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Earth System Dynamics An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/esd-2018-1
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
12 Jan 2018
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Earth System Dynamics (ESD).
Interannual variability of the gravity wave drag – vertical coupling and possible climate links
Petr Sacha1,2, Jiri Miksovsky1, and Petr Pisoft1 1Department of Atmospheric Physics, Faculty of Mathematics and Physics, Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic
2Faculty of Sciences, Universidade de Vigo, Ourense, Spain
Abstract. Gravity wave drag (GWD) is an important driver of the middle atmospheric dynamics. However, there are almost no observational constraints on its strength and distribution (especially horizontal). In this study we analyze orographic GWD (OGWD) output from Canadian Middle Atmosphere Model simulation with specified dynamics (CMAM-sd) to illustrate an interannual variability of the OGWD distribution at particular pressure levels in the stratosphere and its relation to major climate oscillations. We have found significant changes of the OGWD distribution and strength depending on the phase of the North Atlantic oscillation (NAO), Quasi Biennial oscillation (QBO) and El Niño-Southern oscillation (ENSO). The OGWD variability is shown to be induced by lower tropospheric behavior by a large part. We argue that the orographic gravity waves (OGWs) and GWs in general can be a quick mediator of the tropospheric variability into the stratosphere as they have a modified impact on the stratospheric dynamics during different phases of the studied climate oscillations due to the differences in the OGWD distribution.

Citation: Sacha, P., Miksovsky, J., and Pisoft, P.: Interannual variability of the gravity wave drag – vertical coupling and possible climate links, Earth Syst. Dynam. Discuss., https://doi.org/10.5194/esd-2018-1, in review, 2018.
Petr Sacha et al.
Petr Sacha et al.
Petr Sacha et al.

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Short summary
The paper investigates variability of the gravity wave drag in the stratosphere in connection with climate phenomena like El Niño-Southern oscillation. This link represents a possible mechanism of the tropospheric influence on the higher atmospheric layers – mechanism of utmost importance that has not been studied in details yet. The results illustrates that there are indeed significant changes of the gravity wave drag distribution and strength depending on the phase of the studied oscillations.
The paper investigates variability of the gravity wave drag in the stratosphere in connection...
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