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  • Presentation | A44G: The Dynamics of Large-Scale Atmospheric Circulation in Present and Future Climates: Jet Streams, Storm Tracks, Stationary Waves, and Monsoons IV Oral
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  • A44G-04: Increased Frequency of Planetary Wave Resonance Events over the Past Half-Century
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  • Location Icon278-279
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Author(s):
Xueke Li, University of Pennsylvania (First Author, Presenting Author)
Michael Mann, University of Pennsylvania
Michael Wehner, Applied Mathematics and Computational Research Division, Lawrence Berkeley National Laboratory
Shannon Christiansen, University of Pennsylvania


Climate change is increasing the frequency and severity of boreal summer extreme weather events, many of which are inextricably linked to the phenomenon of resonant planetary wave amplification. However, due to incomplete knowledge of climate change impacts on these dynamical mechanisms, combined with limited observational records, significant uncertainties remain regarding the magnitude of such an impact. Our analysis reveals a threefold increase in this phenomenon over the past seven decades, closely tied to amplified Arctic warming and land–sea thermal contrast. We also observe increased prevalence of resonance events during the mature phase of strong El Niño events. These findings advance our understanding of how both human-caused climate change and natural climate variability impact mid-latitude atmospheric dynamics and extreme weather events.



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Discussion