Evidence of the formation of noctilucent clouds due to propagation of an isolated gravity wave caused by a tropospheric occluded front
Evidence of the formation of noctilucent clouds due to propagation of an isolated gravity wave caused by a tropospheric occluded front
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由于对流层遮挡锋引起的孤立重力波的传播而形成夜光云的证据
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
I. Grigoryeva
中科院分区：
文献类型：
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作者：
P. Dalin;A. Pogoreltsev;N. Pertsev;V. Perminov;N. Shevchuk;A. Dubietis;M. Zalcik;S. Kulikov;A. Zadorozhny;D. Kudabayeva;A. Solodovnik;G. Salakhutdinov;I. Grigoryeva
我们考虑了一个独特的情况下，传播的内部重力波，原位产生了一个紧凑的和薄的层，在82.7-85.2公里，65-70公里的水平尺度的特征，在莫斯科地区观测到的2013年7月18日至19日的夜晚。这种特殊的瞬态孤立重力波连同整个NLC层突然出现在晴朗的黄昏天空中，并持续约1小时向东传播，这与先前观察到的重力波通过预先存在的NLC层传播的情况有很大不同。我们的模型研究表明，波有一个对流层源连接到一个闭塞的前面的通道。这波可能是由于大约5公里高度的强烈水平风切变而产生的。
We consider a unique case of a propagating internal gravity wave that has generated in situ a compact and thin layer of noctilucent clouds (NLC) at 82.7–85.2 km with a characteristic horizontal scale of 65–70 km, as observed in the Moscow region on the night of 18–19 July 2013. This particular transient isolated gravity wave together with the whole NLC layer suddenly appeared in the clear twilight sky and lasted about 1 h traveling eastward, which differs significantly from previously observed cases of gravity waves propagating through preexisting NLC layers. Our model studies demonstrate that the wave had a tropospheric source connected to the passage of an occluded front. The wave was likely generated due to strong horizontal wind shears at about 5 km altitude.