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Observational investigation on the influence of polar vortex strength on the mesosphere and lower thermosphere at middle and high latitudes

Authors

Charuvil Asokan,  Harikrishnan
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Chau,  Jorge L.
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;

Conte,  J. Federico
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Charuvil Asokan, H., Chau, J. L., Pedatella, N., Conte, J. F. (2023): Observational investigation on the influence of polar vortex strength on the mesosphere and lower thermosphere at middle and high latitudes, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-1230


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017399
Abstract
A recent study by Pedatella & Harvey (2022) investigated the influence of the stratospheric polar vortex on the mesosphere and the lower thermosphere (MLT) winds and tides using the Specified Dynamics Whole Atmosphere Community Climate Model with thermosphere-ionosphere eXtension (SD-WACCM-X) simulations. The model predicted that there would be a reduction in the migrating semidiurnal tide during strong polar vortex days, particularly at middle latitudes in the Northern Hemisphere. Here, we investigate this impact with unique observational datasets spanning 17 years of data collected in the MLT between 80-100 km by specular meteor radars at the middle (Germany, ~54°N) and high latitudes (Northern Norway, ~69°N). Correlation studies between Northern Annular Mode (NAM) at 10 hPa and estimated total amplitude of semidiurnal tidal anomalies are conducted at different altitudes. Preliminary results indicate that polar vortex strength slightly influences semidiurnal tidal anomalies but shows a clear altitude dependence on these influences. The analysis also suggests a stronger impact on weaker polar vortex days than on stronger days.