Stable water vapor isotopologues (d18O and dD) and mixing ratio (ppmv) observations from 2.5 m and 50 m levels above sea level surface. The data was collected between 2013-06-20 and 2013-12-30 at the Tudor Hill Marine Atmospheric Observatory (THMAO) tower of Bermuda Institute of Ocean Sciences (32.2647° N 64.8788° W). Water vapor observations were collected to study isotopic fractionation processes during ocean evaporation. The instrument used was a Picarro cavity ring-down spectroscopy analyzer (model L-2120i). The data was corrected for the humidity-isotope response of the instrument and calibrated on the VSMOW-SLAP scale. Observations at the two inlets are synchronised and resampled every 30 minutes using a common UTC timestamp (Zannoni et al., 2022). The estimated precision is 0.14 ‰ for d18O and 1.1‰ for dD following Steen-Larsen et al. (2014).

The work was also supported by the Carlsberg Foundation and the AXA Research Fund.