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

(AVHRR_OI-NCEI-L4-GLOB-v2.1)
Version2.1
Processing Level4
Start/Stop Date2016-Jan-01 to Present
Short NameAVHRR_OI-NCEI-L4-GLOB-v2.1
DescriptionA 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.
DOI10.5067/GHAAO-4BC21
MeasurementOCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE
Platform/Sensor
NOAA-11
Platform
Name: National Oceanic & Atmospheric Administration-11 (NOAA-11)
Orbit Period: 102.0 minutes
Inclination Angle: 99.0 degrees
/
AVHRR-2
SENSOR
Name: Advanced Very High Resolution Radiometer-2 (AVHRR-2)
Swath Width: 2400.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

NOAA-14
Platform
Name: National Oceanic & Atmospheric Administration-14 (NOAA-14)
Orbit Period: 102.0 minutes
Inclination Angle: 99.0 degrees
/
AVHRR-2
SENSOR
Name: Advanced Very High Resolution Radiometer-2 (AVHRR-2)
Swath Width: 2400.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

NOAA-9
Platform
Name: National Oceanic & Atmospheric Administration-9 (NOAA-9)
Orbit Period: 102.0 minutes
Inclination Angle: 98.0 degrees
/
AVHRR-2
SENSOR
Name: Advanced Very High Resolution Radiometer-2 (AVHRR-2)
Swath Width: 2400.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

NOAA-16
Platform
Name: National Oceanic & Atmospheric Administration-16 (NOAA-16)
Orbit Period: 102.1 minutes
Inclination Angle: 99.0 degrees
/
AVHRR-3
SENSOR
Name: Advanced Very High Resolution Radiometer-3 (AVHRR-3)
Swath Width: 2400.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

NOAA-17
Platform
Name: National Oceanic & Atmospheric Administration-17 (NOAA-17)
Orbit Period: 101.2 minutes
Inclination Angle: 98.7 degrees
/
AVHRR-3
SENSOR
Name: Advanced Very High Resolution Radiometer-3 (AVHRR-3)
Swath Width: 2400.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

NOAA-19
Platform
Name: National Oceanic & Atmospheric Administration-19 (NOAA-19)
Orbit Period: 102.12 minutes
Inclination Angle: 98.74 degrees
/
AVHRR-3
SENSOR
Name: Advanced Very High Resolution Radiometer-3 (AVHRR-3)
Swath Width: 2400.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

METOP-A
Platform
Name: Meteorological Operational Satellite - A (METOP-A)
Orbit Period: 101.3 minutes
Inclination Angle: 98.7 degrees
/
AVHRR-3
SENSOR
Name: Advanced Very High Resolution Radiometer-3 (AVHRR-3)
Swath Width: 2400.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

METOP-B
Platform
Name: Meteorological Operational Satellite - B (METOP-B)
Orbit Period: 101.3 minutes
Inclination Angle: 98.7 degrees
/
AVHRR-3
SENSOR
Name: Advanced Very High Resolution Radiometer-3 (AVHRR-3)
Swath Width: 2400.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

NOAA-7
Platform
Name: National Oceanic & Atmospheric Administration-7 (NOAA-7)
Orbit Period: 102.0 minutes
Inclination Angle: 99.0 degrees
/
AVHRR-2
SENSOR
Name: Advanced Very High Resolution Radiometer-2 (AVHRR-2)
Swath Width: 2400.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

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ProjectGroup for High Resolution Sea Surface Temperature (GHRSST)
Data ProviderPublisher: PO.DAAC
Creator: NOAA National Centers for Environmental Information
Release Place: National Centers for Environmental Information, Asheville, NC, USA
Release Date: 2020-Apr-22

FormatnetCDF-4
Keyword(s)GHRSST, sea surface temperature, SST, AVHRR, NCEI, OISST, NOAA
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution
Spatial Resolution: 0.25 degrees (Latitude) x 0.25 degrees (Longitude)
Temporal Resolution: Daily - < Weekly
 
Coverage
Region: GLOBAL
North Bounding Coordinate: 90 degrees
South Bounding Coordinate: -90 degrees
West Bounding Coordinate: -180 degrees
East Bounding Coordinate: 180 degrees
Time Span: 2016-Jan-01 to Present
Granule Time Span: 2016-Jan-01 to 2022-Sep-25
 
Projection
Projection Type: Cylindrical Lat-Lon
Projection Detail: Geolocation information included for each pixel
Ellipsoid: WGS 84
 
GENERAL DOCUMENTATION
USER'S GUIDE
PUBLICATIONS
  • https://doi.org/10.5194/essd-8-165-2016
    A long-term record of blended satellite and in situ sea-surface temperature for climate monitoring, modeling and environmental studies, Earth Syst. Sci. Data, 8, 165-176, 2016
DATA RECIPE
DATA CITATION POLICY
Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
Citation NOAA National Centers for Environmental Information. 2020. Daily L4 Optimally Interpolated SST (OISST) In situ and AVHRR Analysis. Ver. 2.1. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/GHAAO-4BC21

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For more information see Data Citations and Acknowledgments.

Journal Reference Reynolds, R. W., T. M. Smith, C. Liu, D. B. Chelton, K. S. Casey and M. G. Schlax. 2007. Daily High-resolution Blended Analyses for sea surface temperature, Journal of Climate, 20, 22. https://doi.org/10.1175/2007JCLI1824.1