Special edition on the JRA-25 reanalysis

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  • ONOGI Kazutoshi
    Japan Meteorological Agency, Tokyo
  • TSUTSUI Junichi
    Central Research Institute of Electric Power Industry, Abiko
  • KOIDE Hiroshi
    Japan Meteorological Agency, Tokyo
  • SAKAMOTO Masami
    Japan Meteorological Agency, Tokyo
  • KOBAYASHI Shinya
    Japan Meteorological Agency, Tokyo
  • HATSUSHIKA Hiroaki
    Central Research Institute of Electric Power Industry, Abiko Toyama Prefectural Environmental Science Research Center, Imizu
  • MATSUMOTO Takanori
    Japan Meteorological Agency, Tokyo Meteorological Satellite Center, Japan Meteorological Agency, Kiyose
  • YAMAZAKI Nobuo
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba Meteorological College, Japan Meteorological Agency, Kashiwa
  • KAMAHORI Hirotaka
    Japan Meteorological Agency, Tokyo Meteorological Research Institute, Japan Meteorological Agency, Tsukuba
  • TAKAHASHI Kiyotoshi
    Meteorological Research Institute, Japan Meteorological Agency, Tsukuba
  • KADOKURA Shinji
    Central Research Institute of Electric Power Industry, Abiko
  • WADA Koji
    Central Research Institute of Electric Power Industry, Abiko
  • KATO Koji
    Meteorological Satellite Center, Japan Meteorological Agency, Kiyose
  • OYAMA Ryo
    Meteorological Satellite Center, Japan Meteorological Agency, Kiyose
  • OSE Tomoaki
    Japan Meteorological Agency, Tokyo Meteorological Research Institute, Japan Meteorological Agency, Tsukuba
  • MANNOJI Nobutaka
    Japan Meteorological Agency, Tokyo
  • TAIRA Ryusuke
    Meteorological College, Japan Meteorological Agency, Kashiwa

書誌事項

タイトル別名
  • The JRA-25 Reanalysis
  • The JRA-25
公開日
2007
DOI
  • 10.2151/jmsj.85.369
公開者
公益社団法人 日本気象学会

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説明

A long-term global atmospheric reanalysis, named “Japanese 25-year Reanalysis (JRA-25)” was completed using the Japan Meteorological Agency (JMA) numerical assimilation and forecast system. The analysis covers the period from 1979 to 2004. This is the first long-term reanalysis undertaken in Asia. JMA's latest numerical assimilation system, and specially collected observational data, were used to generate a consistent and high-quality reanalysis dataset designed for climate research and operational monitoring and forecasts. One of the many purposes of JRA-25 is to enhance the analysis to a high quality in the Asian region.<br>Six-hourly data assimilation cycles were performed, producing 6-hourly atmospheric analysis and forecast fields of various physical variables. The global model used in JRA-25 has a spectral resolution of T106 (equivalent to a horizontal grid size of around 120 km) and 40 vertical layers with the top level at 0.4 hPa. In addition to conventional surface and upper air observations, atmospheric motion vector (AMV) wind retrieved from geostationary satellites, brightness temperature from TIROS Operational Vertical Sounder (TOVS), precipitable water retrieved from orbital satellite microwave radiometer radiance and other satellite data are assimilated with three-dimensional variational method (3D-Var). JMA produced daily sea surface temperature (SST), sea ice and three-dimensional ozone profiles for JRA-25. A new quality control method for TOVS data was developed and applied in advance.<br>Many advantages have been found in the JRA-25 reanalysis. Predicted 6-hour global total precipitation distribution and amount are well reproduced both in space and time. The performance of the long time series of the global precipitation is the best among the other reanalyses, with few unrealistic variations from degraded satellite data contaminated by volcanic eruptions. Secondly, JRA-25 is the first reanalysis to assimilate wind profiles around tropical cyclones reconstructed from historical best track information; tropical cyclones were analyzed properly in all the global regions. Additionally, low-level cloud along the subtropical western coast of continents is well simulated and snow depth analysis is also of a good quality. The article also covers material which requires attention when using JRA-25.

収録刊行物

  • 気象集誌. 第2輯

    気象集誌. 第2輯 85 (3), 369-432, 2007

    公益社団法人 日本気象学会

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