phaeopigments

 PI:              Walker O. Smith
 of:              Virginia Institute of Marine Science (VIMS)
 dataset:         Fluorometric chlorophyll-a & phaeopigments
 project/cruise:  AESOPS/NBP97-1 - Ross Sea Process 2 Cruise
 ship:            Nathaniel B. Palmer

 Methodology: Please see Chapter 14 of the JGOFS protocols (1994),
 "Measurements of Chlorophyll a and Phaeopigments by Fluorometric Analysis" 

 PI-Notes on Methodology: 
              25mm GF/F filters
              Extracted volume = 7mL in 90% Acetone
              1.2M HCl = 3 drops
              ASA's 10-AU fluorometer. Blank=0. 
		Calibrated by A.M. White
              (ASA: Antarctic Support Associates)

 Parameter     Description                                    Units

 event         event number from event log
 sta           station number from event log
 cast          cast number from event log
 cast_type     CTD = CTD rosette
               TM = trace metal rosette
 bot           bottle number
 depth_n       nominal depth                                  meters
 Fo_to_Fa      ratio of fluorometer readings, where:
                  Fo = sample reading before acidification
                  Fa = sample reading after acidification
 chl_a_fluor   chlorophyll-a, fluorometric method             micrograms/liter
 phaeo         phaeopigments, fluorometric method             micrograms/liter