EGU21-608, updated on 22 Apr 2021
EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Planetary wave-tide nonlinear interactions increase the variety of MLT waves in summer 2019

Maosheng He1, Jorge L. Chau1, Jeffrey M. Forbes2, Denise Thorsen3, Guozhu Li4,5, Tarique Adnan Siddiqui1, Yosuke Yamazaki6, Wayne K. Hocking7, Christoph Jacobi8, and Peter Hoffmann1
Maosheng He et al.
  • 1Leibniz Institute of Atmospheric Physics, Kühlungsborn, Germany (
  • 2Ann and H.J. SmeadDepartment of Aerospace Engineering Sciences, University of Colorado, Boulder, CO, USA
  • 3Department of Electrical and Computer Engineering, University of Alaska Fairbanks, Fairbanks, AK, USA
  • 4Beijing National Observatory of SpaceEnvironment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China,
  • 5College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China,
  • 6GFZ German Research Centre for Geosciences, Potsdam, Germany,
  • 7University of Western Ontario, Richmond, Ontario, Canada
  • 8Institut fur Meteorologie, Universitat Leipzig, Germany

Mesospheric winds collected by multiple meteor radars at mid-latitudes in the northern hemispheric are combined to investigate wave activities in June—October 2019. Dual-station approaches are developed and implemented to diagnose zonal wavenumber $m$ of spectral peaks.  In  September—October, diagnosed are quasi‐10‐ and 6‐day planetary waves (Q10DW and Q6DW, $m=$1), solar semi-diurnal tides with $m=$1, 2, 3 (SW1, SW2, and SW3), lunar semi-diurnal tide, and the upper and lower sidebands (USB and LSB, $m=$ 1 and 3) of Q10DW‐SW2 nonlinear interactions.  During June— September, diagnosed are Rossby-gravity modes ($m=$3 and 4 at periods $T=$ 2.1d and 1.7d), and their USBs and LSBs generated from interactions with diurnal, semi-diurnal, ter-diurnal, and quatra-diurnal migrating tides. These results demonstrate that the planetary wave-tide nonlinear interactions significantly increase the variety of waves in the mesosphere and lower thermosphere region (MLT).

How to cite: He, M., Chau, J. L., Forbes, J. M., Thorsen, D., Li, G., Siddiqui, T. A., Yamazaki, Y., Hocking, W. K., Jacobi, C., and Hoffmann, P.: Planetary wave-tide nonlinear interactions increase the variety of MLT waves in summer 2019, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-608,, 2021.

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