摘要
采用平流层准地转－β通道近似下的波流相互作用模型，考虑大气行星波１和波２与流的相互作用，以平流层底部边界强迫波波１和波２的振幅作为参数，对该模型的分岔特性进行了研究．结果表明，系统具有稳态解支Ａ，Ｂ，Ｃ，在某些参数范围内，多种稳态解同时存在．解支Ａ对应于平流层冷冬状态，解支Ｃ对应于平流层增温状态．由于参数变化系统在稳态解Ａ和Ｃ之间发生灾变是冬季平流层暴发性增温的原因．文中给出了二维参数空间中的分岔集，它表明了对流层顶的波动对平流层暴发性增温的控制作用，能很好地解释观测事实．
The bifurcation properties of a stratospheric vacillation model, which describethe interactios among planetary wave 1, planetary wave 2 and mean flow in a quasigeostrophic and β-channel approximation, are investigated. The amplitudes of forcing wave 1 and forcing wave 2 at the bottom boundary are taken as bifurcation parameters. Results show that there exist multi-equilibria within some parameter ranges and the jump between steady solutions due to changes of parameters, might be an explanation of the stratospheric sudden warmings. The presented bifurcation set in the two parameter space shows the control rolls of forcing waves at the tropespheric pause on the Sudden Stratospheric Warmings and provides a way to interpret planetary wave 1 warmings and planetary wave 2 warmings.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
1996年第2期169-177,共9页
Chinese Journal of Geophysics
基金
国家自然科学基金
关键词
波流相互作用
平流层
暴发性增温
对流层
Wave-mean flow interactions, Bifurcation set, Sudden stratospheric warmings.
