Calibrated data of stable water isotope measurements in water vapour at 8 m a.s.l. on the starboard side of the ship, made in the austral summer of 2016/2017 around the Southern Ocean during the Antarctic Circumnavigation Expedition. ***** Dataset abstract ***** This data set includes the calibrated data of stable water vapour isotope (δ18O, δ2H, deuterium excess) and water vapour mixing ratio measurements at approximately 8 m a.s.l. on the starboard of the ship, taken around the Southern Ocean during the Antarctic Circumnavigation Expedition (ACE) from February to March 2017 using a Picarro laser spectrometers L2130-i. The data provide continuous timelines of atmospheric water vapour properties in the marine boundary layer for studies of the atmospheric water cycle. The raw data from which this calibrated dataset originates has been published separately (Kozachek, 2020; DOI 10.5281/zenodo.3667535). Two other calibrated stable water isotope measurement datasets were also collected during ACE. They differ by the location of measurement on the ship: 8 m a.s.l on the port side and 13.5 m a.s.l. ***** Original data collection ***** Data were collected at 8 m a.s.l. on the starboard side of the R/V Akademik Tryoshnikov using a Picarro laser spectrometer L2130-i and saved directly into comma-separated values (csv) files. See the ACE Cruise Report (Walton and Thomas, 2018) and Thurnherr et al. (2020) for more information on the set-up of the instrumentation. Picarro software was used to collect the data. During the data collection, delta-ratios were automatically calculated by the laser spectrometer’s software using Vienna standard mean ocean water (VSMOW2) as a reference. The raw data from which this calibrated dataset originates has been published separately (Kozachek, 2020; DOI 10.5281/zenodo.3667535). ***** Quality checking ***** The data was filtered for cavity variability. If cavity pressure (regulated at 50 torr for L2130) deviates significantly from the regulated values, the data was discarded. The data quality is described in high detail in an overview paper on the stable water isotope measurements (Thurnherr et al., 2020). The mean one-hourly standard deviation of the data is 2.4‰ for δ2H, 0.4‰ for δ18O, 2.4‰ for d-excess and 150 ppmv for H2O. ***** Data processing ***** The data was calibrated using the python (version 3.4.6) scripts calibration_script_final.py and functions_calibration_swi.py (Thurnherr and Aemisegger, 2020; DOI 10.5281/zenodo.3268642). Stable water isotopes (δ18O and δ2H) - stable calibration runs are selected (cal_runs_SWI8-sb.csv) and interpolated along time lines using a running mean. - raw data is filtered for cavity disturbances and instrument calibration (cal_flag_times_SWI8-sb.csv) - data is corrected for isotope-humidity dependency of laser spectrometer measurements - slope correction according to IAEA is used to correct for measurement bias. - the calibrated values are averaged to resolutions of 5 minutes and 1 hour. The time stamp denotes the end time of the averaging period. The calibration procedure and its uncertainties are described in detail in Thurnherr et al. (2020). ***** Standards ***** The correction has been done according to the IAEA reference sheet and using VSMOW as a reference composition. ***** Further information for interpreting and using the dataset ***** Timescales: The data set is suitable to study meteorological phenomena from 5-minutes up to daily resolution. Interpolation: The resolution should not be above 5 minutes to avoid memory effects of the inlet. Aggregation to lower temporal resolution: The data can be averaged over the anticipated time interval. Depending on the interested geographical extent, the data can be averaged for a resolution of at least one day. It depends on the research question if smaller resolutions are appropriate. - A higher resolution than 5 minutes could include memory effects on the inlet line. - A lower resolution than one day would mean that the averaged value represents a large geographical area as well as different meteorological situations. Depending on the research focus, this might be desired or not. Timestamps in the dataset can be matched to the ACE cruise track data (Thomas and Pina Estany, 2019; DOI 10.5281/zenodo.3260616). ***** Dataset contents ***** - ACE_watervapour_isotopes_SWI8-sb_1h.csv, data file, comma-separated values - ACE_watervapour_isotopes_SWI8-sb_5min.csv, data file, comma-separated values - cal_runs_SWI8-sb.csv, metadata, comma-separated values - cal_flag_times_SWI8-sb.csv, metadata, comma-separated values - data_file_header.txt, metadata, text format - README.txt, metadata, text format NaN values denote missing values which occur because of e.g., maintenance, instrument calibration, large cavity variations. ***** Dataset contact ***** Anna Kozachek, Arctic and Antarctic Research Institute, St. Petersburg, Russia. ORCID: 0000-0002-9704-8064. Email: kozachek@aari.ru ***** Dataset license ***** This calibrated stable water isotope measurements in water vapour is made available under the Creative Commons Attribution 4.0 International License (CC BY 4.0) whose full text can be found at https://creativecommons.org/licenses/by/4.0/ ***** Dataset citation ***** Please cite this dataset as: Kozachek A. and Thurnherr I. (2020). Calibrated data of stable water isotope measurements in water vapour at 8 m a.s.l. on the starboard side of the ship, made in the austral summer of 2016/2017 around the Southern Ocean during the Antarctic Circumnavigation Expedition. (Version 1.0) [Data set]. Zenodo.