MIRAI MR08-05 Underway Thermosalino Graph Calibration Information

  1. Sensors
  2. ・ Water Temperature (Type : SBE3S, S/N : (032607)-2607)
    (a) Calibration date
    Pre-calibration : 2008-06-24 at SBE T-sensor
    Post-calibration : 2009-07-07 at SBE T-sensor
    (b) Drift
    -0.00091 degrees-C/year
    (c) Estimated error
    As presented above, the drift rate for temperature is calculated from pre and post calibrations as -0.00091 degrees-C/year. Hypothesizing the linearity in T-sensor drift, the error of water temperature is tried to estimate using the drift rate.
    From pre-calibration date, 2008-06-24 until the last day of MR08-05 on 2008-11-07, it takes about 0.37 year. Then the error of water temperature data observed by CTD is estimated as -0.0003 degrees-C for the cruise of MR08-05.

    ・ Salinity (Type : SBE21, S/N : 2126391-3126)
    (a) Calibration date
    Pre-calibration : 2008-06-19 at SBE C-sensor
    Post-calibration : 2009-07-25 at SBE C-sensor
    (b) Drift
    0.00030 PSU/month
    (c) Estimated error
    As presented above, the drift rate for salinity is calculated from pre and post calibrations as 0.00030 PSU/month. Hypothesizing the linearity in C-sensor drift, the error of salinity is tried to estimate using the drift rate.
    From pre-calibration date, 2008-06-19 until the last day of MR08-05 on 2008-11-07, it takes about 4.70 months. Then the error of salinity data observed by CTD is estimated as 0.0014 PSU for the cruise of MR08-05.

  3. Comparison with sampled water analysis
  4. ・ Salinity
    Comparison between salinity data measured with TSG and that measured with salinometer is presented in the following table and figure. Water for salinometer is sampled from bypass line of TSG. Salinometer used for this analysis is Autosal model 8400B manufactured by Guildline Instruments Inc.
    ・ D.O. : Dissolved Oxygen
    Comparison between DO data measured with TSG and that measured by Winkler method is presented in the following table and figure.