First Direct Observational Evidence for Secondary Gravity Waves Generated by Mountain Waves Over the Andes

Masaru Kogure, Jia Yue, Takuji Nakamura, Lars Hoffmann, Sharon L. Vadas, Yoshihiro Tomikawa, Mitsumu K. Ejiri, Diego Janches

研究成果: Contribution to journalArticle査読

3 被引用数 (Scopus)

抄録

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.

本文言語英語
論文番号e2020GL088845
ジャーナルGeophysical Research Letters
47
17
DOI
出版ステータス出版済み - 9 16 2020

All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 地球惑星科学(全般)

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