JRA-55 based surface dataset for driving ocean-sea ice models (JRA55-do)
Notice
Updating of JRA55-do was discontinued on 31 January 2024, as JRA-55, on which JRA55-do is based, terminated its service.
The final version (v1.6.0) covering the entire period (01Jan1958-01Feb2024) is available from
input4MIPs.
Contents are the same as v1.5.0 and v1.5.0.1.
Introduction
JRA55-do (
Tsujino et al., 2018) is a surface dataset for driving ocean-sea ice models and used in phase 2 of OMIP (OMIP-2). JRA55-do corrects the atmospheric reanalysis product JRA-55 (
Kobayashi et al., 2015) using satellite and other atmospheric reanalysis products. The merits of JRA55-do are the high horizontal resolution (~55 km) and temporal interval (3 h). An assessment by
Tsujino et al. (2020) implies that JRA55-do can suitably replace the current CORE/OMIP-1 dataset.
Dataset status, versions, and history
Version 1.6 (final version)
Download
- v1.6.0 (v20240531): temporal coverage is 01Jan1958 - 01Feb2024.
- Dataset is available through input4MIPs.
- To search, select "MIP Era" = "CMIP6Plus", "Target MIP" = "OMIP", "Institution ID" = "MRI", and "Source Version" = "1.6.0" among tabs on the left side.
- Get "WGET script" for each variable and use it to download the data.
User guide
- User guide of JRA55-do-v1.6 is available from here.
Version 1.5
About version 1.5
- Version 1.5 includes the following two fixes relative to version 1.4:
- The surface atmospheric fields around the erroneously (anti-cyclonically) rotating tropical cyclones that originate from the raw JRA-55 are replaced with those from 20CRv3 (Slivinski et al., 2019).
- The surface meteorological variables (specific humidity, air temperature, and wind vector) for the period after 2016 are replaced by those based on the delayed-mode analysis of the COBE-SST dataset, instead of the real-time analysis.
- Version 1.5 is planned to be extended into the future as JRA-55 is extended.
- An OMIP-2 type experiment forced with this version using the MRI model indicates that the overall effect of this correction is very minor.
Download
- v1.5.0 (v20200916): temporal coverage is 01Jan1958 - 15Jul2020.
- Dataset is available through input4MIPs.
- To search, select "Target MIP" = "OMIP", "Institution ID" = "MRI", and "Source Version" = "1.5.0" among tabs on the left side.
- Written with CMOR version 3.6.0.
- Get "WGET script" for each variable and use it to download the data.
- Note:
- A beta version v20200803 that was temporary available from here had some errors and thus has been replaced by v20200916.
- v1.5.0.1: temporal coverage is 01Jan2020 - 01Feb2024.
- This version is a preliminary release extending v1.5.0 to latest.
- Data is available from this server: Click here to access version 1.5.0.1.
- Note:
- The surface meteorological variables (specific humidity, air temperature, and wind vector) for the latest 30 days are preliminary because they are adjusted using the real-time analysis of the COBE-SST dataset. They are sequentially (day-by-day) replaced by final ones as the delayed-mode analysis of the COBE-SST dataset becomes available.
- There may be delays without prior notice during the New Year holidays and computer system maintenance in MRI.
User guide
- User guide of JRA55-do-v1.5 is available from here.
About errors of JRA-55 that necessitated the production of JRA55-do-v1.5
The original problem is that lots of tropical cyclones are found to have wrong sign of rotation in the JRA-55 analysis, on which JRA55-do is based. JRA55-do has been inevitably affected.
Dates/positions of erroneously represented tropical cyclones are listed in the following:
About production of JRA55-do-v1.5 as a merged JRA55-do-v1.3 and 20CRv3 dataset
- A report on the production of the atmospheric fields of JRA55-do-v1.5 is presented here, with time evolution figures of the corrected fields for all erroneous tropical cyclones.
Documents
Dataset description
Dataset evaluation
JRA-55
20CRv3
User guide
OMIP
Related Codes
- bulk_ncar.F90: Fortran 90 program to compute turbulent fluxes using bulk formula provided by Large and Yeager (2004;2009)
Acknowledgments
The resources to maintain this page are kindly provided by Masayoshi Ishii of MRI.
The JRA55-do project is a project distinct from the JRA-55 project conducted by Japan Meteorological Agency. Feedback should be directed to the authors of the description paper (Tsujino et al. 2018), not to the contact of the JRA-55 or its subsequent projects.
