@article{fdi:010084396,
  title = {{H}ydroclimate and {ENSO} variability recorded by oxygen isotopes from tree rings in the {S}outh {A}merican {A}ltiplano},
  author = {{R}odriguez-{C}aton, {M}. and {A}ndreu-{H}ayles, {L}. and {D}aux, {V}. and {V}uille, {M}. and {V}aruolo-{C}larke, {A}. {M}. and {O}elkers, {R}. and {C}hristie, {D}. {A}. and {D}'{A}rrigo, {R}. and {M}orales, {M}. {S}. and {R}ao, {M}. {P}. and {S}rur, {A}. {M}. and {V}imeux, {F}ran{\c{c}}oise and {V}illalba, {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{H}ydroclimate variability in tropical {S}outh {A}merica is strongly regulated by the {S}outh {A}merican {S}ummer {M}onsoon ({SASM}). {H}owever, past precipitation changes are poorly constrained due to limited observations and high-resolution paleoproxies. {W}e found that summer precipitation and the {E}l {N}ino-{S}outhern {O}scillation ({ENSO}) variability are well registered in tree-ring stable oxygen isotopes (delta {O}-18({TR})) of {P}olylepis tarapacana in the {C}hilean and {B}olivian {A}ltiplano in the {C}entral {A}ndes (18-22 degrees {S}, similar to 4,500 m a.s.l.) with the northern forests having the strongest climate signal. {M}ore enriched delta {O}-18({TR}) values were found at the southern sites likely due to the increasing aridity toward the southwest of the {A}ltiplano. {T}he climate signal of {P}. tarapacana delta {O}-18({TR}) is the combined result of moisture transported from the {A}mazon {B}asin, modulated by the {SASM}, {ENSO}, and local evaporation, and emerges as a novel tree-ring climate proxy for the southern tropical {A}ndes. {P}lain {L}anguage {S}ummary {U}nderstanding past climatic changes in the {C}entral {A}ndes in tropical {S}outh {A}merica is of great importance to contextualize current hydroclimatic conditions. {H}ere, we present the first {P}. tarapacana tree-ring stable oxygen isotope (delta {O}-18({TR})) chronologies and analyze their value as environmental records for this region. {L}ocally known as quelioa, {P}. tarapacana grows in the {S}outh {A}merican {A}ltiplano from 16 degrees {S} to 23 degrees {S} at very high elevations (up to 5,100 m a.s.l), making it the highest elevation tree species worldwide. {W}e analyze {P}. tarapacana delta {O}-18({TR}) from 1950 to present and find that it registers precipitation changes in the {A}ltiplano and the {E}l {N}ino - {S}outhern {O}scillation ({ENSO}). {W}e suggest that delta {O}-18({TR}) is likely affected by soil evaporation and leaf transpiration due to the high solar radiation and aridity in the {A}ltiplano, leading to an enrichment in delta {O}-18({TR}) values with a more pronounced effect at the more arid sites. {P} tarapacana delta {O}-18({TR}) reflects the atmospheric processes transporting moisture to the {A}ltiplano and the influence of local evaporation. {O}ur findings are relevant for generating robust hydroclimate reconstructions in the {C}entral {A}ndes to improve circulation models and provide better management of water resources in tropical {S}outh {A}merica.},
  keywords = {{CHILI} ; {BOLIVIE} ; {ZONE} {TROPICALE} ; {ANDES}},
  booktitle = {},
  journal = {{G}eophysical {R}esearch {L}etters},
  volume = {49},
  numero = {4},
  pages = {e2021{GL}095883 [11 p.]},
  ISSN = {0094-8276},
  year = {2022},
  DOI = {10.1029/2021gl095883},
  URL = {https://www.documentation.ird.fr/hor/fdi:010084396},
}