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

Data file(s): ACE_watervapour_isotopes_SWI13_1h.csv; ACE_watervapour_isotopes_SWI13_5min.csv

File header
d18O: delta-values of the heavy oxygen isotopologue 18O averaged over time intervals of one hour or five minutes [per mill]
d18O_sd: standard deviation of d18O over time intervals of one hour or five minutes [per mill]
d2H: delta-values of the heavy hydrogen isotopologue deuterium (2H) averaged over time intervals of one hour or five minutes [per mill]
d2H_sd: standard deviation of d2H over time intervals of one hour or five minutes [per mill]
dexc: d-excess, calculated from d180 and d2H (dexc = d2H - 8*d18O), averaged over time intervals of one hour or five minutes [per mill]
dexc_sd: standard deviation of dexc over time intervals of one hour or five minutes [per mill]
H2O: water vapour mixing ratio averaged over time intervals of one hour or five minutes [ppmv]
H2O_sd: standard deviation of H2Oover time intervals of one hour or five minutes [ppmv ]
time_ISO8601: Date and time at the end of each time interval of one hour or five minutes in the ISO 8601 format YYYY-MM-DDThh:mm:ss+00:00 [UTC]

NaN
NaN values denote missing values because of e.g., maintenance, instrument calibration, large cavity variations