GHRSST Level 4 AVHRR_OI Global Blended Sea Surface Temperature Analysis from NCEI (GDS versions 1 and 2)

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A Group for High Resolution Sea Surface Temperature (GHRSST) global Level 4 sea surface temperature dataset is produced daily on a 0.25 degree grid at the NOAA National Centers for Environmental Information. This product uses optimal interpolation (OI) by interpolating and extrapolating SST observations from different sources, resulting in a smoothed complete field. The sources of data are satellite (AVHRR) and in situ platforms (i.e., ships, buoys, and Argo floats above 5m depth), and the specific datasets employed may change over time. In the regions with sea-ice concentration higher than 30%, freezing points of seawater are used to generate proxy SSTs. A preliminary version of this dataset is produced in near-real time (1-day latency), and then replaced with a final version after 2 weeks. The v2.1 (Huang et al. 2021) is updated from the previous AVHRR_OI-NCEI-L4-GLOB-v2.0 data. Major improvements include: 1) In-situ ship and buoy data changed from the NCEP Traditional Alphanumeric Codes (TAC) to the NCEI merged TAC + Binary Universal Form for the Representation (BUFR) data, with large increases of buoy data included to correct satellite SST biases; 2) Addition of Argo float observed SST data as well, for further correction of satellite SST biases; 3) Satellite input from the METOP-A and NOAA-19 to METOP-A and METOP-B, removing degraded satellite data; 4) Revised ship-buoy SST corrections for improved accuracy; and 5) Revised sea-ice-concentration to SST conversion to remove warm biases in the Arctic region. These updates only apply to data after January 1st, 2016. The data pre 2016 are still the same as v2.0 except for metadata upgrades. NCEI has panned to update the entire dataset from 1982 to fix the In-Situ data ingest and bias correction which exist prior 2016.
  • Cite as: NOAA National Centers for Environmental Information (NCEI); US National Climatic Data Center (NCDC) (2007). GHRSST Level 4 AVHRR_OI Global Blended Sea Surface Temperature Analysis from NCEI (GDS versions 1 and 2). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/GHRSST-AVHRR_OI-NCEI-L4-GLOB. Accessed [date].
gov.noaa.nodc:GHRSST-AVHRR_OI-NCEI-L4-GLOB
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Distribution Formats
  • netCDF (Version: netCDF-3)
    • File Specification: GDS-1.0r1.7, CF-1.0
    • File Compression: bzip2
  • netCDF (Version: netCDF-4)
    • File Specification: GDS-2.0r5, ACDD-1.3, CF-1.6
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DistributorNOAA National Centers for Environmental Information
+1-301-713-3277
NCEI.Info@noaa.gov
Dataset Point of Contact NOAA National Centers for Environmental Information
ncei.info@noaa.gov
Time Period1981-09-01 to Present
Spatial Bounding Box Coordinates
N: 90
S: -90
E: 180
W: -180
Spatial Coverage Map
General Documentation
Associated Resources
Publication Dates
  • publication: 2007-06-30
  • revision: 2024-03-02
Data Presentation Form Digital table - digital representation of facts or figures systematically displayed, especially in columns
Dataset Progress StatusOngoing - data is continually being updated
Historical archive - data has been stored in an offline storage facility
Data Update Frequency Daily
Supplemental Information
This collection includes data from the following product(s): GHRSST Level 4 AVHRR_OI Global Blended Sea Surface Temperature Analysis (GDS2) from NCEI (AVHRR_OI-NCEI-L4-GLOB-v2.1); GHRSST Level 4 AVHRR_OI Global Blended Sea Surface Temperature Analysis (NCDC-L4LRblend-GLOB-AVHRR_OI); GHRSST Level 4 AVHRR_OI Global Blended Sea Surface Temperature Analysis (GDS version 2) from NCEI (AVHRR_OI-NCEI-L4-GLOB-v2.0).
PurposeThis dataset is available to the public for a wide variety of uses including scientific research and analysis.
Use Limitations
  • accessLevel: Public
  • Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
Dataset Citation
  • Cite as: NOAA National Centers for Environmental Information (NCEI); US National Climatic Data Center (NCDC) (2007). GHRSST Level 4 AVHRR_OI Global Blended Sea Surface Temperature Analysis from NCEI (GDS versions 1 and 2). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/GHRSST-AVHRR_OI-NCEI-L4-GLOB. Accessed [date].
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Theme keywordsNODC DATA TYPES THESAURUS NODC OBSERVATION TYPES THESAURUS WMO_CategoryCode
  • oceanography
GHRSST Project Science Keywords
  • Earth Science > Oceans > Ocean Temperature > Sea Surface Temperature > Blended Sea Surface Temperature
Global Change Master Directory (GCMD) Science Keywords
Data Center keywordsNODC COLLECTING INSTITUTION NAMES THESAURUS NODC SUBMITTING INSTITUTION NAMES THESAURUS Global Change Master Directory (GCMD) Data Center Keywords
Platform keywordsNODC PLATFORM NAMES THESAURUS Global Change Master Directory (GCMD) Platform Keywords ICES/SeaDataNet Ship Codes Provider Platforms
  • Argo profiling float
Instrument keywordsNODC INSTRUMENT TYPES THESAURUS Global Change Master Directory (GCMD) Instrument Keywords
Place keywordsNODC SEA AREA NAMES THESAURUS Global Change Master Directory (GCMD) Location Keywords
Project keywordsNODC PROJECT NAMES THESAURUS Global Change Master Directory (GCMD) Project Keywords
KeywordsNCEI ACCESSION NUMBER