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Description

This product contains a “Final” (Refined) Level-3U Sea Surface Temperature (SST) (currently identified by "v8.2" within the file name) for the Group for High Resolution Sea Surface Temperature (GHRSST) Project, which is derived from the Advanced Microwave Scanning Radiometer 2 (AMSR2) by Remote Sensing Systems (RSS, or REMSS). AMSR2 was launched on 18 May 2012, onboard the Global Change Observation Mission - Water (GCOM-W) satellite developed by the Japan Aerospace Exploration Agency (JAXA). The GCOM-W mission aims to establish the global and long-term observation system to collect data, which is needed to understand mechanisms of climate and water cycle variations, and demonstrate its utilization. AMSR2 onboard the first generation of the GCOM-W satellite will continue Aqua/AMSR-E observations of water vapor, cloud liquid water, precipitation, SST, sea surface wind speed, sea ice concentration, snow depth, and soil moisture. AMSR2 is a remote sensing instrument for measuring weak microwave emission from the surface and the atmosphere of the Earth. The antenna of AMSR2 rotates once per 1.5 seconds and obtains data over a 1450 km swath. This conical scan mechanism enables AMSR2 to acquire a set of daytime and nighttime data with more than 99% coverage of the Earth every 2 days. The “Final” SSTs are processed when RSS receives the atmospheric model National Center for Environmental Prediction (NCEP) Final Analysis (FNL) Operational Global Analysis. The NCEP wind directions are particularly useful for retrieving more accurate SSTs and wind speeds. The final "v8.2" products will continue to accumulate new swaths (half orbits) until the maps are full, generally within 2 days. The v8.2 L3U SST supersedes the previous v8a dataset which can be found at https://www.doi.org/10.5067/GHAM2-3UR8A.

Product Summary

Platforms
GCOM-W1
Instruments
AMSR2
Spatial Extent

N: 90 S: -90 E: 180 W: -179

Spatial Resolution
0.25 Decimal Degrees x 0.25 Decimal Degrees
Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2012-07-02
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC) ,
Remote Sensing Systems (RSS)
Concept ID
C2600786104-POCLOUD
Data State
ACTIVE
Number of Files/Granules
4902
Processing Level
3
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. (2023). GHRSST Level 3U Global Subskin Sea Surface Temperature version 8.2 (v8.2) from the Advanced Microwave Scanning Radiometer 2 (AMSR2) on the GCOM-W satellite by REMSS [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/GHAM2-3UR82 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
cloud_liquid_water non L3U core field kg m-2 byte -128 -127 to 127 0.01
confidence_flag b0:1=within 50km rain, 0.6 dif mwoisst;b1:1=within 100km rain, 0.8 dif mwoisst;b2:1=within 150km ice, 0.6 dif mwoisst;b3:1=more than 5deg dif mwoisst;b4:1=3-sigma test;b5:1=(tmi only) within 150 km of land and 0.6 warmer than mwoisst;b6:1=diurnal estimate > 0.3 warming;b7:1=diurnal estimate > 1.0 warming N/A byte N/A N/A 1
cool_skin non L3U core field K byte -128 -127 to 127 0.01
diurnal_amplitude non L3U core field K byte -128 -127 to 127 0.02
dt_analysis delta SST K byte -128 -127 to 127 0.1
l2p_flags These flags can help use the data N/A short N/A 0 to 2047 1
lat Latitude of retrievals degrees_north float N/A -89.875 to 89.875 1
lon Longitude of retrievals degrees_east float N/A -179.875 to 179.875 1
proximity_confidence 1=Bad, data rejected;2=Suspected Bad, data that has any confidence flags bit 0-5 thrown;3=Unprocessed proximity confidence flag, should be Good data;4=Good data N/A byte N/A N/A 1
quality_level This flag can help use the data N/A byte -128 0 to 5 1
rain_rate non L3U core field mm hr-1 byte -128 -127 to 127 0.1
rejection_flag b0:1=rain;b1:1=high wind/sunglint;b2:1=ice;b3:1=near land;b4:1=no data;b5:1=land; N/A byte N/A N/A 1
sea_ice_fraction ftp://eclipse.ncdc.noaa.gov/pub/OI-daily-v2/IEEE/YYYY/AVHRR/avhrr-only-v2.YYYYMMDD.gz 1 byte -128 -127 to 127 0.01
sea_surface_temperature Microwave SST = approximately the top 1 milimeter K short -32768 -5000 to 5000 0.01
sses_bias Sensor Specific Bias from in situ SSTs K byte -128 -127 to 127 0.01
sses_standard_deviation Sensor Specific STD from in situ SSTs K byte -128 -127 to 127 0.01
sst_dtime relative time of SST observations seconds since 2023-01-10 00:00:00 int -32768 0 to 10000 10
time useful to help interpret sst_dtime seconds since 1981-01-01 00:00:00 int N/A N/A 1
water_vapor non L3U core field kg m-2 byte -128 -127 to 127 0.3
wind_speed non L3U core field; wind_speed_lf m s-1 byte -128 -127 to 127 0.2
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