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NOAA Advanced Clear-Sky Processor for Ocean (ACSPO): sea surface temperature, clear sky radiances, and aerosol optical depth for the global ocean, 2011 - present (NCEI Accession 0072979)


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            title:  NOAA Advanced Clear-Sky Processor for Ocean (ACSPO): sea surface temperature, clear sky radiances, and aerosol optical depth for the global ocean, 2011 - present (NCEI Accession 0072979)
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        abstract:  Advanced Clear Sky Processor for Ocean (ACSPO) is the NOAA Enterprise Sea Surface Temperature (SST) system. It is currently used to produce a consistent line of SST products from several VIIRS, AVHRR FRAC and GAC, MODIS, ABI, and AHI sensors, flown onboard polar (SNPP/NOAA-20, Metop-A/B, NOAA-16 to 19, Terra/Aqua) and geostationary (GOES-16, Himawari-8) satellites. Two products are produced from each platform/sensors, in a community-consensus Group for High-Resolution Sea Surface Temperature (GHRSST) Data Specification version 2 (GDS2) NetCDF format: L2P (in original swath projection) and L3U (gridded uncollated 0.02deg resolution). Two-week rotated buffers of each ACSPO product are available in Near-Real Time (NRT) via the NOAA Coast Watch site, along with two reprocessed (Reanalyses, or RAN1) products: from SNPP VIIRS (Mar 2012 - 15 Dec 2015) and from AVHRR GAC onboard multiple NOAA and Metop satellites (Aug 2002 - present).
        purpose:  The purpose of the AVHRR Clear-Sky Processor over Oceans is to produce clear-sky products over oceans from the Advanced Very High Resolution Radiometer (AVHRR) for the designated user community.
        credit:  NOAA STAR and NOAA OSDPD
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                            description:  Global Change Master Directory (GCMD). 2023. GCMD Keywords, Version 17. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords
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              Anchor:  https://gcmd.earthdata.nasa.gov/kms/concept/3d4e44c4-5d99-4a9b-8388-43c63533ee97 GEOGRAPHIC REGION > GLOBAL OCEAN
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                            name:  GCMD Keyword Forum Page
                            description:  Global Change Master Directory (GCMD). 2023. GCMD Keywords, Version 17. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords
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            otherConstraints:  Cite as: NOAA Center for Satellite Applications and Research (2020). NOAA Advanced Clear-Sky Processor for Ocean (ACSPO): sea surface temperature, clear sky radiances, and aerosol optical depth for the global ocean, 2011 - present (NCEI Accession 0072979). [indicate subset used]. NOAA National Centers for Environmental Information. Dataset. https://www.ncei.noaa.gov/archive/accession/0072979. Accessed [date].
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            useLimitation:  Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
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            otherConstraints:  Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
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                title:  NOAA Advanced Clear-Sky Processor for Ocean (ACSPO): sea surface temperature, clear sky radiances, and aerosol optical depth for the global ocean, 2011 - present
                date:  (CI_Date)
                    date:  2011-07-01
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                        title:  NOAA National Centers for Environmental Information
                        date: (inapplicable)
                    code:  gov.noaa.nodc:NOAA-ACSPO-SST
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                            linkage: https://www.ncei.noaa.gov/archive/accession/NOAA-ACSPO-SST
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                title:  Advanced Clear Sky Processor for Ocean (ACSPO)
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                    date:  2018-05-07
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                            linkage: https://www.star.nesdis.noaa.gov/portfolio/detail_ACSPO.php
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                      Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/1223 US DOC; NOAA; NESDIS; Center for Satellite Applications and Research (STAR)
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                title:  AVHRR Clear-Sky Processor for Oceans (ACSPO) Interface Control Document
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                    date:  2008-03-28
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                edition:  Version 1.0
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                      Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/1223 US DOC; NOAA; NESDIS; Center for Satellite Applications and Research (STAR)
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                title:  Implementation of the Community Radiative Transfer Model in Advanced Clear-Sky Processor for Oceans and validation against nighttime AVHRR radiances
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                    date:  2009-03-27
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                    code: https://doi.org/10.1029/2008jd010960
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                    individualName:  Liang, Xing-Ming
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                    individualName:  Ignatov, Alexander
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                    individualName:  Kihai, Yury
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                    name:  J. Geophys. Res.
                    issueIdentification:  114:D6
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          LanguageCode:  eng; USA
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        topicCategory:  (MD_TopicCategoryCode) oceans
        topicCategory:  (MD_TopicCategoryCode) climatologyMeteorologyAtmosphere
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                    beginPosition:  2011-07-01
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        supplementalInformation:  SST is used in many applications including monitoring of climate variability, operational weather and seasonal forecasting, military and defense operations, validation and/or forcing of the ocean and atmospheric models, ecosystem assessment, tourism, and fisheries. Satellite SST retrievals are assimilated into climate, mesoscale atmospheric, and sea surface numerical models, which form the cornerstone of the operational ocean forecasting systems. The quality and accuracy of ACSPO products is monitored in near-real time by the following systems: SST Quality Monitor (SQUAM), In situ SST Quality Monitor (iQuam), ACSPO Regional Monitor for SST (ARMS), and Monitoring of IR Clear-sky Radiances over Ocean for SST (MICROS 2).
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                  Anchor:  https://www.ncei.noaa.gov/archive/archive-management-system/OAS/bin/prd/jquery/institution/details/1730 NOAA National Centers for Environmental Information
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                        electronicMailAddress:  NCEI.Info@noaa.gov
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                fees:  In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
                orderingInstructions:  Contact NCEI for other distribution options and instructions.
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                    description:  These data are available through NOAA's Comprehensive Large Array-data Stewardship System (CLASS). Use the CLASS web interface to search for and order data by temporal, spatial and and other product-specific criteria. You may also create a subscription to order data on a regular basis.
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                    linkage: https://www.ncei.noaa.gov/archive/accession/0072979
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                    linkage: https://www.ncei.noaa.gov/archive/accession/oas/72979
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                    linkage: https://www.ncei.noaa.gov/archive/accession/download/72979
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                    linkage: ftp://ftp-oceans.ncei.noaa.gov/nodc/archive/arc0153/0072979/
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                description:  NCEI Accession 0072979 v1.1 was published.
                dateTime:
                  DateTime:  2020-04-23T20:26:32Z
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                    sourceCitation:  (CI_Citation)
                        title:  NCEI Accession 0072979 v1.1
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                                    linkage: https://www.ncei.noaa.gov/archive/accession/0072979/1.1
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                                    name:  NCEI Accession 0072979 v1.1
                                    description:  published 2020-04-23T20:26:32Z
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    dataQualityInfo:  (DQ_DataQuality)
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            nameOfMeasure:  FGDC Attribute Accuracy Report
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                  Record:  The following are estimates of global accuracies and precision of the ACSPO products: 1) Clear-Sky Brightness Temperatures in AVHRR bands: Channel 3B Bias ~+0.2+0.3K, RMSD ~0.5K; Channel 4 Bias ~+0.5K, RMSD ~0.55K; Channel 5 Bias ~+0.5K, RMSD ~0.65K. 2) SST: Night Bias ~0.3K, RMSD ~0.5K; Day Bias ~0K, RMSD ~0.6K. 3) AOD: TBD. Each pixel has error/quality information.
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            nameOfMeasure:  FGDC Logical Consistency Report
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                valueUnit: (inapplicable)
                value:
                  Record:  Three web pages have been set up to monitor the quality and accuracy of ACSPO products, in near-real time: 1) The MICROS (Monitoring of Infrared Clear-sky Radiances over Oceans for SST, http://www.star.nesdis.noaa.gov/sod/sst/micros/) monitors accuracy of CSRs by comparing with those simulated using the Community Radiative Transfer Model (CRTM) with Reynolds SST and NCEP/GFS upper air fields as input. 2) The SQUAM (SST Quality Monitor, http://www.star.nesdis.noaa.gov/sod/sst/squam/index.html) monitors long-term stability, and cross-platform consistency of the ACSPO SST product by comparing it with the global reference fields such as Reynolds SST, OSTIA, RTG, and ODYSSEA. It also monitors accuracy and precision of ACSPO SST with respect to the global in situ SSTs measured by drifting and moored buoys.
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                  Record:  The ACSPO product is complete and contains data of higher density and equal or better accuracy than the NESDIS heritage product. ACSPO continues to be developed and this will be reflected in the new versions annotated in the files names being archived. The missing data flag for all parameters is NaN.
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                description:  The application is data-driven from all AVHRR GAC and FRAC Level 1b data. HRPT and LAC data are also processed. The ACSPO Orbital Processor (OP) computes albedos and brightness temperatures at all pixels from calibration coefficients. A cloud detection algorithm determines clear pixels. Regression sea surface temperature and single-channel aerosol optical depth are computed at all pixels that are determined, using a land mask, to be over water. The clear-sky mask available in ACSPO is provided to identify clear-sky pixels, which define the domain of the ACSPO products. The ACSPO OP simulates clear-sky brightness temperatures (BT) with the Community Radiative Transfer Model (CRTM). These parameters are calculated on the NCEP 1 degree grid using NCEP GFS and Reynolds 1 degree weekly (v2) SST, and then bilinearly interpolated to every AVHRR pixel. These are currently used to improve the clear-sky mask in ACSPO and to perform quality control of AVHRR clear-sky radiances over ocean. In the near future, physical SST retrievals will be implemented. The predecessor of the ACSPO OP is the Clouds from AVHRR Extended (CLAVR-x) software. The structure of the AVHRR algorithm file used by the ACSPO OP has been inherited from CLAVR-x. The AVHRR algorithm file contains the instrument-specific parameters in standard algorithms that have been adopted into the CLAVR-x system. The ACSPO OP algorithm file contains daytime and nighttime operational SST coefficients, but does not use ice and land coefficients inherited from CLAVR-x. To allow quick cross-evaluation of ACSPO SST against the NESDIS heritage Main Unit Task (MUT) SST product, the ACSPO OP is initially set to use the same SST coefficients as the MUT system (calculated from heritage buoy match files). GAC granules will be created hourly and FRAC granules will be created every 10 minutes.
                dateTime: (inapplicable)
                processor:  (CI_ResponsibleParty)
                    individualName:  Alexander Ignatov
                    organisationName:  DOC/NOAA/NESDIS/STAR > Center for Satellite Applications and Research, NESDIS, NOAA, U.S. Department of Commerce
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                            city:  Camp Springs
                            administrativeArea:  MD
                            postalCode:  20746-4325
                            electronicMailAddress:  Alex.Ignatov@noaa.gov
                    role:  (CI_RoleCode) principalInvestigator
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            organisationName:  NOAA National Centers for Environmental Information
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    acquisitionInformation:  (MI_AcquisitionInformation)
        instrument:  (MI_Instrument)
            identifier:  (MD_Identifier)
                code:  AVHRR-3
            type:  AVHRR-3
            description:  Advanced Very High Resolution Radiometer-3 The AVHRR-3 is a six channel scanning radiometer providing 3 solar channels in the visible-near infrared region and 3 thermal infrared channels. The AVHRR-3 has two one-micrometer wide channels between 10.3 and 12.5 micrometers. This latest version of AVHRR was first carried on NOAA-15 launched in May 1998 and subsequently in all current NOAA and MetOp platforms. Measuring the same view, this array of diverse wavelengths, after processing, permits multi spectral analysis for more precisely defining hydrologic, oceanographic, and meteorological parameters. Comparison of data from two channels is often used to observe features or measure various environmental parameters. The three channels operating entirely within the infrared band are used to detect the heat radiation from and hence, the temperature of land, water, sea surfaces, and the clouds above them. Additional Information: http://www.ncdc.noaa.gov/oa/pod-guide/ncdc/docs/klm/html/c3/sec3-1.htm
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            identifier:  (MD_Identifier)
                code:  MetOp-A
            description:  Updated information from ICES for the platform MetOp-A from GERMANY. Name MetOp-A Country(s) DE: GERMANY Platform Class 65: Orbiting satellite Commissioned Date 2006-10-19 Decommissioned Date 2016 Notes Meteorological operational satellite. 1st flight unit of the EPS programme. Main mission is operational meteorology. Command and Control of MetOp is performed from the EPS Control Room at EUMETSAT Headquarters in Darmstadt, Germany. Information Source (URL) http://www.wmo-sat.info/oscar/satellites/view/306 Confirmed by NOAA on 2018-08-08. OTHER INFORMATION: The MetOp series of satellites has been developed as part of a joint undertaking between the European Space Agency (ESA) and the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT), whereby MetOp forms the space segment of EUMETSAT's Polar System (EPS). Moreover, MetOp is the European contribution to a new cooperative venture with the American National Oceanic and Atmospheric Administration (NOAA) through the Initial Joint Polar Satellite System. MetOp-A is the first of a series of three satellites. Launched: 19 October 2006 Declared operational: 15 May 2007
            instrument:  #inst_be0f
        platform:  (MI_Platform)
            identifier:  (MD_Identifier)
                code:  MetOp-B (Meteorological Operational satellite-B)
            description:  Platform Class: 65-Orbiting satellite Synonyms: Meteorological Operational satellite-B Commissioned Date: 2012-09-17 Countries: Austria, Belgium, Bulgaria, Croatia, Czech Rep., Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Netherlands, Norway, Poland, Portugal, Romania, Slovak Republic, Slovenia, Spain, Sweden, Switzerland, Turkey, United Kingdom. Notes +: MetOp-B is the second of three ESA and EUMETSAT weather satellites. The satellite carry a set of seven 'heritage' instruments provided by NOAA and CNES and a new generation of five European instruments offering improved sensing capabilities. Several of the instruments measure similar aspects of the atmosphere, namely temperature and humidity, but use a variety of measuring techniques to acquire their data. Info Source: http://www.eumetsat.int/website/home/Satellites/CurrentSatellites/Metop/index.html http://www.esa.int/Our_Activities/Observing_the_Earth/The_Living_Planet_Programme/Meteorological_missions/MetOp/About_the_satellite https://directory.eoportal.org/web/eoportal/satellite-missions/m/metop
            instrument:  #inst_be0f
        platform:  (MI_Platform)
            identifier:  (MD_Identifier)
                code:  MetOp-C (Meteorological Operational satellite-C)
            description:  Platform Class: 65-Orbiting satellite Synonyms: Meteorological Operational satellite-C Commissioned Date: 2018-11-07 -C is the third and final satellite of the first generation of polar-orbiting meteorological operational (MetOp) satellites developed by ESA and EUMETSAT. The MetOp satellites carry an array of sensors that measure temperature, humidity, trace gases, ozone and wind speed over the ocean. They include a set of seven 'heritage' instruments provided by NOAA and CNES and a new generation of five European instruments offering improved sensing capabilities. Several of the instruments measure similar aspects of the atmosphere. Info Source: http://www.eumetsat.int/website/home/Satellites/CurrentSatellites/Metop/index.html http://www.esa.int/Our_Activities/Observing_the_Earth/The_Living_Planet_Programme/Meteorological_missions/MetOp/About_the_satellite https://directory.eoportal.org/web/eoportal/satellite-missions/m/metop
            instrument:  #inst_be0f
        platform:  (MI_Platform)
            identifier:  (MD_Identifier)
                code:  NOAA-18
            description:  Updated information from ICES for the platform NOAA-18 from United States. Name NOAA-18 Country(s) US: UNITED STATES Platform Class 65: Orbiting satellite Native Name Synonyms Call Sign MMSI IMO Pennant Title Commissioned Date 2005 Decommissioned Date 2016 Notes Polar-orbiting environmental satellite launched May 2005 as NOAA-N. The NODC has archived AVHRR SST data collected from this platform as part of the Pathfinder project. Instruments: AVHRR/3 et al Information source (URL) https://www.wmo-sat.info/oscar/satellites/view/340 Confirmed by NOAA on 2018-07-17.
            instrument:  #inst_be0f
        platform:  (MI_Platform)
            identifier:  (MD_Identifier)
                code:  NOAA-19
            description:  Updated information from ICES for the platform NOAA-15 from United States. Name NOAA-19 Country(s) US: UNITED STATES Platform Class 65: Orbiting satellite Native Name Synonyms Call Sign MMSI IMO Pennant Title Commissioned Date 2009 Decommissioned Date 2016 Notes Polar-orbiting environmental satellite launched February 2009 as NOAA-N Prime. The NODC has archived AVHRR SST data collected from this platform as part of the Group for High Resolution Sea Surface Temperature (GHRSST) Project. Additional information: Main body: 4.2m (13.75 ft) long, 1.88m (6.2 ft) diameter Solar array: 2.73m (8.96 ft) by 6.14m (20.16 ft) Weight at Liftoff: 1419.8 kg (3130 pounds) including 4.1 kg of gaseous nitrogen Launch Vehicle: Delta-II 7320-10 Space Launch Vehicle Launch Date: February 06, 2009 Vandenburg Air Force Base, CA Orbital information: Type: sun synchronous Altitude: 870 km Period: 102.14 minutes Inclination: 98.730 degrees Sensors: Advanced Very High Resolution Radiometer (AVHRR/3) Advanced Microwave Sounding Unit-A (AMSU-A) Microwave Humidity Sounder (MHS) High Resolution Infrared Radiation Sounder (HIRS/4) Solar Backscatter Ultraviolet Spectral radiometer (SBUV/2) Space Environment Monitor (SEM/2) Search and Rescue (SAR) Repeater and Processor Advance Data Collection System (ADCS) Information source (URL) https://www.wmo-sat.info/oscar/satellites/view/341 http://noaasis.noaa.gov/NOAASIS/ml/genlsatl.html Confirmed by NOAA on 2018-07-17.
            instrument:  #inst_be0f