Underway measurements metadata form

• Investigator:
  • Name: Dr. RIchard Feely
  • Organization: NOAA/PMEL
  • Address:
    7600 Sand Point Way NE Seattle, WA 98115
  • Phone: 206-526-6214
  • Email: Richard.A.Feely@noaa.gov
• Dataset Info:
  • Dataset ID: M20704.csv
  • Submission Dates:
    • Initial Submission: 2008/09/08
    • Revised Submission:
• Cruise Info:
  • Experiment:
    • Experiment Name: Underway measurement of atmospheric and surface water pCO2
    • Cruise:
      • Cruise ID: M20704
      • Section:
      • Geographical Coverage:
        • Geographical Region:
          
        • Bounds:
          • Westernmost Longitude: -125.793
            Degrees, Minutes, Seconds: E
          • Easternmost Longitude: -121.847
            Degrees, Minutes, Seconds: E
          • Northernmost Latitude: 35.406
            Degrees, Minutes, Seconds: N
          • Southernmost Latitude: 38.025
            Degrees, Minutes, Seconds: N
      • Temporal Coverage:
        • Start Date: 2007/06/05
        • End Date: 2007/06/11
      • Ports of Call:
        San Francisco San Francisco
  • Vessel:
    • Vessel Name: McArthur II
    • Vessel ID: WTEJ
    • Country: United States
    • Vessel Owner: NOAA
• Variables Info:
  • Variable:
    • Variable Name: xCO2W_PPM
    • Description of Variable: Mole fraction of CO2 (dry) in headspace of equilibrator at Teq, ppm
  • Method Description:
    • Equilibrator Design:
      • Equilibrator type: Showerhead
      • Equilibrator volume:~0.5 L with headspace of ~0.8 L
      • Water_Flow_Rate: 3.5 L/minute
      • Headspace_Gas_Flow_Rate:60 mL/minute
      • Vented: Yes
    • Measurement Method: Infrared absorption of dried gas
    • Manufacturer of Calibration Gas: NOAA/ESRL
    • C0₂ Sensors:
      • Manufacturer: Li-Cor
      • Model: 6262, Serial number IRG3-1242
      • Environmental Control:
        Gas Standards concentrations: 299.45 360.15 493.18 547.55
      • Resolution: 0.2 uatm
      • Uncertainty: 0.1 uatm
      • Calibration:
        System is calibrated every 2.5 hours with the gas standards listed above. Hart thermometers are calibrated annually.
    • Other sensors:
      • Manufacturer: Seabird Thermosalinograph
      • Model: 45
      • Resolution: Temperature - 0.001
      • Calibration:
        Seabird TSG 45 calibrated annually
    • Method References:
      Feely, R.A., R. Wanninkhof, H.B. Milburn, C.E. Cosca, M. Stapp, and P.P. Murphy, A new automated underway system for making high precision pCO2 measurements onboard research ships, Analytica Chim. Acta, 377, 185-191, 1998. and Wanninkhof and Thoning, Measurement of fugacity of Carbon Dioxide in surface water and air using continuous sampling methods, Marine Chemistry, 44, 189-205, 1993.
  • Additional Information:
    The system runs a full cycle in approximately 112 minutes. The cycle starts with 4 standard gases, then measures 10 atmospheric samples followed by 60 surface water samples. Each new gas is flushed through the Licor Analyzer for 4 minutes prior to a 10 second reading from the analyzer during which the sample cell is open to the atmosphere. Subsequent samples of the same gas are flushed through the Licor Analyzer for 30 seconds prior to a stop-flow measurement.
  • Data Set References:
    http://www.pmel.noaa.gov/co2/uwpco2/
  • Citation:
    http://www.pmel.noaa.gov/co2/uwpco2/
• Data Set Link:
  • URL: http://www.pmel.noaa.gov/co2/uwpco2/
  • Label: M20704.csv
  • Link Note: