Articles | Volume 33, issue 2
Ann. Geophys., 33, 199–206, 2015
Ann. Geophys., 33, 199–206, 2015

Regular paper 23 Feb 2015

Regular paper | 23 Feb 2015

The Hiccup: a dynamical coupling process during the autumn transition in the Northern Hemisphere – similarities and differences to sudden stratospheric warmings

V. Matthias et al.

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A vertical coupling process in the northern high-latitude middle atmosphere has been identified during the equinox transitions, which we call the “hiccup” and which acts like a “mini sudden stratospheric warming (SSW)”. We study the average characteristics of the hiccup based on a composite analysis using a nudged model. A comparison of the average characteristics of hiccups and SSWs shows both similarities and differences between the two vertical coupling processes.