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    Some Climatological Aspects of the Madden–Julian Oscillation (MJO)

    Source: Journal of Climate:;2015:;volume( 028 ):;issue: 015::page 6039
    Author:
    Lafleur, Donald M.
    ,
    Barrett, Bradford S.
    ,
    Henderson, Gina R.
    DOI: 10.1175/JCLI-D-14-00744.1
    Publisher: American Meteorological Society
    Abstract: ne of the most commonly used metrics for both locating the Madden?Julian oscillation (MJO) geographically and defining the intensity of MJO convective activity is the real-time multivariate MJO (RMM) index. However, a climatology of the MJO, particularly with respect to the frequency of activity levels or of consecutive days at certain activity thresholds, does not yet exist. Thus, several climatological aspects of the MJO were developed in this study: 1) annual and 2) seasonal variability in MJO intensity, quantified using four defined activity categories (inactive, active, very active, and extremely active); 3) persistence in the above-defined four categories; 4) cycle length; and 5) low-frequency (decadal) variability.On an annual basis, MJO phases 1 and 2 occurred more often, and phase 8 occurred less often, than the other phases throughout the year. Notable seasonality was also found, particularly in the frequency of extremely active MJO in March?May (8% of days) compared with June?August (only 1% of days). The MJO was persistent in time and across intensity categories, and all activity categories the following day had at least an 80% chance of maintaining their amplitudes. Implications of this climatology are discussed, including length of complete MJO cycles (the shortest of which was 17 days) and correlations between MJO amplitude and atmospheric response.
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      Some Climatological Aspects of the Madden–Julian Oscillation (MJO)

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    contributor authorLafleur, Donald M.
    contributor authorBarrett, Bradford S.
    contributor authorHenderson, Gina R.
    date accessioned2017-06-09T17:11:37Z
    date available2017-06-09T17:11:37Z
    date copyright2015/08/01
    date issued2015
    identifier issn0894-8755
    identifier otherams-80884.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4223825
    description abstractne of the most commonly used metrics for both locating the Madden?Julian oscillation (MJO) geographically and defining the intensity of MJO convective activity is the real-time multivariate MJO (RMM) index. However, a climatology of the MJO, particularly with respect to the frequency of activity levels or of consecutive days at certain activity thresholds, does not yet exist. Thus, several climatological aspects of the MJO were developed in this study: 1) annual and 2) seasonal variability in MJO intensity, quantified using four defined activity categories (inactive, active, very active, and extremely active); 3) persistence in the above-defined four categories; 4) cycle length; and 5) low-frequency (decadal) variability.On an annual basis, MJO phases 1 and 2 occurred more often, and phase 8 occurred less often, than the other phases throughout the year. Notable seasonality was also found, particularly in the frequency of extremely active MJO in March?May (8% of days) compared with June?August (only 1% of days). The MJO was persistent in time and across intensity categories, and all activity categories the following day had at least an 80% chance of maintaining their amplitudes. Implications of this climatology are discussed, including length of complete MJO cycles (the shortest of which was 17 days) and correlations between MJO amplitude and atmospheric response.
    publisherAmerican Meteorological Society
    titleSome Climatological Aspects of the Madden–Julian Oscillation (MJO)
    typeJournal Paper
    journal volume28
    journal issue15
    journal titleJournal of Climate
    identifier doi10.1175/JCLI-D-14-00744.1
    journal fristpage6039
    journal lastpage6053
    treeJournal of Climate:;2015:;volume( 028 ):;issue: 015
    contenttypeFulltext
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