Triple water‐isotopologue record from WAIS Divide, Antarctica: Controls on glacial‐interglacial changes in ¹⁷O_excess of precipitation

Calibrated high-precision <sup>17</sup>O-excess measurements using cavity ring-down spectroscopy with laser-current-tuned cavity resonance

“…The potential of 17 O in hydrological research is significant because it provides independent information that may be used to disentangle the competing effects of fractionation during evaporation, in transport, and in the formation and deposition of precipitation (Landais et al, 2008;Risi et al, 2010;Schoenemann et al, 2014). It also has applications in atmospheric dynamics because of the importance of supersaturation conditions that, during the formation of cloud ice crystals, impart a distinctive isotope signature to water vapor (e.g., Blossey et al, 2010;Schoenemann et al, 2014).…”

The influence of the synoptic regime on stable water isotopes in precipitation at Dome C, East Antarctica

“…The second-order parameter deuterium excess (d = δD-8 × δ 18 O), which combines the information from δ 18 O and deuterium, has been used to derive information about both condensation temperature and moisture source conditions, namely wind speed, sea surface temperature, and relative humidity (e.g., Stenni et al, 2001;Uemura et al, 2012). Most recently, due to the development of new measuring techniques, the rare isotope 17 O and the corresponding 17 O excess have been introduced into ice core studies (e.g., Landais et al, 2008Landais et al, , 2012Schoenemann et al, 2014). The 17 O excess is supposed to be insensitive to evaporation temperature and less sensitive than d excess to equilibrium fractionation processes during formation of precipitation.…”

“…The 17 O excess is supposed to be insensitive to evaporation temperature and less sensitive than d excess to equilibrium fractionation processes during formation of precipitation. Thus it may offer the potential of disentangling the different effects of fractionation during evaporation, moisture transport, and precipitation formation (Schoenemann et al, 2014).…”

Water vapor δ2H, δ18O and δ17O measurements using an off‐axis integrated cavity output spectrometer – sensitivity to water vapor concentration, delta value and averaging‐time

“…Phase changes of water tend to fractionate against heavier isotopes (e.g., 2 H, 18 O and 17 O relative to 1 H and 16 O). Therefore, water isotopes are natural tracers of hydrological cycles and can be widely utilized to investigate temporal and spatial variations in ecohydrological processes [1][2][3][4][5][6][7][8] .…”

“…Similar to δ 2 H and δ 18 O, δ 17 O can be used to infer the degree of isotope enrichment during transpiration [11] , serve as tracer in different water bodies (e.g., meteoric water and ice cores) [12][13][14] , and characterize evaporative regimes. 17 O-excess is relatively less sensitive to temperature effects and equilibrium fractionation during the formation and transport of rainfall [15,16] . As a consequence, 17 O-excess is independent of temperature and can be used as a proxy for humidity.…”