行星尺度阻塞波和天气尺度波相互作用的数值模拟  

Numerical Simulation of Interaction Between Planetary-Scale Waves and Synoptic-Scale Waves

作　　者：姜智娜[1] 罗德海[1] 刁一娜[1] 

机构地区：[1]中国海洋大学海洋环境学院,山东青岛266003

出　　处：《中国海洋大学学报（自然科学版）》2005年第6期895-899,共5页Periodical of Ocean University of China

基　　金：国家杰出青年科学基金项目(40325016)资助

摘　　要：用数值方法研究了行星尺度阻塞波和天气尺度波之间的相互作用,得到在涡源强迫下,当不存在地形时,大尺度流场可发展成偶极型阻塞,瞬时流场分裂成南北对称的2支,总流场可以看到明显的多涡结构;加上双波地形后,大尺度流场发展成Ω型阻塞,瞬时流场同样分裂成2支,但北支要明显强于南支。而且通过一系列对比试验发现,适当的弱的基本西风气流是阻塞发生的有利条件。此外,讨论了初始阻塞和造波器(扰动源)位置的配置,以及造波器关闭时间的不同对阻塞强度和生命周期的可能影响。Numerical experiments of barotropic interaction between planetary-scale blocking waves and synoptic-scale waves were conducted. It is found that with vorticity forcing and without topography, the planetaryscale field develops into a dipole blocking pattern, at the same time the synoptic-scale field splits into two symmetrical branches. While with vorticity forcing and topography, the planetary-scale field develops into an Ω blocking pattern, at the same time the synoptic-scale field also splits into two branches, of which the northern branch is stronger. In addition, the results reveal that weak basic westerly is favorable for the blocking to occur. The setting and the different stopping times of the wave- maker may explain the difference in the life cycle of blocking and its intensity.

关 键 词：行星尺度阻塞波 天气尺度波 偶极型阻塞 Ω型阻塞 造波器 

分 类 号：P732.7[天文地球—海洋科学]