MJO Initiation in the Real-Time Multivariate MJO Index
MJO Initiation in the Real-Time Multivariate MJO Index
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DOI：
10.1175/jcli-d-12-00074.1
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发表时间：
2013-02
影响因子：
4.9
通讯作者：
K. Straub
中科院分区：
文献类型：
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作者：
K. Straub
通过对观测到的个例研究和复合事件的分析，探讨了实时多变量MJO（RMM）指数中MJO的启动。具体的例子表明，无论是MJO开始的日期和存在的MJO本身可以有很大的不同，在几个著名的MJO指数，这取决于重点是对流或环流。复合材料的“初级”MJO启动事件中，RMM指数迅速增加的振幅从一个非MJO状态的MJO状态，并补充了两个案例研究，从1985/86年冬季。结果表明，在印度洋（RMM第1阶段）的主要MJO启动事件，缓慢向东传播的850百帕（200百帕）东风（西风）异常在印度洋之前放大的RMM指数至少10天，而抑制对流在西太平洋之前放大5天。这些“本地”东半球的prede.
AbstractMadden–Julian oscillation (MJO) initiation in the real-time multivariate MJO (RMM) index is explored through an analysis of observed case studies and composite events. Specific examples illustrate that both the dates of MJO initiation and the existence of the MJO itself can vary substantially among several well-known MJO indices, depending on whether the focus is on convection or circulation. Composites of “primary” MJO initiation events in which the RMM index rapidly increases in amplitude from a non-MJO state to an MJO state are presented and are supplemented by two case studies from the 1985/86 winter season. Results illustrate that, for primary MJO initiation events in the Indian Ocean (RMM phase 1), slowly eastward-propagating 850-hPa (200 hPa) easterly (westerly) anomalies over the Indian Ocean precede the amplification of the RMM index by at least 10 days, while suppressed convection over the western Pacific Ocean precedes the amplification by 5 days. These “local” Eastern Hemispheric prede...