The Japanese 55-year Reanalysis
using conventional data only (JRA-55C)
1. IDENTIFICATION INFORMATIONName

The Japanese 55-year Reanalysis using conventional data only (JRA-55C)

Abbreviation

JRA-55C

Metadata
Identifier

JRA55_C20230727071418-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 SystemName

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

Climate Research Department

Organization

Meteorological Research Institute

5. DATE OF THIS DOCUMENT
2023-07-27

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6. DATE OF DATASET
�publication : 2014-10-01

7. DATASET OVERVIEW
7.1 Abstract
As a subset of the Japanese 55-year Reanalysis (JRA-55) project, the Meteorological ResearchInstitute of the Japan Meteorological Agency is conducting a global atmospheric reanalysis that
assimilates only conventional surface and upper air observations, with no use of satelliteobservations, using the same data assimilation system as the JRA-55. The project, named the JRA-55
Conventional (JRA-55C), aims to produce a more homogeneous dataset over a long period, unaffectedby changes in historical satellite observing systems. The dataset is intended to be suitable forstudies of climate change or multi-decadal variability. The reanalysis period of the JRA-55C isfrom 1958 to 2012. Note, however, that the data for the period from 1958 to Oct 1972 are exactly
the same of JRA-55. We recommend to use together with the JRA-55 data in the period.
(A part of JRA-55C data included an error. We replaced the error data to the corrected data on 23
March 2016. The details are described at "Data Remarks".)

7.2 Topic Category(ISO19139)
�climatologyMeteorologyAtmosphere

7.3 Temporal Extent
Begin Date

1972-11-01

End Date

2012-12-31

7.4 Geographic Bounding Box
Northlatitudebound 90

Westlongitude

bound -180

Eastboundlongitude

180Southlatitude

bound -90

7.5 GridDimension NameDimension
Size Resolution Unit
(slice number ofthe dimension)

row2881.25 (deg)column145

1.25 (deg)vertical37

1-50 (hPa)27.6 Geographic Description
7.7 Keywords
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

themeClimate, WeatherGEOSS

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

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:229
�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

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specification

8. DATA PROCESSING
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9. DATA REMARKS
A part of JRA-55C data from Jan 2005 to Aug 2005 included an error. We replaced the error data to thecorrected data on 23 March 2016. Please download the data again from DIAS with the updated versions.
The replaced are the following files.
(${mm}: 01,02,03,04,05,06,07,08.
${hh}: 00,03,06,09,12,15,18,21)
All files underJRA-55C/Hist/Daily/fcst_column125/2005${mm}/JRA-55C/Hist/Daily/fcst_phy2m125/2005${mm}/JRA-55C/Hist/Daily/fcst_surf125/2005${mm}/All files which begin in "fcst_p125_ciwc", "fcst_p125_clwc" and "fcst_p125_ozone" underJRA-55C/Hist/Daily/fcst_p125/2005${mm}/All files which are over in "2005${mm}" or ".idx" underJRA-55C/Hist/Monthly/fcst_column125/
JRA-55C/Hist/Monthly/fcst_phy2m125/
JRA-55C/Hist/Monthly/fcst_surf125/
All files which begin in "fcst_p125_ciwc", "fcst_p125_clwc", "fcst_p125_ozone" and are over in"2005${mm}" or ".idx" underJRA-55C/Hist/Monthly/fcst_p125/
All files which are over in "2005${mm}_${hh}" or ".idx" underJRA-55C/Hist/Monthly_diurnal/fcst_column125/
JRA-55C/Hist/Monthly_diurnal/fcst_phy2m125/
JRA-55C/Hist/Monthly_diurnal/fcst_surf125/
All files which begin in "fcst_p125_ciwc", "fcst_p125_clwc", "fcst_p125_ozone" and are over in"2005${mm}_${hh}" or ".idx" underJRA-55C/Hist/Monthly_diurnal/fcst_p125/
All files underJRA-55C/Clim8110/Daily/fcst_column125/
JRA-55C/Clim8110/Daily/fcst_phy2m125/
JRA-55C/Clim8110/Daily/fcst_surf125/
All files which begin in "fcst_p125_ciwc", "fcst_p125_clwc" and "fcst_p125_ozone" underJRA-55C/Clim8110/Daily/fcst_p125/

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All files underJRA-55C/Clim8110/Monthly/fcst_column125/
JRA-55C/Clim8110/Monthly/fcst_phy2m125/
JRA-55C/Clim8110/Monthly/fcst_surf125/
All files which begin in "fcst_p125_ciwc", "fcst_p125_clwc" and "fcst_p125_ozone" underJRA-55C/Clim8110/Monthly/fcst_p125/

10. DATA POLICY
10.1 Data Policy by the Data Provider(1) Users should provide user information including name, affiliation, e-mail address.
(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.

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.

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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 System
If 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(1) Kobayashi, C., H. Endo, Y. Ota, S. Kobayashi, H. Onoda, Y. Harada, K. Onogi and H. Kamahori,2014: Preliminary results of the JRA-55C, an atmospheric reanalysis assimilating conventional
observations only. , SOLA, 10, 78-82, doi: 10.2151/sola.2014-016.
(2) Kobayashi, S., Y. Ota, Y. 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
and Basic Characteristics. 93, 5-48, doi: 10.2151/jmsj.2015-001.

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