pmc

  PI:              Wilford Gardner
  of:              Texas A & M University
  dataset:         Particulate matter concentration from filtered Niskin Bottles
  project/cruise:  North Atlantic Bloom Experiment / 119 leg 4
  ship:            R/V Atlantis II

  Methodology
  See:  Gardner, W.D., I.D. Walsh, and M.J. Richardson, 1993.  Biophysical forcing of 
  particle production and distribution during a spring bloom in the North Atlantic.
  Deep-Sea Research II, Vol. 40, No. 1/2, pp. 171-195 

  PI-Notes:
  Only stations at 47N (stations 11-23) were used in PMC vs Beam Cp calculations.                        
  Dregs means the water below the spigot was sampled on a separate filter. 
  MP means a Millipore filter funnel was used to filter the water rather than
  in-line filtration because of the high concentrations.

  The Dregs Concentration is the mass filtered from below the bottle spigots divided
  by the volume of the water filtered from below the spigots, so it includes the
  particles in the water at the time the bottle was closed.  It is assumed that the
  excess particles below the spigots were distributed throughout the bottle at the time
  of closure (probably in the form of aggregates).  The measured volume of the water 
  bottles used in NABE was 29.6 liters.


  Parameter        Description                                      Units
 

  year             year (as YYYY)                                   YYYY
  event            event number, from event log                     MMDDhhmm 
  sta              station number from event log                    dimensionless
  cast             cast/operation number, numbered consecutively    dimensionless
                      within station
  bot              rosette bottle number                            dimensionless 
  press            sample depth reported as pressure                decibars
  PMC_kg_vol_filt  volume filtered (reported as mass)               kilograms
  PMC_kg           particulate matter concentration                 micrograms/kilogram
  dregs_mass       weight of particulates in dregs volume filtered  micrograms
  dregs_vol_filt   dregs volume filtered                            liters
  dregs_corr_conc  dregs corrected concentration                    micrograms/liter
  dregs_corr_fact  dregs correction factor                          dimensionless 
  comments         indicates if a dregs sample was collected        free text