@article{fdi:010053700,
  title = {{A} strong control of the {S}outh {A}merican {S}ee{S}aw on the intra-seasonal variability of the isotopic composition of precipitation in the {B}olivian {A}ndes},
  author = {{V}imeux, {F}ran{\c{c}}oise and {T}remoy, {G}. and {R}isi, {C}. and {G}allaire, {R}obert},
  editor = {},
  language = {{ENG}},
  abstract = {{W}ater stable isotopes (delta) in tropical regions are a valuable tool to study both convective processes and climate variability provided that local and remote controls on hare well known. {H}ere, we examine the intra-seasonal variability of the event-based isotopic composition of precipitation (delta {D}-{Z}ongo) in the {B}olivian {A}ndes ({Z}ongo valley, 16 degrees 20'{S}-67 degrees 47'{W}) from {S}eptember 1st, 1999 to {A}ugust 31st, 2000. {W}e show that the local amount effect is a very poor parameter to explain delta {D}-{Z}ongo. {W}e thus explore the property of water isotopes to integrate both temporal and spatial convective activities. {W}e first show that the local convective activity averaged over the 7-8 days preceding the rainy event is an important control on delta {D}-{Z}ongo during the rainy season (similar to 40% of the delta {D}-{Z}ongo variability is captured). {T}his could be explained by the progressive depletion of local water vapor by unsaturated downdrafts of convective systems. {T}he exploration of remote convective controls on delta {D}-{Z}ongo shows a strong influence of the {S}outh {A}merican {S}ee{S}aw ({SASS}) which is the first climate mode controlling the precipitation variability in tropical {S}outh {A}merica during austral summer. {O}ur study clearly evidences that temporal and spatial controls are not fully independent as the 7-day averaged convection in the {Z}ongo valley responds to the {SASS}. {O}ur results are finally used to evaluate a water isotope enabled atmospheric general circulation model ({LMDZ}-iso), using the stretched grid functionality to run zoomed simulations over the entire {S}outh {A}merican continent (15 degrees {N}-55 degrees {S}; 30 degrees-85 degrees {W}). {W}e find that zoomed simulations capture the intra-seasonal isotopic variation and its controls, though with an overestimated local sensitivity, and confirm the role of a remote control on delta according to a {SASS}-like dipolar structure.},
  keywords = {water stable isotopes ; precipitation ; {B}olivia ; convective activity ; {S}outh {A}merican {S}ee{S}aw},
  booktitle = {},
  journal = {{E}arth and {P}lanetary {S}cience {L}etters},
  volume = {307},
  numero = {1-2},
  pages = {47--58},
  ISSN = {0012-821{X}},
  year = {2011},
  DOI = {10.1016/j.epsl.2011.04.031},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053700},
}