Geographical Dependence of Upper-Level Blocking Formation Associated with Intraseasonal Amplification of the Siberian High
Geographical Dependence of Upper-Level Blocking Formation Associated with Intraseasonal Amplification of the Siberian High
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DOI：
10.1175/jas3628.1
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发表时间：
2005-12
影响因子：
3.1
通讯作者：
K. Takaya;H. Nakamura
中科院分区：
文献类型：
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作者：
K. Takaya;H. Nakamura
冬季西伯利亚高压的季节内放大事件通常与对流层上部阻塞脊的形成有关。对西伯利亚上空各格点20次最强的高空反气旋异常季节内事件的合成分析表明，远东上空高空气候槽东西两侧的阻塞结构有根本的不同。向西，可以被称为“波列（南极起源）”的类型是常见的，其中阻塞脊是由异常发展而来的，作为准静止Rossby波列的一个组成部分，在短暂涡旋的适度反馈强迫下传播穿过欧亚大陆。在低压槽以东，可称为“太平洋起源”型占主导地位，在太平洋风暴轴的较强反馈强迫下，北太平洋反气旋异常向西发展，形成阻塞脊。无论是哪种类型的BL...
Abstract 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 bl...