2005年冬季南极极涡研究
Study of the winter 2005 Antarctica polar vortex
摘要：
在冬季和春季，南极洲上空高海拔（对流层上层和平流层）的气流主要是以大陆上空为中心的涡旋。它通常从8月持续到11月。这个涡旋的特征是在极地高压上方有一个强的气旋性急流。在我们小组最近的一项研究中（Hagelin等人，2008）对南极内部高原4个不同地点（南极点、冰穹C、冰穹A和冰穹F）的观测结果进行了分析，提出了高层大气风速强度与地点到南极极涡中心的距离有关的假设。从天文点的角度来看，这种高空风是非常重要的，因为它可能触发光学湍流的开始，并强烈影响其他光学湍流参数。这里我们感兴趣的是定位高空风速最小值的位置，以证实Hagelin等人（2008）的假设。
英文摘要：
During winter and springtime, the flow above Antarctica at high altitude (upper troposphere and stratosphere) is dominated by the presence of a vortex centered above the continent. It lasts typically from August to November. This vortex is characterized by a strong cyclonic jet centered above the polar high. In a recent study of our group (Hagelin et al., 2008) of four different sites in the Antarctic internal plateau (South Pole, Dome C, Dome A and Dome F), it was made the hypothesis that the wind speed strength in the upper atmosphere should be related to the distance of the site to the center of the Antarctic polar vortex. This high altitude wind is very important from an astronomical point of view since it might trigger the onset of the optical turbulence and strongly affect other optical turbulence parameters. What we are interested in here is to localize the position of the minimum value of the wind speed at high altitude in order to confirm the hypothesis of Hagelin et al. (2008).
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