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首页> 外文期刊>Journal of Climate >Barrier Effect on MJO Propagation by the Maritime Continent in the MJO Task Force/GEWEX Atmospheric System Study Models
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Barrier Effect on MJO Propagation by the Maritime Continent in the MJO Task Force/GEWEX Atmospheric System Study Models

机译：MJO工作组中的MJO大陆MJO传播的障碍效应/ GEWEX大气系统研究模型

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摘要

The simulated Madden-Julian oscillation (MJO) events in 27 general circulation models (GCMs) are identified using an MJO tracking method. The results suggest that the occurrence frequencies of simulated MJO events can represent a model's ability to simulate several characteristics of the MJO to a certain extent during boreal winter, such as propagation range, strength, and termination longitude. All tracked MJO events are classified into those that propagate through the Maritime Continent (MC) (MJO-C) and those that do not (MJO-B), and the weakening and blocking effects on MJO propagation by the MC in GCMs were quantified. In general, if a GCM shows a stronger weakening effect on MJO strength over the MC, it tends to produce a stronger blocking effect on MJO propagation over the MC during boreal winter. The barrier effect of the MC on MJO propagation is exaggerated in most GCMs, while it can be underestimated in some GCMs, especially the coupled GCMs. Strong lower-tropospheric premoistening is identified ahead of the MJO convection center when it is over the central MC for MJO-C but not for MJO-B in most GCMs. Such strong premoistening is mainly attributed to the zonal gradient of lower-tropospheric easterly anomalies within the front Walker cell, which could be a precursor leading to the eastward propagation of MJO convection. In contrast to the observation, the role of the background sea surface temperature and land-sea precipitation contrast in the barrier effect on MJO propagation by the MC is not well captured by most GCMs.
机译：使用MJO跟踪方法识别了27个一般循环模型（GCMS）中的模拟的Madden-julian振荡（MJO）事件。结果表明，模拟MJO事件的发生频率可以表示模型在冬季冬季期间在一定程度上模拟MJO的几种特征的能力，例如传播范围，强度和终止经度。所有追踪的MJO事件都分为通过海洋大陆（MC）（MJO-C）和不（MJO-B）的那些传播的事件，以及MC在GCMS中MC的MJO传播的弱化和阻断效应。通常，如果GCM对MC上的MJO强度呈现出更强的弱化影响，则倾向于在北冬MJ在MC上产生更强的阻塞效果。 MC对MJO传播的屏障效应在大多数GCM中夸大了，而可以在一些GCM中低估，尤其是耦合的GCM。当MJO-C中央MC上时，在MJO对流中心之前，在MJO-C中的MJO-B上方而不是MJO-B中的MJO对流中心，确定了强大的下部对流层预热。这种强大的前静脉主要归因于前漫游电池内的下层逆向体异常的区域梯度，这可能是导致MJO对流的东方传播的前体。与观察结果相比，MC由MC对MJO传播的屏障效应中的背景海面温度和陆海沉淀对比的作用并不是大多数GCM的捕获。

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