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These data were collected by Eric Achterberg, Mario Esposito, Matthew P. Humphreys, and Susan E. Hartman of National Oceanography Centre, Southampton (NOCS) as part of the EEL_2011_D365 dataset. CDIAC associated the following cruise ID(s) with this dataset: EEL_2011_D365</gco:CharacterString>
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                <gco:CharacterString>Ocean Acidification Search Keywords</gco:CharacterString>
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                <gco:CharacterString>Parameter or Variable: Dissolved Inorganic Carbon;
Abbreviation: DIC;
Observation type: discrete;
In-situ / Manipulation / Response variable: in-situ observation;
Measured or calculated: Calculated;
Replicate information: Repeated measurements on the same batch of seawater (n&gt;=3) in the lab gave consistent results (precision for the whole dataset estimated as 2.9 μmol kg-1).;
Standardization description: In order to standardize the results, Certified Reference Materials (CRM) from A.G. Dickson, Scripps Institution of Oceanography were analysed as standards to calibrate the instrument at the beginning and end of each day of analysis. A daily correction factor was applied to all measured values according to Millero et al. (1998).;
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                <gco:CharacterString>Parameter or Variable: Total alkalinity;
Abbreviation: TA;
Observation type: discrete;
In-situ / Manipulation / Response variable: in-situ observation;
Measured or calculated: Measured;
Type of titration: Titration with HCl (~0.10 mol/L) uses a closed cell procedure with an open cell, with a pH half cell electrode (glass bodied Orion 8101SC, Ross, USA) and an Ag/AgCl reference electrode (model 6.0729.100, Metrohm, Switzerland).;
Cell type (open or closed): open cell;
Curve fitting method: non-linear curve fitting (least-squares) approach (Dickson et al., 2007);
Uncertainty: Repeated measurements on the same batch of seawater (n&gt;=3) were undertaken every day prior to sample analysis in order to assess the precision of the method. The precision was estimated for the whole dataset to be 2.9 μmol kg-1 for DIC and 4.7 μmol kg-1 for TA. The accuracy of the measurement is assured by the standardization using the CRM from A.G. Dickson, Scripps Institution of Oceanography on daily basis.;
Method reference: Dickson, A. G., C. L. Sabine, and J. R. Christian. 2007. Guide to best practices for ocean CO2 measurements. PICES Special Publication 3. 191 pp. Dumousseaud, C., E. P. Achterberg, T. Tyrrell, A. Charalampopoulou, U. Schuster, M. Hartman, and D. J. Hydes. 2010. Contrasting effects of temperature and winter mixing on the seasonal and inter-annual variability of the carbonate system in the Northeast Atlantic Ocean. Biogeosciences 7: 1481-1492. Grasshoff, K.: Determination of nutrients, in: Methods of Seawater Analysis, second edition, edited by: Grasshoff, K., Ehrhardt, M., and Kremling, K., Verlag Chemie GmbH, Basel, pp. 125-188, 419 pp., 1983. Hydes, D.J. et al. Use of a Ferry-Box system to look at shelf sea and ocean margin processes. In: Dahlin H., Flemming N.C., Nittis K., Petersson S.E. (Eds.), Building of the European Capacity in Operational Oceanography. Elsevier Oceanography Series 69, 2 Hydes, D. J., Yool, A., Campbell, J. M., Crisp, N. A., Dodgson, J., Dupee, B., Edwards, M., Hartman, S. E., Kelly-Gerreyn, B. A., Lavin, A. M., González-Pola, C. M. and Miller, P.: Use of a Ferry-Box system to look at shelf sea and ocean margin processes, edited by: Dahlin, H., Flemming, N. C., Nittis, K., Petersson, S. E., Building of the European Capacity in Operational Oceanography, Elsevier Oceanography Series, 69, 297-303, 2003. Millero, F. J., Dickson, A. G., Eischeid, G., Goyet, C., Guenther, P., Johnson, K. M., Key, R. M., Lee, K., Purkenson, D., Sabine, C. L., Schottle, R. G., Wallace, D. W. R., Lewis, E., and Winn, C. D.: Assessment of the quality of the shipboard measurements of total alkalinity on the WOCE Hydrographic Program Indian Ocean CO2 survey cruises 1994-1996, Mar. Chem., 63, 9-20, 1998</gco:CharacterString>
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In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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Abbreviation: CTDSAL;
Controlled vocabulary name: SALINITY;
In-situ / Manipulation / Response variable: in-situ observation</gco:CharacterString>
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Controlled vocabulary name: total alkalinity;
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