Information on CTD raw data observed by R/V MIRAI (Cruise number : MR98-K01) 1. Preface ---------- CTD(Conductivity-Temperature-Depth profiler) is used to observe the vertical profiles of temperature and conductivity. Usually, this system is operated with multicylinder water sampler. Observed signal is transmitted from sensor to the operation room on board using wire cable, and electric power is supplied from vessel to sensor. Details of sensors attached to CTD system for MR98-K01 cruise are presented in section 3. The following software, developed and supplied by the Sea-Bird Electronics, Inc., was used in MR98-K01. SEASAVE(ver 4.226) for data acquisition SEASOFT(ver 4.226) for data processing Data presented on this website is averaged over 1m. 2. CTD sampling system ---------------------- Followings are the options for CTD/RMS(Rosette Multi Sampler) systems; system1 : CTD/RMS and 36 Niskin bottles of 12L system2 : CTD/RMS and 12 Niskin bottles of 12L 3. Sensors --------------------- CTD/RMS system1 (1) Temperature sensor Model : SBE3-04F, Sea-Bird Electronics,Inc. Serial number : 031359 Measurement range : -5.0 to +35degC Accuracy : 0.001degC Resolution : 0.0002degC (2) Salinity sensor Model : SBE4-04/O, Sea-Bird Electronics,Inc. Serial number : 041202 Measurement range : 0.0 to 7S/m Accuracy : 0.0003S/m Resolution : 0.00004S/m (3) Pressure sensor Model : SBE9plus, Sea-Bird Electronics,Inc. Serial number : 42410 Measurement range : up to 10500m Accuracy : 0.015%F.S. Resolution : 0.001%F.S. (4) DO sensor Model : SBE13-04, Sea-Bird Electronics,Inc. Serial number : 130338 Measurement range : 0-15ml/l Accuracy : 0.1ml/l Resolution : 0.01ml/l (5) Altimeter Model : Benthos 2110-1, Serial number : 0206 CTD/RMS system2 (1) Temperature sensor Model : SBE3-04F, Sea-Bird Electronics,Inc. Serial number : 031525 Measurement range : -5.0 to +35degC Accuracy : 0.001degC Resolution : 0.0002degC (2) Salinity sensor Model : SBE4-04/O, Sea-Bird Electronics,Inc. Serial number : 041205 Measurement range : 0.0 to 7S/m Accuracy : 0.0003S/m Resolution : 0.00004S/m (3) Pressure sensor Model : SBE9plus, Sea-Bird Electronics,Inc. Serial number : 42423 Measurement range : up to 10500m Accuracy : 0.015%F.S. Resolution : 0.001%F.S. (4) Altimeter Model : Benthos 2110-1, Serial number : 0205 4. Notes --------- (1) Observed data by system1 is stored in the data file, its filename includes the letter of 'L' or 'l'. Observed data by system2 is stored in the data file, its filename includes the letter of 'S' or 's'. (2) D.O. sensor was not attached to system2 in this cruise. So numerics presented in D.O. column have no meaning. (3) Data are averaged over 1m. Only for the file named 'd8k119s2.ctd', data is averaged over 1dbar. (4) Data processing sequence for SEASOFT is presented in the following table. command procedure list Each command has the following function. -------------------------------------------------------------------- command function -------- ---------------------------------------------------------- datcnv Convert raw data to engineering units, and store converted data in file. section Extract rows of data from file. wildedit Mark a data value with badflag to eliminate wild points. binavg Average data, basing bins on pressure, depth, scan number, or time range. split Split data in file into upcast and downcast files. --------------------------------------------------------------------