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Role of quasiresonant planetary wave dynamics in recent boreal spring-to-autumn extreme events

Urheber*innen
/persons/resource/petoukhov

Petoukhov,  Vladimir
Potsdam Institute for Climate Impact Research;

/persons/resource/petri

Petri,  Stefan
Potsdam Institute for Climate Impact Research;

/persons/resource/Stefan.Rahmstorf

Rahmstorf,  Stefan
Potsdam Institute for Climate Impact Research;

/persons/resource/coumou

Coumou,  Dim
Potsdam Institute for Climate Impact Research;

/persons/resource/kornhuber

Kornhuber,  Kai
Potsdam Institute for Climate Impact Research;

/persons/resource/emdir

Schellnhuber,  Hans Joachim
Potsdam Institute for Climate Impact Research;

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7209.pdf
(Verlagsversion), 841KB

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Zitation

Petoukhov, V., Petri, S., Rahmstorf, S., Coumou, D., Kornhuber, K., Schellnhuber, H. J. (2016): Role of quasiresonant planetary wave dynamics in recent boreal spring-to-autumn extreme events. - Proceedings of the National Academy of Sciences of the United States of America (PNAS), 113, 25, 6862-6867.
https://doi.org/10.1073/pnas.1606300113


Zitierlink: https://publications.pik-potsdam.de/pubman/item/item_20945
Zusammenfassung
In boreal spring-to-autumn (May-to-September) 2012 and 2013, the Northern Hemisphere (NH) has experienced a large number of severe midlatitude regional weather extremes. Here we show that a considerable part of these extremes were accompanied by highly magnified quasistationary midlatitude planetary waves with zonal wave numbers m = 6, 7, and 8. We further show that resonance conditions for these planetary waves were, in many cases, present before the onset of high-amplitude wave events, with a lead time up to 2 wk, suggesting that quasiresonant amplification (QRA) of these waves had occurred. Our results support earlier findings of an important role of the QRA mechanism in amplifying planetary waves, favoring recent NH weather extremes.