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The AVHRR FRAC SST data are produced from AVHRR/3s onboard Metop-A, -B and -C satellites using the NOAA Advanced Clear-Sky Processor for Ocean (ACSPO) v2.70 enterprise system, described in (Ignatov et al., 2016). Currently, near-real time (NRT) L2P and  0.02° L3U (gridded uncollated) data for Metop-A and -B only are operationally produced by OSPO (with a ~3hrs latency), and corresponding data for Metop-C is produced at STAR (with a ~5hrs latency). The data are not archived (at either PO.DAAC or NCEI), and only available at this Coast watch page as a 2 weeks rotated buffer. It is also planned to reprocess all FRAC data in STAR, back to 2006, and create ACSPO AVHRR FRAC SST RAN1.

The data are reported in 10min granule files in GHRSST Data Specifications v2 (GDS2) format, in swath projection (L2P) and 0.02° gridded L3U (U=uncollated), 144 granules per day, with a total data volume of 8GB/day for L2P and 0.4GB/day for L3U, respectively.

ACSPO retrievals are made in full AVHRR swath (~2,800 km). For data assimilation applications (such as production of L4 analyses, especially those that blend satellite and in situ data), correction for the Sensor-Specific Error Statistics (SSES; reported in ACSPO files; Petrenko et al., 2016) biases is strongly recommended.

In each valid water pixel (defined as ocean, sea, lake or river, up to 5km inland; note that in "invalid" pixels, defined as those with >5km inland, fill values are reported), the following layers are reported in both L2P and L3U: SSTs derived using multi-channel SST (MCSST; night) and Non-Linear SST (NLSST; day) algorithms (Petrenko et al., 2014); ACSPO clear-sky mask (ACSM; provided in each pixel as part of l2p_flags; Petrenko et al., 2010); SSES bias and standard deviation (Petrenko et al., 2016); NCEP wind speed; and ACSPO SST minus reference (Canadian Met Centre L4 SST). For L2P, brightness temperatures (BTs) in 3.7, 11, and 12 µm bands are also reported, for those users interested in direct "radiance assimilation" (e.g., NOAA NCEP, NASA GMAO).

Only ACSM "confidently clear" pixels (equivalent to GDS2 "quality level"=5; also reported for each pixel) should be used. The ACSM also provides day/night, land, ice, twilight, and glint flags. Note that users of ACSPO data have the flexibility to ignore the ACSM, derive their own clear-sky mask, and use BTs and SSTs in those pixels. They may also ignore ACSPO SST, and derive their own SSTs from the original BTs.

Both L2P and L3U SSTs are monitored and validated against in situ data iQuam (Xu and Ignatov, 2014) in SQUAM (Dash et al., 2010) and ARMS (Ding et al., 2017) systems, and BTs are monitored in MICROS (Liang and Ignatov, 2011).

KeyDescription
Platform/Sensor

MetOp-A, -B and -C / AVHRR-3

Measurement/Products

Measurement Oceans > Sea Surface Temperature > subskin SST

DOI

n/a

Short Name

ACSPO_AVHRR_FRAC_NRT_L2P and ACSPO_AVHRR_FRAC_NRT_L3U

Sample Filename

L2P: 20190809200000-OSPO-L2P_GHRSST-SSTsubskin-AVHRRF_MA-ACSPO_V2.70-v02.0-fv01.0.nc
L3U: 20190809200000-OSPO-L3U_GHRSST-SSTsubskin-AVHRRF_MA-ACSPO_V2.70-v02.0-fv01.0.nc

Dataset Type

Open

Processing Level

L2P and L3U

Spatial Coverage

Global
180W-180E
90N-90S

Temporal Coverage

2-week rotated

Latency

L2P: 3 hours
L3U: 3 hours

Resolution

L2P: 1km @Nadir; ~6km @swath edge
L3U: 0.02°

Projection

L2P: Satellite native swath (WGS84)
L3U: Equal-grid 0.02°

Swath Width

~2,800 km

Sample Frequency

6 scan lines per 1 second

Temporal Repeat

Twice Daily

Orbital Period

101 Minutes

Orbit

Sun-synchronous mid-AM stable @9:30am/pm

Data Provider

Creator: NOAA STAR
Release Place: College Park, MD, USA
Release Date: 2017-Aug-30

Formats

NetCDF (GDS2)

Keywords

NOAA, AVHRR, FRAC, ACSPO, SST, NRT,  L2P, L3U

Keywords (Beta)
Documentation: 

Dash, P., A. Ignatov, Y. Kihai & J. Sapper, 2010: The SST Quality Monitor (SQUAM). JTech, 27, 1899-1917, doi:10.1175/2010JTECHO756.1♦, www.star.nesdis.noaa.gov/sod/sst/squam/

Ding, Y., A. Ignatov, I. Gladkova, M. Crosberg, and C. Chu, 2017: ACSPO Regional Monitor for SST (ARMS). BoM - NOAA SST Workshop, 18-21 April 2017, Melbourne, Australia (presentation), www.star.nesdis.noaa.gov/sod/sst/arms/

Liang, X. & A. Ignatov, 2011: Monitoring of IR Clear-sky Radiances over Oceans for SST (MICROS). JTech, 28, 1228-1242, doi:10.1175/JTECH-D-10-05023.1♦, www.star.nesdis.noaa.gov/sod/sst/micros/

Xu, F. & A. Ignatov, 2014: In situ SST Quality Monitor (iQuam). JTech, 31, 164-180, doi:10.1175/JTECH-D-13-00121.1♦, www.star.nesdis.noaa.gov/sod/sst/iquam/

Petrenko, B., A. Ignatov, Y. Kihai, P. Dash, 2016: Sensor-Specific Error Statistics for SST in the Advanced Clear-Sky Processor for Oceans. JTech, 33, 345-359, doi:10.1175/JTECH-D-15-0166.1

Petrenko, B., A. Ignatov, Y. Kihai, J. Stroup, P. Dash, 2014: Evaluation and Selection of SST Regression Algorithms for JPSS VIIRS. JGR, 119, 4580-4599, doi:10.1002/2013JD020637

Petrenko, B., A. Ignatov, Y. Kihai, and A. Heidinger, 2010: Clear-Sky Mask for ACSPO. JTech, 27, 1609-1623, doi:10.1175/2010JTECHA1413.1

(♦ - non-government website)

Data Citation: 
  • The ACSPO AVHRR FRAC data are provided by NOAA STAR. We strongly recommend contacting NOAA SST team led by A. Ignatov before the data are used for any publication or presentation.