low_level_NO3

  PI:              Christopher Garside
  dataset:         Low level Nitrate concentrations from CTD casts
  project/cruise:  Arabian Sea/TN053 - Process Cruise 6  
  ship:            Thomas Thompson
 
  Samples were obtained from the CTD rosette.  The trace metal-clean 
  (TM) rosette package was lost on a previous cruise.

  Methodology 

 Parameter         Description                                Units

  event            event number from event log 
  sta              station number from event log 
  sta_std          Arabian Sea standard station identifier
  cast             cast number from event log 
  bot              bottle number from trace metal cast 
  press            sample depth reported as pressure          decibars
  NO3_nano         low level nitrate concentration            nanomoles/liter