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

Priyanka Yadav*, Chaim I. Garfinkel, Daniela I.V. Domeisen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageAmerican English
Article numbere2023GL104826
JournalGeophysical Research Letters
Volume51
Issue number1
DOIs
StatePublished - 16 Jan 2024

Bibliographical note

Publisher Copyright:
© 2024. The Authors.

Keywords

  • MJO teleconnections
  • Madden-Julian Oscillation
  • atmospheric circulation
  • role of stratosphere in MJO teleconnections
  • stratosphere-troposphere coupling

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