@article{fdi:010082004,
  title = {{I}sotopic equilibrium between precipitation and water vapor in northern {P}atagonia and its consequences on delta 18{O} cellulose estimate},
  author = {{P}enchenat, {T}. and {V}imeux, {F}ran{\c{c}}oise and {D}aux, {V}. and {C}attani,{O}. and {V}iale, {M}. and {V}illalba, {R}. and {S}rur, {A}. and {O}utrequin, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}odeling work of the isotopic composition of tree ring cellulose (delta 18{O} cell) relies on the isotopic equilibrium assumption between atmospheric water vapor and tree source water, frequently assimilated to integrated precipitation. {H}ere, we explore the veracity of this assumption based on observations collected during a field campaign in {R}ío {N}egro province ({A}rgentina) in {F}ebruary-{M}arch 2017. {W}e examine how the observed isotopic composition of water vapor deviates from equilibrium with precipitation. {T}his deviation, named isotopic disequilibrium (delta 18{O}vap_eq), is low (between-2.0/00and 4.1/00) and a significant relationship is observed between the isotopic composition of water vapor and its expected value at equilibrium. {N}egative delta 18{O} vap_eq can be explained by evaporation of small raindrops (from 1% to 5% ofinitial droplet mass). {P}ositive delta18{O} vap_eq can result from vegetation transpiration with transpired water accounting for 14% to 29% to ambient water vapor. {T}he low delta18{O} vap_eq at the study site may be due to the high level of relative humidity (from 70% to 96%) favoring isotopic diffusive exchanges between the two water phases and thus promoting the isotopic equilibrium. {W}e examine the impact of the isotopic equilibrium assumption on the calculation of delta 18{O} cell. {A} perfect agreement is shown between observed and calculated delta18{O} cell provided that the isotopic composition of source water is significantly higher than the expected averaged isotopic composition of precipitation over the tree growing period.},
  keywords = {{ARGENTINE} ; {ANDES} ; {RIO} {NEGRO} {ARGENTINE} ; {PATAGONIE}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {B}iogeosciences},
  volume = {125},
  numero = {3},
  pages = {e2019{JG}005418 [18 ]},
  ISSN = {2169-8953},
  year = {2020},
  DOI = {10.1029/2019{JG}005418},
  URL = {https://www.documentation.ird.fr/hor/fdi:010082004},
}