Heat Extremes Driven by Amplification of Phase-Locked Circumglobal Waves Forced by Topography in an Idealized Atmospheric Model.

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Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_15B636E48417
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Heat Extremes Driven by Amplification of Phase-Locked Circumglobal Waves Forced by Topography in an Idealized Atmospheric Model.
Journal
Geophysical research letters
Author(s)
Jiménez-Esteve B., Kornhuber K., Domeisen DIV
ISSN
0094-8276 (Print)
ISSN-L
0094-8276
Publication state
Published
Issued date
16/11/2022
Peer-reviewed
Oui
Volume
49
Number
21
Pages
e2021GL096337
Language
english
Notes
Publication types: Journal Article
Publication Status: ppublish
Abstract
Heatwaves are persistent temperature extremes associated with devastating impacts on human societies and ecosystems. In the midlatitudes, amplified quasi-stationary Rossby waves have been identified as a key mechanism for heatwave occurrence. Amplified waves with preferred longitudinal locations lead to concurrent extremes in specific locations. It is therefore important to identify the essential components in the climate system that contribute to phase-locking of wave patterns. Here, we investigate the role of dry atmospheric dynamics and topography in causing concurrent heatwaves by using an idealized general circulation model. Topography is included in the model experiments as a Gaussian mountain. Our results show that amplified Rossby waves exhibit clear phase-locking behavior and a decrease in the zonal phase speed when a large-scale localized topographic forcing is imposed, leading to concurrent heat extremes at preferred locations.
Keywords
topography, circumglobal teleconnections, Rossby waves, heatwaves, idealized modeling, phase locking
Pubmed
Web of science
Open Access
Yes
Funding(s)
Swiss National Science Foundation / PP00P2_198896
Swiss National Science Foundation / PP00P2_170523
Create date
19/01/2023 18:47
Last modification date
10/07/2024 7:05
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