A Case Study of the Solar and Lunar Semidiurnal Tide Response to the 2013 Sudden Stratospheric Warming ...

• Main Authors: van Caspel, Willem E., Espy, Patrick, Hibbins, Robert, Stober, Gunter, Brown, Peter, Jacobi, Christoph, Kero, Johan
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: AGU Publications 2023
• Subjects: 570 Life sciences; biology; 620 Engineering; 500 Science; 530 Physics; Kiruna
• Online Access: https://dx.doi.org/10.48350/186150; https://boris.unibe.ch/186150/

This study investigates the response of the semidiurnal tide (SDT) to the 2013 major sudden stratospheric warming (SSW) event using meteor radar wind observations and mechanistic tidal model simulations. In the model, the background atmosphere is constrained to meteorological fields from the Navy Global Environmental Model—High Altitude analysis system. The solar (thermal) and lunar (gravitational) SDT components are forced by incorporating hourly temperature tendency fields from the ERA5 forecast model, and by specifying the M2 and N2 lunar gravitational potentials, respectively. The simulated SDT response is compared against meteor wind observations from the CMOR (43.3°N, 80.8°W), Collm (51.3°N, 13.0°E), and Kiruna (67.5°N, 20.1°E) radars, showing close agreement with the observed amplitude and phase variability. Numerical experiments investigate the individual roles of the solar and lunar SDT components in shaping the net SDT response. Further experiments isolate the impact of changing propagation ...