RSS SMAP Level 2C Sea Surface Salinity V4.0 Validated Dataset

Description

The version 4.0 SMAP-SSS, level 2C product contains the fourth release of the validated sea surface salinity orbital/swath data from the NASA Soil Moisture Active Passive (SMAP) observatory, and is produced operationally by Remote Sensing Systems (RSS). 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. The SMAP-SSS L2C product includes data for a range of parameters: derived sea surface salinity (SSS) with SSS-uncertainty, brightness temperatures for each radiometer polarization, antenna temperatures, collocated wind speed, data and ancillary reference surface salinity data from HYCOM, rain rate, 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. Observations are global in extent and provided at a 0.25 degree x 0.25 degree grid with an approximate spatial feature resolution of 40KM. 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.

Resources

Name Format Description Link
21 Search results for publications that cite this dataset by its DOI. https://scholar.google.com/scholar?q=10.5067%2FSMP40-2SOCS
21 SMAP-SSS Project and Instrument Overview http://podaac.jpl.nasa.gov/smap
21 Information on Data Outages & Known Issues https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/aquarius/open/README.KnownIssues.txt
21 Generic data readers https://github.com/podaac/data-readers
21 Remote Sensing Systems SMAP Sea Surface Salinity Website http://www.remss.com/missions/smap
21 Dynamically updated RSS webpage listing L2 files with Bad Orbits http://images.remss.com/figures/missions/smap/bad_orbits.txt
21 NASA SMAP Mission Website https://smap.jpl.nasa.gov/
21 Data Use and Citation Policy https://podaac.jpl.nasa.gov/CitingPODAAC
21 Browse and download granules over HTTPS using the virtual directories https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2036880739-POCLOUD
21 Browse granule search results in Earthdata Search https://search.earthdata.nasa.gov/search/granules?p=C2036880739-POCLOUD
33 ATBD, Validation Analysis, Product Specifications, etc https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/smap/open/docs/V4/RSS_SMAP-SSS_V4.0_TechnicalDocumentation.pdf
21 Known issues README https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/smap/open/L2/RSS/README.txt
22 Thumbnail https://podaac.jpl.nasa.gov/Podaac/thumbnails/SMAP_RSS_L2_SSS_V4.jpg
21 Dynamically updated RSS webpage listing L2 files with missing ancillary inputs http://images.remss.com/figures/missions/smap/bad_ancillaries.txt

Tags

  • salinity-density
  • oceans
  • earth-science

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