MIRAI MR02-K06 Leg2 Conductivity-Temperature-Depth Profiler (CTD)

  1. Sensors
  2. • Water Temperature (Type : SBE3, S/N : 032730)
    (a) Calibration date
    Pre-calibration : 02 Nov.,2002 at SBE T-sensor
    Post-calibration: 15 Apr.,2003 at SBE T-sensor
    (b) Drift
    0.00008 degrees-C/year
    (c) Estimated error
    As presented above, the drift rate for temperature is calculated from pre and post calibrations as 0.00008 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, 02 Nov.,2002 until the last day of MR02-K06 Leg2 on 12 Jan.,2003, it takes about 0.19 year. Then the error of water temperature data observed by CTD is estimated as 0.0000 degrees-C for the cruise of MR02-K06 Leg2.

    • Salinity (Type : SBE4, S/N : 041088)
    (a) Calibration date
    Pre-calibration : 01 Nov.,2002 at SBE C-sensor
    Post-calibration: 24 Jun.,2003 at SBE C-sensor
    (b) Drift
    -0.00010 PSU/month

    • Pressure (Type : SBE9plus, S/N : 79511)
    (a) Calibration date
    Pre-calibration : 07 Feb.,2002 at PAROSCIENTIFIC P-sensor
    Post-calibration: 15 Apr.,2003 at JAMSTEC P-sensor
    (b) Drift
    -0.61 dbar/year
    (c) Estimated error
    As presented above, the drift rate for pressure is calculated from pre and post calibrations as -0.61 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, 07 Feb.,2002 until the last day of MR02-K06 Leg2 on 12 Jan.,2003, it takes about 0.93 year. Then the error of pressure data observed by CTD is estimated as -0.6 dbar for the cruise of MR02-K06 Leg2.

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