READSF6 file:
Readme me file for UWSF6.CSV: size: 726 K;  last update: 11/6/96
11/6/96: extrapolatedd 10 GPS locations which were in error

The UWSF6.CSV file is a comma delimited file.  It contains data  from the underway SF6 system which analyzes samples in the headspace of a 1-liter equilibrator .  The equilibrator draws water from the bow intake at 5-m depth  at a rate of 2 l/min.  The system was used to track the tracer patch.  Air is circulated from the headspace in the equilibrator through a sample loop and injected into a gas chromatograph at 3-minute intervals.  When a pre designated response from the detector is obtained, the headspace is flushed with nitrogen.  

The  file contains the following columns:

Sample:  Sample type for the underway SF6 system; 
	WAT: headspace analysis;
	STD: Standard with concentration of 117 ppt (parts per trillion); 
	FLS: Headspace analysis after the headspace is flushed with nitrogen. The FLS is 	an indicator that the ship was in the tracer patch
JD: fractional julian day (Note: 1996 is a leap year)
Date:  Calendar date
Time: Time (GMT)  Local time is: GMT- 4 hrs
Lat: decimal latitude as determined from a GPS receiver.  (Note: due to interference, the position is not always updated correctly)
Long: decimal longitude as determined from a GPS receiver.  (Note: due to interference, the position is not always updated correctly)
R.Time: retention time of the SF6 peak on the gas chromatographic column
Area: peak area of the SF6 signal on the integrator
Peak: peak height of the SF6 signal on the integrator
SST: Sea surface temperature obtained from a thermosalinograph at the bow intake (5-m depth)
Salinity: Salinity obtained from a thermosalinograph at the bow intake (5-m depth)
Fluor: Fluorometer signal of a Turner fluorometer located in the OCEA lab from water from the bow line
disc SF6:  Quantitative SF6 value (in ppt, parts per trillion by volume) from syringe samples taken from the bow line when the ship was in the tracer patch.