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  Evidence for wave resonance as a key mechanism for generating high-amplitude quasi-stationary waves in boreal summer

Kornhuber, K., Petoukhov, V., Petri, S., Rahmstorf, S., Coumou, D. (2017): Evidence for wave resonance as a key mechanism for generating high-amplitude quasi-stationary waves in boreal summer. - Climate Dynamics, 49, 5-6, 1961-1979.
https://doi.org/10.1007/s00382-016-3399-6

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Kornhuber, Kai1, Author              
Petoukhov, Vladimir1, Author              
Petri, Stefan1, Author              
Rahmstorf, Stefan1, Author              
Coumou, Dim1, Author              
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1Potsdam Institute for Climate Impact Research, ou_persistent13              

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 Abstract: Several recent northern hemisphere summer extremes have been linked to persistent high-amplitude wave patterns (e.g. heat waves in Europe 2003, Russia 2010 and in the US 2011, Floods in Pakistan 2010 and Europe 2013). Recently quasi-resonant amplification (QRA) was proposed as a mechanism that, when certain dynamical conditions are fulfilled, can lead to such high-amplitude wave events. Based on these resonance conditions a detection scheme to scan reanalysis data for QRA events in boreal summer months was implemented. With this objective detection scheme we analyzed the occurrence and duration of QRA events and the associated atmospheric flow patterns in 1979–2015 reanalysis data. We detect a total number of 178 events for wave 6, 7 and 8 and find that during roughly one-third of all high amplitude events QRA conditions were met for respective waves. Our analysis reveals a significant shift for quasi-stationary waves 6 and 7 towards high amplitudes during QRA events, lagging first QRA-detection by typically one week. The results provide further evidence for the validity of the QRA hypothesis and its important role in generating high amplitude waves in boreal summer.

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 Dates: 2017
 Publication Status: Finally published
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/s00382-016-3399-6
PIKDOMAIN: Earth System Analysis - Research Domain I
eDoc: 7312
Research topic keyword: Extremes
Research topic keyword: Atmosphere
Research topic keyword: Weather
Research topic keyword: Nonlinear Dynamics
Regional keyword: Global
Organisational keyword: RD1 - Earth System Analysis
Working Group: Earth System Model Development
Working Group: Earth System Modes of Operation
 Degree: -

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Title: Climate Dynamics
Source Genre: Journal, SCI, Scopus, p3
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Pages: - Volume / Issue: 49 (5-6) Sequence Number: - Start / End Page: 1961 - 1979 Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/journals77