JPL SMAP Level 3 CAP Sea Surface Salinity Standard Mapped Image 8-Day Running Mean V4.3 Validated Dataset
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DOI10.5067/SMP43-3TPCS
Short NameSMAP_JPL_L3_SSS_CAP_8DAY-RUNNINGMEAN_V43
DescriptionThis is the PI-produced JPL SMAP-SSS V4.3 CAP, 8-day running mean, level 3 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. Daily data files for this L3 product are based on SSS averages spanning an 8-day moving time window. Associated file variables include: derived SSS with associated uncertainties and wind speed data from SMAP, ancillary ice concentration and HYCOM surface salinity data. SMAP data begins on April 1, 2015 and is ongoing, with a 7-day 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, 2015, has necessitated the use of collocated wind speed for the surface roughness correction required for the surface salinity retrieval.
Version4.3
Dataset TypeOPEN
MeasurementOCEANS > OCEAN WINDS > SURFACE WINDS
OCEANS > 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-31 to Present
Granule Time Span: 2015-Mar-31 to 2020-Jul-10
ResolutionSpatial Resolution: 0.6 degrees (Latitude) x 0.6 degrees (Longitude)
Temporal Resolution: 8 Day
ProjectionType: Gridded
Detail:
Ellipsoid: WGS 84
Latency72 hours
Platform/Sensor
SMAP
Platform
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
/
SMAP L-BAND RADIOMETER
SENSOR
Name: SMAP L-Band Radiometer (SMAP L-BAND RADIOMETER)
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: JPL
Release Place: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA91109, USA
Release Date: 2020-Feb-13
Resource: http://podaac.jpl.nasa.gov/smap
Keyword(s)JPLSMAPSSSV43, 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, JPL, CAP, combined active/passive
Persistent IDPODAAC-SMP43-3TPCS
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
User's Guide
User Guidehttps://podaac-tools.jpl.nasa.gov/drive/files/allData/smap/docs/JPL-CAP_V43/SMAP-SSS_JPL_V4.3_Documentation.pdf
User guidance documentation for this dataset
Project Materials
JPL CAP SMAP-SSS v4.3 Documentation Packagehttps://podaac-tools.jpl.nasa.gov/drive/files/allData/smap/docs/JPL-CAP_V43/
ATBD, Validation Analysis, Product Specifications, etc
Additional Sites
PO.DAAC SMAP-SSS Mission pagehttp://podaac.jpl.nasa.gov/smap
SMAP-SSS Project and Instrument Overview
SMAP Mission Websitehttp://smap.jpl.nasa.gov/
NASA SMAP Mission Website
Known Issues
Known Issueshttps://podaac-tools.jpl.nasa.gov/drive/files/allData/smap/README.KnownIssues.txt
Information on Data Outages & Known Issues
Citation JPL. 2020. JPL SMAP Level 3 CAP Sea Surface Salinity Standard Mapped Image 8-Day Running Mean V4.3 Validated Dataset. Ver. 4.3. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/SMP43-3TPCS.

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For more information see Data Citations and Acknowledgments.

Journal Reference Fore,A.G, S.H. Yueh, W. Tang, B.W. Stiles, and A.K. Hayashi (2016). Combined Active/Passive Retrievals of Ocean Vector Wind and Sea Surface Salinity With SMAP. IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, VOL. 54, NO. 12. p.7396-7404. DOI: 10.1109/TGRS.2016.2601486