parameter	description	units
cruise id	cruise identifier (ie. NBP0103)	
event	event number	
cast	ctd cast number	
year	"year, in GMT time"	YYYY
yearday	"year day, based on julian calendar, with hour as a fraction of a day"	YYY.yyy
GMT (h)	GMT hour	HH
GMT (min)	GMT minute	MM
lat	latitude (negative = South)	degrees
lat	longitude (negative =  West)	degrees
xgrid	"distance from the grid origin (71 S, 72 W) along x-axis"	km
ygrid	"distance from the grid origin (71 S, 72 W) along y-axis"	km
station	station number or description	
satfl_no	number of saturation flashes	
satfl_len	saturation flash length	instrument units
satfl_dur	saturation flash duration	instrument units
decfl_no	number of decay flashes	
decfl_len	decay flash length	instrument units
decfl_dur	decay flash duration	instrument units
ave_seq	number of flashes averaged per sequence	
cal_file	calibration filename	
FRRF_date	"date of data point collection, from FRRF instrument"	DD:MM:YY
FRRF_time	"time of data point collection, from FRRF instrument"	HH:MM:SS
FRRF_depth	"depth of data point collection, from FRRF instrument"	meters
FRRF_PAR	"photosynthetically available radiation, from FRRF instrument"	microMol quanta m-2 s-1
     FoD	"minimum fluorescence, dark chamber (all reaction centers open)"	relative
     FmD	"maximum fluorescence, dark chamber (all reaction centers open)"	relative
     FvD	"variable fluorescence, dark chamber (Fv = Fm - Fo)"	relative
  Fv/FmD	"Fv/Fm, dark chamber (maximum quantum yield of PSII)"	dimensionless
    SigD	"functional absorption cross-section of PSII (Sigma), dark chamber"	Å2 q-1
      pD	"connectivity parameter (excitation energy transfer PSII to PSI), dark chamber"	dimensionless
    TauD	"time constant of electron transfer PSII to PSI, dark chamber"	microseconds
gain	instrument gain setting