N_uptake

  PI:                James McCarthy and John Nevins
  of:                Harvard University
  dataset:           Nitrogen-15 uptake rates for labeled substrates of NO2,
                       NO3, NH4 and UREA
  project:cruise:    North Atlantic Bloom Experiment/cruise 119, leg 5   
  ship:              R/V Atlantis II
   
  Methodology
  Sampling and analytical procedures (McCarthy)
  
  
  Parameter   Description                                  Units

  year        year (as YYYY)                               dimensionless
  event       event number from event log                  dimensionless
  sta         station number from event log                dimensionless
  cast        CTD rosette cast number, from event log      dimensionless
  bot         bottle number                                dimensionless
  depth       sample depth                                 meters
  pNO2        N-15 uptake from nitrite labeled substrate   nanomolar/hour
  pNO3        N-15 uptake from nitrate labeled substrate   nanomolar/hour
  pNH4        N-15 uptake from ammonium labeled substrate  nanomolar/hour
  pUrea       N-15 uptake from urea labeled substrate      nanomolar/hour