Short Name:
AVHRRF_MA-STAR-L3U-v2.80

GHRSST NOAA/STAR Metop-A AVHRR FRAC ACSPO v2.80 0.02 L3U Dataset (GDS v2)

The ACSPO Metop-A AVHRR FRAC L3U (Level 3 Uncollated) product is a gridded (equal-grid 0.02-deg projection, approximately equivalent to 2km global resolution, fully consistent across all ACSPO products; Ignatov et al, 2017) version of the ACSPO MetOp-A FRAC L2P product available at https://podaac.jpl.nasa.gov/dataset/AVHRRF_MA-STAR-L2P-v2.80 The L3U files are 10min granules in NetCDF4 format, compliant with the GHRSST Data Specification version 2 (GDS2). There are 144 granules per 24hr interval, with a total data volume of 0.45GB/day. Fill values are reported in all invalid pixels, including pixels with >5 km inland. For each valid water pixel (defined as ocean, sea, lake or river, and up to 5 km inland), the following layers are reported: SSTs, ACSPO clear-sky mask (ACSM; provided in each grid as part of l2p_flags, which also includes day/night, land, ice, twilight, and glint flags), wind speed, and ACSPO minus reference CMC L4 SST. Only L2P SSTs with QL=5 were gridded, so all valid SSTs are recommended for the users. Per GDS2 specifications, two additional Sensor-Specific Error Statistics layers (SSES bias and standard deviation) are reported in each pixel with valid SST. The ACSPO Metop-A AVHRR FRAC L3U product is monitored and validated against iQuam in situ data (Xu and Ignatov, 2014) in SQUAM (Dash et al, 2010). SST imagery and clear-sky mask are evaluated in the NOAA ACSPO Regional Monitor for SST (ARMS) system, and checked for consistency with L2P and other satellites/sensors SST products. More information about the dataset is found at AVHRRF_MA-STAR-L2P-v2.80 and in (Pryamitsyn et al, 2021).The ACSPO AVHRR FRAC L3U product is monitored and validated against quality controlled in situ data, provided by the NOAA in situ SST Quality Monitor system (iQuam; Xu and Ignatov, 2014), in another NOAA system, SST Quality Monitor (SQUAM; Dash et al, 2010). SST imagery and clear-sky masking are continuously evaluated, and checked for consistency with other sensors and platforms, in the ACSPO Regional Monitor for SST (ARMS) system. The full size (2.6GB/day) ACSPO L2P product, in original swath projection (1.1km/nadir to 6km/swath edge), also organized in 144 10-min granules/day, is available at https://podaac.jpl.nasa.gov/dataset/AVHRRF_MA-STAR-L2P-v2.80

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