Observing-System Research and Ensemble Data Assimilation at JAMSTEC

  • Takeshi EnomotoEmail author
  • Takemasa Miyoshi
  • Qoosaku Moteki
  • Jun Inoue
  • Miki Hattori
  • Akira Kuwano-Yoshida
  • Nobumasa Komori
  • Shozo Yamane


Recent activities on ensemble data assimilation and its application to observing-system research at the Japan Agency for Marine-Earth Science and Technology are reviewed. A revised version of an ensemble-based data assimilation system for global atmospheric data has been developed on the second-generation Earth Simulator. This system assimilates conventional atmospheric observations and satellite-based wind data into an atmospheric general circulation model using the local ensemble transform Kalman filter (LETKF), a deterministic ensemble Kalman filter algorithm that is extremely efficient with parallel computer architecture. The updated system incorporates improvements to the previous system in the forecast model, data assimilation algorithm and input data. Using the LETKF system, observations taken during field campaigns are evaluated by data assimilation experiments involving adding or removing observations. The results of these observing-system experiments successfully demonstrate the value of the observations and are highly useful for exploring the predictability of atmospheric disturbances.


Field Campaign Global Precipitation Climatology Project Ensemble Spread Earth Simulator Atmospheric Model Intercomparison Project 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Takeshi Enomoto
    • 1
    • 2
    Email author
  • Takemasa Miyoshi
    • 3
    • 4
  • Qoosaku Moteki
    • 5
  • Jun Inoue
    • 5
  • Miki Hattori
    • 5
  • Akira Kuwano-Yoshida
    • 2
  • Nobumasa Komori
    • 2
  • Shozo Yamane
    • 6
  1. 1.Disaster Prevention Research InstituteKyoto UniversityUjiJapan
  2. 2.Earth Simulator CenterJapan Agency for Marine-Earth Science and TechnologyKanazawa-ku, YokohamaJapan
  3. 3.RIKEN Advanced Institute for Computational ScienceKobeJapan
  4. 4.Department of Atmospheric and Oceanic ScienceUniversity of MarylandCollege ParkUSA
  5. 5.Research Institute for Global ChangeJapan Agency for Marine-Earth Science and TechnologyYokosukaJapan
  6. 6.Department of Environmental Systems ScienceDoshisha UniversityKyotanabeJapan

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