Journal article
Summertime planetary wave resonance in the Northern and Southern hemispheres
K Kornhuber, V Petoukhov, D Karoly, S Petri, S Rahmstorf, D Coumou
Journal of Climate | AMER METEOROLOGICAL SOC | Published : 2017
Abstract
Slow-moving planetary waves of high amplitudes are often associated with persistent surface weather conditions. This persistence can lead to extreme weather events with potentially serious implications for society and nature. Quasi-resonant amplification (QRA) of planetary waves has been proposed as a mechanism to generate high-amplitude hemisphere-wide patterns of wavenumbers 6-8 in the Northern Hemisphere (NH) summer. Here this mechanism is studied in both hemispheres. Analyzing 1979-2015 reanalysis data, evidence for QRA in the Southern Hemisphere (SH) is found for wavenumbers 4 and 5. It is shown that the difference in resonating wavenumbers between hemispheres stems from the different m..
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Funding Acknowledgements
The authors thank Terence O'Kane and an anomymous reviewer for their valuable comments, which much improved this manuscript, and Claire Fyson and Jascha Lehmann for support in final editing of the manuscript. The authors thank the ERA-Interim project at the ECMWF for making their data available. We also gratefully acknowledge the European Regional Development Fund (ERDF), the German Federal Ministry of Education and Research (BMBF) and the Land Brandenburg for supporting this project by providing resources on the high performance computer system at the Potsdam Institute for Climate Impact Research. Kai Kornhuber thanks the German Academic Exchange Service (DAAD) for the financial support and the German-Australian Climate and Energy College for their hospitality and support during a research stay at the University of Melbourne. The presented work was supported by the BMBF (Grant 01LN1304A).