A Multiscale Interaction Mechanism for the Observed QBO-MJO Connection

A Multiscale Interaction Mechanism for the Observed QBO-MJO Connection | Authorea try { document.documentElement.classList.add('js'); } catch (e) { } var _gaq = _gaq || []; _gaq.push(['_setAccount', 'G-8VDV14Y67G']); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s); })(); Skip to main content Preprints Collections Wiley Open Research IET Open Research Ecological Society of Japan All Collections About About Authorea FAQs Contact Us Quick Search anywhere Search for preprint articles, keywords, etc. Search Search ADVANCED SEARCH SCROLL This is a preprint and has not been peer reviewed. Data may be preliminary. 30 September 2025 V1 Latest version Share on A Multiscale Interaction Mechanism for the Observed QBO-MJO Connection Authors : Kai Huang 0000-0001-7342-6780 [email protected] , Chih-Chieh Chen 0000-0002-4819-2510 , Mitchell W Moncrieff 0000-0003-4496-1463 , and Jadwiga H. Richter 0000-0001-7048-0781 Authors Info & Affiliations https://doi.org/10.22541/au.175924948.81063758/v1 223 views 167 downloads Contents Abstract Supplementary Material Information & Authors Metrics & Citations View Options References Figures Tables Media Share Abstract A multiscale interaction mechanism is proposed to understand the observed connection between the stratospheric Quasi-Biennial Oscillation (QBO) and the tropospheric Madden-Julian Oscillation (MJO). MJO convection is led by anomalous wetting and warming preconditioning around the middle-lower troposphere in the boreal winter with a QBO easterly (QBOE) phase as favorable thermal conditions for its development. The causes are the QBO modulating Mesoscale Convective System (MCS) activities around the Maritime Continent (MC) where a westward shift is found in the QBOE phase. The leading MCS precipitation therefore preconditions MJO convection in the QBOE phase, favoring its eastward propagation across the MC. The QBOW phase hinders MJO propagation by suppressing the leading MCS precipitation west of the MC and decoupling it from MJO convection over the MC. The downward gravity wave reflection by QBO wind shear is one potential mechanism for the QBO-MCS connection as proposed by a previous study. Supplementary Material File (1048470_0_merged_1757707204.pdf) Download 5.70 MB File (qbo_mjo_mcs.pdf) Download 5.69 MB File (qbo_mjo_mcs_si.pdf) Download 2.01 MB Information & Authors Information Version history V1 Version 1 30 September 2025 Copyright This work is licensed under a Non Exclusive No Reuse License. Keywords madden-julian oscillation quasi-biennial oscillation stratosphere-troposphere coupling subseasonal-to-seasonal tropical meteorology Authors Affiliations Kai Huang 0000-0001-7342-6780 [email protected] National Center for Atmospheric Research View all articles by this author Chih-Chieh Chen 0000-0002-4819-2510 NCAR CGD View all articles by this author Mitchell W Moncrieff 0000-0003-4496-1463 National Center for Atmospheric Research (UCAR) View all articles by this author Jadwiga H. Richter 0000-0001-7048-0781 National Center for Atmospheric Research (UCAR) View all articles by this author Metrics & Citations Metrics Article Usage 223 views 167 downloads .FvxKWukQNSOunydq8rnd { width: 100px; } Citations Download citation Kai Huang, Chih-Chieh Chen, Mitchell W Moncrieff, et al. A Multiscale Interaction Mechanism for the Observed QBO-MJO Connection. Authorea . 30 September 2025. 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