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

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

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017399 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017399_1
Genre: Conference Paper

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 Creators:
Charuvil Asokan, Harikrishnan1, Author
Chau, Jorge L.1, Author
Pedatella, Nicholas1, Author
Conte, J. Federico1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 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.

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Language(s): eng - English
 Dates: 2023
 Publication Status: Finally published
 Pages: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-1230
 Degree: -

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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