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    • JPL SMAP Level 2B Near Real-time (2Hr Latency) CAP Sea Surface Salinity V5.0 Validated Dataset

    Metadata Updated: December 6, 2023

    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.

    Access & Use Information

    Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

    Downloads & Resources

    Dates

    Metadata Created Date May 30, 2023
    Metadata Updated Date December 6, 2023

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    Thumbnail

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date May 30, 2023
    Metadata Updated Date December 6, 2023
    Publisher NASA/JPL/PODAAC
    Maintainer
    Identifier C2681262364-POCLOUD
    Data First Published 2020-09-07
    Language en-US
    Data Last Modified 2020-09-07
    Category SMAP, geospatial
    Public Access Level public
    Bureau Code 026:00
    Metadata Context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
    Metadata Catalog ID https://data.nasa.gov/data.json
    Schema Version https://project-open-data.cio.gov/v1.1/schema
    Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
    Citation JPL. 2020-12-11. JPL SMAP Level 2B Near Real-time CAP Sea Surface Salinity Validated Dataset. Version 5.0. JPL CAP SMAP Sea Surface Salinity Products. Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA91109, USA. Archived by National Aeronautics and Space Administration, U.S. Government, JPL. https://doi.org/10.5067/SMP50-2N2CS. http://podaac.jpl.nasa.gov/smap. JPL, JPL, 2020-12-11, JPL SMAP Level 2B Near Real-time CAP Sea Surface Salinity V5.0 Validated Dataset, http://podaac.jpl.nasa.gov/smap.
    Creator JPL
    Graphic Preview Description Thumbnail
    Graphic Preview File https://podaac.jpl.nasa.gov/Podaac/thumbnails/SMAP_JPL_L2B_NRT2_SSS_CAP_V5.jpg
    Harvest Object Id e7559349-c9fc-4053-b1e7-a3da2407c3d1
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/SMP50-2N2CS
    Metadata Type geospatial
    Old Spatial -180.0 -90.0 180.0 90.0
    Program Code 026:001
    Release Place Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA91109, USA
    Series Name JPL SMAP Level 2B Near Real-time CAP Sea Surface Salinity Validated Dataset
    Source Datajson Identifier True
    Source Hash 57cf7ea0bbab5ee4ec05aea4d4208d6c195e88d9ec99a367ca0fa0aa758970a4
    Source Schema Version 1.1
    Spatial
    Temporal 2015-04-01T00:44:02Z/2023-05-15T00:00:00Z

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