Titre

The Role of the Stratosphere in Teleconnections Arising From Fast and Slow MJO Episodes

Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
Auteur(s)
Yadav, Priyanka
Auteure/Auteur
Garfinkel, Chaim I.
Auteure/Auteur
Domeisen, Daniela I. V.
Auteure/Auteur
Liens vers les personnes
Liens vers les unités
Statut éditorial
Publié
Date de publication
2024-01-16
Volume
51
Première page
e2023GL104826
Peer-reviewed
Oui
Langue
anglais
Résumé
The Madden-Julian Oscillation (MJO) can influence the extratropical circulation on timescales up to several weeks, with a dependence on the MJO characteristics: MJO episodes that propagate slowly across the Maritime Continent have a stronger impact on Euro-Atlantic weather than fast MJO episodes. While the tropospheric pathway for MJO teleconnections with varying phase speeds is well understood, in this study, we investigate the contribution of the Northern Hemisphere stratospheric pathway for fast versus slow MJO episodes. During slow MJO episodes, Phases 5–6 lead to increased upward wave propagation in the North Pacific sector, and subsequently enhanced heat flux at 100 hPa, leading to the weakening of the polar vortex. The results suggest a clear role of stratosphere-troposphere coupling for slow MJO episodes, which is proposed as a mechanism for anomalously strong positive polar cap height anomalies in MJO Phases 7–8.
Sujets

MJO teleconnections

stratosphere-troposph...

role of stratosphere ...

atmospheric circulati...

Madden-Julian Oscilla...

PID Serval
serval:BIB_498D31035A85
DOI
Permalien
URL éditeur
Date de création
2024-10-31T22:19:09.809Z
Date de création dans IRIS
2025-05-20T16:03:10Z
Fichier(s)
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Nom

Geophysical Research Letters - 2024 - Yadav - The Role of the Stratosphere in Teleconnections Arising From Fast and Slow.pdf

Version du manuscrit

published

Licence

https://creativecommons.org/licenses/by-nc-nd/4.0

Taille

1.06 MB

Format

Adobe PDF

PID Serval

serval:BIB_498D31035A85.P001

URN

urn:nbn:ch:serval-BIB_498D31035A858

Somme de contrôle

(MD5):fe22857ab7135bfbe706399b2a68adfb