Skip to main content

Description

This is a level 4 product on a 0.25-degree spatial and monthly temporal grid. The product is the monthly mean of the level 4 OISSS dataset using three satellite missions: the Aquarius/SAC-D, Soil Moisture Active Passive (SMAP) and Soil Moisture and Ocean Salinity (SMOS) using Optimal Interpolation (OI) with a 7-day decorrelation time scale. This dataset is produced by the Earth and Space Research (ESR), Seattle, WA and the International Pacific Research Center (IPRC) of the University of Hawaii at Manoa in collaboration with the Remote Sensing Systems (RSS), Santa Rosa, California. More details can be found in the users guide.

Product Summary

Platforms
SMAP ,
SAC-D ,
SMOS
Instruments
SMAP L-BAND RADIOMETER ,
AQUARIUS_SCATTEROMETER
Spatial Extent

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

Spatial Resolution
0.25 Decimal Degrees x 0.25 Decimal Degrees
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2011-08-01
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC) ,
International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii (UHI/SOEST/IPRC)
Concept ID
C2589165108-POCLOUD
Data State
COMPLETE
Number of Files/Granules
160
Processing Level
4
Published
Updated
Science Keywords
Salinity ,
Ocean Surface Salinity

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

IPRC/SOEST, U. of H. (2023). Multi-Mission Optimally Interpolated Sea Surface Salinity Monthly Global Dataset V2 [Data set]. NASA Physical Oceanography Distributed Active Archive Center. https://doi.org/10.5067/SMP20-4UMCS 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
latitude latitude degrees_north float N/A -90 to 90 1
longitude longitude degrees_east float N/A -180 to 180 1
sss multi-mission OISSS monthly average 1e-3 float -9999 0 to 45 1
sss_anomaly sea surface salinity anomaly relative to the product-based monthly climatology 1e-3 float -9999 -10 to 10 1
sss_climatology monthly climatological sea surface salinity based on multi-mission OISSS dataset from 09/2011 to 08/2021 1e-3 float -9999 0 to 45 1
sss_empirical_uncertainty estimated empirical uncertainty of multi-mission OISSS monthly average 1e-3 float -9999 0 to 45 1
sss_formal_uncertainty estimated formal uncertainty of multi-mission OISSS monthly average 1e-3 float -9999 0 to 45 1
time reference time of analyzed variable field corresponding to the center of the product time interval Days since 2010-12-31T00:00:00Z float N/A N/A 1
You're viewing 8 of 8