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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/angeo-2019-145
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-2019-145
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: regular paper 28 Oct 2019

Submitted as: regular paper | 28 Oct 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Annales Geophysicae (ANGEO).

Forcing mechanisms of the quarterdiurnal tide

Christoph Geißler, Christoph Jacobi, and Friederike Lilienthal Christoph Geißler et al.
  • Institute for Meteorology, Universität Leipzig, Stephanstr. 3, 04103 Leipzig, Germany

Abstract. We used a nonlinear mechanistic global circulation model to analyze the migrating quarterdiurnal tide (QDT) in the middle atmosphere with focus on its possible forcing mechanisms. These are absorption of solar radiation by ozone and water vapor, nonlinear tidal interactions, and gravity wave-tide interactions. We show a climatology of the QDT amplitudes, and we examined the contribution of the different forcing mechanisms on the QDT amplitude. To this end, we first extracted the QDT in the model tendency terms. Then, we separately removed the QDT contribution in different tendency terms. We find that the solar forcing mechanism is the most important one for the QDT, but also the nonlinear and gravity wave forcing mechanism play a role in certain seasons, latitudes and altitudes. Furthermore, destructive interference between the individual forcing mechanisms are observed. Therefore, tidal amplitudes partly become even larger in simulations with removed nonlinear or gravity wave forcing mechanism.

Christoph Geißler et al.
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Status: open (until 20 Dec 2019)
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Christoph Geißler et al.
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Short summary
This is an extensive model study to analyze the migrating quarterdiurnal solar tide (QDT) and their forcing mechanisms in the middle atmosphere. We show first a climatology of the QDT amplitudes and examine the contribution of the different forcing mechanisms, like direct solar, nonlinear and gravity wave forcing, on the QDT amplitude. Furthermore, we investigate destructive interference between the individual forcing mechanisms.
This is an extensive model study to analyze the migrating quarterdiurnal solar tide (QDT) and...
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