Simultaneous observations of convective gravity waves from a ground‐based airglow imager and the AIRS satellite experiment
Simultaneous observations of convective gravity waves from a ground‐based airglow imager and the AIRS satellite experiment
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DOI：
10.1002/jgrd.50341
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发表时间：
2013-04
期刊：
影响因子：
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通讯作者：
J. Yue;L. Hoffmann;M. Joan Alexander
中科院分区：
文献类型：
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作者：
J. Yue;L. Hoffmann;M. Joan Alexander
我们报告的对流产生的重力波（GW）的第一次联合观测使用OH气辉成像仪在科罗拉多和大气红外探测器（AIRS）的Aqua卫星上。在2008年6月3日晚上的气辉图像中，在北美大平原西部地区观测到了对流性全球变暖，表现为同心环。在8.1微米的大气辐射强度下，观测天气雷达和AIRS的辐射强度，在同心环的中心附近发现了强对流云。AIRS在4.3 µm的数据显示，在0900 UT时水平波长为60-80 km的半圆形GW，而气辉成像仪在0910 UT时在相同的地理位置观察到水平波长约为44 km的圆形GW和约6%的气辉发射扰动。在不同时间的AIRS数据和气辉图像中都可以看到向西北方向发射的大规模GW（水平波长大于100 km）。成像仪在傍晚时分观察到与中层顶不稳定的同心GW相关的小尺度涟漪。在AIRS数据中，大气中的大气辉光亮温扰动约为0.16K，假设大气辉光从平流层向上中层传播时没有耗散，大气辉光对大气的扰动约为4%~ 17%。射线跟踪模拟表明，在AIRS和成像仪中看到的GW可能是由相同的对流系统激发的。
We report the first joint observations of convectively generated gravity waves (GWs) using an OH airglow imager in Colorado and the Atmospheric Infrared Sounder (AIRS) onboard the Aqua satellite. Convective GWs, appearing as concentric rings, are observed over the western Great Plain regions of North America in the evening of 3 June 2008 in the airglow images. Inspecting both weather radars and AIRS radiances at 8.1 µm, strong convective clouds are found near the center of the concentric rings. The AIRS data at 4.3 µm show semicircular GWs with horizontal wavelengths of 60–80 km at 0900 UT, whereas the airglow imager observed circular GWs with horizontal wavelengths of ~44 km and airglow emission perturbation of ~6% at the same geographic location at 0910 UT. Large‐scale GWs (horizontal wavelengths greater than 100 km) emanating northwestward can be seen in both AIRS data and airglow images at different times. The imager observed small‐scale ripples associated with unstable concentric GWs in the mesopause in the early evening. Given that the brightness temperature perturbation of the GWs in the AIRS data is about 0.16 K and assuming that the GWs propagate without dissipation from the stratosphere to the upper mesosphere, the expected airglow emission perturbation caused by the GWs would be 4%–17%. Ray tracing simulations are performed to demonstrate that the GWs seen in AIRS and in the imager were likely excited by the same convective system.