摘要
本文从理论分析、资料诊断和正压模式数值试验三个方面研究了瞬变的涡度通量的辐合与辐散风产生的涡度源之间的关系及它们在对流层上层定常波维持中的作用。结果表明，瞬变涡度通量的辐合对辐散风产生的涡度源有抵消或耗散的趋势；定常波是在两种强迫力的共同作用下维持的。同时还研究了不同地区散度场对定常波的作用，结果表明，中纬度东亚地区的辐合场对维持东亚大槽是重要的。
The relationship of the convergence of transient vorticity fluxes and the vorticity sources generated by divergent wind, and their forcings to the upper troposphere stationary waves are studied with theoretical analysis, data diagnostics and barotropic model experiments. It is found that the convergences of transient vorticity fluxes tend to cancel or dissipate the vorticity sources generated by divergent wind. Both of these forcings are important to the maintenance of stationary waves. Meanwhile the roles of the divergences in different regions to the maintenance of stationary waves are also investigated. The results show that the convergence over mid latitude East Asia is important to the maintenance of East Asia trough. This convergence together with the strong divergence over Indonesia are the main forcings of the subtropical western Pacific anticyclone.
出处
《大气科学》
CSCD
北大核心
1997年第1期73-82,共10页
Chinese Journal of Atmospheric Sciences
关键词
辐散风
涡度通量
强迫
定常波
热带气旋
divergent wind transient vorticity flux stationary wave forcing
