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GHRSST Level 4 AVHRR_OI Global Blended Sea Surface Temperature Analysis (GDS2) from NCEI

Metadata Updated: December 6, 2023

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.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

Downloads & Resources



Metadata Created Date December 1, 2022
Metadata Updated Date December 6, 2023

Metadata Source

Harvested from NASA Data.json

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Additional Metadata

Resource Type Dataset
Metadata Created Date December 1, 2022
Metadata Updated Date December 6, 2023
Identifier C2036881712-POCLOUD
Data First Published 2020-04-01
Language en-US
Data Last Modified 2020-04-01
Category GHRSST, geospatial
Public Access Level public
Bureau Code 026:00
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Citation NOAA National Centers for Environmental Information. 2020-04-22. Daily L4 in situ and AVHRR OISST 0.25 degree. Version 2.1. Daily L4 Optimally Interpolated SST (OISST) In situ and AVHRR Analysis. National Centers for Environmental Information, Asheville, NC, USA. Archived by National Aeronautics and Space Administration, U.S. Government, PO.DAAC.
Creator NOAA National Centers for Environmental Information
Graphic Preview Description Thumbnail
Graphic Preview File
Harvest Object Id 741325f5-7ace-4d10-b980-5b50fdd5ba61
Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
Harvest Source Title NASA Data.json
Homepage URL
Metadata Type geospatial
Old Spatial -180.0 -90.0 180.0 90.0
Program Code 026:001
Related Documents
Release Place National Centers for Environmental Information, Asheville, NC, USA
Series Name Daily L4 in situ and AVHRR OISST 0.25 degree
Source Datajson Identifier True
Source Hash 484ac5f5c2e84f7594d2fc9b372489b92177c5b0dbe3a8d52e9d3acf6fc9a9e6
Source Schema Version 1.1
Temporal 2016-01-01T00:00:00Z/2023-02-28T00:00:00Z

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