GHRSST Level 4 AVHRR_OI Global Blended Sea Surface Temperature Analysis (GDS2) from NCEI
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DOI10.5067/GHAAO-4BC21
Short NameAVHRR_OI-NCEI-L4-GLOB-v2.1
DescriptionA Group for High Resolution Sea Surface Temperature (GHRSST) global Level 4 sea surface temperature analysis 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 file is produced in near-real time (1-day latency), and then replaced with a final version after 2 weeks. The v2.1 is updated from the 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 increase 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 (Banzon et al. 2020). These updates only apply to granules after Jan. 1st, 2016. The data pre 2016 are still the same as v2.0 except for metadata upgrades.
Version2.1
Dataset TypeOPEN
MeasurementOCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE > FOUNDATION SEA SURFACE TEMPERATURE
Processing Level4
CoverageRegion: Global
Northernmost Latitude: 90 degrees
Southernmost Latitude: -90 degrees
Westernmost Longitude: -180 degrees
Easternmost Longitude: 180 degrees
Time Span: 1981-Sep-01 to Present
Granule Time Span: 2016-Jan-01 to 2020-May-28
ResolutionSpatial Resolution: 0.25 degrees (Latitude) x 0.25 degrees (Longitude)
Temporal Resolution: 1 Day
ProjectionType: Cylindrical Lat-Lon
Detail: Regular 0.25 degree grid
Ellipsoid: WGS 84
Latency24 hours
Platform/Sensor
InSitu
Platform
Name: InSitu (InSitu)
Orbit Period: -999 minutes
Inclination Angle: -999 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
InSitu
SENSOR
Name: Ships and Moored and Drifting Buoys (InSitu)
Swath Width: -999 km
Description: In situ SST data from drifting and moored buoys, and ships.

METOP-A
Platform
Name: Meteorological Operational Satellite - A (METOP-A)
Orbit Period: 101.3 minutes
Inclination Angle: 98.7 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
AVHRR-3
SENSOR
Name: Advanced Very High Resolution Radiometer-3 (AVHRR-3)
Swath Width: 2400 km
Description: The AVHRR is a radiation-detection imager that can be used for remotely determining cloud cover and the surface temperature. Note that the term surface can mean the surface of the Earth, the upper surfaces of clouds, or the surface of a body of water.

NOAA-16
Platform
Name: National Oceanic & Atmospheric Administration-16 (NOAA-16)
Orbit Period: 102.1 minutes
Inclination Angle: 99 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
AVHRR-3
SENSOR
Name: Advanced Very High Resolution Radiometer-3 (AVHRR-3)
Swath Width: 2400 km
Description: The AVHRR is a radiation-detection imager that can be used for remotely determining cloud cover and the surface temperature. Note that the term surface can mean the surface of the Earth, the upper surfaces of clouds, or the surface of a body of water.

NOAA-17
Platform
Name: National Oceanic & Atmospheric Administration-17 (NOAA-17)
Orbit Period: 101.2 minutes
Inclination Angle: 98.7 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
AVHRR-3
SENSOR
Name: Advanced Very High Resolution Radiometer-3 (AVHRR-3)
Swath Width: 2400 km
Description: The AVHRR is a radiation-detection imager that can be used for remotely determining cloud cover and the surface temperature. Note that the term surface can mean the surface of the Earth, the upper surfaces of clouds, or the surface of a body of water.

NOAA-19
Platform
Name: National Oceanic & Atmospheric Administration-19 (NOAA-19)
Orbit Period: 102.12 minutes
Inclination Angle: 98.74 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
AVHRR-3
SENSOR
Name: Advanced Very High Resolution Radiometer-3 (AVHRR-3)
Swath Width: 2400 km
Description: The AVHRR is a radiation-detection imager that can be used for remotely determining cloud cover and the surface temperature. Note that the term surface can mean the surface of the Earth, the upper surfaces of clouds, or the surface of a body of water.

NOAA-11
Platform
Name: National Oceanic & Atmospheric Administration-11 (NOAA-11)
Orbit Period: 102 minutes
Inclination Angle: 99 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
AVHRR-2
SENSOR
Name: Advanced Very High Resolution Radiometer-2 (AVHRR-2)
Swath Width: 2400 km
Description: The AVHRR is a radiation-detection imager that can be used for remotely determining cloud cover and the surface temperature of water land and clouds.

NOAA-7
Platform
Name: National Oceanic & Atmospheric Administration-7 (NOAA-7)
Orbit Period: 102 minutes
Inclination Angle: 99 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
AVHRR-2
SENSOR
Name: Advanced Very High Resolution Radiometer-2 (AVHRR-2)
Swath Width: 2400 km
Description: The AVHRR is a radiation-detection imager that can be used for remotely determining cloud cover and the surface temperature of water land and clouds.

NOAA-9
Platform
Name: National Oceanic & Atmospheric Administration-9 (NOAA-9)
Orbit Period: 102 minutes
Inclination Angle: 98 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
AVHRR-2
SENSOR
Name: Advanced Very High Resolution Radiometer-2 (AVHRR-2)
Swath Width: 2400 km
Description: The AVHRR is a radiation-detection imager that can be used for remotely determining cloud cover and the surface temperature of water land and clouds.

NOAA-14
Platform
Name: National Oceanic & Atmospheric Administration-14 (NOAA-14)
Orbit Period: 102 minutes
Inclination Angle: 99 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
AVHRR-2
SENSOR
Name: Advanced Very High Resolution Radiometer-2 (AVHRR-2)
Swath Width: 2400 km
Description: The AVHRR is a radiation-detection imager that can be used for remotely determining cloud cover and the surface temperature of water land and clouds.

METOP-B
Platform
Name: Meteorological Operational Satellite - B (METOP-B)
Orbit Period: 101.3 minutes
Inclination Angle: 98.7 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
AVHRR-3
SENSOR
Name: Advanced Very High Resolution Radiometer-3 (AVHRR-3)
Swath Width: 2400 km
Description: The AVHRR is a radiation-detection imager that can be used for remotely determining cloud cover and the surface temperature. Note that the term surface can mean the surface of the Earth, the upper surfaces of clouds, or the surface of a body of water.

ProjectGroup for High Resolution Sea Surface Temperature (GHRSST)
Data ProviderCreator: National Centers for Environmental Information
Release Place: National Centers for Environmental Information, Asheville, NC, USA
Release Date: 2020-Apr-22
Resource: none
Keyword(s)GHRSST, sea surface temperature, SST, AVHRR, NCEI, OISST, NOAA
Persistent IDPODAAC-GHAAO-4BC21
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
User's Guide
GDS2 User Manualhttps://podaac-tools.jpl.nasa.gov/drive/files/OceanTemperature/ghrsst/docs/GDS20r5.pdf
Documentation on the GDS version 2 format specification
Project Materials
ATBDhttps://podaac-tools.jpl.nasa.gov/drive/files/allData/ghrsst/docs/NCEI_AVHRR-OI_SST_ATBD.pdf
Daily 1/4 Degree Optimum Interpolation Sea Surface Temperature (OISST)- Climate Algorithm Theoretical Theoretical Basis Document, NOAA Climate Data Record Program CDRP-ATBD-0303 Rev. 2 (2013)
Journal References
Earth System Science Datahttp://www.earth-syst-sci-data.net/8/165/2016/
Viva Banzon, Thomas M. Smith, Toshio Mike Chin, Chunying Liu, and William Hankins, 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
Citation National Centers for Environmental Information. 2020. GHRSST Level 4 AVHRR_OI Global Blended Sea Surface Temperature Analysis (GDS2) from NCEI. 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. J. Climate, 20, 5473-5496