The Role of Synoptic Waves in the Formation and Maintenance of the Western Hemisphere Circulation Pattern
The Role of Synoptic Waves in the Formation and Maintenance of the Western Hemisphere Circulation Pattern
复制标题
天气波在西半球环流格局形成和维持中的作用
DOI：
10.1175/jcli-d-17-0158.1
复制
发表时间：
2017
影响因子：
4.9
通讯作者：
Paulo Ceppi
中科院分区：
文献类型：
--
作者：
Xin Tan;Ming Bao;Dennis L. Hartmann;Paulo Ceppi
摘要：先前的研究表明，NAO是北大西洋大气低频变率的主要模式，它可以通过天气波的下游传播与东北太平洋气候变率相关。在这些研究中，NAO 和东北太平洋气候变率被认为是两种独立的模式，分别解释北大西洋区域和东太平洋-北美区域的变化。新发现的低频大气状况——西半球（WH）环流模式——提供了解释整个北大西洋-北美-北太平洋区域变化的变化模式的独特例子。使用 ECMWF 再分析数据集研究了天气波在 WH 模式的形成和维持中的作用。持续性 WH 事件的特点是准稳态罗斯比波在北太平洋-北美-北大西洋地区的传播以及相关的...
AbstractPrevious studies have demonstrated that the NAO, the leading mode of atmospheric low-frequency variability over the North Atlantic, could be linked to northeast Pacific climate variability via the downstream propagation of synoptic waves. In those studies, the NAO and the northeast Pacific climate variability are considered as two separate modes that explain the variance over the North Atlantic sector and the east Pacific–North American sector, respectively. A newly identified low-frequency atmospheric regime—the Western Hemisphere (WH) circulation pattern—provides a unique example of a mode of variability that accounts for variance over the whole North Atlantic–North American–North Pacific sector. The role of synoptic waves in the formation and maintenance of the WH pattern is investigated using the ECMWF reanalysis datasets. Persistent WH events are characterized by the propagation of quasi-stationary Rossby waves across the North Pacific–North American–North Atlantic regions and by associated s...