"ACE 1, Leg 2: NOAA PMEL measured atmospheric gas phase NH3 concentrations and calculated air/sea NH3 fluxes from the DIscoverer."

This is the text descriptor file for data contained in the file  ATMNH3FL.CSV.
Questions about these data should be directed to Trish Quinn (quinn@pmel.noaa.gov).

Filter packs consisting of a Teflon filter for the collection of particles and oxalic acid coated filters for the collection of NH3(g) were used for sample collection.
The oxalic acid coated filters were extracted and analyzed for NH4+ by ion chromatography.

"Air/sea ammonia fluxes were calculated from the measured atmospheric (NH3)g, seawater pH, and seawater [NHx]s using the method described by Quinn et al., 1996, Biogeochemistry, in press."

The uncertainty associated with the measured NH3(g) concentrations and air/sea fluxes is estimated to be +/- 25 to 50%.

Columns in the spreadsheet are:

"1, Start Time (GMT)"
"2, Stop Time (GMT)"
"3, Start Latitude"
"4, Stop Latitude"
"5, Start Longitude"
"6, Stop Longitude"
"7, (NH3)g in nmol/m3"
"8, F, umol/m2/d"

Codes used in the spreadsheet:

"NA, not available."