@article{fdi:010092559,
  title = {{U}nderstanding the 17 0 excess glacial-interglacial variations in {V}ostok precipitation},
  author = {{R}isi, {C}. and {L}andais, {A}. and {B}ony, {S}. and {J}ouzel, {J}. and {M}asson-{D}elmotte, {V}. and {V}imeux, {F}ran{\c{c}}oise},
  editor = {},
  language = {{ENG}},
  abstract = {{C}ombined measurements of delta {O}-18, delta {O}-17, and delta {D} in ice cores, leading to d excess and {O}-17 excess, are expected to provide new constraints on the water cycle and past climates. {W}e explore different processes, both in the source regions and during the poleward transport, that could explain the {O}-17 excess increase by 20 per meg observed from the {L}ast {G}lacial {M}aximum ({LGM}) to {E}arly {H}olocene ({EH}) at the {V}ostok station. {U}sing a single-column model over tropical and subtropical oceans, we show that the relative humidity at the surface is the main factor controlling {O}-17 excess in source regions. {T}hen, using a {R}ayleigh-type model, we show that the {O}-17 excess signal from the source region is preserved in the polar snowfall, contrary to d excess. {E}vaporative recharge over mid and high latitudes and delta {O}-18 seasonality in polar regions can also affect the {V}ostok {O}-17 excess but cannot account for most of the 20 per meg deglacial increase from {LGM} to {EH}. {O}n the other hand, a decrease of the relative humidity at the surface (rh(s)) by 8 to 22% would explain the observed change in {O}-17 excess. {S}uch a change would not necessarily be incompatible with a nearly unchanged boundary layer relative humidity, if the surface thermodynamic disequilibrium decreased by 4 degrees {C}. {S}uch a change in rh(s) would affect source and polar temperatures reconstructions from delta {O}-18 and d excess measurements, strengthening the interest of {O}-17 excess measurements to better constrain such changes.},
  keywords = {},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch-{A}tmospheres},
  volume = {115},
  numero = {},
  pages = {en ligne [15 ]},
  ISSN = {0148-0227},
  year = {2010},
  DOI = {10.1029/2008jd011535},
  URL = {https://www.documentation.ird.fr/hor/fdi:010092559},
}