Breaking of small‐scale gravity wave and transition to turbulence observed in OH airglow
Breaking of small‐scale gravity wave and transition to turbulence observed in OH airglow
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OH 气辉中观察到的小尺度重力波的破裂和向湍流的转变
DOI：
10.1029/2000gl011945
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发表时间：
2001
影响因子：
5.2
通讯作者：
T. Tsuda
中科院分区：
文献类型：
--
作者：
Y. Yamada;H. Fukunishi;Takuji Nakamura;T. Tsuda
本文报道了1995年12月23日在日本用OH气辉CCD相机和流星雷达观测到的中层顶附近小尺度重力波破裂成湍流的情况。小尺度重力波在背景风的作用下传播，水平波长为1027 km，视水平相速度为107ms −1，固有周期为105.6分钟。波浪破碎事件开始于较小尺度结构的出现，这些结构平行于破碎波的相锋排列，并发展成更随机的湍流状特征。不稳定结构在OH图像中存在约40分钟。
We report on observations of small‐scale gravity wave breaking into turbulence around the mesopause height using an OH airglow CCD camera and a meteor radar performed on December 23, 1995 in Japan. The small‐scale gravity wave propagated against the background wind with a horizontal wavelength of ∼27 km, an apparent horizontal phase velocity of ∼7 ms−1, and an intrinsic period of ∼5.6 minutes. Wave breaking event began with an appearance of smaller‐scale structures, which were aligned parallel to the phase fronts of the breaking wave and advanced into more random, turbulence‐like features. The instability structures were present in the OH images for about 40 minutes.