Observations of the breakdown of an atmospheric gravity wave near the cold summer mesopause at 54N
Observations of the breakdown of an atmospheric gravity wave near the cold summer mesopause at 54N
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54N 寒冷夏季中层顶附近大气重力波分解的观测
DOI：
10.1029/1999gl010792
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发表时间：
2000
影响因子：
5.2
通讯作者：
J. Höffner
中科院分区：
文献类型：
--
作者：
J. Hecht;C. Fricke;R. Walterscheid;J. Höffner
最近，伊利诺伊州厄巴纳(北纬40度)的一组气辉/激光雷达观测表明，在俄亥俄州气辉图像中看到的一些小尺度波状结构可以通过对流不稳定与大气重力波的破裂联系在一起。在德国库伦斯伯恩(北纬54度)同时进行的第二组气辉/激光雷达观测中，也观测到了夜光云(NLCS)。这表明，海浪破裂过程可以在支持NLCS发生的同样寒冷、低海拔的夏季中层顶条件下发生。这组新的数据表明，第一次观测并不是一个独特的事件，并支持了在NLC显示中看到的一些小尺度结构可能是由于波破裂的说法。
Recently, it was shown from a single set of airglow/lidar observations in Urbana, Illinois (40N) that some small‐scale wave‐like structure seen in OH airglow images can be associated with the breakdown, via a convective instability, of an atmospheric gravity wave. A second set of simultaneous airglow/lidar observations, showing wave breakdown, has been obtained over Kühlungsborn, Germany (54N) during a period when noctilucent clouds (NLCs) were also observed. This showed that the wave breakdown process can occur under the same cold, low altitude summer mesopause conditions that support the occurrence of NLCs. This new set of data shows that the first observations were not a unique event, and give credence to the suggestion that some of the small scale structure seen in NLC displays may be due to wave breakdown.