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Description

A Group for High Resolution Sea Surface Temperature (GHRSST) Level 4 sea surface temperature analysis produced as a retrospective dataset at the JPL Physical Oceanography DAAC using wavelets as basis functions in an optimal interpolation approach on a global 0.25 degree grid. The version 4 Multiscale Ultrahigh Resolution (MUR) L4 analysis is based upon nighttime GHRSST L2P skin and subskin SST observations from several instruments including the NASA Advanced Microwave Scanning Radiometer-EOS (AMSR-E), the JAXA Advanced Microwave Scanning Radiometer 2 on GCOM-W1, the Moderate Resolution Imaging Spectroradiometers (MODIS) on the NASA Aqua and Terra platforms, the US Navy microwave WindSat radiometer, the Advanced Very High Resolution Radiometer (AVHRR) on several NOAA satellites, and in situ SST observations from the NOAA iQuam project. The ice concentration data are from the archives at the EUMETSAT Ocean and Sea Ice Satellite Application Facility (OSI SAF) High Latitude Processing Center and are also used for an improved SST parameterization for the high-latitudes. The dataset also contains an additional SST anomaly variable derived from a MUR climatology (average between 2003 and 2014). This dataset was originally funded by the NASA MEaSUREs program (http://earthdata.nasa.gov/our-community/community-data-system-programs/measures-projects ) and the NASA CEOS COVERAGE project and created by a team led by Dr. Toshio M. Chin from JPL. It adheres to the GHRSST Data Processing Specification (GDS) version 2 format specifications.

Product Summary

Platforms
Aqua ,
CORIOLIS ,
Terra ,
NOAA-19 ,
BUOYS ,
GCOM-W1
Instruments
MODIS ,
AMSR-E ,
WINDSAT ,
AVHRR-3 ,
DRIFTING BUOYS ,
AMSR2
Spatial Extent

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

Spatial Resolution
0.25 Decimal Degrees x 0.25 Decimal Degrees
Location
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2002-08-31
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC) ,
Jet Propulsion Laboratory, NASA (NASA/JPL)
Concept ID
C2036880657-POCLOUD
Data State
ACTIVE
Number of Files/Granules
8624
Processing Level
4
Published
Updated
Science Keywords
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. (2019). GHRSST Level 4 MUR 0.25deg Global Foundation Sea Surface Temperature Analysis (v4.2) [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/GHM25-4FJ42 Date Accessed: 2026-04-13

Documents

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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 "Final" version using Multi-Resolution Variational Analysis (MRVA) method for interpolation kelvin short -32768 -32767 to 32767 0.001 298.15
analysis_error uncertainty in "analysed_sst" kelvin short -32768 0 to 32767 0.01 N/A
lat geolocations inherited from the input data without correction degrees_north float N/A -90 to 90 1 N/A
lon geolocations inherited from the input data without correction degrees_east float N/A -180 to 180 1 N/A
mask flag interpretation as integer values: 1=water, 2=land, 5=lake, 9=water with ice in the grid, 13=lake with ice in the grid, 17=river N/A byte -128 1 to 31 1 N/A
sea_ice_fraction ice fraction is a dimensionless quantity between 0 and 1; it has been interpolated by a nearest neighbor approach. N/A byte -128 0 to 100 0.01 N/A
sst_anomaly anomaly reference to the day-of-year average between 2003 and 2014 kelvin short -32768 -32767 to 32767 0.001 N/A
time Nominal time of analyzed fields seconds since 1981-01-01 00:00:00 UTC int N/A N/A 1 N/A
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