Earth System Science Data www.earth-syst-sci-data.net 1866-3508 1866-3516 1 1 2009 10.5194/essd-1-77-2009 http://www.earth-syst-sci-data.net/1/77/2009/ http://www.earth-syst-sci-data.net/1/77/2009/essd-1-77-2009.html http://www.earth-syst-sci-data.net/1/77/2009/essd-1-77-2009.pdf 77 86 2009-12-10 Nordic Seas total alkalinity data in CARINA A. Olsen are.olsen@gfi.uib.no Bjerknes Centre for Climate Research, Uni Research, Allégaten 55, 5007 Bergen, Norway Department of Chemistry, University of Gothenburg, 41296, Göteborg, Sweden Water column data of inorganic 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. The quality control was carried out separately in each of the three CARINA regions: The Arctic Mediterranean Seas (AMS), the Atlantic (ATL), and the Southern Ocean (SO). The AMS was further split up into the Arctic Ocean and Nordic Seas during the secondary QC. The quality control of the different parameters in the different regions is described in the series of papers in this special issue of ESSD, with this contribution focusing on the Nordic Seas total alkalinity (ALK) data. 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 (AMS, SO and ATL). 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. Out of the 35 cruises from the Nordic Seas included in CARINA, 21 had ALK data. The data from 6 of these were found to be of low quality and should not be used. Of the others, 3 were found to be biased low and were subject to adjustment. Thus the final CARINA data product contains ALK data from 15 cruises from the Nordic Seas, and these data appear consistent to ±3 μmol kg−1. Anderson, L. G., Jutterström, S., Kaltin, S., Jones, E. P., and Björk, G.: Variability in river runoff distribution in the Eurasian Basin of the Arctic Ocean, J. Geophys. Res., 109, C01016, doi:10.1029/2003JC001773, 2004. 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 Geohysical 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. Dickson, A. G., Sabine, C. L., and Christian, J. R. (Eds.): Guide to best practices for ocean CO2 measurements, PICES Special Publication~3, 191~pp., 2007. Dickson, A. G.: An exact definition of total alkalinity and a procedure for the estimation of alkalinity and total inorganic carbon from titration data, Deep-Sea Res., 609–623, 1981. Falck, E. and Olsen, A.: Nordic Seas dissolved oxygen data in CARINA, Earth Syst. Sci. Data Discuss., 2, 537–553, 2009. 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. Oceanog., 48, 337–402, 2001. Haraldson, C., Anderson, L. G., Hassellöv, M., Hulth, S., and Olsson, K.: Rapid, high- precision potentiometric titration of alkalinity in ocean and sediment pore waters, Deep-Sea Res. Pt. I, 44, 2031–2044, 1997. Hoppema, M., Velo, A., van Heuven, S., Tanhua, T., Key, R. M., Lin, X., Bakker, D. C. E., Perez, F. F., Ríos, A. F., Lo Monaco, C., Sabine, C. L., \'Alvarez, M., and Bellerby, R. G. J.: Consistency of cruise data of the CARINA database in the Atlantic sector of the Southern Ocean, Earth Syst. Sci. Data, 1, 63–75, 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. 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. 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., 2, 579–624, 2009. Lo Monaco, C., \'Alvarez, M., Key, R. M., Lin, X., Tanhua, T., Tilbrook, B., Bakker, D. C. E., van Heuven, S., Hoppema, M., Metzl, N., Ríos, A. F., Sabine, C. L., and Velo, A.: Assessing the internal consistency of the CARINA database in the Indian sector of the Southern Ocean, Earth Syst. Sci. Data Discuss., 2, 367–419, 2009. Olafsson, J. and Olsen, A.: Nordic Seas nutrients data in CARINA, Earth Syst. Sci. Data Discuss., in preparation., 2009. Olsen, A.: Nordic Seas total dissolved inorganic carbon data in CARINA, Earth Syst. Sci. Data, 1, 35–43, 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, 1, 25–34, 2009. 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. Cy., 20, GB3027, doi:10.1029/2005GB002669, 2006. Sabine, C. L., Hoppema, M., Key, R. M., Tilbrook, B., van Heuven, S., Lo Monaco, C., Metzl, N., Ishii, M., Murata, A., and Musielewicz, S.: Assessing the internal consistency of the CARINA data base in the Pacific sector of the Southern Ocean, Earth Syst. Sci. Data Discuss., 2, 555–578, 2009. Seber, C. A. F.: Multivariate Observations, NJ, John Wiley & Sons, Inc., 1984. 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. Tanhua, T. and Wallace, D. W. R.: Consistency of TTO-NAS inorganic carbon data with modern measurements, Geophys. Res. Lett., 32, L14618, doi:10.1029/2005GL023248, 2005. Velo, A., Pérez, F. F., Lin, X., Key, R. M., Tanhua, T., de la Paz, M., van Heuven, S., Jutterström, S., and Ríos, A. F.: CARINA data synthesis project: pH data scale unification and cruise adjustments, Earth Syst. Sci. Data Discuss., 2, 421–475, 2009a. Velo, A., Perez, F. F., Brown, P., Tanhua, T., Schuster, U., and Key, R. M.: CARINA alkalinity data in the Atlantic Ocean, Earth Syst. Sci. Data, 1, 45–61, 2009b. Yager, P. L., Wallace, D. W. R., Johnson, K. M., Smith Jr., W. O., Minnett, P. J., and Deming, J. W.: The Northeast Water Polynya as an atmospheric CO2 sink: A seasonal rectification hypothesis, J. Geophys. Res., 100, 4389–4398, 1995.