Dynamics of teleconnections and Walker circulations forced by equatorial heating
Dynamics of teleconnections and Walker circulations forced by equatorial heating
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DOI：
10.1175/1520-0469(1983)040
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发表时间：
1983-08
影响因子：
3.1
通讯作者：
Hock Lim;Chih-Pei Chang
中科院分区：
文献类型：
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作者：
Hock Lim;Chih-Pei Chang
摘要：利用赤道β平面上具有恒定平均风的线性化模型，通过本征模分析研究了大气对稳定热带强迫的两种响应类型。第一种是旋转约束较小的“正压”运动，它显示出了Bjerknes（1966年）以及Horel和Wallace（1981年）所观测到的遥相关模式的一些特征。第二种是旋转约束更强、暖核的深层斜压运动，类似于沃克环流。该分析揭示了先前建模研究中的几个重要不足之处，并对这两种运动的动力学提供了相对全面的解释。垂直正则模的考虑表明，正压型运动很难通过内部加热激发。在许多先前的数值建模研究中被忽略的地表加热，被发现对于直接强迫这种类型的运动是重要的。此外，大的相当深度可能的贡献……
Abstract Using a linearized model with constant mean wind on an equatorial β-plane, two types of atmospheric response to steady tropical forcing are studied by an eigenmode analysis. The first type is the less rotationally trapped “barotropic” motions which show some of the characteristics of the teleconnection patterns observed by Bjerknes (1966) and Horel and Wallace (1981). The second type is the more rotationally trapped, warm-core, deep baroclinic motions which resemble the Walker circulations. The analysis reveals several important inadequacies in previous modeling studies and provides a relatively comprehensive explanation of the dynamics of both types of motions. A vertical normal mode consideration shows that the barotropic-type motions are difficult to excite by internal beating. Surface heating, which has been neglected in many previous numerical modeling studies, is found to be important in directly forcing this type of motion. Furthermore, the possible contribution by large equivalent depth i...