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首页> 外文期刊>Oceanographic Literature Review >The moist entropy budget of terminating Madden-Julian oscillation events
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The moist entropy budget of terminating Madden-Julian oscillation events

机译：终止Madden-Julian振荡事件的潮湿熵预算

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摘要

Recent studies have examined moist entropy (ME) as a proxy for moist static energy (MSE) and the relative role of the underlying processes responsible for changes in ME that potentially affect MJO propagation. This study presents an analysis of the intrase-asonally varying (ISV) ME anomalies throughout the lifetime of observed MJO events. A climatology of continuing and terminating MJO events is created from an event identification algorithm using common tracking indices including the OLR-based MJO index (OMI), filtered OMI (FMO), real-time multivariate MJO (RMM), and velocity potential MJO (VPM) index. ME composites for all indices show a statistically significant break in the wavenumber-1 oscillation at day 0 for terminating events in nearly all domains except RMM phase 6 and phase 7. The ME tendency is decomposed into horizontal and vertical advection, sensible and latent heat fluxes, and shortwave and longwave radiative fluxes using ERA-Interim data. The relative role of each processes toward the eastward propagation is discussed as well as their effects on MJO stabilization. Statistically significant differences occur for all terms by day 210. A domain sensitivity test is performed where eastward propagation is favored for vertical advection given a larger, asymmetric domain for continuing events. A reduced eastward propagation from vertical advection is evident 2-3 days before similar differences in horizontal advection for terminating events. The importance of horizontal advection for the eastward propagation of the MJO is discussed in addition to the relative destabilization from vertical advection in the convectively suppressed region downstream of future terminating MJOs.
机译：最近的研究已经检查了潮湿的熵（ME）作为潮湿的静态能量（MSE）的代理，以及负责对我的变化的潜在过程的相对作用可能影响MJO传播。本研究介绍了在观察到的MJO事件的终身过程中初始变化（ISV）的异常分析。通过使用基于OLR的MJO索引（OMI），过滤的OMI（FMO），实时多变量MJO（RMM）和速度潜在MJO（速度）MJO（ vpm）索引。我的所有指数的复合材料在第0天显示波数-1振荡中的统计上显着的断裂，以终止除RMM阶段6和第7阶段之外的几乎所有领域。ME倾向分解成水平和垂直的平流，明智和潜热通量和使用ERA临时数据的短波和长波辐射通量。讨论了每个过程对东方传播的相对作用以及它们对MJO稳定化的影响。在第210天，所有术语发生统计学上的显着差异。在给予向东传播的垂直前进时，执行域敏感性测试，给予较大，不对称的域进行持续的事件。从垂直平流的向东传播减少了2-3天，以便在终止事件的水平平流方面的类似差异之前。除了在未来终止MJO下游的对流抑制区域中的垂直平流中的相对稳定化之外，还讨论了对MJO向东传播的横向平流的重要性。

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  • 来源
    《Oceanographic Literature Review》 |2021年第6期|1225-1225|共1页
  • 作者

    B. Chrisler; J.P. Stachnik;

  • 作者单位

    Department of Geography and Atmospheric Science University of Kansas Lawrence KS United States;

    Department of Geography and Atmospheric Science University of Kansas Lawrence KS United States;

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  • 正文语种 eng
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