JPL SMAP Level 2B Near Real-time CAP Sea Surface Salinity V5.0 Validated Dataset
(SMAP_JPL_L2B_NRT_SSS_CAP_V5)
3 Publications Cited this Dataset
Citation metrics available for years (2014-2022)
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Publications citing JPL SMAP Level 2B Near Real-time CAP Sea Surface Salinity V5.0 Validated Dataset
Citation metrics available for years (2014-2022)
Year | Citation |
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2021 | Validating salinity from SMAP with saildrones and research vessel data during EUREC4A-OA/ATOMIC, Preprint ,10.20944/preprints202108.0461.v1 |
2022 | Impact of Rain Effects on L-Band Passive Microwave Satellite Observations Over the Ocean, IEEE Transactions on Geoscience and Remote Sensing ,10.1109/TGRS.2022.3232402 |
2022 | Retrieving Mediterranean sea surface salinity distribution and interannual trends from multi-sensor satellite and in situ data, Remote Sensing ,10.3390/rs14102502 |
Version | 5.0 |
Processing Level | 2 |
Start/Stop Date | 2015-Apr-01 to Present |
Short Name | SMAP_JPL_L2B_NRT_SSS_CAP_V5 |
Description | This is the PI-produced JPL SMAP-SSS V5.0, level 2B NRT CAP, validated sea surface salinity (SSS) and extreme winds orbital/swath product from the NASA Soil Moisture Active Passive (SMAP) observatory available in near real-time with a latency of about 6 hours. 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. The JPL SMAP-SSS L2B CAP NRT product includes data for a range of parameters: derived SMAP sea surface salinity, SSS uncertainty and wind speed/direction data for extreme winds, brightness temperatures for each radiometer polarization, ancillary reference surface salinity, ice concentration, wind and wave height data, quality flags, and navigation data. Each data file covers one 98-minute orbit (15 files per day). Data begins on April 1,2015 and is ongoing, with a 6 hour latency in processing and availability. Observations are global in extent and provided at 25km swath grid with an approximate spatial resolution of 60 km.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. |
DOI | 10.5067/SMP50-2NOCS |
Measurement | OCEANS > SALINITY/DENSITY > SALINITY |
Swath Width | 1000 km |
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 | HDF5 |
Keyword(s) | JPLSMAPSSSV50, SMAP, SMAP-SSS, Soil Moisture Active Passive, salinity, polar, sun-synchronous, sss, psu, NASA, project, mission, JPL, CAP, combined active/passive, L2B |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 25000 Meters x 25000 Meters Temporal Resolution: Weekly - < Monthly 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: 2022-Jan-13 to 2024-Oct-11Swath Width: 1000 km Projection Projection Type: Swath Ellipsoid: WGS 84 |
DIRECT ACCESS | |
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Available for access in-region with AWS Cloud | |
Region | |
us-west-2 | |
podaac-ops-cumulus-protected/SMAP_JPL_L2B_NRT_SSS_CAP_V5/ | |
podaac-ops-cumulus-public/SMAP_JPL_L2B_NRT_SSS_CAP_V5/ | |
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TOOLS AND SERVICES | |
Data Subscriber |
Name | Long Name | Unit |
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anc_dir | NCEP wind direction (oceanographic convention) | Degrees |
anc_spd | 10 meter NCEP wind speed (scaled by 1.03) | Meters/second |
anc_sss | HYCOM salinity | PSU |
anc_sst | NOAA Optimum Interpolation sea surface temperature | Degrees kelvin |
anc_swh | NOAA WaveWatch III significant wave height | Meters |
antazi_aft | Antenna azimuth angle aft look | Degrees |
antazi_fore | Antenna azimuth angle fore look | Degrees |
azi_aft | Cell azimuth angle aft look | Degrees |
azi_fore | Cell azimuth angle fore look | Degrees |
ice_concentration | Ice concentration | |
inc_aft | Cell incidence angle aft look | Degrees |
inc_fore | Cell incidence angle fore look | Degrees |
land_fraction_aft | Average land fraction for aft look | |
land_fraction_fore | Average land fraction for fore look | |
lat | latitude | Degrees |
lon | longitude | Degrees |
n_h_aft | Number of L1B TBs aggregated into H-pol aft look | |
n_h_fore | Number of L1B TBs aggregated into H-pol fore look | |
n_v_aft | Number of L1B TBs aggregated into V-pol aft look | |
n_v_fore | Number of L1B TBs aggregated into V-pol fore look | |
nedt_h_aft | Aggregated noise equivilent Delta T for H-pol aft look | Degrees kelvin |
nedt_h_fore | Aggregated noise equivilent Delta T for H-pol fore look | Degrees kelvin |
nedt_v_aft | Aggregated noise equivilent Delta T for V-pol aft look | Degrees kelvin |
nedt_v_fore | Aggregated noise equivilent Delta T for V-pol fore look | Degrees kelvin |
num_ambiguities | Number of wind vector ambiguties | |
quality_flag | Quality flag | |
row_time | Approximate observation time for each row | UTC seconds of day |
smap_ambiguity_dir | SMAP ambiguity wind direction using ancillary SSS | Degrees |
smap_ambiguity_spd | SMAP ambiguity wind speed using ancillary SSS | Meters/second |
smap_high_dir | SMAP wind direction using ancillary SSS | Degrees |
smap_high_dir_smooth | SMAP wind direction using ancillary SSS and DIRTH smoothing | Degrees |
smap_high_spd | SMAP wind speed using ancillary SSS | Meters/second |
smap_spd | SMAP wind speed | Meters/second |
smap_sss | SMAP sea surface salinity | PSU |
smap_sss_uncertainty | SMAP sea surface salinity uncertainty | PSU |
tb_h_aft | Average brightness temperature for all H-pol aft looks | Degrees kelvin |
tb_h_bias_adj | Brightness temperature bias adjustment for H-pol | Degrees kelvin |
tb_h_fore | Average brightness temperature for all H-pol fore looks | Degrees kelvin |
tb_v_aft | Average brightness temperature for all V-pol aft looks | Degrees kelvin |
tb_v_bias_adj | Brightness temperature bias adjustment for V-pol | Degrees kelvin |
tb_v_fore | Average brightness temperature for all V-pol fore looks | Degrees kelvin |
GENERAL DOCUMENTATION | |
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USER'S GUIDE | |
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ANOMALIES | |
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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/SMP50-2NOCS
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 . |
Version | Dataset | Version Date | Status | |
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5.0 | JPL SMAP Level 2B Near Real-time CAP Sea Surface Salinity V5.0 Validated Dataset | 2022-02-08 | ACTIVE | 2022-02-08T17:14:00.000Z |
5.0 | JPL SMAP Level 2B Near Real-time CAP Sea Surface Salinity V5.0 Validated Dataset (2 hour latency) | 2023-05-08 | ACTIVE | 2023-05-08T15:18:00.000Z |
4.3 | JPL SMAP Level 2B Near Real-time CAP Sea Surface Salinity V4.3 Validated Dataset | 2023-09-27 | RETIRED. | 2023-09-27T15:19:00.000Z |
4.2 | JPL SMAP Level 2B Near Real-time CAP Sea Surface Salinity V4.2 Validated Dataset | Present | RETIRED. | |