JPL SMAP Level 3 CAP Sea Surface Salinity Standard Mapped Image Monthly V5.0 Validated Dataset
(SMAP_JPL_L3_SSS_CAP_MONTHLY_V5)
3 Publications Cited this Dataset
Citation metrics available for years (2014-2022)
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Publications citing JPL SMAP Level 3 CAP Sea Surface Salinity Standard Mapped Image Monthly V5.0 Validated Dataset
Citation metrics available for years (2014-2022)
| Year | Citation |
|---|---|
| 2021 | Surface freshwater fluxes in the Arctic and Subarctic Seas during contrasting years of high and low summer sea ice extent, Journal ,10.3390/rs13081570 |
| 2021 | Fore, A., Yueh, S., Tanh, W., & Hayashi, A. (2020).JPL SMAP ocean surface salinity products [level 2B, level 3 running 8-day, level 3 monthly], version 5.0 validated release. Pasadena: Jet Propulsion Laboratory The cause of an extremely low salinity anomaly in the Bay of Bengal during 2012 spring, Journal ,10.1029/2021JC017361 |
| 2022 | Using Saildrones to Assess the SMAP Sea Surface Salinity Retrieval in the Coastal Regions, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing ,10.1109/JSTARS.2022.3200305 |
| Version | 5.0 |
| Processing Level | 3 |
| Start/Stop Date | 2015-Apr-01 to Present |
| Short Name | SMAP_JPL_L3_SSS_CAP_MONTHLY_V5 |
| Description | This is the PI-produced JPL SMAP-SSS V5.0 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. JPL SMAP V5.0 SSS is based on the newly released SMAP V5 Level-1 Brightness Temperatures (TB). An enhanced calibration methodology has been applied to the brightness temperatures, which improves absolute radiometric calibration and reduces the biases between ascending and descending passes. The improved SMAP TB Level 1 TB will enhance the use of SMAP Level-1 data for other applications, such as sea surface salinity and winds. 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. |
| DOI | 10.5067/SMP50-3TMCS |
| Measurement | OCEANS > OCEAN WINDS > SURFACE WINDS OCEANS > SALINITY/DENSITY > SALINITY |
| 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 kilometers Description: Spacecraft angular distance from orbital plane relative to the Equator. |
| Project | Soil Moisture Active Passive (SMAP) |
| Data Provider | Publisher: JPL Creator: JPL Release Place: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA91109, USA Release Date: 2020-Dec-11 Resource: http://podaac.jpl.nasa.gov/smap |
| Format | netCDF-4 |
| Keyword(s) | JPLSMAPSSSV50, 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
Resolution Spatial Resolution: 0.6 Decimal Degrees x 0.6 Decimal Degrees Temporal Resolution: Monthly - < Annual Coverage Region: GLOBAL North 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 2024-Jan-01 Projection Projection Type: Gridded Ellipsoid: WGS 84 |
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| Available for access in-region with AWS Cloud | |
Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/SMAP_JPL_L3_SSS_CAP_MONTHLY_V5/ | |
| podaac-ops-cumulus-public/SMAP_JPL_L3_SSS_CAP_MONTHLY_V5/ | |
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| TOOLS AND SERVICES | |
| Data Subscriber | |
| Name | Long Name | Unit |
|---|---|---|
| anc_sss | HYCOM sea surface salinity | 1e-3 |
| anc_sst | Sea surface temperature | K |
| ice_fraction | Average ice fraction | |
| land_fraction | Average land fraction | |
| latitude | latitude of grid cell | degrees_north |
| longitude | longitude of grid cell | degrees_east |
| smap_high_spd | SMAP 10 m wind speed (using ancillary SSS) | m s-1 |
| smap_spd | SMAP 10 m wind speed | m s-1 |
| smap_sss | SMAP sea surface salinity | 1e-3 |
| smap_sss_uncertainty | SMAP SSS uncertainty | 1e-3 |
| time | Reference time of sss field | seconds since 2015-1-1 00:00:00 UTC |
| weight | Sum of Gaussian weighting factors |
| DATA RECIPE | |
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| DATA CITATION POLICY | |
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Citation is critically important for dataset documentation and discovery. Please cite the data as follows, and cite the reference papers when it is appropriate.
| Citation | JPL. 2020. JPL CAP SMAP Sea Surface Salinity Products. Ver. 5.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/SMP50-3TMCS
For more information see Data Citations and Acknowledgments.
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| 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 . |
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| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| 5.0 | JPL SMAP Level 3 CAP Sea Surface Salinity Standard Mapped Image Monthly V5.0 Validated Dataset | 2022-02-08 | ACTIVE | 2022-02-08T16:52:00.000Z |
| 5.0 | NASA Salinity Dielectric constant experimental data | Present | ACTIVE | |
| 4.3 | JPL SMAP Level 3 CAP Sea Surface Salinity Standard Mapped Image Monthly V4.3 Validated Dataset | Present | RETIRED. | |
| 4.2 | JPL SMAP Level 3 CAP Sea Surface Salinity Standard Mapped Image Monthly V4.2 Validated Dataset | Present | RETIRED. | |
| 4.0 | JPL SMAP Level 3 CAP Sea Surface Salinity Standard Mapped Image Monthly V4.0 Validated Dataset | Present | RETIRED. | |
| 3.0 | JPL SMAP Level 3 CAP Sea Surface Salinity Standard Mapped Image Monthly V3.0 Validated Dataset | 2024-02-20 | RETIRED. | 2024-02-20T22:21:00.000Z |