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Description

A Group for High Resolution Sea Surface Temperature (GHRSST) Level 4 sea surface temperature analysis, produced daily on an operational basis at the Australian Bureau of Meteorology (BoM) using optimal interpolation (OI) on a global 0.25 degree grid. This Global Australian Multi-Sensor SST Analysis (GAMSSA) v1.0 system blends satellite SST observations from passive infrared and passive microwave radiometers with in situ data from ships, drifting buoys and moorings from the Global Telecommunications System (GTS). SST observations that have experienced recent surface wind speeds less than 6 m/s during the day or less than 2 m/s during night are rejected from the analysis. The processing results in daily foundation SST estimates that are largely free of nocturnal cooling and diurnal warming effects. Sea ice concentrations are supplied by the NOAA/NCEP 12.7 km sea ice analysis. In the absence of observations, the analysis relaxes to the Reynolds and Smith (1994) Monthly 1 degree SST climatology for 1961 - 1990.

Product Summary

Platforms
BUOYS ,
Suomi-NPP ,
GCOM-W1 ,
METOP-A ,
NOAA-20 ,
METOP-B
Instruments
DRIFTING BUOYS ,
VIIRS ,
AMSR2 ,
AVHRR-3
Spatial Extent

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

Spatial Resolution
0.25 Decimal Degrees x 0.25 Decimal Degrees
Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2008-07-23
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC) ,
Bureau of Meteorology, Australia (AU/BOM)
Concept ID
C2036881735-POCLOUD
Data State
ACTIVE
Number of Files/Granules
6343
Processing Level
4
Published
Updated
Science Keywords
Sea Surface Foundation 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

Australian Bureau Of Meteorology (ABOM). (2019). GHRSST Level 4 GAMSSA_28km Global Foundation Sea Surface Temperature Analysis v1.0 dataset (GDS2) [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/GHGAM-4FA1A Date Accessed: 2025-12-14

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
analysed_sst Optimally interpolated analysis of SST observations. kelvin short -32768 -300 to 4500 0.01
analysis_error Calculated as analysis field error in OI analysis system and a function of the age and estimated standard deviation of all observations used to form analysed_sst value. See Beggs et al (2011) in http://www.bom.gov.au/jshess/papers.php?year=2011. kelvin short -32768 0 to 32765 0.01
crs coordinate reference system N/A int N/A N/A 1
lat Latitudes for locating data degrees_north float 9.96921E+36 -90 to 90 1
lon Longitudes for locating data degrees_east float 9.96921E+36 -180 to 180 1
mask b0: 1 = grid cell is open sea water, b1: 1 = land is present in this grid cell, b2: 1 = lake surface is present in this grid cell, b3: 1 = sea ice is present in this grid cell, b4-b7: reserved for future grid mask data N/A byte -128 1 to 8 1
sea_ice_fraction Fractional sea ice cover from NCEP-ICE product (Grumbine, 1996) . 1 byte -128 0 to 100 0.01
time Nominal time because observations are from different sources and are made at different times of the day seconds since 1981-01-01 00:00:00 int -2147483647 N/A 1
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