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    EOF Representations of the Madden–Julian Oscillation and Its Connection with ENSO

    Source: Journal of Climate:;2001:;volume( 014 ):;issue: 013::page 3055
    Author:
    Kessler, William S.
    DOI: 10.1175/1520-0442(2001)014<3055:EROTMJ>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: Although recent El Niño events have seen the occurrence of strong intraseasonal winds apparently associated with the Madden?Julian oscillation (MJO), the usual indices of interannual variability of the MJO are uncorrelated with measures of the ENSO cycle. An EOF decomposition of intraseasonal outgoing longwave radiation and zonal wind identifies two modes of interannual variability of the MJO: a zonally stationary variation of amplitude that is unrelated to ENSO and a roughly 20°-longitude eastward extension of the MJO envelope during El Niño events. The stationary mode is represented by the first two EOFs, which form the familiar lag-correlated quadrature pair, and the eastward-extending mode is represented by the third EOF, which is usually ignored although it is statistically significant. However, the third EOF also has a systematic phase relation with the first pair, and all three should be considered as a triplet; rotating the EOFs makes the phase relation clear. The zonal shift represents about 20% of total MJO variance (which itself is about 55% of intraseasonal variance over the tropical strip). Although the eastward shift is small when compared with the global scale of the MJO, it produces a large proportional shift of MJO activity over the open Pacific, where physical interactions with ENSO processes can occur.
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      EOF Representations of the Madden–Julian Oscillation and Its Connection with ENSO

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4198867
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    contributor authorKessler, William S.
    date accessioned2017-06-09T15:59:54Z
    date available2017-06-09T15:59:54Z
    date copyright2001/07/01
    date issued2001
    identifier issn0894-8755
    identifier otherams-5842.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4198867
    description abstractAlthough recent El Niño events have seen the occurrence of strong intraseasonal winds apparently associated with the Madden?Julian oscillation (MJO), the usual indices of interannual variability of the MJO are uncorrelated with measures of the ENSO cycle. An EOF decomposition of intraseasonal outgoing longwave radiation and zonal wind identifies two modes of interannual variability of the MJO: a zonally stationary variation of amplitude that is unrelated to ENSO and a roughly 20°-longitude eastward extension of the MJO envelope during El Niño events. The stationary mode is represented by the first two EOFs, which form the familiar lag-correlated quadrature pair, and the eastward-extending mode is represented by the third EOF, which is usually ignored although it is statistically significant. However, the third EOF also has a systematic phase relation with the first pair, and all three should be considered as a triplet; rotating the EOFs makes the phase relation clear. The zonal shift represents about 20% of total MJO variance (which itself is about 55% of intraseasonal variance over the tropical strip). Although the eastward shift is small when compared with the global scale of the MJO, it produces a large proportional shift of MJO activity over the open Pacific, where physical interactions with ENSO processes can occur.
    publisherAmerican Meteorological Society
    titleEOF Representations of the Madden–Julian Oscillation and Its Connection with ENSO
    typeJournal Paper
    journal volume14
    journal issue13
    journal titleJournal of Climate
    identifier doi10.1175/1520-0442(2001)014<3055:EROTMJ>2.0.CO;2
    journal fristpage3055
    journal lastpage3061
    treeJournal of Climate:;2001:;volume( 014 ):;issue: 013
    contenttypeFulltext
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