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A multi-decade record of high-quality fCO2 data in version 3 of the Surface Ocean CO2 Atlas (SOCAT)
Bakker, D.C.E.; van Heuven, S.M.A.C. (2016). A multi-decade record of high-quality fCO2 data in version 3 of the Surface Ocean CO2 Atlas (SOCAT). ESSD 8(2): 383-413. dx.doi.org/10.5194/essd-8-383-2016
In: Earth System Science Data. Copernicus: Göttingen. ISSN 1866-3508, meer
Peer reviewed article  

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  • Bakker, D.C.E.
  • van Heuven, S.M.A.C., meer

Abstract
    The Surface Ocean CO2 Atlas (SOCAT) is a synthesis of quality-controlled fCO2 (fugacity of carbondioxide) values for the global surface oceans and coastal seas with regular updates. Version 3 of SOCAThas 14.7 million fCO2 values from 3646 data sets covering the years 1957 to 2014. This latest version has anadditional 4.6 million fCO2 values relative to version 2 and extends the record from 2011 to 2014. Version3 also significantly increases the data availability for 2005 to 2013. SOCAT has an average of approximately1.2 million surface water fCO2 values per year for the years 2006 to 2012. Quality and documentation ofthe data has improved. A new feature is the data set quality control (QC) flag of E for data from alternativesensors and platforms. The accuracy of surface water fCO2 has been defined for all data set QC flags. Automatedrange checking has been carried out for all data sets during their upload into SOCAT. The upgrade ofthe interactive Data Set Viewer (previously known as the Cruise Data Viewer) allows better interrogation of theSOCAT data collection and rapid creation of high-quality figures for scientific presentations. Automated dataupload has been launched for version 4 and will enable more frequent SOCAT releases in the future. Highprofilescientific applications of SOCAT include quantification of the ocean sink for atmospheric carbon dioxideand its long-term variation, detection of ocean acidification, as well as evaluation of coupled-climate andocean-only biogeochemical models. Users of SOCAT data products are urged to acknowledge the contributionof data providers, as stated in the SOCAT Fair Data Use Statement. This ESSD (Earth System ScienceData) “living data” publication documents the methods and data sets used for the assembly of this new versionof the SOCAT data collection and compares these with those used for earlier versions of the data collection(Pfeil et al., 2013; Sabine et al., 2013; Bakker et al., 2014). Individual data set files, included in the synthesisproduct, can be downloaded here: doi:10.1594/PANGAEA.849770. The gridded products are available here:doi:10.3334/CDIAC/OTG.SOCAT_V3_GRID.

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