变形CISK-Rossby波和低频振荡

北京大学学报（自然科学版）

变形CISK-Rossby波和低频振荡

陈建洲^1,2,赵强¹

1. 北京大学物理学院大气与海洋科学系, 北京 100871; 2. 中国民用航空局空中交通管理局航空气象中心, 北京 100122;

收稿日期:2013-03-26 出版日期:2014-03-20 发布日期:2014-03-20

Modified CISK-Rossby Waves and Low-Frequency Oscillations

CHEN Jianzhou^1,2, ZHAO Qiang¹

1. Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871; 2. Aviation Meteorological Center, Air Traffic Management Bureau of CAAC, Beijing 100122;

Received:2013-03-26 Online:2014-03-20 Published:2014-03-20

摘要/Abstract

摘要： 建立一个包含三维Coriolis力加速度以及CISK机制的斜压半地转动力学模式, 引入反映非传统Coriolis力项的f ′和反映CISK加热的无量纲参数η, 求得模式系统的变形CISK-Rossby波解。动力分析和数值计算的结果进一步说明变形CISK-Rossby 波是激发和驱动热带大气低频振荡的重要物理过程。

关键词: 非传统Coriolis力项, CISK机制, 低频振荡

Abstract: A baroclinic semi-geostrophic model with the full, three-dimensional Coriolis acceleration and CISK mechanism is established, f ′ and the non-dimensional parameter η are introduced to represent the nontraditional Coriolis terms and CISK heating, respectively. The modified CISK-Rossby wave solutions of the model are obtained. Dynamics analyses and numerical calculations further confirm that the modified CISK-Rossby waves are very important physical processes in leading to the low-frequency oscillations (LFO) in the tropics.

Key words: nontraditional Coriolis terms, CISK mechanism, LFO

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