NOAA ACSPO v2.71 GOES-17/West ABI L2P SST

GOES-17 (G17) is the 2nd satellite in the US NOAA's GOES-R series. It was launched on 1 Mar 2018, moved to its nominal West position at 137.2W in Nov 2018, and declared NOAA operational GOES-West satellite on 12 Feb 2019. The 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 with spatial resolution 2km/nadir and 10min temporal sampling. ACSPO processes every 10min 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, was not operating at its designed capacity, which required mitigations to the ACSPO algorithms and releasing an updated ACSPO v2.71 (Pennybacker et al, 2019). In particular, its 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 10min FD data are subsequently collated in time, to produce 1hr 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 two Sensor-Specific Error Statistics (bias and standard deviation) 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 available at https://www.star.nesdis.noaa.gov/pub/socd4/coastwatch/sst/nrt/abi/nav . The ACSPO G17 ABI SSTs are continuously validated in the NOAA SQUAM system https://www.star.nesdis.noaa.gov/socd/sst/squam against quality controlled iQuam in situ data https://www.star.nesdis.noaa.gov/socd/sst/iquam . Quality of SST imagery and clear-sky mask are evaluated in the NOAA ARMS system https://www.star.nesdis.noaa.gov/socd/sst/arms . 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 .