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Information on XBT raw data observed at R/V MIRAI
(Cruise number : MR99-K04)
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1. Preface
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Using XBT (eXpendable Bathy Thermograph) system, the vertical distribution of water temperature 
is observed during free fall of its probe part in the seawater. On board, the analogue signal 
is converted to the temperature by data processor and the data is stored in PC. Depth data is 
calculated from the elapsed time.

2. System
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(1) Launcher 
     Hand launcher
      Manufacturer   : Sippican,Inc.
      Type           : LM-3A
      Operation area : Rear upper deck
 
     Automatic launcher   
      Manufacturer   : Tsurumi Seiki Co., LTD
      Type           : AL-8
      Location       : Port side of rear   
                       The control panel is installed in the investigation room.

(2) Converter         
     Manufacturer    : Tsurumi Seiki Co., LTD.
     Type            : MK-30N 
     Location        : Investigation room
     Sampling rate   : 50 msec  

(3) XBT probe specifications
     -------------------------------------------
     Type of probe                 TSK DeepBlue
     -------------------------------------------
     Range   [deg-C]               -2 to 35 
     Accuracy [deg-C]              +/- 0.2 
     Maximum depth [m]             760  
     Maximum elapsed time [sec]    123
     Rated ship speed [knot]       20
     Coefficient-a                 6.691
     Coefficient-b                 -2.25
     -------------------------------------------
     'Coefficient-a' and 'Coefficient-b' presented in the above table are used in 
     the following equation, which is used for the depth calculation.
          Z = at + 10E-3 * bt^2 
     Where Z(m) is the depth and t(sec) is the elapsed time.

3. Note
-------
(1) File format information 
     XBT data of all deployments of this cruise are reprocessed by converter,
     MK-130 manufactured by Tsurumi Seiki Co., LTD. And as for the column of
     68-70 presented in the format description should be replaced by the
     following;
     -------------------------------------------------
     Column  Description  Format  Unit  Remarks 
     -------------------------------------------------
     68-70   Depth step   i1,a2   -     Fixed as '1m ' 
     -------------------------------------------------

(2) Position error infomation
     There is no position data for the following file on this cruise.
          199908061154.xbt