Earth System Science Data www.earth-syst-sci-data.net 1866-3508 1866-3516 2 1 2010 10.5194/essd-2-79-2010 http://www.earth-syst-sci-data.net/2/79/2010/ http://www.earth-syst-sci-data.net/2/79/2010/essd-2-79-2010.html http://www.earth-syst-sci-data.net/2/79/2010/essd-2-79-2010.pdf 79 97 2010-02-15 Nordic Seas and Arctic Ocean CFC data in CARINA E. Jeansson emil.jeansson@uni.no K. A. Olsson T. Tanhua J. L. Bullister Bjerknes Centre for Climate Research, Uni Research, Bergen, Norway Department of Chemistry, University of Gothenburg, Göteborg, Sweden Leibniz-Institut für Meereswissenshaften, Marine Biogeochemie, Kiel, Germany Pacific Marine Environmental Laboratory, NOAA, Seattle, Washington, USA present address: Volvo Technology Corporation, Environment & Chemistry, Gothenburg, Sweden Water column data of carbon and carbon relevant hydrographic and hydrochemical parameters have been retrieved from a large number of cruises and collected into a new database called CARINA (CARbon IN the Atlantic). These data have been merged into three sets of files, one for each of the three CARINA regions; the Arctic Mediterranean Seas (AMS), the Atlantic (ATL) and the Southern Ocean (SO). The first part of the CARINA database consists of three files, one for each CARINA region, containing the original, non-adjusted cruise data sets, including data quality flags for each measurement. These data have then been subject to rigorous quality control (QC) in order to ensure highest possible quality and consistency. The data for most of the parameters included were examined in order to quantify systematic biases in the reported values, i.e. secondary quality control. Significant biases have been corrected for in the second part of the CARINA data product. This consists of three files, one for each CARINA region, which contain adjustments to the original data values based on recommendations from the CARINA QC procedures, along with calculated and interpolated values for some missing parameters. <br><br> Here we present an overview of the QC of the CFC data for the AMS region, including the chlorofluorocarbons CFC-11, CFC-12 and CFC-113, as well as carbon tetrachloride (CCl₄). The Arctic Mediterranean Seas is comprised of the Arctic Ocean and the Nordic Seas, and the quality control was carried out separately in these two areas. 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