MIRAI MR98-K01 Conductivity-Temperature-Depth Profiler (CTD)

  1. Sensors
  2. • Water Temperature (Type : SBE3, S/N : 031359)
    (a) Calibration date
    Pre-calibration : 07 May, 1998 at SBE T-sensor
    Post-calibration: 06 Jan.,1999 at SBE T-sensor
    (b) Drift
    0.00499 degrees-C/year
    (c) Estimated error
    As presented above, the drift rate for temperature is calculated from pre and post calibrations as 0.00499 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 May, 1998 until the last day of MR98-K01 on 15 Dec.,1998, it takes about 0.61 year. Then the error of water temperature data observed by CTD is estimated as 0.0030 degrees-C for the cruise of MR98-K01.

    • Water Temperature (Type : SBE3, S/N : 031525)
    (a) Calibration date
    Pre-calibration : 20 Aug.,1998 at SBE T-sensor
    Post-calibration: 29 Apr.,1999 at JAMSTEC T-sensor
    (b) Drift
    -0.00216 degrees-C/year
    (c) Estimated error
    As presented above, the drift rate for temperature is calculated from pre and post calibrations as -0.00216 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, 20 Aug.,1998 until the last day of MR98-K01 on 15 Dec.,1998, it takes about 0.32 year. Then the error of water temperature data observed by CTD is estimated as -0.0007 degrees-C for the cruise of MR98-K01.

    • Salinity (Type : SBE4, S/N : 041202)
    (a) Calibration date
    Pre-calibration : 12 May, 1998 at SBE C-sensor
    Post-calibration: 07 Jan.,1999 at SBE C-sensor
    (b) Drift
    -0.00080 PSU/month

    • Salinity (Type : SBE4, S/N : 041205)
    (a) Calibration date
    Pre-calibration : 20 Aug.,1998 at SBE C-sensor
    Post-calibration: 07 Jul.,1999 at SBE C-sensor
    (b) Drift
    -0.00170 PSU/month

    • Pressure (Type : SBE9plus, S/N : 42410)
    (a) Calibration date
    Pre-calibration : 17 May, 1994 at PAROSCIENTIFIC P-sensor
    Post-calibration: 07 Jul.,1999 at SBE P-sensor
    (b) Drift
    -0.01 dbar/year
    (c) Estimated error
    As presented above, the drift rate for pressure is calculated from pre and post calibrations as -0.01 dbar/year. Hypothesizing the linearity in P-sensor drift, the error of pressure is tried to estimate using the drift rate.
    From pre-calibration date, 17 May, 1994 until the last day of MR98-K01 on 15 Dec.,1998, it takes about 4.58 year. Then the error of pressure data observed by CTD is estimated as -0.1 dbar for the cruise of MR98-K01.

    • Pressure (Type : SBE9plus, S/N : 42423)
    (a) Calibration date
    Pre-calibration : 17 May, 1994 at PAROSCIENTIFIC P-sensor
    Post-calibration: 17 Apr.,2000 at JAMSTEC P-sensor
    (b) Drift
    0.09 dbar/year
    (c) Estimated error
    As presented above, the drift rate for pressure is calculated from pre and post calibrations as 0.09 dbar/year. Hypothesizing the linearity in P-sensor drift, the error of pressure is tried to estimate using the drift rate.
    From pre-calibration date, 17 May, 1994 until the last day of MR98-K01 on 15 Dec.,1998, it takes about 4.58 year. Then the error of pressure data observed by CTD is estimated as 0.4 dbar for the cruise of MR98-K01.

    • Dissolved Oxygen (Type : SBE13, S/N : 130338)
    (a) Calibration date
    Pre-calibration : 17 Jul.,1998 at SBE D.O.-sensor
    Post-calibration was not carried out by loss of the sensor.

  3. Comparison with sampled water analysis
  4. The comparison between the CTD measurement and the bottle measurement can be used on the following pages.