Observation system simulation experiment for new radio occultation observations 
using multiple small satellites on Venus

Fujisawa, Yukiko; Sugimoto, Norihiko; Ao, Chi; Hosono, Asako; Ando, Hiroki; Takagi, Masahiro; Garate-Lopez, Itziar; Lebonnois, Sebastien

doi:10.57757/IUGG23-0221

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Observation system simulation experiment for new radio occultation observations using multiple small satellites on Venus

Authors

Fujisawa, Yukiko
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Sugimoto, Norihiko
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ao, Chi
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Hosono, Asako
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Ando, Hiroki
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Takagi, Masahiro
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Garate-Lopez, Itziar
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

Lebonnois, Sebastien
IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations;

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Citation

Fujisawa, Y., Sugimoto, N., Ao, C., Hosono, A., Ando, H., Takagi, M., Garate-Lopez, I., Lebonnois, S. (2023): Observation system simulation experiment for new radio occultation observations using multiple small satellites on Venus, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-0221

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5016262

Abstract

The radio occultation (RO) observations using multiple small satellites are expected not to be interrupted by a thick global cloud layer at about 48–70 km altitudes, and to enable frequent observations of the global vertical temperature distribution at 40–90 km altitudes. In this study, we focus on a phenomenon peculiar to Venus called “cold collar”, in which the polar region becomes warmer than the surrounding latitudes of 60–80 ° at 65 km altitude, and the Observation System Simulation Experiment (OSSE) is carried out assuming RO observation by satellites to be launched in the future. For the Venus assimilation system, “ALEDAS-V” (AFES LETKF Data Assimilation System for Venus) based on LETKF (Local Ensemble Transform Kalman Filter) is used. For the ensemble forecast, the Venus general circulation model “AFES-Venus” is used. For the pseudo-observation data, we use the temperature output of the IPSL Venus GCM (now called the Venus “Planetary Climate Model; PCM”) which represent ideal cold collar by radiative forcing. The temperature at 40–90 km altitudes corresponding to observation points obtained by orbit calculations is used as pseudo-observation data. As a result, while the experiment without assimilation (free run) cannot reproduce the cold collar at 67 km altitude, the RO OSSE reproduces it.