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Description

The Operational Sea Surface Temperature and Sea Ice Analysis Reprocessed (OSTIA-REP) is a GHRSST reprocessed Level-4 sea surface temperature and ice-concentration analysis produced by the UK Met Office (UKMO) using optimal interpolation (OI) on a global 0.05 degree grid. It is a sister product of the Near Real Time version (OSTIA-NRT), but incorporates satellite data from over 25 different SST sensors as well as in situ data from drifting and moored buoys. The OSTIA-REP is produced on a biannual frequency when more satellite and climatology observations are available from existing geostationary IR, and polar orbiting IR and MW satellites in addition to the data used in OSTIA-NRT. <br><br>
While OSTIA-NRT is produced to mainly serve as a lower boundary condition in Numerical Weather Prediction (NWP) models, this OSTIA-REP aims to provide a more accurate and consistent record of SST measurements over time, which is crucial for detecting long-term climate trends and variability. Both versions follow GHRSST Data Processing Specification (GDS) version 2 format guidelines.<br><br>
Data to June 2022 are also distributed through the E.U. Copernicus Marine Service Information (https://marine.copernicus.eu/, DOI: https://doi.org/10.48670/moi-00168 with the following license). Please refer to the user guide for more information.

Product Summary

Platforms
GOES-16 ,
METEOSAT-9 ,
BUOYS ,
METOP-A ,
SENTINEL-3A ,
GCOM-W1 ,
ENVISAT ,
GOES-13 ,
METOP-B ,
NOAA-19 ,
GPM ,
TRMM ,
NOAA-18 ,
NOAA-17 ,
NOAA-16 ,
NOAA-15 ,
NOAA-14 ,
NOAA-12 ,
NOAA-11 ,
NOAA-10 ,
NOAA-9 ,
NOAA-8 ,
NOAA-7 ,
NOAA-6 ,
SENTINEL-3B
Instruments
ABI ,
SEVIRI ,
DRIFTING BUOYS ,
AVHRR ,
SLSTR ,
AMSR2 ,
AATSR ,
GMI ,
TMI
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Spatial Resolution
0.05 Decimal Degrees x 0.05 Decimal Degrees
Location
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
1982-01-01 to 2024-01-01
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC) ,
Met Office, Ministry of Defence, United Kingdom (UK/MOD/MET)
Concept ID
C2586786218-POCLOUD
Data State
ACTIVE
Number of Files/Granules
15340
Processing Level
4
Published
Updated
Science Keywords
Sea Ice Concentration ,
Sea Surface Temperature

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

NASA/JPL. (2023). GHRSST Level 4 OSTIA Global Historical Reprocessed Foundation Sea Surface Temperature Analysis produced by the UK Meteorological Office [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/GHOST-4RM02 Date Accessed: 2026-04-16

Documents

Variables

The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.

For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor Offset
analysed_sst OSTIA foundation SST kelvin short -32768 -300 to 4500 0.01 273.15
analysis_error OSTIA foundation SST analysis standard deviation error kelvin short -32768 0 to 32767 0.01 N/A
lat Latitude geographical coordinates,WGS84 projection degrees_north float N/A -90 to 90 1 N/A
lon Longitude geographical coordinates,WGS84 projection degrees_east float N/A -180 to 180 1 N/A
mask Land/ open ocean/ sea ice /lake mask N/A byte -128 1 to 31 1 N/A
sea_ice_fraction Sea ice area fraction 1 byte -128 0 to 100 0.01 N/A
time seconds since 1981-01-01 00:00:00 seconds since 1981-01-01 00:00:00 int N/A N/A N/A N/A
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