The Lack of a QBO-MJO Connection in Climate Models With a Nudged Stratosphere

Zane K. Martin, Isla R. Simpson, Pu Lin, Clara Orbe, Qi Tang, Julie M. Caron, Chih Chieh Chen, Hyemi Kim, L. Ruby Leung, Jadwiga H. Richter, Shaocheng Xie

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The observed stratospheric quasi-biennial oscillation (QBO) and the tropospheric Madden-Julian oscillation (MJO) are strongly connected in boreal winter, with stronger MJO activity when lower-stratospheric winds are easterly. However, the current generation of climate models with internally generated representations of the QBO and MJO do not simulate the observed QBO-MJO connection, for reasons that remain unclear. This study builds on prior work exploring the QBO-MJO link in climate models whose stratospheric winds are relaxed toward reanalysis, reducing stratospheric biases in the model and imposing a realistic QBO. A series of ensemble experiments are performed using four state-of-the-art climate models capable of representing the MJO over the period 1980–2015, each with similar nudging in the stratosphere. In these four models, nudging leads to a good representation of QBO wind and temperature signals, however no model simulates the observed QBO-MJO relationship. Biases in MJO vertical structure and cloud-radiative feedbacks are investigated, but no conclusive model bias or mechanism is identified that explains the lack of a QBO-MJO connection.

Original languageEnglish
Article numbere2023JD038722
JournalJournal of Geophysical Research: Atmospheres
Volume128
Issue number17
DOIs
StatePublished - 16 Sep 2023

Bibliographical note

Publisher Copyright:
© 2023 American Geophysical Union. All Rights Reserved. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.

Keywords

  • Madden-Julian oscillation
  • climate models
  • nudged simulations
  • quasi-biennial oscillation

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