Preprints
https://doi.org/10.5194/acp-2022-407
https://doi.org/10.5194/acp-2022-407
 
15 Aug 2022
15 Aug 2022
Status: this preprint is currently under review for the journal ACP.

Nonlinear resonant interactions of atmospheric tides with annual oscillation based on meteor radar observation and reanalysis data

Xiansi Huang1,2,3, Kaiming Huang1,2,3, Hao Cheng1,2, Shaodong Zhang1,2, Wei Cheng4, Chunming Huang1,2, and Yun Gong1,2 Xiansi Huang et al.
  • 1School of Electronic Information, Wuhan University, Wuhan, China
  • 2Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, China
  • 3State Observatory for Atmospheric Remote Sensing, Wuhan, China
  • 4Beijing Institute of Applied Meteorology, Beijing, China

Abstract. Nonlinear interactions among gravity waves and among tides and planetary waves (PWs) have extensively been studied, however, resonant interactions between tides and annual (AO) and semiannual (SAO) oscillations were not reported. By using meteor radar observations and reanalysis data for 9 years, we demonstrate that the sum and difference resonant interactions between the diurnal (DT)/semidiurnal (SDT) tides and the AO/SAO do occur in the mesosphere and lower thermosphere (MLT). Both the frequencies and wavenumbers of the secondary waves in the sum (difference) resonant interactions just equal the sum (difference) frequencies and wavenumbers between the DT/SDT and the AO/SAO. Spectral analysis shows that only the DT, SDT, AO, SAO and their secondary waves are the predominant components in both the zonal and meridional winds at 90 km with the spectral amplitudes of 3.5–17.7 ms-1, being much stronger than all the other spectral amplitudes, including the amplitudes (2.1–2.2 ms-1) of the relatively strong terdiurnal tide and 16-day PW. At some altitudes in the MLT, the secondary waves are more intense than the DT/SDT, thus in tidal studies, the magnitude of the secondary waves may be regarded as the tidal one if the observational period is not long enough or their spectral peaks are not distinguished carefully.

Xiansi Huang et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on acp-2022-407', Paul PUKITE, 16 Aug 2022
  • RC1: 'Comment on acp-2022-407', Anonymous Referee #1, 10 Sep 2022
    • CC2: 'Reply on RC1', Paul PUKITE, 12 Sep 2022
  • RC2: 'Comment on acp-2022-407', Anonymous Referee #2, 12 Sep 2022

Xiansi Huang et al.

Xiansi Huang et al.

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Short summary
Using radar observations and reanalysis data for 9 years, we demonstrate clearly for the first time that resonant interactions between tides and annual and semiannual oscillations do occur in the mesosphere and lower thermosphere. The resonant matching conditions of frequency and wavenumber are exactly satisfied for the interacting triad. At some altitudes, the secondary waves are stronger than the tides, thus in tidal studies, the secondary waves may be mistaken for the tides if no carefully.
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