Equatorial Atmosphere Radar observations of short vertical wavelength gravity waves in the upper troposphere and lower stratosphere region induced by localized convection
Equatorial Atmosphere Radar observations of short vertical wavelength gravity waves in the upper troposphere and lower stratosphere region induced by localized convection
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DOI：
10.1029/2006gl027026
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发表时间：
2006-10
影响因子：
5.2
通讯作者：
S. Dhaka;M. Yamamoto;Y. Shibagaki;H. Hashiguchi;S. Fukao;H. Chun
中科院分区：
文献类型：
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作者：
S. Dhaka;M. Yamamoto;Y. Shibagaki;H. Hashiguchi;S. Fukao;H. Chun
赤道大气雷达(EAR)观测结果表明，在对流层上部和平流层下部(∼2~4 km)有明显的垂直短波重力波。结果是根据2004年4月11日和4月26日观测到的两次对流事件得出的。在对流区(∼12-13公里高度)上方，垂直风廓线的垂直波长(λz)明显减小。具有短λz的重力波有很大一部分在平流层下部耗散，因此它们的作用被认为对UTLS区的动力学有重要意义。在12公里到20公里高度之间，重力波的λz逐渐减小，部分原因是Brunt Väisälla频率从∼12公里到20公里高度的稳定增加。UTLS波幅的降低可能是由于减震机制所致。
Equatorial Atmosphere Radar (EAR) observations made at Koto Tabang (0.2°S, 100.32°E) revealed that gravity waves with a short vertical wavelength (∼2–4 km) were evident in the upper troposphere and lower stratosphere (UTLS). Results are based on two convective events observed on 11 April and 26 April 2004. Above the convective region (∼12–13 km heights) the decrease in the vertical wavelength (λz) found in vertical wind profiles was noticeable. Large portions of the induced gravity waves with short λz dissipated in the lower stratosphere and hence their role is considered to be of importance for the dynamics of UTLS region. Gradual decrease in λz of gravity waves between 12 km and 20 km heights is partly made by a steady increase in Brunt Väisälla frequency from ∼12 km to 20 km heights. The decrease in amplitude in UTLS may be due to damping mechanism.