著者
Shinya KOBAYASHI Yukinari OTA Yayoi HARADA Ayataka EBITA Masami MORIYA Hirokatsu ONODA Kazutoshi ONOGI Hirotaka KAMAHORI Chiaki KOBAYASHI Hirokazu ENDO Kengo MIYAOKA Kiyotoshi TAKAHASHI
出版者
(公社)日本気象学会
雑誌
気象集誌. 第2輯 (ISSN:00261165)
巻号頁・発行日
vol.93, no.1, pp.5-48, 2015 (Released:2015-03-18)
参考文献数
128
被引用文献数
213 1132

The Japan Meteorological Agency (JMA) conducted the second Japanese global atmospheric reanalysis, called the Japanese 55-year Reanalysis or JRA-55. It covers the period from 1958, when regular radiosonde observations began on a global basis. JRA-55 is the first comprehensive reanalysis that has covered the last half-century since the European Centre for Medium-Range Weather Forecasts 45-year Reanalysis (ERA-40), and is the first one to apply four-dimensional variational analysis to this period. The main objectives of JRA-55 were to address issues found in previous reanalyses and to produce a comprehensive atmospheric dataset suitable for studying multidecadal variability and climate change. This paper describes the observations, data assimilation system, and forecast model used to produce JRA-55 as well as the basic characteristics of the JRA-55 product. JRA-55 has been produced with the TL319 version of JMA’s operational data assimilation system as of December 2009, which was extensively improved since the Japanese 25-year Reanalysis (JRA-25). It also uses several newly available and improved past observations. The resulting reanalysis products are considerably better than the JRA-25 product. Two major problems of JRA-25 were a cold bias in the lower stratosphere, which has been diminished, and a dry bias in the Amazon basin, which has been mitigated. The temporal consistency of temperature analysis has also been considerably improved compared to previous reanalysis products. Our initial quality evaluation revealed problems such as a warm bias in the upper troposphere, large upward imbalance in the global mean net energy fluxes at the top of the atmosphere and at the surface, excessive precipitation over the tropics, and unrealistic trends in analyzed tropical cyclone strength. This paper also assesses the impacts of model biases and changes in the observing system, and mentions efforts to further investigate the representation of low-frequency variability and trends in JRA-55.

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@TSUJINO_SATOKI う,耳学問で,JRA-55にしか入っていないと思っている人です... よく読むと,https://t.co/fXn976bqJE "Wind profile retrievals surround… https://t.co/UTrE2ywHEH
The paper describing how the JRA-55 Reanalysis was put together: https://t.co/VdsmPlZvk1 Link found at the ever-us… https://t.co/ClVGW6sstV
Journal of the Meteorological Society of Japan paper documents robustness of MSU lower trop T analyses https://t.co/MM2wQVu9on
re:robustness of satellite analyses of long term tropospheric T trends; see https://t.co/MM2wQVu9on h/t Erik https://t.co/BvVAZjUl4v
3ヶ月連続首位 Kobayashi et al 2015: The JRA-55 Reanalysis... J. Meteor. Soc. Japan http://t.co/YP9HEWJvBo  https://t.co/a19PTDvL1H
6月のJMSJ最多アクセスは Kobayashi et al. (2015) の JRA-55 論文です。 http://t.co/YP9HEWJvBo https://t.co/HmtN1pXReF
JRA55の参考文献が出版され,ページ数まで定まりましたね. Kobayashi et al. (2015) JMSJ, Vol. 93, p. 5-48 http://t.co/bSrrnxdmfs
JMSJ Vol 93, 2月号の電子版が公開されました。 https://t.co/Yd5pT9eOFv Editorial http://t.co/5FMmIpYmNk JRA55論文 Kobayashi et al (2015) http://t.co/NDoy4NmS7B

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