Mesospheric gravity waves over a tropical convective region observed by OH airglow imaging in Indonesia
Mesospheric gravity waves over a tropical convective region observed by OH airglow imaging in Indonesia
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DOI：
10.1029/2003gl017619
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发表时间：
2003-09
影响因子：
5.2
通讯作者：
Takuji Nakamura;T. Aono;T. Tsuda;A. Admiranto;E. Achmad;Suranto
中科院分区：
文献类型：
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作者：
Takuji Nakamura;T. Aono;T. Tsuda;A. Admiranto;E. Achmad;Suranto
通过在印度尼西亚进行的一年多的OH气辉成像观测，提取了MLT（中层和低热层）区域的74个重力波事件。观测到的重力波周期、水平波长和观测到的水平相速度通常分别为 5-13 分钟、13-45 km 和 37-75 m/s。除12月至2月期间优先向东传播外，传播方向大多向南。 GMS（地球静止气象卫星）估计的对流层云的空间分布与重力波的传播方向一致，即这些云主要存在于与重力波传播方向相反的方向。这表明，低纬MLT地区短周期重力波的水平传播特性主要受对流层波源分布的影响，而中层大气背景平均风的影响较小，赤道地区较弱(~20 m/s)。
From OH airglow imaging observation carried out over one year in Indonesia, 74 events of gravity waves in the MLT (Mesosphere and Lower Thermosphere) region were extracted. Observed period, horizontal wavelength and observed horizontal phase speeds of gravity waves were typically 5–13 min, 13–45 km and 37–75 m/s, respectively. Propagation directions were mostly southward except for the period between December and February, when eastward propagation was preferential. Spatial distributions of tropospheric clouds, estimated with GMS (Geostationary Meteorological Satellite) were consistent with the propagation direction of gravity waves, i.e., these clouds mainly existed in the opposite direction to the propagation direction of waves. This suggests that horizontal propagation characteristics of the short period gravity waves in the low latitude MLT region are mainly affected by the distribution of the wave sources in the troposphere, and the effect of the background mean wind in the middle atmosphere is smaller, as it is weaker (∼20 m/s) in the equatorial region.