HEADING UNITS DESCRIPTION JulDay dec_day Julian day Date day-mo-yr Date Time hr:min Time (GMT) Lat degrees Latitude in decimal degrees Long degrees Longitude in decimal degrees Water_XCO2 ppm mole fraction of CO2 in air Air_XCO2 ppm mole fraction of CO2 in water EquilT oC Temperature in equilibrator Pressure mBar Barometric pressure SST oC Sea surface temperature (at bow intake) TSG_SAL psu Salinity at bow intake fCO2equil uatm Fugacity of CO2 in equailibrator Water_fCO2 uatm Fugacity of CO2 corrected to SST Air_fCO2 uatm Fugacity of CO2 in air fCO2 uatm Water-air difference