中文摘要：

用 ECWMF ERA-40 和过渡分析数据，与 2 月极端同温层的极的旋涡联系的行星的波浪流动被学习。用是的三维的Eliassen手掌( EP )流动波浪活动繁殖的一项措施，作者证明在北极的不平常的温暖的年展示联合的一个异常弱平流层对流层并且弱向下在更低的平流层挥动流动，特别在北美洲和诺思大西洋(护士)区域上。极其冷的年被联合的强壮的平流层对流层描绘并且强壮向下在这个区域挥动流动。折射索引被用来检验行星的波浪思考的概念，它显示出一个大折射索引(低思考) 极其温暖的年和一个小折射索引(高思考) 极其冷的年。这研究为在 2 月解释同温层的极的旋涡的不平常的状态从平流层揭示向下行星的波浪繁殖的重要性到对流层。

英文摘要：

Using ECWMF ERA-40 and Interim reanalysis data, the planetary wave fluxes associated with the February extreme stratospheric polar vortex were studied. Using the three-dimensional Eliassen-Palm （EP） flux as a measure of the wave activity propagation, the authors show that the unusual warm years in the Arctic feature an anomalous weak stratosphere-troposphere coupling and weak downward wave flux at the lower stratosphere, especially over the North America and North Atlantic （NANA） region. The extremely cold years are characterized by strong stratosphere-troposphere coupling and strong downward wave flux in this region. The refractive index is used to examine the conception of planetary wave reflection, which shows a large refractive index （low reflection） for the extremely warm years and a small refractive index （high reflection） for the extremely cold years. This study reveals the importance of the downward planetary wave propagation from the stratosphere to the troposphere for explaining the unusual state of the stratospheric polar vortex in February.