Global Historical Reanalysis with a 60-km AGCM and Surface Pressure Observations: OCADA

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  • ISHII Masayoshi
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • KAMAHORI Hirotaka
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • KUBOTA Hisayuki
    Department of Earth and Planetary Sciences, Faculty of Science, Hokkaido University, Sapporo, Japan
  • ZAIKI Masumi
    Seikei University, Tokyo, Japan
  • MIZUTA Ryo
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • KAWASE Hiroaki
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • NOSAKA Masaya
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • YOSHIMURA Hiromasa
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • OSHIMA Naga
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • SHINDO Eiki
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • KOYAMA Hiroshi
    Japan Agency for Marin-Earth Science and Technology, Yokohama, Japan
  • MORI Masato
    Research Institute for Applied Mechanics, Kyushu University, Kasuga, Japan
  • HIRAHARA Shoji
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • IMADA Yukiko
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan University of Tokyo, Kashiwa, Japan
  • YOSHIDA Kohei
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • NOZAWA Toru
    Okayama University, Okayama, Japan
  • TAKEMI Tetsuya
    Disaster Prevention Research Institute, Kyoto University, Uji, Japan
  • MAKI Takashi
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba, Japan
  • NISHIMURA Akio
    Climate Prediction Division, Japan Meteorological Agency, Tokyo, Japan

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<p>A historical atmospheric reanalysis from 1850 to 2015 was performed using an atmospheric general circulation model assimilating surface pressure observations archived in international databases, with perturbed observational sea surface temperatures as a lower boundary condition. Posterior spread during data assimilation provides quantitative information on the uncertainty in the historical reanalysis. The reanalysis reproduces the evolution of the three-dimensional atmosphere close to those of the operational centers. Newly archived surface pressure observations greatly reduced the uncertainties in the present reanalysis over East Asia in the early 20th century. A scheme for assimilating tropical cyclone tracks and intensities was developed. The scheme was superior to the present several reanalyses in reproducing the intensity close to the observations and the positions. The reanalysis provides possible images of atmospheric circulations before reanalyses with full-scale observations become available, and opportunities for investigating extreme events that occurred before World War II. Incorporating dynamical downscaling with a regional model that includes detailed topography and sophisticated physics is an application of historical reanalysis to reveal the details of past extreme events. Some examples of past heavy rainfall events in Japan are shown using a downscaling experiment, together with dense rainfall observations over the Japanese islands.</p>

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