum estimate (Chrysostomos et al, 1987) and did not divide an investigated time interval into subrecords. This method permits one only to reach a conclusion about the correspondence of the frequencies in accordance with the theory of nonlinear interaction; but, as pointed out by Beard et al (1999), this cannot be considered as real proof of a non-linear process actually occurring. However, when investigating time series that are relatively short with respect to the periods to be investigated, subdividing the time series would result in too great a loss of spectral resolution.…”

Section: Measurements and Data Analysismentioning

confidence: 99%

“…Teitelbaum and Vial (1991) suggested that some observations might be explained by nonlinear interactions between tides and planetary waves, whose periods are equal to those of the tidal modulations. In recent years, several authors considered the tidal modulations excited by the nonlinear interaction with planetary waves (Mitchell et al, 1996;Beard et al, 1997Beard et al, , 1999Kamalabadi et al, 1997;Jacobi, 1999;Pancheva and Mukhtarov, 2000). Due to the long periods involved, to date, only a few studies on the nonlinear interaction of different planetary waves have been carried out (Jacobi et al, 1998;.…”

Section: Introductionmentioning

confidence: 99%

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On the longitudinal structure of the transient day-to-day variation of the semidiurnal tide in the mid-latitude lower thermosphere − I. Winter season

et al. 2001

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Abstract. The longitudinal structure of the day-to-day variations of semidiurnal tide amplitudes is analysed based on coordinated mesosphere/lower thermosphere wind measurements at several stations during three winter campaigns. Possible excitation sources of these variations are discussed. Special attention is given to a nonlinear interaction between the semidiurnal tide and the day-to-day mean wind variations. Data processing includes the S-transform analysis which takes into account transient behaviour of secondary waves. It is shown that strong tidal modulations appear during a stratospheric warming and may be caused by aperiodic mean wind variations during this event.

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Non-linear interactions between tides and planetary waves resulting in periodic tidal variability

Cited by 139 publications

References 38 publications

Intensive radiosonde observations of the diurnal tide and planetary waves in the lower atmosphere over Yichang (111°18' E, 30°42' N), China

Intensive radiosonde observations of the diurnal tide and planetary waves in the lower atmosphere over Yichang (111°18' E, 30°42' N), China

A comparative study of winds and tidal variability in the mesosphere/lower-thermosphere region over Bulgaria and the UK

On the longitudinal structure of the transient day-to-day variation of the semidiurnal tide in the mid-latitude lower thermosphere − I. Winter season

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