Earth System Science Data Discussions www.earth-syst-sci-data-discuss.net 1866-3591 2 1 2009 10.5194/essdd-2-537-2009 http://www.earth-syst-sci-data-discuss.net/2/537/2009/ http://www.earth-syst-sci-data-discuss.net/2/537/2009/essdd-2-537-2009.html http://www.earth-syst-sci-data-discuss.net/2/537/2009/essdd-2-537-2009.pdf 537 553 2009-10-22 Nordic Seas dissolved oxygen data in CARINA E. Falck eva.falck@gfi.uib.no A. Olsen Geophysical Institute, University of Bergen, Allégaten 70, 5007 Bergen, Norway Bjerknes Centre for Climate Research, UNIFOB AS, Allégaten 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 (Greenland, Norwegian, and Iceland Seas), and the quality control was carried out separately in these two areas. This contribution presents an account of the quality control of the dissolved oxygen data from the Nordic Seas in CARINA. Out of the 35 cruises from the Nordic Seas included in CARINA, 32 had oxygen data. The data from 4 of these were found to be biased low and were subject to adjustment. Thus the final CARINA data product contains oxygen data from 32 cruises from the Nordic Seas, and these data appear consistent to ±1% (corresponds to ±3 μmol kg^−1 in the deep water). Blindheim, J. and Rey, F.: Water-mass formation and distribution in the Nordic Seas during the 1990s, ICES J. Mar. Sci., 61, 846–863, 2004. Gouretski, V. V. and Jancke, K.: Systematic errors as the cause for an apparent deep water property variability: global analysis of the WOCE and historical hydrographic data, Prog. Oceanogr., 48, 337–402, 2001. Jeansson, E., Olsson, K. A., Tanhua, T., and Bullister, J. L.: Nordic Seas and Arctic Ocean CFC Data in CARINA, Earth Syst. Sci. Data Dicuss., in press, 2009. Johnson, G. C., Robbins, P. E., and Hufford, G. E.: Systematic adjustments of hydrographic sections for internal consistency, J. Atmos. Ocean. Tech., 18, 1234–1244, 2001. Jutterström, S., Anderson, L. G., Bates, N. R., Bellerby, R., Johannessen, T., Jones, E. P., Key, R. M., Lin, X., Olsen, A., and Omar, A. M.: Arctic Ocean data in CARINA, Earth Syst. Sci. Data Discuss., 2, 281–308, 2009. Kasajima, Y., Olsson, K. A., Johannessen, T., Messias, M.-J., Jeansson, E., Bellerby, R. G. J., and Skjelvan, I.: A submesoscale coherent eddy in the Greenland Sea in 2003, J. Geophys. Res., 111, C07013, doi:10.1029/2005JC003130, 2006. Key, R. M., Kozyr, A., Sabine, C. L., Lee, K., Wanninkhof, R., Bullister, J., Feely, R. A., Millero, F., Mordy, C., and Peng, T.-H., Results from the Global Data Analysis Project (GLODAP, Global. Biogeochem. Cy., 18, GB4031, doi:10.1029/2004GB002247, 2004. Key, R. M., Tanhua, T., Olsen, A., Hoppema, M., Jutterström, S, Schirnick, C., van Heuven, S., Kozyr, A., Lin, X., Velo., A., Wallace, D. W. R., and Mintrop, L.: The CARINA data synthesis project: introduction and overview, Earth Syst. Sci. Data Discuss., submitted, 2009. Jeansson, E., Olsson, K. A., Tanhua, T., and Bullister, J. L.: Nordic Seas and Arctic Ocean CFC data in CARINA, Earth Syst. Sci. Data Discuss., 2, 493–536, 2009. Olsen, A.: Nordic Seas total dissolved inorganic carbon data in CARINA, Earth Syst. Sci. Data Discuss., 2, 181–203, 2009a. Olsen, A.: Nordic Seas total alkalinity data in CARINA, Earth Syst. Sci. Data Discuss., 2, 309–330, 2009b. 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, 2009. Tanhua, T., Steinfeldt, R., Key, R. M., Brown, P., Gruber, N., Wanninkhof, R., Perez, F., Körtzinger, A., Velo, A., Schuster, U., van Heuven, S., Bullister, J. L., Stendardo, I., Hoppema, M., Olsen, A., Kozyr, A., Pierrot, D., Schirnick, C., and Wallace, D. W. R.: Atlantic Ocean CARINA data: overview and salinity adjustments, Earth Syst. Sci. Data Discuss., 2, 241–280, 2009a. Tanhua, T., van Heuven, S., Key, R. M., Velo, A., Olsen, A., and Schirnick, C.: Quality control procedures and methods of the CARINA database, Earth Syst. Sci. Data Discuss., 2, 205–240, 2009b. Stendardo, I., Gruber, N., and Körtzinger, A.: CARINA-Oxygen: a new high-quality oxygen database for the Atlantic Ocean, Earth Syst. Sci. Data Discuss., 2, 103–135, 2009.