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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/acp-2017-647
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
11 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).
The role of the winter residual circulation in the summer mesopause regions in WACCM
Maartje Sanne Kuilman and Bodil Karlsson Department of Meteorology, Stockholm University, 10691 Stockholm, Sweden
Abstract. High winter planetary wave activity warms the summer polar mesopause via a link between the two hemispheres. In a recent study carried out with the K├╝hlungsborn Mechanistic general Circulation Model (KMCM), it was shown that the net effect of this interhemispheric coupling mechanism is a cooling of the summer polar mesospheres and that this temperature response is tied to the strength of the gravity wave-driven winter mesospheric flow. We here reconfirm the hypothesis that the summer polar mesosphere would be substantially warmer without the circulation in the winter mesosphere, using the widely-used Whole Atmosphere Community Climate Model (WACCM). In addition, the role of the stratosphere in shaping the conditions of the summer polar mesosphere is investigated. Using composite analysis, we show that if winter gravity waves are absent, a weak stratospheric Brewer-Dobson circulation would lead to a warming of the summer mesosphere region instead of a cooling, and vice versa. This is opposing the temperature signal of the interhemispheric coupling in the mesosphere, in which a cold winter stratosphere goes together with a cold summer mesopause. We hereby strengthen the evidence that the equatorial mesospheric temperature response, driven by the winter gravity waves, is a crucial step in the interhemispheric coupling mechanism.

Citation: Kuilman, M. S. and Karlsson, B.: The role of the winter residual circulation in the summer mesopause regions in WACCM, Atmos. Chem. Phys. Discuss., https://doi.org/10.5194/acp-2017-647, in review, 2017.
Maartje Sanne Kuilman and Bodil Karlsson
Maartje Sanne Kuilman and Bodil Karlsson
Maartje Sanne Kuilman and Bodil Karlsson

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