TY - JOUR
T1 - First Direct Observational Evidence for Secondary Gravity Waves Generated by Mountain Waves Over the Andes
AU - Kogure, Masaru
AU - Yue, Jia
AU - Nakamura, Takuji
AU - Hoffmann, Lars
AU - Vadas, Sharon L.
AU - Tomikawa, Yoshihiro
AU - Ejiri, Mitsumu K.
AU - Janches, Diego
N1 - Funding Information:
We thank Joan Alexander for her suggestion for the calculation of the temperature perturbations averaged with the AIRS's kernel in MERRA‐2. This study was supported by JSPS KAKENHI 19K23465 and the Scientific Committee on Antarctic Research (SCAR) fellowship award 2019. M. K. was supported by the JSPS grant JRPs‐LEAD with DFG program. S. L. V. was supported by NSF grant AGS‐1832988 and by NASA grant 80NSSC19K0836. J. Y. was supported by NSF grants AGS‐1651394 and AGS‐1834222 and by NASA grants 80NSSC19K0836 and 80NSSC20K0628.
Publisher Copyright:
©2020. American Geophysical Union. All Rights Reserved.
PY - 2020/9/16
Y1 - 2020/9/16
N2 - 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.
AB - 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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U2 - 10.1029/2020GL088845
DO - 10.1029/2020GL088845
M3 - Article
AN - SCOPUS:85090876720
SN - 0094-8276
VL - 47
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 17
M1 - e2020GL088845
ER -