N: 90 S: -90 E: 180 W: -180
Description
These files contain NASA produced skin sea surface temperature (SST) products from the Infrared (IR) channels of the Visible and Infrared Imager/Radiometer Suite (VIIRS) onboard the Suomi-NPP satellite. VIIRS is a multi-disciplinary instrument that is also being flown on the Joint Polar Satellite System (JPSS) series of spacecraft, of which NOAA-20 is the first. JPSS is a multi-agency program that consolidates the polar orbiting spacecraft of NASA and the National Oceanic and Atmospheric Administration (NOAA). Suomi-NPP is the initial spacecraft in this series, and VIIRS is the successor to MODIS for Earth science data. VIIRS has 22 spectral bands ranging from 412 nm to 12 micron . There are 16 moderate-resolution bands (750m at nadir), 5 image-resolution bands (375 m), and one day-night band (DNB). VIIRS uses on-board pixel aggregation to reduce the growth in size of pixels away from nadir. Two SST products are contained in these files. The first is a skin SST produced separately for day and night observations, derived from the long wave IR 11 and 12 micron wavelength channels, using a modified nonlinear SST algorithm intended to provide continuity of SST products from heritage and current NASA sensors. At night, a second triple channel SST product is generated using the 3.7 , 11 and 12 micron IR channels, identified as SST_triple. Due to the sun glint in the 3.7 micron SST_triple can only be used at night. VIIRS L2P SST data have a 750 spatial resolution at nadir and are stored in ~288 five minute granules per day. Full global coverage is obtained each day. The production of VIIRS NASA L2P SST files is part of the Group for High Resolution Sea Surface Temperature (GHRSST) project and is a joint collaboration between the NASA Jet Propulsion Laboratory (JPL), the NASA Ocean Biology Processing Group (OBPG), and the Rosenstiel School of Marine and Atmospheric Science (RSMAS). Researchers at RSMAS were responsible for sea surface temperature algorithm development, error statistics and quality flagging, while the OBPG, as the NASA ground data system, is responsible for the production of VIIRS ocean products. JPL acquires VIIRS ocean granules from the OBPG and reformats them to the GHRSST L2P netCDF specification with complete metadata and is the official Physical Oceanography Data Archive (PO.DAAC) for SST. In mid-August, 2018, the RSMAS involvement in the VIIRS SST project ceased, and the subsequent fields are not maintained.The R2016.2 supersedes the previous v2016.0 datasets which can be found at https://doi.org/10.5067/GHVRS-2PN16
Product Summary
Citation
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Documents
USER'S GUIDE
ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
DATA CITATION GUIDELINES
GENERAL DOCUMENTATION
Variables
Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.
The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.
| Name Sort descending | Description | Units | Data Type | Fill Value | Valid Range | Scale Factor |
|---|---|---|---|---|---|---|
| dt_analysis | TBD | kelvin | byte | -128 | -127 to 127 | 0.1 |
| l2p_flags | These flags can be used to further filter data variables | N/A | short | N/A | 0 to 16 | 1 |
| lat | geographical coordinates, WGS84 projection | degrees_north | float | -999 | -90 to 90 | 1 |
| lon | geographical coordinates, WGS84 projection | degrees_east | float | -999 | -180 to 180 | 1 |
| quality_level | thermal IR SST quality value; signed byte array: WARNING Some applications are unable to properly handle signed byte values. If values are encountered > 127, please subtract 256 from this reported value | N/A | byte | -128 | 0 to 5 | 1 |
| quality_level_3chan | 3 channel SST quality value; signed byte array: WARNING Some applications are unable to properly handle signed byte values. If values are encountered > 127, please subtract 256 from this reported value | N/A | byte | -128 | 0 to 5 | 1 |
| sea_surface_temperature | sea surface temperature from 11 and 12 um (thermal IR) channels | kelvin | short | -32767 | -1000 to 10000 | 0.005 |
| sea_surface_temperature_3chan | sea surface temperature from 3.7, 11, and 12 um channels (3 channels); non L2P core field; generally only nighttime SST | kelvin | short | -32767 | -1000 to 10000 | 0.005 |
| sses_bias | thermal IR SST bias error; signed byte array: WARNING Some applications are unable to properly handle signed byte values. If values are encountered > 127, please subtract 256 from this reported value | kelvin | byte | -128 | -127 to 127 | 0.15748031 |
| sses_bias_3chan | 3 channel SST bias error; signed byte array: WARNING Some applications are unable to properly handle signed byte values. If values are encountered > 127, please subtract 256 from this reported value | kelvin | byte | -128 | -127 to 127 | 0.15748031 |
| sses_standard_deviation | thermal IR SST standard deviation error; signed byte array: WARNING Some applications are unable to properly handle signed byte values. If values are encountered > 127, please subtract 256 from this reported value | kelvin | byte | -128 | -127 to 127 | 0.07874016 |
| sses_standard_deviation_3chan | 3 channel SST standard deviation error; signed byte array: WARNING Some applications are unable to properly handle signed byte values. If values are encountered > 127, please subtract 256 from this reported value | kelvin | byte | -128 | -127 to 127 | 0.07874016 |
| sst_dtime | time plus sst_dtime gives seconds after 00:00:00 UTC January 1, 1981 | seconds | short | -32768 | -32767 to 32767 | 1 |
| time | time of first sensor observation | seconds since 1981-01-01 00:00:00 | int | N/A | N/A | 1 |
| wind_speed | Wind at 10 meters above the sea surface | m s-1 | byte | -128 | -127 to 127 | 0.2 |