mulvfs_beamc

 PI:             James K. Bishop
 dataset:        Beam attenuation, transmissometer data from MULVFS casts
 project/cruise: EQPAC/TT007
 ship:           Thomas Thompson


 Reference:  Bishop, J.K.B. (1986). The correction and suspended mass
             calibration of Sea Tech transmissometer data. 
             Deep-Sea Research, 33: 121-134. 


 Parameter    Description                                         Units 
  
 event        event number from event log 
                 format (MMDDhhmm) - time is local time
 sta          station number from event log  
 cast         MULVFS cast number 
 data_rev     revison date of station data (format YYMMDD)
 lat          latitude at time of start of downcast 
                 negative numbers south
 lon          longitude at time of start of downcast
                 negative numbers west
 cast_type    downcast or upcast
 press        insitu pressure, accuracy +/- 3dBar                 decibars
 temp         in-situ temperature, accuracy +/- 0.01              degrees C
 sal          salinity, accuracy +/- 0.01 psu                     psu
 beam_c       beam attenuation coefficient (calibrated)           meters^-1
                 1-m pathlength SeaTech transmissometer @675 
                 nm data are reproducible to better than
                 0.001 in deep water between TT007 and TT011. 
                 clear water value for beamc is 0.364.