GHRSST Level 2P NOAA STAR SST v2.80 from VIIRS on NOAA-20 Satellite

(VIIRS_N20-STAR-L2P-v2.80)
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Citation metrics available for years (2014-2022)
Version2.80
Processing Level2P
Start/Stop Date2018-Jan-05 to Present
Short NameVIIRS_N20-STAR-L2P-v2.80
DescriptionNOAA-20 (N20/JPSS-1/J1) is the second satellite in the US NOAA latest generation Joint Polar Satellite System (JPSS), launched on November 18, 2017. NOAA is responsible for all JPSS products, including SST from the Visible Infrared Imaging Radiometer Suite (VIIRS). The L2P SST product is derived at the native sensor resolution (~0.75 km at nadir, ~1.5 km at swath edge) using NOAA's Advanced Clear-Sky Processor for Ocean (ACSPO) system, and reported in 10-minute granules in netCDF4 format, compliant with the Group for High Resolution Sea Surface Temperature (GHRSST) Data Specification version 2 (GDS2). SSTs are derived from Brightness Temperatures (BTs) using the Non-Linear SST (NLSST) algorithms (Petrenko et al., 2014). An ACSPO clear-sky mask (ACSM) is provided in each pixel as part of variable l2p_flags, which also includes day/night, land, ice, twilight, and glint flags (Petrenko et al., 2010). Only ACSM confidently clear pixels are recommended (equivalent to GDS2 quality level=5). Per GDS2 specifications, two additional Sensor-Specific Error Statistics layers (SSES bias and standard deviation) are reported in each pixel with QL=5. The ACSPO VIIRS L2P 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). A reduced size (0.5GB/day), equal-angle gridded (0.02-deg resolution), ACSPO L3U product is also available at https://podaac.jpl.nasa.gov/dataset/VIIRS_N20-STAR-L3U-v2.80 , where gridded L2P SSTs with QL=5 only are reported. The v2.80 is an updated version from the v2.61 with several algorithm improvements including two added thermal front layers, reduced L2P SST data size, mitigated warm biases in the high latitudes, and improved clear-sky mask.
DOI10.5067/GHV20-2PO28
MeasurementOCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE
Swath Width3040 km
Platform/Sensor
NOAA-20
Platform
Name: Joint Polar Satellite System - 1 (NOAA-20)
Orbit Period: 102.0 minutes
Inclination Angle: 99.0 degrees
/
VIIRS
SENSOR
Name: Visible-Infrared Imager-Radiometer Suite (VIIRS)
Swath Width: 3040.0 kilometers
Description: Spacecraft angular distance from orbital plane relative to the Equator.

ProjectGroup for High Resolution Sea Surface Temperature (GHRSST)
Data ProviderPublisher: PO.DAAC
Creator: NOAA/NESDIS/STAR
Release Place: Suitland, MD, USA
Release Date: 2021-Nov-25
Resource: https://www.star.nesdis.noaa.gov/star/index.php

FormatnetCDF-4
Keyword(s)NOAA, STAR, VIIRS, ACSPO, OSPO, SST, GHRSST, GDS2, N20, v2.80
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Resolution
Spatial Resolution: 750 Meters x 750 Meters
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: 2018-Jan-05 to Present
Granule Time Span: 2018-Jan-05 to 2024-Jun-06
Swath Width: 3040 km
 
Projection
Projection Type: Satellite native swath
Projection Detail: Geolocation information included for each pixel
Ellipsoid: WGS 84
 
NameLong NameUnit
dt_analysisdeviation from SST referencekelvin
l2p_flagsL2P flags
latlatitudedegrees_north
lonlongitudedegrees_east
quality_levelquality level of SST pixel
satellite_zenith_anglesatellite zenith angledegrees
sea_ice_fractionsea ice fraction1
sea_surface_temperaturesea_surface_subskin_temperaturekelvin
sses_biasSSES bias estimatekelvin
sses_standard_deviationSSES standard deviationkelvin
sst_dtimetime difference from reference timeseconds
sst_front_positionBinary SST front position indicator
sst_gradient_magnitudeSST gradient magnitude valuekelvin/km
timereference time of sst fileseconds since 1981-01-01 00:00:00
wind_speedwind speedm s-1
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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 NOAA/NESDIS/STAR. 2021. GHRSST Level 2P NOAA/ACSPO SST from VIIRS on the NOAA-20. Ver. 2.80. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/GHV20-2PO28

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For more information see Data Citations and Acknowledgments.
Journal Reference Petrenko, B., A. Ignatov, Y. Kihai, J. Stroup, P. Dash. 2014. Evaluation and Selection of SST Regression Algorithms for JPSS VIIRS, J. Geophys. Res. Atmos., 119, 8. https://doi.org//10.1002/2013JD020637

B. Petrenko, A. Ignatov, Y. Kihai, and A. Heidinger. 2010. Clear-Sky Mask for the Advanced Clear-Sky Processor for Oceans, Journal of Atmospheric and Oceanic Technology, 27, 10. https://doi.org/10.1175/2010JTECHA1413.1