GHRSST Level 3U NOAA ACSPO SST v2.80 from VIIRS on NOAA-21 Satellite

Description

The N21-VIIRS-L3U-ACSPO-v2.80 dataset produced by the NOAA ACSPO system derives the Subskin Sea Surface Temperature (SST) from the Visible Infrared Imaging Radiometer Suite (VIIRS) onboard the Joint Polar Satellite System (JPSS)-2 satellite, renamed as NOAA-21 (N21). N21 was launched on Nov. 10, 2022, the 3rd satellite in the US NOAA latest JPSS series.

The ACSPO N21 VIIRS L3U (Level 3 Uncollated) product is a gridded version of the ACSPO N21 VIIRS L2P product, also available at PO.DAAC (10.5067/GHV21-2P290). The L3U output files are 10-minute granules in netCDF4 format, compliant with the Group for High Resolution Sea Surface Temperature (GHRSST) Data Specification version 2 (GDS2). The ACSPO N21 VIIRS SST record is available back to 19 Mar 2023. There are 144 granules per 24hr interval, with a total data volume of 0.5GB/day. Fill values are reported at all invalid pixels, including pixels with >5 km inland. For each valid water pixel (defined as ocean, sea, lake or river, and up to 5 km inland), the following layers are reported: SSTs, a subset of l2p_flags (including day/night, land, ice, twilight, and glint flags), wind speed, and ACSPO SST minus reference (Canadian Met Centre 0.1deg L4 SST, 10.5067/GHCMC-4FM03). Only L2P SSTs with QL=5 were gridded, so all valid SSTs are recommended for the users. Per GDS2 specifications, two additional Sensor-Specific Error Statistics layers (SSES bias and standard deviation) are reported in each pixel with valid SST.

The ACSPO VIIRS L3U product is monitored and validated against quality controlled in situ data provided by NOAA in situ SST Quality Monitor system (iQuam) using another NOAA system, SST Quality Monitor (SQUAM).

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%2FGHN21-3U280
22 Thumbnail https://podaac.jpl.nasa.gov/Podaac/thumbnails/VIIRS_N20-STAR-L3U-v2.80.jpg
33 Documentation on the GDS version 2 format specification https://archive.podaac.earthdata.nasa.gov/podaac-ops-cumulus-docs/ghrsst/open/docs/GDS20r5.pdf
21 GHRSST Global Data Assembly Center and data access https://ghrsst.jpl.nasa.gov
21 Sea Surface Temperature measurement description. https://podaac.jpl.nasa.gov/forum/viewtopic.php?f=7&t=298
21 Monitoring of IR Clear-sky Radiances over Oceans for SST https://www.star.nesdis.noaa.gov/sod/sst/micros/
21 SST Quality Monitor (SQUAM) https://www.star.nesdis.noaa.gov/sod/sst/squam/
21 Data Use and Citation Policy https://podaac.jpl.nasa.gov/CitingPODAAC
21 GHRSST Project https://www.ghrsst.org/
21 Browse granule search results in Earthdata Search https://search.earthdata.nasa.gov/search/granules?p=C2147488020-POCLOUD
21 In situ SST Quality Monitor (iQUAM) https://www.star.nesdis.noaa.gov/sod/sst/iquam/
21 Generic Data Readers https://github.com/podaac/data-readers
21 HTTPS endpoint for data browse and download https://cmr.earthdata.nasa.gov/virtual-directory/collections/C2147488020-POCLOUD

Tags

  • oceans
  • ocean-temperature
  • earth-science

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