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Reference: Rajendran, K, Moroz, I, Read, P et al., (2016). Synchronisation of the equatorial QBO by the annual cycle in tropical upwelling in a warming climate. Quarterly Journal of the Royal Meteorological Society, 142 (695), 1111–1120.Citable link to this page:

 

Synchronisation of the equatorial QBO by the annual cycle in tropical upwelling in a warming climate

Abstract: The response of the period of the quasi-biennial oscillation (QBO) to increases intropical upwelling are considered using a one-dimensional model. We find that theimposition of the annual cycle in tropical upwelling creates substantial variability inthe period of the QBO. The annual cycle creates synchronisation regions in the waveforcing space, within which the QBO period locks onto an integer multiple of the annualforcing period. Outside of these regions, the QBO period undergoes discrete jumps asit attempts to find a stable relationship with the oscillator forcing. The resulting set ofQBO periods can be either discrete or broad-banded, depending on the intrinsic periodof the QBO.We use the same model to study the evolution of the QBO period as the strength oftropical upwelling increases as would be expected in a warmer climate. The QBOperiod lengthens and migrates closer towards 36 and 48 month locking regions asupwelling increases. The QBO period does not vary continuously with increasedupwelling, however, but instead transitions through a series of 2- and 3-cycles beforebecoming locked to the annual cycle. Finally, some observational evidence for thecyclical behaviour of the QBO periods in the real atmosphere is presented.

Peer Review status:Peer reviewedPublication status:PublishedVersion:Publisher's versionNotes:Copyright © 2015 The Authors. Quarterly Journal of the Royal Meteorological Society published by John Wiley and Sons Ltd on behalf of the Royal Meteorological Society.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Bibliographic Details

Publisher: John Wiley and Sons Ltd

Publisher Website: http://onlinelibrary.wiley.com/

Journal: Quarterly Journal of the Royal Meteorological Societysee more from them

Publication Website: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1477-870X

Issue Date: 2016

pages:1111–1120Identifiers

Urn: uuid:ac6f94da-c9dd-4c28-9247-0c4009fbd387

Source identifier: 574465

Eissn: 1477-870X

Doi: https://doi.org/10.1002/qj.2714

Issn: 0035-9009 Item Description

Type: Journal article;

Version: Publisher's versionKeywords: QBO synchronisation Brewer-Dobson circulation climate change Tiny URL: pubs:574465

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Author: Rajendran, K - institutionUniversity of Oxford Oxford, MPLS, Mathematical Institute - - - Moroz, I - institutionUniversity of Oxf

Source: https://ora.ox.ac.uk/objects/uuid:ac6f94da-c9dd-4c28-9247-0c4009fbd387



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