RSS SMAP Level 2C Sea Surface Salinity NRT V5.0 Validated Dataset
(SMAP_RSS_L2_SSS_NRT_V5)| Version | 5.0 |
| Processing Level | 2 |
| Start/Stop Date | 2022-Jul-28 to Present |
| Short Name | SMAP_RSS_L2_SSS_NRT_V5 |
| Description | The SMAP-SSS level 2C near real-time (NRT) V5.0 dataset produced by the Remote Sensing Systems (RSS) and sponsored by the NASA Ocean Salinity Science Team, is a validated product that provides near real-time orbital/swath data on sea surface salinity (SSS) derived from the NASA's Soil Moisture Active Passive (SMAP) mission. SMAP, launched on January 31, 2015, was initially designed to measure and map Earth's soil moisture and freeze/thaw state to better understand terrestrial water, carbon and energy cycles, and has been adapted to measure ocean SSS and ocean wind speed using its passive microwave instrument. The SMAP instrument is in a near polar orbiting, sun synchronous orbit with a nominal 8 day repeat cycle.
The dataset includes derived SMAP SSS, SSS uncertainty using the NRT SMAP Salinity Retrieval Algorithm, top of atmosphere brightness temperature (TB), wind speed and direction data for extreme winds, and other all necessary ancillary data and the results of all intermediate steps. Data from July 28, 2022 to present, is available with a latency of about 6 hours. The observations are global, provided on a 0.25° fixed Earth grid with an approximate spatial resolution of 70 km. The major differences to the standard version 5.0 data products are: (1) the NRT version of the L1B SMAP antenna temperatures is used, (2) the latest 6-hourly 0.25° wind speed and direction are used for the ancillary wind speed and direction input, (3) the CMC SST from 2 days earlier is used for the ancillary SST input, (4) the sea-ice mask of the 3-day aggregate RSS AMSR-2 Air-Sea Essential Climate Variables (AS-ECV) data set from 2-days earlier is used for the sea-ice flag, (5) no correction for sea-ice contamination is performed, it is recommended to use only SMAP data that are classified to be within sea-ice zone 0 for open ocean scene and no sea-ice contamination. This RSS SMAP-SSS V5.0 NRT dataset holds tremendous potential for scientific research and various applications. Given the SMAP satellite's near-polar orbit and sun-synchronous nature with its 1000km swath, it achieves global coverage in approximately three days, enabling researchers to monitor and model global oceanic and climatic phenomena with unprecedented detail and timeliness. These data can inform and enhance understanding of global weather patterns, the Earth’s hydrological cycle, ocean circulation, and climate change. |
| DOI | 10.5067/SMP50-2SNRT |
| Measurement | OCEANS > SALINITY/DENSITY > SALINITY |
| Swath Width | 1000 km |
| Platform/Sensor | SMAP / Platform Name: Soil Moisture Active and Passive Observatory (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: Remote Sensing Systems (RSS) Creator: Remote Sensing Systems (RSS) Release Place: Remote Sensing Systems, 444 Tenth Street, Suite 200, Santa Rosa, CA 95401, USA Release Date: 2023-Jul-17 Resource: http://podaac.jpl.nasa.gov/smap |
| Format | netCDF-4 |
| Keyword(s) | RssSmapSSSv5, V5, SMAP, SMAP-SSS, Soil Moisture Active Passive, salinity, polar, sun-synchronous, sss, psu, NASA, project, mission, RSS, Remote Sensing System, REMSS, NRT, near real-time |
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution Spatial Resolution: 0.25 Decimal Degrees x 0.25 Decimal Degrees Temporal Resolution: Hourly - < Daily 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: 2022-Jul-28 to PresentSwath Width: 1000 km Projection Projection Type: Grid |
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Region | |
| us-west-2 | |
| podaac-ops-cumulus-protected/SMAP_RSS_L2_SSS_NRT_V5/ | |
| podaac-ops-cumulus-public/SMAP_RSS_L2_SSS_NRT_V5/ | |
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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 | Remote Sensing Systems (RSS). 2023. SMAP Sea Surface Salinity Products. Ver. 5.0. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/SMP50-2SNRT
For more information see Data Citations and Acknowledgments.
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| Journal Reference | Meissner, T. and F. J. Wentz, 2018: Remote Sensing Sytems SMAP Ocean Surface Salinities, Version 4.0 validated release. Remote Sensing Systems, Santa Rosa, CA, USA. . |
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| Version | Dataset | Version Date | Status | |
|---|---|---|---|---|
| 6.0 | RSS SMAP Level 2C Sea Surface Salinity V6.0 Validated Dataset | 2024-01-08 | ACTIVE | 2024-01-08T18:42:00.000Z |
| 6.0 | RSS SMAP Level 2C Sea Surface Salinity NRT V6.0 Validated Dataset | 2024-01-08 | ACTIVE | 2024-01-08T18:49:00.000Z |
| 5.3 | RSS SMAP Level 2C Sea Surface Salinity NRT V5.3 Validated Dataset | 2024-04-16 | ACTIVE | 2024-04-16T15:57:00.000Z |
| 5.3 | RSS SMAP Level 2C Sea Surface Salinity V5.3 Validated Dataset | 2024-04-16 | ACTIVE | 2024-04-16T15:59:00.000Z |
| 5.0 | RSS SMAP Level 2C Sea Surface Salinity V5.0 Validated Dataset | 2022-07-19 | ACTIVE | 2022-07-19T17:30:00.000Z |
| 5.0 | RSS SMAP Level 2C Sea Surface Salinity NRT V5.0 Validated Dataset | 2023-04-03 | ACTIVE | 2023-04-03T18:13:00.000Z |
| 4.0 | RSS SMAP Level 2C Sea Surface Salinity V4.0 Validated Dataset | 2021-09-01 | ACTIVE | 2021-09-01T15:58:00.000Z |
| 3.0 | RSS SMAP Level 2 Sea Surface Salinity V3.0 40km Validated Dataset | Present | RETIRED. | |
| 2.0 | RSS SMAP Level 2C Sea Surface Salinity V2.0 Validated Dataset | 2024-03-20 | RETIRED. | 2024-03-20T15:30:00.000Z |