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    QBO influence on MJO amplitude over the Maritime Continent: Physical mechanisms and seasonality

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    Article (2.207Mb)
    Date
    2019-01-07
    Author
    Densmore, Casey R.  Concept link
    Sanabia, Elizabeth  Concept link
    Barrett, Bradford S.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/23615
    As published
    https://doi.org/10.1175/MWR-D-18-0158.1
    DOI
    10.1175/MWR-D-18-0158.1
    Keyword
     Maritime Continent; Madden-Julian oscillation; Quasibiennial oscillation 
    Abstract
    The quasi-biennial oscillation (QBO) is stratified by stratospheric zonal wind direction and height into four phase pairs [easterly midstratospheric winds (QBOEM), easterly lower-stratospheric winds, westerly midstratospheric winds (QBOWM), and westerly lower-stratospheric winds] using an empirical orthogonal function analysis of daily stratospheric (100–10 hPa) zonal wind data during 1980–2017. Madden–Julian oscillation (MJO) events in which the MJO convective envelope moved eastward across the Maritime Continent (MC) during 1980–2017 are identified using the Real-time Multivariate MJO (RMM) index and the outgoing longwave radiation (OLR) MJO index (OMI). Comparison of RMM amplitudes by the QBO phase pair over the MC (RMM phases 4 and 5) reveals that boreal winter MJO events have the strongest amplitudes during QBOEM and the weakest amplitudes during QBOWM, which is consistent with QBO-driven differences in upper-tropospheric lower-stratospheric (UTLS) static stability. Additionally, boreal winter RMM events over the MC strengthen during QBOEM and weaken during QBOWM. In the OMI, those amplitude changes generally shift eastward to the eastern MC and western Pacific Ocean, which may result from differences in RMM and OMI index methodologies. During boreal summer, as the northeastward-propagating boreal summer intraseasonal oscillation (BSISO) becomes the dominant mode of intraseasonal variability, these relationships are reversed. Zonal differences in UTLS stability anomalies are consistent with amplitude changes of eastward-propagating MJO events across the MC during boreal winter, and meridional stability differences are consistent with amplitude changes of northeastward-propagating BSISO events during boreal summer. Results remain consistent when stratifying by neutral ENSO phase.
    Description
    Author Posting. © American Meteorological Society, 2019. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Monthly Weather Review 147(1), (2019): 389-406. doi: 10.1175/MWR-D-18-0158.1.
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    • Physical Oceanography (PO)
    Suggested Citation
    Densmore, C. R., Sanabia, E. R., & Barrett, B. S. (2019). QBO influence on MJO amplitude over the Maritime Continent: Physical mechanisms and seasonality. Monthly Weather Review, 147(1), 389-406.
     

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