Role of atmospheric resonance and land–atmosphere feedbacks as a precursor to 
the June 2021 Pacific Northwest Heat Dome event

Li, Xueke; Mann, Michael E.; Wehner, Michael F.; Rahmstorf, Stefan; Petri, Stefan; Christiansen, Shannon; Carrillo, Judit

doi:10.1073/pnas.2315330121

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Role of atmospheric resonance and land–atmosphere feedbacks as a precursor to the June 2021 Pacific Northwest Heat Dome event

Authors

Li, Xueke
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Mann, Michael E.
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Wehner, Michael F.
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/persons/resource/Stefan.Rahmstorf

Rahmstorf, Stefan
Potsdam Institute for Climate Impact Research;

/persons/resource/petri

Petri, Stefan
Potsdam Institute for Climate Impact Research;

Christiansen, Shannon
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Carrillo, Judit
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Citation

Li, X., Mann, M. E., Wehner, M. F., Rahmstorf, S., Petri, S., Christiansen, S., Carrillo, J. (2024): Role of atmospheric resonance and land–atmosphere feedbacks as a precursor to the June 2021 Pacific Northwest Heat Dome event. - Proceedings of the National Academy of Sciences of the United States of America (PNAS), 121, 4, e2315330121.
https://doi.org/10.1073/pnas.2315330121

Cite as: https://publications.pik-potsdam.de/pubman/item/item_29484

Abstract

We demonstrate an indirect, rather than direct, role of quasi-resonant amplification of planetary waves in a summer weather extreme. We find that there was an interplay between a persistent, amplified large-scale atmospheric circulation state and soil moisture feedbacks as a precursor for the June 2021 Pacific Northwest “Heat Dome” event. An extended resonant planetary wave configuration prior to the event created an antecedent soil moisture deficit that amplified lower atmospheric warming through strong nonlinear soil moisture feedbacks, favoring this unprecedented heat event.