The Japanese 55year Reanalysis (JRA-55)
1. IDENTIFICATION INFORMATIONName

The Japanese 55-year Reanalysis (JRA-55)

Metadata
Identifier

JRA5520240221120009-DIAS20221121113753-en

2. CONTACT
2.1 CONTACT on DATASET
Name

Numerical Prediction Division, Information Infrastructure Department

Organization

Japan Meteorological Agency

Address

3-6-9 Toranomon, Minato City, Tokyo, 105-8431, Japan

E-mailjra@met.kishou.go.jp

2.2 CONTACT on PROJECT
2.2.1 Data Integration and Analysis System
Name

DIAS Office

Organization

Japan Agency for Marine-Earth Science and Technology

Address

3173-25, Showa-Cho, Kanazawa-ku, Yokohama-shi, Kanagawa, 236-0001, Japan

E-maildias-office@diasjp.net

3. DOCUMENT AUTHOR
Name

Numerical Prediction Division, Information Infrastructure Department

Organization

Japan Meteorological Agency

4. DATASET CREATOR
Name

Numerical Prediction Division, Information Infrastructure Department

Organization

Japan Meteorological Agency

5. DATE OF THIS DOCUMENT
2024-02-21

6. DATE OF DATASET
1�publication : 2013-10-01

7. DATASET OVERVIEW
7.1 Abstract
Reanalysis of long-term records of past observations with a state-of-the-art numerical analysis
and weather prediction (NWP) system aims at producing a high quality, honogeneous data set forclimate variables such as temperature and precipitation.
The Japan Meteorological Agency has conducted the second reanalysis project named the Japanese 55year Reanalysis (JRA-55) using a more sophisticated NWP system, which is based on the operational
system as of December 2009, and newly prepared past observations. The reanalysis period has been
extended covering the period from 1958 to 2012. JRA-55 is a data set that aims at reproducing theclimate change over the past half century more accurately.

7.2 Topic Category(ISO19139)
�climatologyMeteorologyAtmosphere

7.3 Temporal Extent
Begin Date

1958-01-01

End Date

2024-02-02

7.4 Geographic Bounding Box
Northlatitudebound 90

Westlongitude

bound -180

Eastboundlongitude

180

South
latitudebound -90

7.5 Grid
Dimension Name

Dimension
Size Resolution Unit
(slice number ofthe dimension)

row

288

1.25 (deg)column145

1.25 (deg)vertical37

1-50 (hPa)

7.6 Geographic Description
7.7 Keywords

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7.7.1 Keywords on Dataset
Keyword Type

Keyword

KeywordName

thesaurus

theme

Atmosphere

GCMD_sciencetheme

Aircraft, Balloons/Rockets, Earth Observation Satellites, GCMD_platform
In Situ Land-based Platforms, In Situ Ocean-based
Platforms, Models > , Navigation Platforms

theme

Climate, WeatherGEOSS

7.7.2 Keywords on Project
7.7.2.1 Data Integration and Analysis System
Keyword Type

Keyword

KeywordName

thesaurus

theme

DIAS &amp;gt; Data Integration and Analysis System

No_Dictionary

7.8 Online Resource�JRA project website : http://jra.kishou.go.jp/
�JRA-55 Product Users Handbook (in English) : http://jra.kishou.go.jp/JRA-55/index_en.html#manual�JRA-55 Product Users Handbook (in Japanese) : http://jra.kishou.go.jp/JRA-55/index_ja.html#manual�file download : https://data.diasjp.net/dl/storages/filelist/dataset:204
�Quality issues (in English) : http://jra.kishou.go.jp/JRA-55/index_en.html#quality
�Quality issues (in Japanese) : http://jra.kishou.go.jp/JRA-55/index_ja.html#quality

7.9 Data Environmental Information
7.10 Distribution Information
nameversion

GRIB

1specification

8. DATA PROCESSING
8.1 Data Processing (1)8.1.1 General Explanation of the data producer's knowledge about thelineage of a dataset
In the report released on 2 October 2018, JMA announced that a part of the Japanese 55-year
Reanalysis (JRA-55) product was missing, of which values were set to zero.
Those missing data has been replaced with corrected data. (2018-10-15)

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8.1.2 Data Source
Data Source Citation Name

Description of derived parameters and processing
techniques used

8.2 Data Processing (2)8.2.1 General Explanation of the data producer's knowledge about thelineage of a dataset
It was recently found that a part of the Japanese 55-year Reanalysis(JRA-55) product was missing, of which values were set to zero. Those
missing data are as follows. Product : fcst_surf125 (1.25-degree two-dimensional instantaneous
diagnostic fields)
Period : from 4 June 2018 onward
Parameters : pressure reduced to MSL, total cloud cover, high cloud cover, medium cloud cover,and low cloud cover
The above mentioned product will be replaced with corrected data shortly,
which will be announced separately on the JRA-55 website. In the meantime,users are advised to refrain from using those data. (2018-10-02)

8.2.2 Data Source
Data Source Citation Name

Description of derived parameters and processing
techniques used

9. DATA REMARKS
10. DATA POLICY
10.1 Data Policy by the Data Provider(1) Users should provide user information including name, affiliation, e-mail address and purposeof data use.
(2) Users should not distribute the Products to any third party without JMA's prior consent. Useof the Products for any commercial purposes is also prohibited.
(3) The source of the Products should be duly acknowledged in scientific or technical papers,
publications, press releases or other communications regarding the Products.
(4) Users should provide JMA with a copy of their scientific or technical papers, publications,press releases or other communications regarding the Products.
Disclaimer
Please note that although JMA has paid the closest attention to produce the Products, JMA assumes
no responsibility regarding the reliability of the Products. JMA is not responsible to you for any
damage that may be caused by the use of the Products on this site.

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10.2 Data Policy by the Project
10.2.1 Data Integration and Analysis System
If data provider does not have data policy, DIAS Terms of Service (https://diasjp.net/en/terms/)
and DIAS Privacy Policy (https://diasjp.net/en/privacy/) apply.
If there is a conflict between DIAS Terms of Service and data provider's policy, the data provider'spolicy shall prevail.

11. LICENSE
12. DATA SOURCE ACKNOWLEDGEMENT
12.1 Acknowledge the Data Provider
The source of the Products should be duly acknowledged in scientific or technical papers,
publications, press releases or other communications regarding the Products.
Example:The datasets used for this study are provided from the Japanese 55-year Reanalysis (JRA-55) project
carried out by the Japan Meteorological Agency (JMA).

12.2 Acknowledge the Project
12.2.1 Data Integration and Analysis SystemIf you plan to use this dataset for a conference presentation, paper, journal article, or reportetc., please include acknowledgments referred to following examples. If the data provider describes
examples of acknowledgments, include them as well.
" In this study, [Name of Dataset] provided by [Name of Data Provider] was utilized. This dataset
was also collected and provided under the Data Integration and Analysis System (DIAS), which wasdeveloped and operated by a project supported by the Ministry of Education, Culture, Sports, Scienceand Technology. "13. REFERENCES
Kobayashi, S., Y. Ota, H. Harada, A. Ebita, M. Moriya, H. Onoda, K. Onogi, H. Kamahori, C. Kobayashi,
H. Endo, K. Miyaoka, and K. Takahashi, 2015: The JRA-55 Reanalysis: General Specifications andBasic Characteristics, J. Met. Soc. Japan, 93, 5-48, doi: 10.2151/jmsj.2015-001.

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