sulfide_peroxide

  PI:        George Luther and Brent Lewis
  dataset:   Sulfide; peroxide ratio
  cruise:    TN045, Arabian Sea Process cruise #2
  ship:      R/V Thomas Thompson

   Note: Zero values for sulfide represent less than the 
           analytical detection limit of 0.2 nM.

Methodology
 
 Parameters    Descriptions                               Units

  event           event number from event log
  sta_std         Arabian Sea standard station identifier
  sta             station number from event log
  cast            CTD cast number
  bot             CTD bottle number
  press           sample depth reported as pressure            decibars
  sulfide         concentration of sulfide                     nM
  H2O2_to_O2      peroxide to oxygen ratio