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

• Investigator:
  • Name: Krasakopoulou, Dr. Evangelia
  • Organization: Hellenic Centre for Marine Research (HCMR) - Institute of Oceanography
  • Address:
    46.7 km Athens-Sounio Avenue 19013 Anavyssos Greece
  • Phone: +30-22910-76409
  • Email: ekras@hcmr.gr
  Investigator #2:
  • Name: Souvermezoglou, Dr. Ekaterini
  • Organization: Hellenic Centre for Marine Research (HCMR) - Institute of Oceanography
  • Address:
    46.7 km Athens-Sounio Avenue 19013 Anavyssos Greece
  • Phone: +30-22910-76364
  • Email: katerinasouv@hcmr.gr
• Dataset Info:
  • Dataset ID: HCMR OTRANTO-5 cruise, February 1995
  • Submission Dates:
    • Initial Submission: 2011/12/22
    • Revised Submission:
• Cruise Info:
  • Experiment:
    • Experiment Name: EU Otranto project (Hydrodynamics and geochemical fluxes in the Strait of Otranto)
    • Cruise:
      • Cruise ID: GN36199502905 OTRANTO-5-94
      • Section: OTRANTO-5
      • Geographical Coverage:
        • Geographical Region:
          Otranto strait (Eastern Mediterranean)
        • Bounds:
          • Westernmost Longitude: 18.5083
            Degrees, Minutes, Seconds: E
          • Easternmost Longitude: 19.3000
            Degrees, Minutes, Seconds: E
          • Northernmost Latitude: 39.8333
            Degrees, Minutes, Seconds: N
          • Southernmost Latitude: 39.8333
            Degrees, Minutes, Seconds: N
      • Temporal Coverage:
        • Start Date: 1995/02/09
        • End Date: 1995/02/10
      • Ports of Call:
        
  • Vessel:
    • Vessel Name: R/V Aegaeo
    • Vessel ID: 36AE
    • Country: Greece
    • Vessel Owner: Hellenic Centre for Marine Research (HCMR)
• Variables Info:
  • Variable:
    • Variable Name: total dissolved inorganic carbon (CT)
    • Description of Variable: umol/kg
  • Method Description:
    • Total C02 Data:
      • TCO2 Analysis Method:
        The seawater samples for the determination of AT and CT were drawn into 500-1000 mL borosilicate glass bottles sealed with glass stoppers according to the collection methods of DOE (1994). The samples were poisoned with saturated mercuric chloride solution to prevent further biological activity, stored at room temperature away from light and analysed on shore as soon as possible. AT and CT measurements were preformed simultaneously using the potentiometric acid titration method in a closed cell, which was maintained at constant temperature (25+/-0.1 ºC) by a thermostated water bath. The ionic strength of the hydrochloric acid solution (0.1 N) used for the titrations was adjusted with NaCl in order to be similar to that of the samples. The hydrochloric acid solution was added with an automatic burette (ABU 80, Radiometer) and the progress of the titration was monitored using a glass electrode/reference electrode pH cell (PHM-84, Radiometer). The burette and the pH-meter were interfaced with a computer using data-acquisition software. The AT corresponds to the carbonic acid endpoint and the CT concentration is computed by the difference between the two endpoints, which were calculated using a modified Gran approach, a procedure recognized by DOE (1994).
      • Standardization Technique:
        • Technique Description
          
        • Sample Volume(mL):
        • CRM Info:
          • Correction Magnitude:
          • Batch Number:
            Batch #24 supplied by Dr A.G. Dickson of Scripps Institution of Oceanography, La Jolla, CA, USA
          • CRM Analysis Info:
            
      • Field Replicate Info:
        
      • Poisoning Info:
        • Poisoning Correction Description:
          
        • Poison Volume(mL): 0.2-0.5 mL depending on sample volume
      • Accuracy Info:
        The analytical precision for CT based on duplicate seawater samples was 6.3 umol/kg. The accuracy of CT was assessed by measurements of certified reference material (CRM, Batch #24 supplied by Dr A.G. Dickson of Scripps Institution of Oceanography, La Jolla, CA, USA) and was ±5.6 umol/kg.
      • Method References:
        DOE, 1994. Handbook of methods for the analysis of the various parameters of the carbon dioxide system in sea water, version 2, A.G. Dickson & C. Goyet (Eds.), ORNL/CDIAC-74. Available at: http://cdiac.esd.ornl.gov/oceans
    • Alkalinity:
      • Curve Fitting Method:
        modified Gran approach
      • Type of Titration: potentiometric acid titration method
      • Description of Other Titration:
        
      • Cell Type: thermostated closed cell
      • CRM Scale:
      • Sample Volume(mL):
      • Magnitude of Blank Correction:
      • Accuracy Info:
        The analytical precision for AT based on duplicate seawater samples was 5.3 umol/kg. The accuracy of the AT was assessed by measurements of certified reference material (CRM, Batch #24 supplied by Dr A.G. Dickson of Scripps Institution of Oceanography, La Jolla, CA, USA) and was ±3.2 umol/kg.
      • Method References:
        DOE, 1994. Handbook of methods for the analysis of the various parameters of the carbon dioxide system in sea water, version 2, A.G. Dickson & C. Goyet (Eds.), ORNL/CDIAC-74. Available at: http://cdiac.esd.ornl.gov/oceans
    • 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:
    Additional data are also included in the submiteed dataset: Salinity, Temperature [oC], Pot.Temp. [oC], Sigma-Theta, DO [umol/kg], AOU [umol/kg], PO4 [umol/l], SiO4 [umol/kg], NO2+NO3 [umol/kg]
  • Data Set References:
    Krasakopoulou, E., Souvermezoglou, E., Goyet, C. (2011). Anthropogenic CO2 fluxes in the Otranto Strait (E. Mediterranean) in February 1995. Deep Sea Research I 58, 1103–1114.
  • Citation:
    HCMR OTRANTO-5 cruise, February 1995
  • Data Set Link:
    • URL:
    • Label:
    • Link Note:
      to be included in the CARINA (bottle data) database