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Description

The ACSPO G19/ABI L3C (Level 3 Collated) product is a gridded version of the ACSPO G19/ABI L2P product available at https://podaac.jpl.nasa.gov/dataset/ABI_G19-STAR-L2P-v3.0. The L3C output files are 1hr granules in netCDF4 format, compliant with the GHRSST Data Specification version 2 (GDS2). There are 24 granules per 24hr interval, with a total data volume of 0.2GB/day. Fill values are reported at 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), NCEP wind speed, and ACSPO SST minus reference (Canadian Met Centre 0.1deg L4 SST; available at https://podaac.jpl.nasa.gov/dataset/CMC0.1deg-CMC-L4-GLOB-v3.0). All valid SSTs in L3C are recommended for 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 VIIRS L3U product is monitored and validated against iQuam in situ data (Xu and Ignatov, 2014) in SQUAM (Dash et al, 2010).

Version Description

Version 3.0 of the NOAA ACPSO processing system

Product Summary

Platforms
GOES-19
Instruments
ABI
Spatial Extent

N: 81 S: -81 E: 6 W: -156

Spatial Resolution
0.02 Decimal Degrees x 0.02 Decimal Degrees
Location
ATLANTIC OCEAN
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2026-01-03
Temporal Resolution
1 Hour
Data Partner
Physical Oceanography Distributed Active Archive Center, Jet Propulsion Laboratory, NASA (NASA/JPL/PODAAC) ,
Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce (DOC/NOAA/NESDIS/STAR)
Concept ID
C4155452419-POCLOUD
Data State
ACTIVE
Number of Files/Granules
373
Processing Level
3
Published
Science Keywords
Sea Surface Temperature

Documents

Variables

The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.

For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor Offset
crs coordinate reference system N/A int N/A N/A 1 N/A
dt_analysis Deviation from reference SST, i.e., dt_analysis = SST - reference SST kelvin short -32768 -32767 to 32767 0.01 N/A
l2p_flags L2P common flags in bits 1-5 and data provider flags (from ACSPO mask) in bits 8-16. For backwards compatibility with legacy reader software, the data provider flags (last 8 bits) contain redundant land and ice information that is also available in bits 2 and 3, respectively. Note that lake and river information is not included in this dataset (bits 4 and 5 are always set to zero). Description of individual bits: bit01 (0=IR: 1=microwave); bit02 (0=not_land; 1=land (from land-sea mask)); bit03 (0=not_ice; 1=ice (from first-guess L4 SST)); bit04 (0=not_lake; 1=lake); bit05 (0=not_river; 1=river); bits06-07 (reserved,set to 0); bit08 (0=anti-solar; 1=solar); bit09 (0=valid_radiance; 1=invalid_radiance) bit10 (0=nighttime; 1=daytime); bit11 (0=not_land; 1=land (identical to bit02)); bit12 (0=good quality data; 1=twilight_degradation (degraded quality data due to "twilight" region)); bit13 (0=not_sunglint; 1=sunglint); bit14 (0=not_ice; 1=ice (identical to bit03)); bit15 (0=sst; 1=SST_not_valid_or_degraded); bit16 (0=water (ocean, lake, river); 1=not_water (land, ice, invalid)) N/A short N/A -32768 to 32767 1 N/A
lat geographical coordinates, WGS84 projection degrees_north float N/A -90 to 90 1 N/A
lon geographical coordinates, WGS84 projection degrees_east float N/A -180 to 180 1 N/A
or_number_of_pixels Original number of pixels from the L2Ps contributing to the SST value 1 short -32768 0 to 32767 1 N/A
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 N/A
satellite_zenith_angle The satellite zenith angle at the time of the SST observations. angular_degree short -32768 0 to 7000 0.01 N/A
sea_surface_temperature SST obtained by regression with buoy measurements without adjustment for cold-skin bias. Sensitive to skin SST. kelvin short -32768 -200 to 10000 0.01 273.15
sses_bias Subtracting sses_bias from sea_surface_temperature producess more accurate SST at the depth of buoys kelvin byte -128 -127 to 127 0.016 N/A
sses_standard_deviation Standard deviation of sea_surface_temperature from SST measured by drifting buoys kelvin byte -128 -100 to 127 0.01 1
sst_dtime time plus sst_dtime gives seconds since 1981-01-01 00:00:00 UTC seconds int -2147483648 -2147483647 to 2147483647 1 N/A
sst_front_position Binary indicator of SST front position in the valid SST clear-sky domain: 1 - SST front present, 0 - no front present N/A byte -128 0 to 1 1 N/A
sst_gradient_magnitude SST gradient magnitude is provided in pixels with SST front present (sst_front_position=1). Contains fill values elswhere. kelvin/km short -32768 -32767 to 32767 0.001 N/A
time Seconds since 1981-01-01 00:00:00 seconds since 1981-01-01 00:00:00 int N/A N/A 1 N/A
wind_speed Wind speeds represent winds at 10 metres above the sea surface. Wind values are bilinearly interplated in space and linearly interpolated in time using the closest available past and present analysis times. m s-1 byte -128 -127 to 127 0.2 25.4
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