Planetary wave-tide nonlinear interactions increase the variety of MLT waves in summer 2019
- 1Leibniz Institute of Atmospheric Physics, Kühlungsborn, Germany (he@iap-kborn.de)
- 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, https://doi.org/10.5194/egusphere-egu21-608, 2021.
