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

• Main Authors: Charuvil Asokan, Harikrishnan, Chau, Jorge L., Pedatella, Nicholas, Conte, J. Federico
• Format: Conference Object
• Language: unknown
• Published: GFZ German Research Centre for Geosciences 2023
• Subjects: Norway; Northern Norway
• Online Access: https://dx.doi.org/10.57757/iugg23-1230; https://gfzpublic.gfz-potsdam.de/pubman/item/item_5017399

<!--!introduction!--> 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 ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ...