The Japanese 55-year Reanalysis "JRA-55": An Interim Report
The Japanese 55-year Reanalysis "JRA-55": An Interim Report
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DOI：
10.2151/sola.2011-038
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发表时间：
2011-01-01
期刊：
影响因子：
1.9
通讯作者：
Ishimizu, Takahisa
中科院分区：
文献类型：
--
作者：
Ebita, Ayataka;Kobayashi, Shinya;Ishimizu, Takahisa
日本气象厅（JMA）启动了第二个日本全球大气再分析项目，名为日本55年再分析（JRA-55）。它涵盖了55年，追溯到1958年，当时建立了全球无线电探空仪观测系统。在日本第一次再分析，日本25年再分析（JRA-25）中发现的许多不足之处已经得到改进。JRA-55的目标是提供一个全面的大气数据集，适用于气候变化或多年代际变率的研究，通过产生一个比JRA-25更长时期的时间一致的数据集。整个JRA-55的生产将在2013年初完成，此后JRA-55将作为新的JCDAS在真实的时间基础上继续生产。本文是JRA-55再分析计划的简要报告。介绍了JRA-55中使用的资料同化和预报（DA）系统，并与JRA-25中使用的DA系统进行了比较。介绍并讨论了JRA-55的早期结果，显示了总体改进。
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.