MIRAI MR13-05 Underway Thermosalino Graph Calibration

  1. Sensors
  2. ・ Water Temperature (Type : SBE38, S/N : 3852788-0457)
    (a) Calibration date
    Pre-calibration : 2013-01-10 at SBE T-sensor
    Post-calibration : 2013-11-13 at SBE T-sensor
    (b) Drift
    0.00032 degrees-C/year
    (c) Estimated error
    As presented above, the drift rate for temperature is calculated from pre and post calibrations as 0.00032 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, 2013-01-10 until the last day of MR13-05 on 2013-08-26, it takes about 0.62 year. Then the error of water temperature data observed by CTD is estimated as 0.0002 degrees-C for the cruise of MR13-05.

    ・ Salinity (Type : SBE45, S/N : 4552788-0264)
    (a) Calibration date
    Pre-calibration : 2013-01-08 at SBE C-sensor
    Post-calibration : 2013-11-09 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, 2013-01-08 until the last day of MR13-05 on 2013-08-26, it takes about 7.67 months. Then the error of salinity data observed by CTD is estimated as -0.0015 PSU for the cruise of MR13-05.

  3. Comparison with sampled water analysis
  4. As for the cruise of MR13-05, there is no data for comparison.