Discrete measurements (TCO2, TALK, pCO2, and pH) metadata form

• Investigator:
  • Name: D.J. Hydes, Z-P. Jiang, S.E. Hartman, M.C. Hartman
  • Organization: National Oceanography Centre, Southampton
  • Address:
    Euopean Way, National Oceanography Centre, Southampton, University of Southampton, Southampton, United Kingdom SO14 3ZH
  • Phone: +44 (0)23 80596547
  • Email: djh@soton.ac.uk; zongpei.jiang@noc.soton.ac.uk; suh@noc.ac.uk; mch@noc.ac.uk
• Dataset Info:
  • Dataset ID: NOC_Pride_of_Bilbao_2005-2010
  • Submission Dates:
    • Initial Submission: 2012/10/17
    • Revised Submission:
• Cruise Info:
  • Experiment:
    • Experiment Name: 2012/10/02
    • Cruise:
      • Cruise ID:
      • Section:
      • Geographical Coverage:
        • Geographical Region:
          Northeast Atlantic. POB route covers a suite of different oceanographic regions from shallow English Channel to deep oceanic Bay of Biscay
        • Bounds:
          • Westernmost Longitude: -6
            Degrees, Minutes, Seconds: E
          • Easternmost Longitude: -1
            Degrees, Minutes, Seconds: E
          • Northernmost Latitude: +51
            Degrees, Minutes, Seconds: N
          • Southernmost Latitude: +43
            Degrees, Minutes, Seconds: N
      • Temporal Coverage:
        • Start Date: 2005/9/26
        • End Date: 2010/9/16
      • Ports of Call:
        
  • Vessel:
    • Vessel Name: MV Pride of Bilbao
    • Vessel ID: IMO: 8414582
    • Country: UK
    • Vessel Owner: P&O Ferries
• Variables Info:
  • Variable:
    • Variable Name: ShipID
    • Description of Variable: The ID of the ship used for collecting the DIC/TA samples
  • Method Description:
    • Total C02 Data:
      • TCO2 Analysis Method:
        The analysis of DIC was undertaken in National Oceanography Centre, Southampton using VINDTA 3C (Marianda, Germany，unit 11 and unit 24). By reaction with phosphoric acid, dissolve inorganic carbon of the sample was converted to CO2. The CO2 gas was carried by N2 into the coulometer cell and reacts with monoethanolamine to form a titratable acid which causes the fading of the blue indicator. Responding to the colour change, a current flow generates base to remove the acid and restore the indicator to the original colour. The amount of CO2 can be estimated from the required coulombs of the current required (corrected for blank), and DIC concentration can then be calculated given the known sample volume.
      • Standardization Technique:
        • Technique 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).
        • Sample Volume(mL):
        • CRM Info:
          • Correction Magnitude: the averaged correction factor is 0.9937
          • Batch Number:
            81 90 91 93 97 98 99 105
          • CRM Analysis Info:
            
      • Field Replicate Info:
        
      • Poisoning Info:
        • Poisoning Correction Description:
          Saturated HgCl2 (0.05 mL) is added to the collected sample to prevent the sample from biological modification. Since we use a large sampling volume (250 mL), the dilution effect of adding HgCl2 is negligible (0.02%).
        • Poison Volume(mL): 0.05
      • Accuracy Info:
        Repeated measurements on the same batch of seawater (n>=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 2.0±0.7 μmol kg-1 for DIC and 1.2±0.5 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 References:
        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. 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
    • Alkalinity:
      • Curve Fitting Method:
        non-linear curve fitting (least-squares) approach (Dickson et al., 2007)
      • 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).
      • Description of Other Titration:
        
      • Cell Type: open cell
      • CRM Scale:
      • Sample Volume(mL):
      • Magnitude of Blank Correction:
      • Accuracy Info:
        Repeated measurements on the same batch of seawater (n>=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 2.0±0.7 μmol kg-1 for DIC and 1.2±0.5 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 References:
        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., Gonz´alez-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
    • pCO2 Data:
      • Analysis:
        • pCO2 Analysis Method:
          
        • Sample Volume(mL):
        • Headspace Volume:
        • Measurement Temperature:
        • Temperature Normalization:
        • Temperature Correction Method:
        • Variable Reported:
        • Gas:
        • Standard Gas Concentrations:
        • Frequency of Standardization:
      • Field Replicate Info:
        
      • Storage Method:
        
      • Accuracy Info:
        
      • Method References:
        
    • pH Data:
      • pH Scale:
      • pH Analysis Method:
        
      • Calibration Info:
        • Calibration Description:
          
        • In Situ Temperature:
        • Temperature of Analysis:
        • Temperature Normalization:
        • In Situ Pressure:
      • Accuracy Info:
        
      • Method References:
        
  • Additional information:
    
  • Data Set References:
    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.
  • Citation:
    
  • Data Set Link:
    • URL: http://www.noc.soton.ac.uk/ops/ferrybox_index.php
    • Label: NOC_Pride_of_Bilbao
    • Link Note: