RSS SMAP Level 3 Sea Surface Salinity Standard Mapped Image 8-Day Running Mean V3.0 70km Validated Dataset

RSS SMAP Level 3 Sea Surface Salinity Standard Mapped Image 8-Day Running Mean V3.0 70km Validated Dataset
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DescriptionThe version 3.0 70km SMAP-SSS level 3, 8-Day running mean gridded product is the third release of the validated standard mapped sea surface salinity (SSS) data from the NASA Soil Moisture Active Passive (SMAP) observatory produced operationally by Remote Sensing Systems (RSS). Enhancements with this release include: Use of the version 4 L1B SMAP RFI filtered antenna temperatures; Implementation of the geophysical model function from Aquarius version 5 adapted to SMAP; Use of the near real time CCMP wind speed and direction data as ancillary input, and inclusion of IMERG rain rate for the atmospheric liquid cloud water correction and rain flagging; Improved computation of antenna weighted land fraction gland and enhanced correction for land radiation intrusion from antenna sidelobes; Improved SMAP mesh antenna emissivity settings with empirical adjustments to the JPL thermal model. Users should note that significant degradation in the performance is observed if the gain weighted land fraction gland exceeds 1 percent. Because of that, observations with gland greater than 0.8 percent are not used in the Level 3 processing. Daily data files for this product are based on SSS averages spanning an 8-day moving time window. SMAP data begins on April 1,2015 and is ongoing, with a one-month latency in processing and availability. L3 products are global in extent and gridded at 0.25degree x 0.25degree with an approximate spatial feature resolution of 70km. For most open ocean applications, the 70-km products are the best to use as they have significantly lower noise than the related 40-km V3.0 products. The SMAP satellite is in a near-polar orbit at an inclination of 98 degrees and an altitude of 685 km. It has an ascending node time of 6 pm and is sun-synchronous. With its 1000km swath, SMAP achieves global coverage in approximately 3 days, but has an exact orbit repeat cycle of 8 days. On board instruments include a highly sensitive L-band radiometer operating at 1.41GHz and an L-band 1.26GHz radar sensor providing complementary active and passive sensing capabilities. Malfunction of the SMAP scatterometer on 7 July, 2015, has necessitated the use of collocated wind speed, primarily from WindSat, for the surface roughness correction required for the surface salinity retrieval.
Dataset TypeOPEN
MeasurementOceans > Salinity/Density > Salinity > None
Processing Level3
CoverageRegion: Global
Northernmost Latitude: 90 degrees
Southernmost Latitude: -90 degrees
Westernmost Longitude: -180 degrees
Easternmost Longitude: 180 degrees
Time Span: 2015-Mar-27 to Present
ResolutionSpatial Resolution: 0.25 degrees (Latitude) x 0.25 degrees (Longitude)
Temporal Resolution: 8 Day
ProjectionType: Gridded
Ellipsoid: WGS 84
Latency720 hours
Name: NASA Soil Moisture Active Passive (SMAP) (SMAP)
Orbit Period: 98.5 minutes
Inclination Angle: 98 degrees
Ascending Node: 1970-Jan-01 00:00:00
Swath Width: 1000 km
Description: L-Band 1.41 GHz Radiometer aboard the NASA SMAP (Soil Moisture Active Passive) satellite observatory

ProjectSoil Moisture Active Passive (SMAP) Sea Surface Salinity (SSS) (SMAP-SSS)
Data ProviderCreator: Remote Sensing Systems (RSS)
Release Place: Remote Sensing Systems, 444 Tenth Street, Suite 200, Santa Rosa, CA 95401, USA
Release Date: 2018-Oct-31
Keyword(s)RssSmapSSSv3, 70km, V3.0, L3, Level 3, 8 day running mean, SMAP, SMAP-SSS, Soil Moisture Active, Passive, salinity, polar, sun-synchronous, sss, sea surface, salinity, psu, NASA, project, mission, RSS, REMSS, Remote Sensing Systems
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User's Guide
User's Guide
SMAP-SSS V3.0 Technical Guide (ATBD, Validation Analysis, Product Format Specification)
Project Materials
SMAP-SSS v3.0 Documentation Package
ATBD, Validation Analysis, Product Specifications, etc
Additional Sites
SMAP Mission Website
NASA SMAP Mission Website
SMAP-SSS on RSS Website
Remote Sensing Systems SMAP Sea Surface Salinity Website
PO.DAAC SMAP-SSS Mission page
SMAP-SSS Project and Instrument Overview
Citation Remote Sensing Systems (RSS). 2018. RSS SMAP Level 3 Sea Surface Salinity Standard Mapped Image 8-Day Running Mean V3.0 70km Validated Dataset. Ver. 3.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at

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For more information see Data Citations and Acknowledgments.

Journal Reference Meissner, T. and F. J. Wentz, 2018: Remote Sensing Sytems SMAP Ocean Surface Salinities, Version 3.0 validated release. Remote Sensing Systems, Santa Rosa, CA, USA.