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

• Investigator:
  • Name: D. Hydes, Z. Jiang, M.C. Hartman, J.M. Campbell, S.E. Hartman, M.R. Pagnani, B.A. Kelly-Gerreyn
  • 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
• Dataset Info:
  • Dataset ID: NOC_CNCo_Pacific_Celebes_2007-2012
  • Submission Dates:
    • Initial Submission: 20100924
    • Revised Submission: 20121017
• Cruise Info:
  • Experiment:
    • Experiment Name: NOC_CNCo_Pacific_Celebes
    • Cruise:
      • Cruise ID:
      • Section:
      • Geographical Coverage:
        • Geographical Region:
          Pacific, Atlantic, Indian Ocean, Mediterranean Sea, Red Sea, Arabian Sea. Before May 2009, the ship travelled on a route which circumnavigated the globe from west to east. Between May 2009 and October 2009, it traded on a route that ran through the Suez Canal to Indonesia before passing the Cape of Good Hope travelling to America. From October 2009, the ship repeatedly crossed the Pacific between west US/Canada and New Zealand.
        • Bounds:
          • Westernmost Longitude: -180.000
            Degrees, Minutes, Seconds: E
          • Easternmost Longitude: +180.000
            Degrees, Minutes, Seconds: E
          • Northernmost Latitude: +48.514
            Degrees, Minutes, Seconds: N
          • Southernmost Latitude: -41.604
            Degrees, Minutes, Seconds: N
      • Temporal Coverage:
        • Start Date: 2007/06/11
        • End Date: 2012/03/19
      • Ports of Call:
        
  • Vessel:
    • Vessel Name: MV Pacific Celebes
    • Vessel ID: IMO: 8126599, MMSI: 477868000
    • Country: Hongkong, China
    • Vessel Owner: China Navigation Company, Swire Group
• 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:
            90 91 93 97 99
          • 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 neglectable (0.02%).
        • Poison Volume(mL): 0.05
      • Accuracy Info:
        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). 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 1.8±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:
        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). 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 1.8±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
    • 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:
    Hydes, D.J. and Campbell, J.M. (2007) Report on the SNOMS Swire NOCS Ocean Monitoring System. Maintenance and underway sampling protocols and safety information for the MV Pacific Celebes system fitted June 2007. Southampton, UK, National Oceanography Centre Southampton, 27pp. (National Oceanography Centre Southampton Internal Document, 9) Hydes, D.J. and Campbell, J.M. (2007) Report on the SNOMS Swire NOCS Ocean Monitoring System. System description and inventory for the MV Pacific Celebes system fitted June 2007. Southampton, UK, National Oceanography Centre Southampton, 15pp. (National Oceanography Centre Southampton Internal Document, 8) Hydes, D.J. and Campbell, J.M. (2007) SNOMS Swire NOCS Ocean Monitoring System: Diary of the system development and installation on the MV Pacific Celebes in 2006 and 2007. Southampton, UK, National Oceanography Centre Southampton, 22pp. (National Oceanography Centre Southampton Internal Document, 10)
  • Data Set References:
    
  • Citation:
    
  • Data Set Link:
    • URL: http://www.noc.soton.ac.uk/snoms/
    • Label: NOC_CNCo_Pacific_Celebes
    • Link Note: