Raw stable water isotope measurements in water vapour at 13.5 m a.s.l., made in the austral summer of 2016/2017 during the Antarctic Circumnavigation Expedition (ACE). 

Data files: HIDS2054-${year}${month}${day}-${time:HHmmss}Z-DataLog_User.dat

File header

DATE: Date of measurement [UTC]        
TIME: Time of measurement hh:mm:ss [UTC]
FRAC_DAYS_SINCE_JAN1: Days since 1 January of the year of measurement
FRAC_HRS_SINCE_JAN1: Hours since 1 January of the year of measurement
JULIAN_DAYS: Continuous count of days of the year, including fraction for hours of the day
EPOCH_TIME: Number of seconds that have elapsed since January 1, 1970 [midnight UTC]
ALARM_STATUS: Alarm status of instrument
INST_STATUS: Instrument status
CavityPressure: Pressure in instrument cavity [Torr]
CavityTemp: Temperature in instrument cavity [degrees C]
WarmBoxTemp: Temperature in instrument warm box [degrees C]
DasTemp: Temperature in instrument case [degrees C]
EtalonTemp: Instrument temperature [degrees C] (not relevant)
MPVPosition: MPV position (not relevant)
OutletValve: Outlet valve flow rate
ValveMask: Mask denoting which valve was used for measurements
H2O: Water vapour mixing ratio [ppmv]
Delta_18_16: Delta-values of 18O [per mill]
Delta_D_H: Delta-values of deuterium (2H) [per mill]
CH4: Methane measurements (not calibrated during cruise)
n2_flag: N2 flag (not relevant)
slope_shift: Fitting parameter of instrument's algorithm (not relevant)
baseline_shift: Fitting parameter of instrument's algorithm (not relevant)
residuals: Residuals of fitting by instrument's algorithm (not relevant)                 
AmbientPressure: Ambient pressure (not relevant)

Where parameters are noted as (not relevant) these were measurement modes in which the instrument wasn't operated/set up during this expedition and should not be used.