JPL SMAP Level 3 CAP Sea Surface Salinity Standard Mapped Image Monthly V4.3 Validated Dataset
DOI10.5067/SMP43-3TMCS
Short NameSMAP_JPL_L3_SSS_CAP_MONTHLY_V43
DescriptionThis is the PI-produced JPL SMAP-SSS V4.3 CAP, level 3, monthly mapped sea surface salinity (SSS) product from the NASA Soil Moisture Active Passive (SMAP) observatory. It is based on the Combined Active-Passive (CAP) retrieval algorithm developed at JPL originally in the context of Aquarius/SAC-D and now extended to SMAP. Improvements with V4.3 include: 1) New residual TB calibration which removes the ascending/descending bias issue observed for version 4.2; 2) Slightly modified criteria for aggregation from L2B to L3 based on TB for V-pol minus TB for H-pol. L3 monthly product file variables include: derived SSS with associated uncertainties and wind speed from SMAP and ancillary surface salinity from HYCOM. SMAP data begins on April 1, 2015 and is ongoing, with a 1 month latency in processing and availability. L3 products are global in extent and gridded at 0.25degree x 0.25degree with an approximate spatial resolution of 60km. 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 for the surface roughness correction required for the surface salinity retrieval.
Version4.3
Dataset TypeACTIVE
MeasurementSALINITY > SALINITY/DENSITY > OCEANS
SURFACE WINDS > OCEAN WINDS > OCEANS
Processing Level3
CoverageNorth Bounding Coordinate: 90 degrees
South Bounding Coordinate: -90 degrees
West Bounding Coordinate: -180 degrees
East Bounding Coordinate: 180 degrees
Time Span: 2015-Apr-01 to Present
Granule Time Span: 2015-Apr-01 to 2020-Aug-01
ResolutionSpatial Resolution: 0.6 degrees (Latitude) x 0.6 degrees (Longitude)
Temporal Resolution: 1 Month
ProjectionEllipsoid: WGS 84
Platform/Sensor
SMAP
Platform
Name: NASA Soil Moisture Active Passive (SMAP) (SMAP)
Orbit Period: 98.5 minutes
Inclination Angle: 98.0 degrees
/
SMAP L-BAND RADIOMETER
SENSOR
Name: SMAP L-Band Radiometer (SMAP L-BAND RADIOMETER)
Swath Width: 1000.0 meters
Description: Spacecraft angular distance from orbital plane relative to the Equator.

ProjectSoil Moisture Active Passive (SMAP) Sea Surface Salinity (SSS) (SMAP-SSS)
Data ProviderPublisher: JPL
Creator: JPL
Release Place: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA91109, USA
Release Date: 2020-Feb-13
Keyword(s)JPLSMAPSSSV43, L3, Level 3, monthly, SMAP, SMAP-SSS, Soil Moisture Active, Passive, salinity, polar, sun-synchronous, sss, sea surface, salinity, psu, NASA, project, mission, JPL, CAP, combined active/passive
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
USER'S GUIDE
GENERAL DOCUMENTATION
Citation JPL. 2020. JPL CAP SMAP Sea Surface Salinity Products. Ver. 4.3. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/SMP43-3TMCS

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