Usage Restrictions: non-commercial use only

Reference: Ishii, M., A. Nishimura, S. Yasui, and S. Hirahara, 2025: Historical High-Resolution Daily SST Analyses with Consistency to Monthly Land Surface Air Temperature. J. Meteor. Soc. Japan 103(1), 17–44. doi:10.2151/jmsj.2024-010.

COBE3 products:

1) COBE-SST3

   https://climate.mri-jma.go.jp/~ishii/COBE3/cobe-sst3/{daily|monthly|perturb}
   netCDF
   1850 - 2024
   1/4 degree
   Note.  Perturbations are available for yeas from 1890 to 2020, and, those after 2020 will be provided as requested.

   https://climate.mri-jma.go.jp/~ishii/COBE3/cobe-sst3/1x1/{monthly|perturb}
   netCDF
   1850 - 2024
   1 degree
   processed from 1/4 deg. COBE-SST3

2) COBE-SST3H

   https://climate.mri-jma.go.jp/~ishii/COBE3/cobe-sst3h/
   netCDF
   1982 - 2020
   1/4 degree

3) COBE-LSAT3

   https://climate.mri-jma.go.jp/~ishii/COBE3/cobe-lsat3/
   netCDF
   1850 - 2024
   1 degree

4) NMAT correction used in SST bias correction (Sec. 3.2)

   https://climate.mri-jma.go.jp/~ishii/COBE3/correction/nmat.nc
   netCDF
   1890 - 1950

5) COBE-STEMP3

   Note. SST grid preference, that is, SST values were embedded at the grid points where both SST and LSAT are available.

   https://climate.mri-jma.go.jp/~ishii/COBE3/cobe-stemp3/
   netCDF
   1850 - 2024
   1 degree
   combined COBE-SST3 and COBE-LSAT3

6) LAND-SEA MASK

   https://climate.mri-jma.go.jp/~ishii/COBE3/mask
   netCDF


Additional info on contents

     sst : Sea Surface Temperature [ degree Celsius ]
     err : One sigma error  [ Kelvin ]
     sic : Fractional sea ice coverage [ 0 - 1 ]
     da  : Data availability
           For daily SST, da is set to be undef (unavailable) or 1 (available)
           For monthly SST, da is the number of data-available days in the month. Undef denotes no observations.


ishii 2023/12/18
      2024/6/17
      2024/11/19 - cobe-stemp3 added
      2024/12/03 - mask data added
      2025/5/29  - Additional info on contents
      2025/8/19  - Usage Restrictions added
      2025/10/1  - monthly 1 deg. COBE-SST3 and its perturbations newly added
                 - COBE-SST3 for 2006 - 2024 updated.
                 - "da" in monthly 0.25 deg. COBE-SST3 corrected.
                 - COBE-SST3 perturbations of years 1983 - 2020 in members #051 - #099 and #178 - #266 corrected/added as previously incomplete/missing.
                 - nat.nc in "correction" directory renamed nmat.nc