Curriculum Vitaes

Shin-ya MURAKAMI

  (村上 真也)

Profile Information

Affiliation
Associate Senior Researcher, Institute of Space and Astronautical Science, Lunar and Planetary Exploration Data Analysis Group, Japan Aerospace Exploration Agency
Degree
Doctor of Science(Mar, 2011, Kobe University)

Researcher number
40769783
ORCID ID
 https://orcid.org/0000-0002-7137-4849
J-GLOBAL ID
201501011383506237
researchmap Member ID
B000249646

I'm working on archiving data sets acquired by space and planetary exploration missions.


Papers

 39
  • Yukiko Fujisawa, Shin-ya Murakami, Norihiko Sugimoto, Nobumasa Komori, Masahiro Takagi, Takeshi Imamura, Takeshi Horinouchi, George L. Hashimoto, Masaki Ishiwatari, Takeshi Enomoto, Takemasa Miyoshi, Hiroki Kashimura, Toshiki Matsushima, Yoshi-Yuki Hayashi
    Geoscience Data Journal, 13(3) e70080, May 12, 2026  Peer-reviewed
    ABSTRACT An objective analysis dataset of the Venus atmosphere, ALERA‐V version 1.0, has been released. This objective analysis provides the best estimate of the state of the Venus atmosphere produced by combining observations and a forecast model weighted according to their respective levels of uncertainty. The accumulation of frequent observations by the Venus Climate Orbiter ‘Akatsuki’ has, for the first time, enabled an objective analysis of the Venus atmosphere. ALERA‐V stands for AFES‐LETKF experimental ensemble objective (re)analysis of the Venus atmosphere, and is generated by ALEDAS‐V, the AFES‐LETKF data assimilation system for the Venus atmosphere. ALEDAS‐V uses AFES‐Venus (Atmospheric General Circulation Model for the Earth Simulator for Venus) as a forecast model and the LETKF (Local Ensemble Transform Kalman Filter) for data assimilation. The observations of the zonal and meridional winds obtained by a cloud tracking technique from images taken by Akatsuki's UVI (Ultraviolet Imager) are assimilated to produce ALERA‐V version 1.0. The dataset consists of atmospheric variables defined on a grid of 128 longitude and 64 latitude points, and 60 vertical levels, with output every 6 Earth hours from September to December 2018, including the intensive observation period of November. ALERA‐V is expected to be useful for both scientific and engineering research, such as understanding the dynamical mechanisms of various atmospheric phenomena and planning for future satellite missions, with appropriate consideration of its quality and limitations.
  • Takeshi Horinouchi, Toru Kouyama, Masataka Imai, Shin‐ya Murakami, Yeon Joo Lee, Atsushi Yamazaki, Manabu Yamada, Shigeto Watanabe, Takeshi Imamura, Javier Peralta, Takehiko Satoh
    Journal of Geophysical Research: Planets, Mar, 2024  
  • Makoto Taguchi, Toru Kouyama, Temma Sugawa, Shin-ya Murakami, Masahiko Futaguchi
    Earth, Planets and Space, Apr 10, 2023  
  • Yukiko Fujisawa, Shin-ya Murakami, Norihiko Sugimoto, Masahiro Takagi, Takeshi Imamura, Takeshi Horinouchi, George L. Hashimoto, Masaki Ishiwatari, Takeshi Enomoto, Takemasa Miyoshi, Hiroki Kashimura, Yoshi-Yuki Hayashi
    Scientific Reports, 12(1), Aug 26, 2022  Peer-reviewed
    Abstract The planetary missions including the Venus Climate Orbiter ‘Akatsuki’ provide new information on various atmospheric phenomena. Nevertheless, it is difficult to elucidate their three-dimensional structures globally and continuously only from observations because satellite observations are considerably limited in time and space. We constructed the first ‘objective analysis’ of Venus’ atmosphere by assimilating cloud-top horizontal winds on the dayside from the equator to mid-latitudes, which is frequently obtained from Akatsuki's Ultraviolet Imager (UVI). The three-dimensional structures of thermal tides, found recently to play a crucial role in maintaining the super rotation, are greatly improved by the data assimilation. This result is confirmed by comparison with Akatsuki's temperature observations. The momentum transport caused by the thermal tides and other disturbances are also modified by the wind assimilation and agrees well with those estimated from the UVI observations. The assimilated dataset is reliable and will be open to the public along with the Akatsuki observations for further investigation of Venus’ atmospheric phenomena.
  • Norihiko Sugimoto, Yukiko Fujisawa, Mimo Shirasaka, Mirai Abe, Shin-ya Murakami, Toru Kouyama, Hiroki Ando, Masahiro Takagi, Masaru Yamamoto
    Atmosphere, 13(2) 182-182, Jan 24, 2022  
    <jats:p>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.</jats:p>

Misc.

 18

Presentations

 93

Research Projects

 3