MIRAI MR07-05 Underway Thermosalino Graph Calibration Information

  1. Sensors
  2. ・ Water Temperature (Type : SBE3S, S/N : 2175)
    (a) Calibration date
    Pre-calibration : 07 Feb.,2007 at SBE T-sensor
    Post-calibration: 21 Nov.,2008 at SBE T-sensor
    (b) Drift
    -0.00023 degrees-C/year
    (c) Estimated error
    As presented above, the drift rate for temperature is calculated from pre and post calibrations as -0.00023 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, 07 Feb.,2007 until the last day of MR07-05 on 02 Oct.,2007, it takes about 0.65 year. Then the error of water temperature data observed by CTD is estimated as -0.0001 degrees-C for the cruise of MR07-05.

    ・ Salinity (Type : SBE21, S/N : 2641)
    (a) Calibration date
    Pre-calibration : 09 Feb.,2007 at SBE C-sensor
    Post-calibration: 04 Dec.,2008 at SBE C-sensor
    (b) Drift
    0.00020 PSU/month
    (c) Estimated error
    As presented above, the drift rate for salinity is calculated from pre and post calibrations as 0.00020 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, 09 Feb.,2007 until the last day of MR07-05 on 02 Oct.,2007, it takes about 7.8 months. Then the error of salinity data observed by CTD is estimated as 0.0016 PSU for the cruise of MR07-05.

  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.