Centered Composite Analysis of Variations Associated with the Madden–Julian Oscillation

Centered Composite Analysis of Variations Associated with the Madden–Julian Oscillation
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与马登-朱利安振荡相关的变异的中心综合分析

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发表时间：
2006
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影响因子：
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通讯作者：
B. Weare
B. Weare
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文献类型：
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作者：
B. Weare

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摘要描述了中心合成分析，并将其应用于更好地理解Madden-Julian振荡（MJO）的初始相位。中心复合分析确定关键事件的日期和中心位置。在计算平均值之前，复合平均值的元素以这些中心位置为中心。通过这种方式，消除了传统复合分析中固有的空间模糊性。MJO的结果，基于MJO过滤出射长波辐射的参考数据和40年的ECMWF再分析（ERA-40）和NCEP-NCAR再分析产品的复合材料，显示高度显着的复合材料的未过滤的数据不仅零滞后，但也滞后到20天前的目标事件。这些复合材料确定传播模式的表面压力，上，下对流层纬向风，表面温度和850百帕特定湿度与MJO在印度洋的对流事件。传播特性
Abstract Centered composite analysis is described and applied to gain a better understanding of the initial phases of the Madden–Julian oscillation (MJO). Centered composite analysis identifies the dates and central locations of key events. The elements of the composite means are centered on these central locations before averages are calculated. In this way much of the spatial fuzziness, which is inherent in traditional composite analysis, is removed. The results for the MJO, based on MJO-filtered outgoing longwave radiation for the reference data and 40-yr ECMWF Re-Analysis (ERA-40) and NCEP–NCAR reanalysis products for the composites, show highly significant composites of unfiltered data for not only zero lag, but also lags back to 20 days before the target events. These composites identify propagating patterns of surface pressure, upper- and lower-troposphere zonal winds, surface temperature, and 850-hPa specific humidity associated with MJO convective events in the Indian Ocean. The propagation chara...