Perspicacious indicators of atmospheric blocking
Perspicacious indicators of atmospheric blocking
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DOI：
10.1029/2003gl019341
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发表时间：
2004-03
影响因子：
5.2
通讯作者：
C. Schwierz;M. Croci‐Maspoli;H. Davies
中科院分区：
文献类型：
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作者：
C. Schwierz;M. Croci‐Maspoli;H. Davies
介绍了一种新的基于动态的方法来识别，描述和诊断大气阻塞事件。该方法是基于位涡的角度来看，并考虑到三维结构的现象。有人认为，阻塞异常的本质是位于对流层上部，对流层顶之下。相关的新阻塞指标来自6小时时间分辨率的二维场，并提供有关块体的空间尺度、形状、幅度和运动的信息。本文给出了ERA 15期（1979-1993年）的北方冬季（DJF）气候，并对阻塞指数与以往阻塞指数之间的关系作了评述。
A novel dynamically‐based approach is introduced to identify, describe and diagnose atmospheric blocking events. The approach is based upon the potential vorticity perspective and takes into account the three‐dimensional structure of the phenomenon. It is argued that the essence of a blocking anomaly is located in the upper troposphere, just below the tropopause. The associated novel blocking indicators are derived from two‐dimensional fields at 6‐hourly temporal resolution, and provide information on the spatial scale, shape, amplitude and movement of blocks. A northern hemisphere winter (DJF) climatology for the ERA15 period (1979–1993) is presented and comments are made on the relationship between the indicators and previous blocking indices.