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Author (up) Kogure, M.; Yue, J.; Nakamura, T.; Hoffmann, L.; Vadas, S.L.; Tomikawa, Y.; Ejiri, M.K.; Janches, D. url  doi
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  Title First Direct Observational Evidence for Secondary Gravity Waves Generated by Mountain Waves Over the Andes Type Journal Article
  Year 2020 Publication Geophysical Research Letters Abbreviated Journal Geophys. Res. Lett.  
  Volume 47 Issue 17 Pages  
  Keywords Remote Sensing; Atmospheric Science  
  Abstract 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.  
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  ISSN 0094-8276 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number GFZ @ kyba @ Serial 3117  
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