ctd

 PI:              John Morrison
 of:                North Carolina State University
 PI for Optics:   Wilford Gardner & Mary Jo Richardson
 of:                Texas A&M University
 dataset:         Final version CTD, including beam attenuation optics 
 project/cruise:  AESOPS/KIWI09 - APFZ Process Cruise 2
 ship:            Roger Revelle

 Sampling Methodology
 Sampling Methodology, Optics
 Notes on Beam C corrections

 AESOPS Investigators, Please note:
  Begin and end parameters for time, latitude and longitude are
  provided in the core CTD and Bottle data.  Investigators
  submitting data related to CTD/Bottle casts are urged to use
  the single lat/lon entry from the Chief Scientist's event log.

 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
 cast        CTD rosette cast number
 date        date (YYYYMMDD) decoded as follows
               YYYY = year, MM = month, DD = day
               Date converted to GMT
 time_begin  starting time of cast in UTC                decimal hours
 time_end    ending time of cast in UTC                  decimal hours
 lat_begin   starting latitude, negative = south         decimal degrees
 lon_begin   starting longitude, negative = west         decimal degrees
 lat_end     ending latitude                             decimal degrees
 lon_end     ending longitude                            decimal degrees
 depth       depth of sample                             meters
 press       depth of sample reported as pressure        decibars
 temp        temperature, IPTS-68                        degrees C
 cond        conductivity CTD                            milliSiemens/centimeter
 sal         salinity, PSS-78                            PSU
 potemp      potental temperature, IPTS-68               degrees C
 sigma_t     sigma t                                     kilograms/meter^3
 sigma_0     potental density                            kilograms/meter^3
 O2_ml_L     oxygen                                      milliliters/liter
 O2_umol_kg  oxygen                                      micromoles/kilogram
 O2_umol_L   oxygen                                      micromoles/liter
 beam_cp     beam attenuation due to particles           1/meter
 fluor       relative fluorescence, corrected by         milligram/meter^3
               Seabird software to chlorophyll-a
 light_bs    backscattered light from a Light            volts
               Scattering Sensor                 
 nd          no/bad data