MST radar observations of short‐period gravity wave during overhead tropical cyclone
MST radar observations of short‐period gravity wave during overhead tropical cyclone
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DOI：
10.1029/2011rs004840
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发表时间：
2012-04
期刊：
影响因子：
1.6
通讯作者：
S. Das;K. N. Uma;S. Das
中科院分区：
文献类型：
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作者：
S. Das;K. N. Uma;S. Das
利用位于加丹基(13.5°N，79.2°E)的中层-平流层-对流层(MST)雷达，讨论了与热带气旋过境有关的短周期重力波。观测到的平流层重力波周期为∼42min，垂直和水平波长分别为∼3.5 km和14 km。重力波的最大振幅出现在对流层上部和平流层下部(UTLS)，并出现周期性的上升气流和下降气流。这削弱了对流层顶的稳定性，这是在雷达信噪比(SNR)中观察到的。在平流层低层观测到的∼−0.6m2/s2量级垂直动量通量的增强归因于气旋产生的重力波。发现障碍效应是与热带气旋相关的观测重力波的产生机制。
Short‐period gravity waves associated with the passage of tropical cyclone using mesosphere‐stratosphere‐troposphere (MST) radar located at Gadanki (13.5°N, 79.2°E) has been discussed. The observed stratospheric gravity wave is found to have a periodicity of ∼42 min, vertical and horizontal wavelength of ∼3.5 km and 14 km, respectively. Maximum amplitude of gravity wave is observed in the upper troposphere and lower stratosphere (UTLS) region due to which periodic updrafts and downdrafts are observed. This weakens the stability of tropopause, which is observed in radar signal‐to‐noise ratio (SNR). The enhancement of vertical momentum flux of order ∼−0.6 m2/s2 observed in the lower stratosphere is attributed to the cyclone generated gravity waves. The obstacle effect is found to be the generative mechanism for the observed gravity waves associated with the tropical cyclone.