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首页> 外文期刊>Journal of the Atmospheric Sciences >Geographical dependence of upper-level blocking formation associated with intraseasonal amplification of the Siberian high
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Geographical dependence of upper-level blocking formation associated with intraseasonal amplification of the Siberian high

机译：西伯利亚高压季节内放大相关的上层阻塞形成的地理依赖性

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摘要

Intraseasonal amplification events of the surface Siberian high in winter are generally associated with blocking ridge formation in the upper troposphere. Composite analysis applied to the 20 strongest intraseasonal events of upper-level anticyclonic anomalies at every grid point over Siberia reveals that the blocking formation differs fundamentally between the east and west of the climatological upper-level trough over the Far East. To the west, what can be called "wave-train (Atlantic-origin)" type is common, where a blocking ridge develops from anomalies as a component of a quasi-stationary Rossby wave train propagating across the Eurasian continent under modest feedback forcing from transient eddies. To the east of the trough, what can be called " Pacific-origin" type dominates, where a blocking ridge forms in association with westward development of anticyclonic anomalies from the North Pacific under stronger feedback forcing from the Pacific storm track. Regardless of a particular type of blocking formation in the upper troposphere, a cold air outbreak tends to occur once anomalously cold air reaches the northeastern slope of the Tibetan Plateau.
机译：冬季冬季西伯利亚表层的季节内放大事件通常与阻塞对流层上部的山脊形成有关。在西伯利亚每个网格点对上层反气旋异常的20个最强烈的季节内事件进行的综合分析表明，远东气候高层槽的东部和西部之间的阻塞形成根本不同。在西方，所谓的“波列（大西洋起源）”型很常见，在这种情况下，由于来自适度的反馈力而在欧亚大陆传播的准平稳的罗斯比波列的一部分，由异常形成了阻塞脊。短暂的漩涡。在海槽的东面，主要是所谓的“太平洋起源”型，在太平洋风暴轨迹的强烈反馈强迫下，与北太平洋反气旋异常的向西发展相关联，形成了一个阻塞脊。不管对流层上的阻塞形成的特殊类型如何，一旦异常的冷空气到达青藏高原的东北坡，就会发生冷空气爆发。

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