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One-Line Description:

  • NOAA High-resolution Blended Analysis of Daily SST and Ice (using AVHRR only).

Temporal Coverage:

  • Daily values for 1985/01/04 - present.

Spatial Coverage:

  • 0.25 degree latitude x 0.25 degree longitude global grid (720x1440).
  • 89.875S - 89.875N, 0.125E - 359.875E.


  • Sea Surface

Update Schedule:

  • Weekly

Download/Plot Data:

Variable Statistic Level Download File Create Plot/Subset
Daily sea surface temperature Daily Mean Surface /Datasets.private2/noaahighres/sst.day.mean.yyyy.nc
Estimated error standard deviation of analysed_sst Daily Mean Surface /Datasets.private2/noaahighres/sst.day.mean.err.yyyy.nc
Sea ice concentration Daily Mean Surface /Datasets.private2/noaahighres/icec.day.mean.err.yyyy.nc

Usage Restrictions:

  • None

Detailed Description:

  • The SST analysis is computed daily on a 0.25 degree latitude/longitude grid. This is version 1.0. There are two products with different satellite data; we are archiving the AVHRR version as it is starts earlier (NOAA refers to it as the AVHRR product). The data use in situ data from ships and buoys. SSTs are generated for sea-ice concentrations above 50%. The sea ice for 1985-2004 is from http://nsidc.org/data/nsidc-0051.html (Cavalieri D., C. Parkinson, P. Gloerson, and H.J. Zwally. 1997, updated 2005. Sea ice concentrations from Nimbus-7 SMMR and DMSP SSM/I passive microwave data, June to September 2001. Boulder, CO, USA). The sea ice from 2005 to present is from http://polar.ncep.noaa.gov/seaice/ (Grumbine, R. W., 1996: Automated passive microwave sea ice concentration analysis at NCEP, 13pp. Unpublished manuscript available from NCEP/NWS/NOAA, 5200 Auth Road, Camp Springs, MD, 20746, USA.)

    NODC's AVHRR Pathfinder Version 5 is the satellte data used. http://pathfinder.nodc.noaa.gov for January 3, 1985 though December 31, 2005 and the operational US Navy AVHRR data (May, D.A., M. M. Parmeter, D. S. Olszewski and B. D. McKenzie, 1998: Operational processing of satellite sea surface temperature retrievals at the Naval Oceanographic Office, Bull. Amer. Met. Soc., 79, 397-407) from January 1, 2006, through present. This product will henceforth be referred to as the AVHRR product.

    The analysis includes a bias correction of the satellite data with respect to in situ data using an empirical orthogonal teleconnection (EOT) algorithm. A description of the complete analysis procedure can be found in the paper by Reynolds et. al 2006: Daily High-resolution Blended Analyses. (ftp://eclipse.ncdc.noaa.gov/pub/OI-daily/daily-sst.pdf).


  • None

Related File Naming & Structure Information:

File Names:

  • var.day.mean<.err>.yyyy.nc   (In directory: /Datasets.private2/noaahighres/)

Dataset Format and Size:

  • PSD standard NetCDF 759 Mbyte yearly file for each daily mean file (packed).

Missing Data:

  • Missing data is flagged with a value of 32767s.


  • Please note: If you acquire NOAA High-resolution data products from PSD, we ask that you acknowledge us in your use of the data. This may be done by including text such as NOAA High-resolution data provided by the NOAA/OAR/ESRL PSD, Boulder, Colorado, USA, from their Web site at http://www.esrl.noaa.gov/psd/ in any documents or publications using these data. We would also appreciate receiving a copy of the relevant publications. This will help PSD to justify keeping the NOAA High-resolution data set freely available online in the future. Thank you!


Original Source:


  • Physical Sciences Division: Data Management
    325 Broadway
    Boulder, CO 80305-3328