The Gravity Wave Arctic Stratospheric Vortex Interaction.
The Gravity Wave Arctic Stratospheric Vortex Interaction.
复制标题
重力波北极平流层涡旋相互作用。
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
A. Carswell
中科院分区：
文献类型：
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作者：
T. Duck;J. Whiteway;A. Carswell
摘要1992/93年至1997/98年，在北极高纬度地区的尤里卡（80°N，86°W），用瑞利激光雷达在6个冬季观测活动中获得了422个夜晚的平流层重力波观测资料。这些测量值按相对于北极平流层涡旋的位置分组，以供比较。12月中旬以前，在低涡核心、低涡外围和低涡喷流中都有较低的重力波活动。高重力波活动仅在12月下旬以后的涡旋急流中发现，并且与急流的加强和临界水平过滤的减少有关。计算表明，12月下旬重力波能量增加引起的阻力驱动了已经在涡核中观察到的变暖，从而降低了涡喷风速。重力波提供了一种反馈机制，调节北极平流层涡旋的强度。
Abstract Four hundred and twenty-two nights of stratospheric gravity wave observations were obtained with a Rayleigh lidar in the High Arctic at Eureka (80°N, 86°W) during six wintertime measurement campaigns between 1992/93 and 1997/98. The measurements are grouped in positions relative to the arctic stratospheric vortex for comparison. Low gravity wave activity is found in the vortex core, outside of the vortex altogether, and in the vortex jet before mid-December. High gravity wave activity is only found in the vortex jet after late December, and is related to strengthening of the jet and decreased critical-level filtering. Calculations suggest that the drag induced by the late-December gravity wave energy increases drives a warming already observed in the vortex core, thereby reducing vortex-jet wind speeds. The gravity waves provide a feedback mechanism that regulates the strength of the arctic stratospheric vortex.