As a subset of the Japanese 55-year Reanalysis (JRA-55) project, the Meteorological Research Institute of the Japan Meteorological Agency has conducted a global atmospheric reanalysis that assimilates only conventional surface and upper air observations, with no use of satellite observations, 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, unaffected by changes in historical satellite observing systems. The dataset is intended to be suitable for studies of climate change or multidecadal variability. The reanalysis period of JRA-55C is from November 1972 to December 2012. The JMA recommends the use of JRA-55 to extend JRA-55C back to January 1958.
The Data Support Section at NCAR has downloaded all JRA-55C data. The entire archive has been reorganized into single parameter time series, and model resolution data has been transformed to a regular Gaussian grid. The JRA-55C products are currently being made accessible to RDA registered users of JRA-55, and will appear incrementally via the Data Access tab.
Temporal Range:
1972-10-31 21:00 +0000 to 2013-01-01 00:00 +0000
(Entire dataset)
Period details by dataset productPeriod details by dataset product1981-01-01 00:00 +0000 (JRA-55C 1.25 Degree Constant Fields)1981-01-01 00:00 +0000 (JRA-55C 2.5 Degree Constant Fields)1972-11-01 00:00 +0000 to 2013-01-01 00:00 +0000 (JRA-55C 3-Hourly 1.25 Degree 2-Dimensional Average Diagnostic Fields)1972-11-01 00:00 +0000 to 2012-12-31 21:00 +0000 (JRA-55C 3-Hourly 1.25 Degree 2-Dimensional Instantaneous Diagnostic Fields)1972-11-01 00:00 +0000 to 2013-01-01 00:00 +0000 (JRA-55C 3-Hourly 1.25 Degree Land Surface Average Diagnostic Fields)1972-11-01 00:00 +0000 to 2012-12-31 21:00 +0000 (JRA-55C 3-Hourly 1.25 Degree Land Surface Forecast Fields)1972-11-01 00:00 +0000 to 2012-12-31 21:00 +0000 (JRA-55C 3-Hourly 1.25 Degree Sea Ice Fields)1972-11-01 00:00 +0000 to 2012-12-31 21:00 +0000 (JRA-55C 3-Hourly 1.25 Degree Total Column Forecast Fields)1972-11-01 00:00 +0000 to 2013-01-01 00:00 +0000 (JRA-55C 3-Hourly Model Resolution 2-Dimensional Average Diagnostic Fields)1972-11-01 00:00 +0000 to 2012-12-31 21:00 +0000 (JRA-55C 3-Hourly Model Resolution 2-Dimensional Instantaneous Diagnostic Fields)1972-10-31 21:00 +0000 to 2012-12-31 21:00 +0000 (JRA-55C 3-Hourly Model Resolution 2-Dimensional Minimum-Maximum Diagnostic Fields)1972-11-01 00:00 +0000 to 2013-01-01 00:00 +0000 (JRA-55C 3-Hourly Model Resolution Land Surface Average Diagnostic Fields)1972-11-01 00:00 +0000 to 2012-12-31 21:00 +0000 (JRA-55C 3-Hourly Model Resolution Land Surface Forecast Fields)1972-11-01 00:00 +0000 to 2012-12-31 21:00 +0000 (JRA-55C 3-Hourly Model Resolution Sea Ice Fields)1972-11-01 00:00 +0000 to 2012-12-31 21:00 +0000 (JRA-55C 3-Hourly Model Resolution Total Column Forecast Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly 1.25 Degree Isentropic Analysis Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly 1.25 Degree Isobaric Analysis Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly 1.25 Degree Isobaric Forecast Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly 1.25 Degree Land Surface Analysis Fields)1972-11-01 18:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly 1.25 Degree Snow Depth Analysis Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly 1.25 Degree Surface Analysis Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly 1.25 Degree Total Column Analysis Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly 2.5 Degree Isobaric Analysis Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly 2.5 Degree Isobaric Forecast Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly Model Resolution Isentropic Analysis Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly Model Resolution Land Surface Analysis Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly Model Resolution Model Level Analysis Fields)1972-11-01 18:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly Model Resolution Snow Depth Analysis Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly Model Resolution Surface Analysis Fields)1972-11-01 00:00 +0000 to 2012-12-31 18:00 +0000 (JRA-55C 6-Hourly Model Resolution Total Column Analysis Fields)1981-01-01 00:00 +0000 (JRA-55C Model Resolution Constant Fields)
Usage Restrictions:
When accessing the JRA data, you agree to the following Terms and Conditions:
a. Conditions of use
Individual users must register their name, affiliation and email address with NCAR before access to datasets will be permitted.
The source of the datasets should be duly acknowledged in scientific and technical papers, publications, press releases and other communications regarding the datasets.
Example: The dataset used for this study is from the Japanese 55-year Reanalysis Using Conventional Data Only (JRA-55C) project carried out by the Japan Meteorological Agency (JMA).
Individual users should provide JMA (jra@met.kishou.go.jp) with a copy of their scientific or technical papers, publications, press releases or other communications regarding these datasets.
b. Disclaimer
Although JMA has taken the utmost care in creating the datasets, it assumes no responsibility regarding their reliability. JMA is not responsible for any damage that may result from their use.
c. Intellectual property
The intellectual property rights of the datasets belong exclusively to JMA.
The complete JMA and NCAR agreement for JRA-55 (and JRA-55C) may be viewed via the Documentation tab.
Longitude Range: Westernmost=180W Easternmost=180E
Latitude Range: Southernmost=90S Northernmost=90N
Detailed coverage informationDetailed coverage information0.562° x ~0.562° from 0E to 359.438E and 89.57N to 89.57S (640 x 320 Longitude/Gaussian Latitude)0.563° x ~0.562° from 0E to 359.438E and 89.57N to 89.57S (640 x 320 Longitude/Gaussian Latitude)1.25° x 1.25° from 0E to 358.75E and 90N to 90S (288 x 145 Longitude/Latitude)2.5° x 2.5° from 0E to 357.5E and 90N to 90S (144 x 73 Longitude/Latitude)
Onogi, K., J. Tsutsui, H. Koide, M. Sakamoto, S. Kobayashi, H. Hatsushika, T. Matsumoto, N. Yamazaki, H. Kamahori, K. Takahashi, S. Kadokura, K. Wada, K. Kato, R. Oyama, T. Ose, N. Mannoji, and R. Taira, 2007: The JRA-25 Reanalysis. J. Met. Soc. Jap., 85(3), 369-432 (DOI: 10.2151/jmsj.85.369).
Total Volume:
16.78 TB
(Entire dataset)
Volume details by dataset productVolume details by dataset productJRA-55C 6-Hourly Model Resolution Total Column Analysis Fields: 120.21 GBJRA-55C 6-Hourly 1.25 Degree Total Column Analysis Fields: 18.41 GBJRA-55C 6-Hourly Model Resolution Isentropic Analysis Fields: 3.26 TBJRA-55C 6-Hourly 1.25 Degree Isentropic Analysis Fields: 666.31 GBJRA-55C 6-Hourly Model Resolution Land Surface Analysis Fields: 67.52 GBJRA-55C 6-Hourly 1.25 Degree Land Surface Analysis Fields: 10.92 GBJRA-55C 6-Hourly Model Resolution Model Level Analysis Fields: 6.49 TBJRA-55C 6-Hourly 1.25 Degree Isobaric Analysis Fields: 1.52 TBJRA-55C 6-Hourly 2.5 Degree Isobaric Analysis Fields: 385.71 GBJRA-55C 6-Hourly Model Resolution Snow Depth Analysis Fields: 2.41 GBJRA-55C 6-Hourly 1.25 Degree Snow Depth Analysis Fields: 390.04 MBJRA-55C 6-Hourly Model Resolution Surface Analysis Fields: 168.29 GBJRA-55C 6-Hourly 1.25 Degree Surface Analysis Fields: 33.14 GBJRA-55C 3-Hourly Model Resolution Total Column Forecast Fields: 384.67 GBJRA-55C 3-Hourly 1.25 Degree Total Column Forecast Fields: 58.92 GBJRA-55C 3-Hourly Model Resolution Land Surface Forecast Fields: 250.79 GBJRA-55C 3-Hourly 1.25 Degree Land Surface Forecast Fields: 40.56 GBJRA-55C 6-Hourly 1.25 Degree Isobaric Forecast Fields: 533.93 GBJRA-55C 6-Hourly 2.5 Degree Isobaric Forecast Fields: 135.09 GBJRA-55C 3-Hourly Model Resolution 2-Dimensional Average Diagnostic Fields: 1.39 TBJRA-55C 3-Hourly 1.25 Degree 2-Dimensional Average Diagnostic Fields: 191.48 GBJRA-55C 3-Hourly Model Resolution Land Surface Average Diagnostic Fields: 96.46 GBJRA-55C 3-Hourly 1.25 Degree Land Surface Average Diagnostic Fields: 15.6 GBJRA-55C 3-Hourly Model Resolution 2-Dimensional Instantaneous Diagnostic Fields: 625.09 GBJRA-55C 3-Hourly 1.25 Degree 2-Dimensional Instantaneous Diagnostic Fields: 103.1 GBJRA-55C 3-Hourly Model Resolution Sea Ice Fields: 48.08 GBJRA-55C 3-Hourly 1.25 Degree Sea Ice Fields: 5.48 GBJRA-55C 3-Hourly Model Resolution 2-Dimensional Minimum-Maximum Diagnostic Fields: 144.25 GBJRA-55C 1.25 Degree Constant Fields: 0.25 MBJRA-55C 2.5 Degree Constant Fields: 0.06 MBJRA-55C Model Resolution Constant Fields: 1.23 MB
Citation counts are compiled through information provided by publicly-accessible APIs according to the guidelines developed through the https://makedatacount.org/ project. If journals do not provide citation information to these publicly-accessible services, then this citation information will not be included in RDA citation counts. Additionally citations that include dataset DOIs are the only types included in these counts, so legacy citations without DOIs, references found in publication acknowledgements, or references to a related publication that describes a dataset will not be included in these counts.