Abstract
The dynamics of solar tides is investigated with regard to variations of the background atmosphere, including planetary waves (PW), and to the interaction with gravity waves (GW). (1) Using a linear model with a clear cause-effect relationship, it is shown that planetary waves play an important role in tidal dynamics, most importantly by inducing non-migrating tidal components from a migrating thermal forcing. (2) Ray-tracing simulations are used to analyze the GW force on the large-scale flow including the solar tides. In comparison to classic GW parameterizations, the inclusion of time-dependence and horizontal refraction leads to a significant decrease of the GW drag.
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Acknowledgements
The authors thank Erich Becker for inspiring discussions and Hauke Schmidt from MPI Hamburg for providing the set of HAMMONIA data. U.A. thanks Deutsche Forschungsgemeinschaft for partial support through the MetStröm Priority Research Program (SPP 1276), and through Grant Ac 71/4-1. U.A. and F.S. thank Deutsche Forschungsgemeinschaft for partial support through the CAWSES Priority Research Program (SPP 1176), and through Grant Ac 71/2-1.
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Achatz, U., Senf, F., Grieger, N. (2013). Solar Diurnal Tides in the Middle Atmosphere: Interactions with the Zonal-Mean Flow, Planetary Waves and Gravity Waves. In: Lübken, FJ. (eds) Climate and Weather of the Sun-Earth System (CAWSES). Springer Atmospheric Sciences. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4348-9_27
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