CIRRUS CANOPIES IN TROPICAL STORMS
CIRRUS CANOPIES IN TROPICAL STORMS
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热带风暴中的卷云檐篷
DOI：
10.1175/1520-0493(1967)095
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发表时间：
1967
期刊：
影响因子：
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通讯作者：
R. Wexler
中科院分区：
文献类型：
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作者：
E. S. Merritt;R. Wexler
本文分析了热带风暴中卷云冠层的生成、平流和消散过程，着重讨论了锐边的形成。虽然沉降和伴随的蒸发可能是因素，但这种形成与边缘附近的风流动模式密切相关。边缘附近的径向风速越强，在足够短的距离内蒸发云所需的沉降速率就越大，因此边缘可以被认为是尖锐的。对典型飓风风场的分析表明，在眼壁产生并向外平流的卷云可以在12至18小时内产生类似于气象卫星观测到的冠层。此外，如果在旋臂中发生生成，则这些时间稍微缩短。锐缘出现在径向流出量变小的区域，可能小于1 m。sec.−1，其中切向速度处于相对最大值。
Abstract An analysis is made of the generation, advection, and dissipation processes of the cirrus canopy in tropical storms with particular emphasis on the formation of sharp edges. Although subsidence and accompanying evaporation may be factors, this formation is closely tied with the wind flow pattern near the edges. The stronger the radial wind velocity in the vicinity of the edges, the greater is the rate of subsidence required to evaporate the cloud over a distance sufficiently short so that the edge may be considered sharp. Analyses of the wind fields in typical hurricanes indicate that cirrus generated at the eye wall and advected outward could produce in 12 to 18 hr. a canopy similar to those observed by meteorological satellites. If, in addition, generation occurs in the spiral arms, these times are shortened somewhat. Sharp edges would occur in regions where the radial outflow becomes small, probably less than 1 m. sec.−1, and where the tangential velocity is at a relative maximum.