Earth System Science Data Discussions www.earth-syst-sci-data-discuss.net 1866-3591 2 1 2009 10.5194/essdd-2-181-2009 http://www.earth-syst-sci-data-discuss.net/2/181/2009/ http://www.earth-syst-sci-data-discuss.net/2/181/2009/essdd-2-181-2009.html http://www.earth-syst-sci-data-discuss.net/2/181/2009/essdd-2-181-2009.pdf 181 203 2009-08-05 Nordic Seas total dissolved inorganic carbon data in CARINA A. Olsen are.olsen@gfi.uib.no Bjerknes Centre for Climate Research, UNIFOB AS, Allegaten 55, 5007 Bergen, Norway Department of Chemistry, University of Gothenburg, 41296, Göteborg, Sweden Water column data of carbon and carbon relevant hydrographic and hydrochemical parameters from 188 previously non-publicly available cruises in the Arctic, Atlantic, and Southern Ocean have been retrieved and merged into a new database: CARINA (CARbon IN the Atlantic). The data have 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 data products, i.e. the three merged files with measured, calculated and interpolated values for each of the three CARINA regions; the Arctic Mediterranean Seas (AMS), the Atlantic (ATL) and the Southern Ocean (SO). With the adjustments the CARINA database is consistent both internally as well as with GLODAP (Key et al., 2004) and is suitable for accurate assessments of, for example, oceanic carbon inventories and uptake rates and for model validation. The Arctic Mediterranean Seas includes the Arctic Ocean and the Nordic Seas, and the quality control was carried out separately in these two areas. This contribution presents an account of the quality control of the total dissolved inorganic carbon (TCO₂) data from the Nordic Seas in CARINA. Out of the 35 cruises from the Nordic Seas included in CARINA, 25 had TCO₂ data. The data from 7 of these were found to be of low quality and should not be used, thus the final CARINA data product contains TCO₂ data from 18 cruises from the Nordic Seas. These data appear consistent to at least 4 μmol kg^−1. Blindheim, J. and Østerhus, S.: The Nordic Seas, main oceanographic features, in: The Nordic Seas: an integrated perspective, edited by: Drange, H., Dokken, T., Furevik, T., Gerdes, R., and Berger, W., AGU Geophysical monograph 158, AGU Washington DC, 2005. Chen, A., Jones, E. P., and Lin, K.: Wintertime total carbon dioxide measurements in the Norwegian and Greenland Seas, Deep-Sea Res., 37, 1455–1473, 1990. Chierici, M., Drange, H., Anderson, L. G., and Johannessen, T.: Inorganic carbon fluxes through the boundaries of the Greenland Sea Basin based on in situ observations and water transport estimates, J. Mar. Sys., 22, 295–309. Dickson, A. G., Sabine, C. L., and Christian, J. R. 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Olafsson, J. and Olsen, A.: Nordic Seas nutrients data in CARINA, Earth Syst. Sci. Data, in preparation, 2009. Olsen, A., Key, R. M., Jeansson, E., Falck, E., Olafsson, J., van Heuven, S., Skjelvan, I., Omar, A. M., Olsson, K. A., Anderson, L. G., Jutterström, S., Rey, F., Johannessen, T., Bellerby, R. G. J., Blindheim, J., Bullister, J. L., Pfeil, B., Lin, X., Kozyr, A., Schirnick, C., Tanhua, T., and Wallace, D. W. R.: Overview of the Nordic Seas CARINA data and salinity measurements, Earth Syst. Sci. Data Discuss., 2, 1–25, 2009a. Olsen, A.: Nordic Seas total alkalinity data in CARINA, Earth Syst. Sci. Data, in preparation, 2009b. Olsen, A., Omar, A. M., Bellerby, R. G. J., Johannessen, T., Ninnemann, U., Brown, K. R., Olsson, K. A., Olafsson, J., Nondal, G., Kivimäe, C., Kringstad, S., Neill, C., and Olafsdottir, S.: Magnitude and origin of the anthropogenic CO₂ increase and $^13$C Suess effect in the Nordic seas since 1981, Global Biogeochem. 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