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The Japanese 55-year Reanalysis "JRA-55": An Interim Report

2011; The Meteorological Society of Japan; Volume: 7; Linguagem: Inglês

10.2151/sola.2011-038

1349-6476

Ayataka Ebita, Shinya Kobayashi, Yukinari Ota, Masami Moriya, Ryoji Kumabe, Kazutoshi Onogi, Yayoi Harada, Soichiro Yasui, Kengo Miyaoka, Kiyotoshi Takahashi, Hirotaka Kamahori, Chiaki Kobayashi, Hirokazu Endo, Motomu Soma, Yoshinori Oikawa, Takahisa Ishimizu,

Atmospheric and Environmental Gas Dynamics

The Japan Meteorological Agency (JMA) started the second Japanese global atmospheric reanalysis project named the Japanese 55-year Reanalysis (JRA-55). It covers 55 years, extending back to 1958, when the global radiosonde observing system was established. Many of the deficiencies found in the first Japanese reanalysis, the Japanese 25-year Reanalysis (JRA-25), have been improved. It aims at providing a comprehensive atmospheric dataset that is suitable for studies of climate change or multi-decadal variability, by producing a more time-consistent dataset for a longer period than JRA-25.Production of JRA-55 started in 2010, and computations for more than 16 years have been completed as of August 2011. The entire JRA-55 production will be completed in early 2013 and thereafter JRA-55 will be continued as a new JCDAS on real time basis. This paper is a brief report to introduce the JRA-55 reanalysis project. The data assimilation and prediction (DA) system used in JRA-55 is introduced and compared to that used in JRA-25. Early results of JRA-55 are presented and discussed, showing general improvements.