Structure of the atmosphere in the vicinity of large‐amplitude Kelvin‐Helmholtz billows
Structure of the atmosphere in the vicinity of large‐amplitude Kelvin‐Helmholtz billows
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大振幅开尔文-亥姆霍兹波涛附近的大气结构
DOI：
10.1002/qj.49709741304
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发表时间：
1971
影响因子：
8.9
通讯作者：
K. Browning
中科院分区：
文献类型：
--
作者：
K. Browning
用高功率雷达探测到对流层上层17次波峰-波谷幅度超过200m的Kelvin-Helmholtz波浪场。由精密雷达跟踪的每小时无线电探空序列得到了与之相关的静力稳定性、垂直风切变和Richardson数的中尺度模式。研究发现，每一次巨浪的发生都与明确的局地风切变极大值密切相关。在某些情况下，剪切强度高达9m，S−1每200m。在200m深的地层上估算Richardson数的最小值通常在0.15-0.3之间。
Data are presented for 17 separate occurrences of Kelvin-Helmholtz billows in the upper troposphere for which the crest-to-trough amplitude exceeded 200 m. The billows were detected in clear air by means of high-power radar. The associated mesoscale patterns of static stability, vertical wind shear, and Richardson number have been derived from sequences of hourly radiosondes tracked by precision radar. Every occurrence of billows was found to be closely associated with well-defined, local, wind-shear maxima. In some cases the shear was as strong as 9 m s−1 per 200 m. The minimum value of the Richardson number when evaluated over layers 200 m deep was usually found to be in the range 0.15–0.3.