N: 60 S: -60 E: -77 W: 163
Description
GOES-17 (G17) is the second satellite in the US NOAA's GOES-R series. It was launched on 1 Mar 2018 in an interim position at 89.5-deg W for initial Cal/Val, moved to its nominal position at 137.2-deg W in Nov 2018, and declared NOAA operational GOES-West satellite on 12 Feb 2019. Advanced Baseline Imager (ABI) is a 16 channel sensor, of which five (3.9, 8.4, 10.3, 11.2, 12.3 um) are suitable for SST. From altitude 35,800km, G17/ABI maps SST in a Full Disk (FD) area from 163E-77W and 60S-60N, with spatial resolution 2km/nadir to 15km/VZA 67-deg, and 10-min temporal sampling. The ABI L2P SST is derived at the native sensor resolution using NOAA ACSPO system. ACSPO processes every 10-min FD, identifies good-quality ocean pixels (Petrenko et al., 2010) and derives SST using Non-Linear SST (NLSST) algorithm (Petrenko et al., 2014). Unfortunately, the G17 ABI loop heat pipe (LHP) that should maintain the ABI at its intended temperature, is not operating at its designed capacity, which required mitigations to the ACSPO algorithms and releasing an updated ACSPO version 2.71 (Pennybacker et al, 2019). In particular, band 11.2um, most subject to calibration problems, is not used leading to a 3-band (8.4, 10.3, and 12.3um) NLSST, and increased calibration problems prevent SST retrievals at night. As a result, the G17 SST is only reported for 13 out of 24hrs/day, from 20UTC to 08UTC. The 10-min FD data are subsequently collated in time, to produce 1-hr product, with improved coverage and reduced cloud leakages and image noise. The collation algorithm also reduces G17 excessive sensor noise and striping to levels similar to G16. The collated SSTs are only reported over clear-sky water pixels. All pixels with valid SSTs are recommended for use. The L2P is reported in NetCDF4 GDS2 format, 13 granules per day, with a total data volume 0.3GB/day. ACSPO files also report sun-sensor geometry, wind speed and l2p_flags (day/night, land, ice, twilight, glint flags). Per GDS2 specifications, two Sensor-Specific Error Statistics (bias and standard deviation) are reported in each pixel (Petrenko et al., 2016). Pixel earth locations are not reported in the granules, as they remain unchanged from granule to granule. Those can be obtained using a flat lat/lon file or a Python script (see Documentation page). The ACSPO G17 ABI SSTs are continuously validated in SQUAM (Dash et al, 2010). A reduced size (0.1GB/day), 0.02-deg equal-angle gridded L3C product is available at https://podaac.jpl.nasa.gov/dataset/ABI_G17-STAR-L3C-v2.71.
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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 |
|---|---|---|---|---|---|---|
| brightness_temperature_08um6 | non L2P core field; brightness temperature for 8.6 um channel ABI Ch. 11 | kelvin | short | -32768 | -32767 to 32767 | 0.01 |
| brightness_temperature_10um4 | non L2P core field; brightness temperature for 10.4 um channel ABI Ch. 13 | kelvin | short | -32768 | -32767 to 32767 | 0.01 |
| brightness_temperature_11um2 | non L2P core field; brightness temperature for 11.2 um channel ABI Ch. 14 | kelvin | short | -32768 | -32767 to 32767 | 0.01 |
| brightness_temperature_12um3 | non L2P core field; brightness temperature for 12.3 um channel ABI Ch. 15 | kelvin | short | -32768 | -32767 to 32767 | 0.01 |
| dt_analysis | Deviation from reference SST, i.e., dt_analysis = SST - reference SST | kelvin | byte | -128 | -127 to 127 | 0.1 |
| geostationary | geostationary | N/A | int | N/A | N/A | 1 |
| l2p_flags | L2P common flags in bits 1-6 and data provider flags (from ACSPO mask) in bits 9-16: bit01 (0=IR: 1=microwave); bit02 (0=ocean; 1=land); bit03 (0=no ice; 1=ice); bits04-07 (reserved,set to 0); bit08 (0=anti-solar; 1=solar); bit09 (0=radiance valid; 1=invalid); bit10 (0=night; 1=day); bit11 (0=ocean; 1=land); bit12 (0=good quality data; 1=degraded quality data due to "twilight" region); bit13 (0=no glint; 1=glint); bit14 (0=no snow/ice; 1=snow/ice); bits15-16 (00=clear; 01=probably clear; 10=cloudy; 11=clear-sky mask undefined) | N/A | short | N/A | -32768 to 32767 | 1 |
| ni | x coordinate of projection | radians | float | N/A | -0.15184398 to 0.15184401 | 1 |
| nj | y coordinate of projection | radians | float | N/A | -0.15184401 to 0.15184398 | 1 |
| quality_level | SST quality levels: 5 corresponds to "clear-sky" pixels and is recommended for operational applications and validation. | N/A | byte | -128 | 0 to 5 | 1 |
| satellite_zenith_angle | satellite zenith angle | degrees | byte | -128 | -90 to 90 | 1 |
| sea_ice_fraction | Fractional sea ice cover from reference SST | 1 | byte | -128 | 0 to 100 | 0.01 |
| sea_surface_temperature | SST obtained by collation algorithm | kelvin | short | -32768 | -32767 to 32767 | 0.01 |
| sses_bias | Bias is derived against Piecewise Regression SST produced by local regressions with buoys. Subtracting sses_bias from sea_surface_temperature producess more accurate SST at the depth of buoys Further information at (Petrenko et al., JTECH, 2016; doi:10.1175/JTECH-D-15-0166.1) | kelvin | byte | -128 | -127 to 127 | 0.016 |
| sses_standard_deviation | Standard deviation of sea_surface_temperature from SST measured by drifting buoys. Further information at (Petrenko et al., JTECH, 2016; doi:10.1175/JTECH-D-15-0166.1) | kelvin | byte | -128 | -127 to 127 | 0.01 |
| sst_dtime | time plus sst_dtime gives seconds since 1981-01-01 00:00:00 UTC | seconds | short | -32768 | -32767 to 32767 | 0.25 |
| time | Seconds since 1981-01-01 00:00:00 | seconds since 1981-01-01 00:00:00 | int | N/A | N/A | 1 |
| wind_speed | Typically represents surface winds (10 meters above the sea surface) | m s-1 | byte | -128 | -127 to 127 | 0.15 |