First Direct Observational Evidence for Secondary Gravity Waves Generated by Mountain Waves Over the Andes
First Direct Observational Evidence for Secondary Gravity Waves Generated by Mountain Waves Over the Andes
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DOI：
10.1029/2020gl088845
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发表时间：
2020-06
影响因子：
5.2
通讯作者：
Masaru Kogure;J. Yue;Takuji Nakamura;L. Hoffmann;S. Vadas;Y. Tomikawa;M. Ejiri;D. Janches
中科院分区：
文献类型：
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作者：
Masaru Kogure;J. Yue;Takuji Nakamura;L. Hoffmann;S. Vadas;Y. Tomikawa;M. Ejiri;D. Janches
2017年7月24日至25日，在大气红外探测器（AIRS）/Aqua卫星数据中，在安第斯山脉上空观测到了一个具有显著亮温幅度和约500 km水平波长的山波。在现代研究和应用回顾分析第2版（MERRA-2）中，再分析数据显示，强烈的东风流过安第斯山脉。可见光/红外成像辐射计套件（VIIRS）/Suomi-NPP（国家极轨伙伴关系）没有探测到山波;但是，它在同一天晚上在南安第斯山脉的背风处观测到了波长约为100 km的夜光发射中的同心环状波。射线追踪分析表明，山波传播到了安第斯山脉的东部，在山波破碎的区域上方出现了同心环形波。因此，同心环状波可能是伴随着山波破碎的动量沉积所产生的次级波。这些结果为动量沉积产生二次重力波提供了第一个直接证据。
A mountain wave with a significant brightness temperature amplitude and ~500 km horizontal wavelength was observed over the Andes on 24–25 July 2017 in Atmospheric Infrared Sounder (AIRS)/Aqua satellite data. In the Modern‐Era Retrospective Analysis for Research and Applications, version 2 (MERRA‐2), reanalysis data, the intense eastward wind flowed over the Andes. Visible/Infrared Imaging Radiometer Suite (VIIRS)/Suomi‐NPP (National Polar‐orbiting Partnership) did not detect the mountain waves; however, it observed concentric ring‐like waves in the nightglow emissions at ~87 km with ~100 km wavelengths on the same night over and leeward of the Southern Andes. A ray tracing analysis showed that the mountain waves propagated to the east of the Andes, where concentric ring‐like waves appeared above a region of mountain wave breaking. Therefore, the concentric ring‐like waves were likely secondary waves generated by momentum deposition that accompanied mountain wave breaking. These results provide the first direct evidence for secondary gravity waves generated by momentum deposition.