A modified zonal index and its physical sense
A modified zonal index and its physical sense
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DOI：
10.1029/2003gl017441
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发表时间：
2003-06-24
影响因子：
5.2
通讯作者：
Wang, JLXL
中科院分区：
文献类型：
--
作者：
Li, JP;Wang, JLXL
修正的北方半球（NH）大气环流纬向指数（ZI）被定义为35 ° N和65 ° N之间纬向平均海平面气压异常的归一化差。ZI是一种测量中高纬度两个环形作用带（ABAs）之间的半球范围内空气质量波动的方法，分别集中在北纬35度和北纬65度附近。北半球大气环流的空间结构是一种纬向对称型，类似于北半球环形模。分析表明，在与ZI相关的纬向平均环流异常中，Ferrel环流圈是一个显著的信号，它反映了中高纬度大气环流的强动力学特征。
A modified zonal index (ZI) for the Northern Hemisphere (NH) general circulation is defined as the normalized difference in zonal-averaged sea level pressure anomalies between 35degreesN and 65degreesN. The ZI is a measure of hemispheric-wide fluctuations in air mass between two annular belts of action (ABAs) over middle and high latitudes, centered near 35degreesN and 65degreesN, respectively. The spatial structure of the NH general circulation represented by the ZI is a zonally symmetric pattern, similar to the NH annular mode. Some physical features associated with the ZI are discussed and summarized as a concept model, and the analysis indicates that the Ferrel cell stands out as a dominant signal in the zonal-mean circulation anomalies related to the ZI, implying a strong dynamical property of the general circulation in the mid-high latitudes.