The Japanese Reanalysis forThree Quarters of a Century
1. IDENTIFICATION INFORMATIONName

The Japanese Reanalysis for Three Quarters of a Century

Abbreviation

JRA-3Q

DOI

doi:10.20783/DIAS.645 [https://doi.org/10.20783/DIAS.645]

Metadata
Identifier

JRA3Q20231102085946-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 OfficeOrganization

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
2023-11-02

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6. DATE OF DATASET
�publication : 2022-12-09

7. DATASET OVERVIEW
7.1 Abstract
The Japan Meteorological Agency is currently conducting the Japanese Reanalysis for Three Quartersof a Century (JRA-3Q), which covers the period from September 1947 onward to extend the current
period of data coverage and improve the quality of long-term reanalysis. The project involves
a sophisticated data assimilation system (based on the operational set-up as of December 2018)
incorporating development results from the operational NWP system and sea surface temperature
analysis achieved since the Japanese 55-year Reanalysis (JRA-55, based on the operational set-up
as of December 2009). New datasets of past observations are also assimilated, including rescued
historical observations and reprocessed satellite data supplied by meteorological and satellite
centers worldwide. Many of the deficiencies of JRA-55 are alleviated in JRA-3Q, providing a highquality homogeneous reanalysis dataset that covers the previous 75 years.

7.2 Topic Category(ISO19139)
�climatologyMeteorologyAtmosphere

7.3 Temporal Extent
Begin Date

1947-09-01

End Date

Under Continuation

7.4 Geographic Bounding Box
Northlatitudebound 90Westlongitudebound -180

Eastboundlongitude

180

South
latitudebound -90

7.5 Grid
Dimension NameDimension
Size Resolution Unit
(slice number ofthe dimension)

row40 (km)column480

40 (km)vertical100

0.02-25 (hPa)

7.6 Geographic Description

2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

theme

Climate, Weather

GEOSS

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

Keyword

KeywordNamethesaurus

theme

DIAS &amp;gt; Data Integration and Analysis System

No_Dictionary

7.8 Online Resource�JRA project website : https://jra.kishou.go.jp/
�JRA-3Q Data Format (in English) : https://jra.kishou.go.jp/JRA-3Q/index_en.html#FORMAT�JRA-3Q Data Format (in Japanese) : https://jra.kishou.go.jp/JRA-3Q/index_ja.html#FORMAT�Quality issues (in English) : https://jra.kishou.go.jp/JRA-3Q/index_en.html#QUALITY
�Quality issues (in Japanese) : https://jra.kishou.go.jp/JRA-3Q/index_ja.html#QUALITY
�file download : https://data.diasjp.net/dl/storages/filelist/dataset:645

7.9 Data Environmental Information
7.10 Distribution Information
nameversion

GRIB

2specification

8. DATA PROCESSING
9. DATA REMARKS
10. DATA POLICY3

10.1 Data Policy by the Data Provider
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. LICENSEInternational

CC-BY-NC-SA 4.0 : Creative Commons Attribution-NonCommercial-ShareAlike 4.0[https://creativecommons.org/licenses/by-nc-sa/4.0/]

12. DATA SOURCE ACKNOWLEDGEMENT
12.1 Acknowledge the Data Provider
JRA-3Q data should be acknowledged in scientific and technical reports.
Example"This report references JRA-3Q reanalysis data from the Japan Meteorological Agency."

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
Kosaka Y., S. Kobayashi, Y. Harada, C. Kobayashi, H. Naoe, K. Yoshimoto, M. Harada, N. Goto, J.
Chiba, K. Miyaoka, R. Sekiguchi, M. Deushi, H. Kamahori, T. Nakaegawa; T. Y.Tanaka, T. Tokuhiro,4

Y. Sato, Y. Matsushita, and K. Onogi, 2024: The JRA-3Q reanalysis. J. Meteor. Soc. Japan, 102,
https://doi.org/10.2151/jmsj.2024-004.

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