@article{fdi:010064760,
  title = {{I}mpact of {B}olivian paleolake evaporation on the delta {O}-18 of the {A}ndean glaciers during the last deglaciation (18.5-11.7 ka) : diatom-inferred delta {O}-18 values and hydro-isotopic modeling},
  author = {{Q}uesada, {B}. and {S}ylvestre, {F}lorence and {V}imeux, {F}ran{\c{c}}oise and {B}lack, {J}essica and {P}ailles, {C}. and {S}onzogni, {C}. and {A}lexandre, {A}. and {B}lard, {P}. {H}. and {T}onetto, {A}. and {M}azur, {J}. {C}. and {B}runeton, {H}.},
  editor = {},
  language = {{ENG}},
  abstract = {{D}uring the last deglaciation, the {B}olivian {A}ltiplano (15-23 degrees {S}, 66-70 degrees {W}) was occupied by paleolake {T}auca covering, at least, similar to 51,000 km(2) at its maximum highstand between 16.5 and 15 ka. {T}wenty-five hundred years later, after a massive regression, a new transgressive phase, produced paleolake {C}oipasa, smaller than {T}auca and restricted to the southern part of the basin. {T}hese paleolakes were overlooked at the west by the {S}ajama ice cap. {T}he latter provides a continuous record of the oxygen isotopic composition of paleo-precipitation for the last 25 ka. {C}ontemporaneously to the end of paleolake {T}auca, around 14.3 ka, the {S}ajama ice cap recorded a significant increase in ice oxygen isotopic composition (delta {O}-18(ice)). {T}his paper examines to what extent the disappearance of {L}ake {T}auca contributed to precipitation on the {S}ajama summit and this specific isotopic variation. {T}he water delta {O}-18 values of paleolakes {T}auca and {C}oipasa (delta {O}-18(lake)) were quantitatively reconstructed from 18.5 to 11.7 ka based on diatom isotopic composition (delta {O}-18(diatoms)) and ostracod isotopic composition (delta {O}-18(carbonates)) retrieved in lacustrine sediments. {A}t a centennial time scale, a strong trend appears: abrupt decreases of delta {O}-18(lake) during lake fillings are immediately followed by abrupt increases of delta {O}-18(lake) during lake level stable phases. {T}he highest variation occurred at similar to 15.8 ka with a delta {O}-18(lake) decrease of about similar to 10%o, concomitant with the {L}ake {T}auca highstand, followed similar to 400 years later by a 7 parts per thousand increase in delta {O}-18(lake). {A} simple hydro-isotopic modeling approach reproduces consistently this rapid "decrease-increase" feature. {M}oreover, it suggests that this unexpected re-increase in delta {O}-18(lake) after filling phases can be partly explained by an equilibration of isotopic fluxes during the lake steady-state. {B}ased on isotopic calculations during lake evaporation and a simple water stable isotopes balance between potential moisture sources at {S}ajama (advection versus lake evaporation), we show that total or partial evaporation (from 5 to 60%) of paleolake {T}auca during its major regression phase at 14.3 ka could explain the pronounced isotopic excursion at {S}ajama ice cap. {T}hese results suggest that perturbations of the local hydrological cycle in lacustrine areas may substantially affect the paleoclimatic interpretation of the near-by isotopic signals (e.g. ice core or speleothems).},
  keywords = {{B}olivian {A}ltiplano ; {D}eglaciation ; {P}aleolakes ; {A}ndean ice cores ; {D}iatoms ; {O}stracods ; {O}xygen isotopes ; {BOLIVIE} ; {ANDES}},
  booktitle = {},
  journal = {{Q}uaternary {S}cience {R}eviews},
  volume = {120},
  numero = {},
  pages = {93--106},
  ISSN = {0277-3791},
  year = {2015},
  DOI = {10.1016/j.quascirev.2015.04.022},
  URL = {https://www.documentation.ird.fr/hor/fdi:010064760},
}