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Evidence Q6DW-Tide-GW Interactions Observed at 30ºS Triggered by the 2019 Southern Hemispheric SSW

Authors

Qiao,  Zishun
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Liu,  Alan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Pedatella,  Nicholas
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Stober,  Gunter
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Reid,  Iain
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Fuentes,  Javier
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Adami,  Chris
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Qiao, Z., Liu, A., Pedatella, N., Stober, G., Reid, I., Fuentes, J., Adami, C. (2023): Evidence Q6DW-Tide-GW Interactions Observed at 30ºS Triggered by the 2019 Southern Hemispheric SSW, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3131


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5020516
Abstract
Observations from CONDOR and Buckland Park meteor radars at 30ºS reveal that a strong westward propagating quasi-6-day wave with zonal wavenumber 1 is associated with the rare 2019 Southern Hemispheric Sudden Stratospheric Warming (SSW) and interacts with the diurnal tide and gravity waves. The diurnal tide is amplified every 6 days, and a 21-h child wave occurs which could be attributed to the Q6DW-diurnal tide nonlinear interaction. Gravity wave (GW) variances computed by a recently developed 3DVAR algorithm appear to oscillate with a 4- to 6-day periodicity and might be responsible for the period and phase shift of Q6DW. Both the 21-h child wave and Q6DW-modulated GW could propagate vertically to the ionosphere and be responsible for producing the ionospheric 6-day periodicity. The local E-P flux of Q6DW calculated with the wind and temperature from the CONDOR meteor radar showed enhancement of the Q6DW and is in general agreement with the E-P flux from the SD-WACCM-X simulation. This work provides observational evidence that SSW-triggered Q6DW-tide and Q6DW-GW interactions play an important role in the coupling between the ionospheric 6-day variability and the lower atmospheric forcing.