ctd

 PI:              John Morrison
 dataset:         CTD profile data averaged at two decibar intervals
 project/cruise:  Arabian Sea/TTN-053 - Process Cruise 6
 ship:            Thomas Thompson

 PI Notes and Methodology
 
 
 Parameter  Description                                  Units

 event      a unique number assigned to each sampling 
              operation consisting of month MM, day DD,
              hour HH and minute mm
 sta        station number
 sta_std    Arabian Sea standard station identifier
 cast       CTD cast number
 date       date (YYYYMMDD) decoded as follows
              YYYY = year, MM = month, DD = day
              Date converted to UTC(GMT)
 time       time of day in UTC(GMT)                      decimal hours
 lat        latitude of cast, negative = south           decimal degrees
 lon        longitude of cast, negative = west           decimal degrees
 depth      sample depth reported as meters              meters
 press      sample depth reported as pressure            decibars
 temp       temperature, IPTS-68                         degrees C 
 cond       conductivity                                 milliSiemens/centimeter
 sal        salinity, PSS-78                             dimensionless
 potemp     potential temperature, IPTS-68               degrees C
 sigma_t    sigma-t                                      kilogram/meter^3
 sigma_0    sigma theta (potental density)               kilogram/meter^3
 
 nd indicates missing or bad data