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    • RSS SMAP Level 3 Sea Surface Salinity Standard Mapped Image Monthly V4.0 Validated Dataset

    Metadata Updated: December 7, 2023

    The version 4.0 SMAP-SSS level 3, monthly gridded product is based on the fourth release of the validated standard mapped sea surface salinity (SSS) data from the NASA Soil Moisture Active Passive (SMAP) observatory, produced operationally by Remote Sensing Systems (RSS) with a one-month latency. Enhancements with this release include: use of an improved 0.125 degree land correction table with land emission based on SMAP TB; replacement of the previous NCEP sea-ice mask with one based on RSS AMSR-2 and implementing a sea-ice threshold of 0.3% (gain weighted sea-ice fraction); revised solar flagging that depends on glint angle and wind speed; inclusion of estimated SSS-uncertainty; consolidation of both 40KM and 70KM SMAP-SSS datasets as variable fields in a single data product. Monthly data files for this product are averages over one-month time intervals. SMAP data begins on April 1,2015 and is ongoing, with a one-month latency in processing and availability. L3 products are global in extent and gridded at 0.25degree x 0.25degree with a default spatial feature resolution of approximately 70KM. Note that while a SSS 40KM variable is also included in the product, for most open ocean applications, the default SSS variable (70KM) is best used as they are significantly less noisy than the 40KM data. 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, primarily from WindSat, 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.

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    Dates

    Metadata Created Date December 1, 2022
    Metadata Updated Date December 7, 2023

    Metadata Source

    Harvested from NASA Data.json

    Other Data Resources

    Graphic Preview

    Thumbnail

    Additional Metadata

    Resource Type Dataset
    Metadata Created Date December 1, 2022
    Metadata Updated Date December 7, 2023
    Publisher NASA/JPL/PODAAC
    Maintainer
    Identifier C2036878255-POCLOUD
    Data First Published 2019-05-07
    Language en-US
    Data Last Modified 2019-05-07
    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 Remote Sensing Systems (RSS). 2019-08-28. RSS SMAP Level 3 Sea Surface Salinity Standard Mapped Image Monthly Vaidated Dataset. Version 4.0. SMAP Sea Surface Salinity Products. Remote Sensing Systems, 444 Tenth Street, Suite 200, Santa Rosa, CA 95401, USA. Archived by National Aeronautics and Space Administration, U.S. Government, Remote Sensing Systems (RSS). https://doi.org/10.5067/SMP40-3SMCS. http://podaac.jpl.nasa.gov/smap. Remote Sensing Systems (RSS), Remote Sensing Systems (RSS), 2019-08-28, RSS SMAP Level 3 Sea Surface Salinity Standard Mapped Image Monthly V4.0 Validated Dataset, http://podaac.jpl.nasa.gov/smap.
    Creator Remote Sensing Systems (RSS)
    Graphic Preview Description Thumbnail
    Graphic Preview File https://podaac.jpl.nasa.gov/Podaac/thumbnails/SMAP_RSS_L3_SSS_SMI_MONTHLY_V4.jpg
    Harvest Object Id fea5e22b-5a98-4663-becf-8503782f2dc7
    Harvest Source Id 58f92550-7a01-4f00-b1b2-8dc953bd598f
    Harvest Source Title NASA Data.json
    Homepage URL https://doi.org/10.5067/SMP40-3SMCS
    Metadata Type geospatial
    Old Spatial -180.0 -90.0 180.0 90.0
    Program Code 026:001
    Release Place Remote Sensing Systems, 444 Tenth Street, Suite 200, Santa Rosa, CA 95401, USA
    Series Name RSS SMAP Level 3 Sea Surface Salinity Standard Mapped Image Monthly Vaidated Dataset
    Source Datajson Identifier True
    Source Hash 601704bcee10a17ea7c4a2dcfa199d030dcbc49a5915978e5e8fc0e86442e08b
    Source Schema Version 1.1
    Spatial
    Temporal 2015-04-01T00:00:00Z/2023-02-28T00:00:00Z

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