GHRSST Level 2P NOAA ACSPO SST v2.80 from VIIRS on NOAA-21 Satellite
(N21-VIIRS-L2P-ACSPO-v2.80)| Version | 2.80 |
| Processing Level | 2P |
| Start/Stop Date | 2023-Mar-19 to Present |
| Short Name | N21-VIIRS-L2P-ACSPO-v2.80 |
| Description | The N21-VIIRS-L2P-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 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. VIIRS L2P SST products are 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 (Jonasson et al. 2022). Data are reported in 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. In ACSPO products, SSTs are derived 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 with quality level QL=5 are recommended. 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 N21 VIIRS L3U product is also available (10.5067/GHV21-3U280) (Ignatov et al., 2017). |
| DOI | 10.5067/GHN21-2P280 |
| Measurement | OCEANS > OCEAN TEMPERATURE > SEA SURFACE TEMPERATURE |
| Swath Width | 3040 km |
| Platform/Sensor | NOAA-21 / Platform Name: Joint Polar Satellite System - 2 (NOAA-21) 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. |
| Project | Group for High Resolution Sea Surface Temperature (GHRSST) |
| Data Provider | Publisher: PO.DAAC Creator: NOAA/NESDIS/STAR Release Place: Suitland, MD, USA Release Date: 2023-Nov-09 Resource: https://www.star.nesdis.noaa.gov/star/index.php |
| Format | netCDF-4 |
| Keyword(s) | NOAA, STAR, VIIRS, ACSPO, OSPO, SST, GHRSST, GDS2, N21, 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: 2023-Mar-19 to Present Granule Time Span: 2023-Mar-19 to 2025-Oct-10Swath Width: 3040 km Projection Projection Type: Satellite native swath Projection Detail: Geolocation information included for each pixel Ellipsoid: WGS 84 |
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| us-west-2 | |
| podaac-ops-cumulus-protected/N21-VIIRS-L2P-ACSPO-v2.80/ | |
| podaac-ops-cumulus-public/N21-VIIRS-L2P-ACSPO-v2.80/ | |
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| Name | Long Name | Unit |
|---|---|---|
| dt_analysis | deviation from SST reference | kelvin |
| l2p_flags | L2P flags | |
| lat | latitude | degrees_north |
| lon | longitude | degrees_east |
| quality_level | quality level of SST pixel | |
| satellite_zenith_angle | satellite zenith angle | degrees |
| sea_ice_fraction | sea ice fraction | 1 |
| sea_surface_temperature | sea_surface_subskin_temperature | kelvin |
| sses_bias | SSES bias estimate | kelvin |
| sses_standard_deviation | SSES standard deviation | kelvin |
| sst_dtime | time difference from reference time | seconds |
| sst_front_position | Binary SST front position indicator | |
| sst_gradient_magnitude | SST gradient magnitude value | kelvin/km |
| time | reference time of sst file | seconds since 1981-01-01 00:00:00 |
| wind_speed | wind speed | m 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. 2023. GHRSST Level 2P NOAA ACSPO SST v2.80 from VIIRS on NOAA-21 Satellite. Ver. 2.80. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/GHN21-2P280
For more information see Data Citations and Acknowledgments.
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| Journal Reference | O. Jonasson, A. Ignatov, V. Pryamitsyn, B. Petrenko, Y. Kihai. . 2022. JPSS VIIRS SST Reanalysis Version 3, Remote Sensing, 14, 4. https://doi.org//10.3390/rs14143476 B. Petrenko, A. Ignatov, Y. Kihai, J. Stroup, P. Dash. 2023. 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. 2023. 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 |
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