TY - JOUR
T1 - KelvinWave and Its Impact on the Venus Atmosphere Tested by Observing System Simulation Experiment
AU - Sugimoto, Norihiko
AU - Fujisawa, Yukiko
AU - Shirasaka, Mimo
AU - Abe, Mirai
AU - Murakami, Shinya
AU - Kouyama, Toru
AU - Ando, Hiroki
AU - Takagi, Masahiro
AU - Yamamoto, Masaru
N1 - Funding Information:
Funding: This study was supported by the Global Science Campus of JST (Japan Science and Technology Agency). The work is partly supported by JSPS KAKENHI grants numbers JP19H0197, JP19H05605, JP19K14789, JP20H01958, and JP20K04064.
Publisher Copyright:
© 2022 by the authors.
PY - 2022/2
Y1 - 2022/2
N2 - At the cloud top of the Venus atmosphere, equatorial Kelvin waves have been observed and are considered to play an important role in the super-rotation. We were able to reproduce the wave in a general circulation model (GCM) by conducting an observing system simulation experiment (OSSE) with the help of a data assimilation system. The synthetic horizontal winds of the Kelvin wave produced by the linear wave propagating model are assimilated at the cloud top (~70 km) in realistic conditions, assuming they are obtained from cloud tracking of ultra-violet images (UVI) taken by the Venus orbiters. It is demonstrated using Eliassen–Palm (EP) fluxes that the reproduced Kelvin wave transports angular momentum and plays an important role in the magnitude and structure of the super-rotation, causing the acceleration and deceleration of zonal wind of ~0.1 m/s day−1. The conditions required in order to reproduce the Kelvin wave have also been investigated. It is desirable to have 24 hourly dayside satellite observations in an equatorial orbit, such as the Akatsuki Venus climate orbiter. The results of this type of data assimilation study will be useful in the planning of future observation missions to the atmospheres of planets.
AB - At the cloud top of the Venus atmosphere, equatorial Kelvin waves have been observed and are considered to play an important role in the super-rotation. We were able to reproduce the wave in a general circulation model (GCM) by conducting an observing system simulation experiment (OSSE) with the help of a data assimilation system. The synthetic horizontal winds of the Kelvin wave produced by the linear wave propagating model are assimilated at the cloud top (~70 km) in realistic conditions, assuming they are obtained from cloud tracking of ultra-violet images (UVI) taken by the Venus orbiters. It is demonstrated using Eliassen–Palm (EP) fluxes that the reproduced Kelvin wave transports angular momentum and plays an important role in the magnitude and structure of the super-rotation, causing the acceleration and deceleration of zonal wind of ~0.1 m/s day−1. The conditions required in order to reproduce the Kelvin wave have also been investigated. It is desirable to have 24 hourly dayside satellite observations in an equatorial orbit, such as the Akatsuki Venus climate orbiter. The results of this type of data assimilation study will be useful in the planning of future observation missions to the atmospheres of planets.
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U2 - 10.3390/atmos13020182
DO - 10.3390/atmos13020182
M3 - Article
AN - SCOPUS:85124940333
VL - 13
JO - ATMOSPHERE
JF - ATMOSPHERE
SN - 2073-4433
IS - 2
M1 - 182
ER -
