%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Martin, L. C. P.
%A Blard, P. H.
%A Lave, J.
%A Condom, Thomas
%A Premaillon, M.
%A Jomelli, V.
%A Brunstein, D.
%A Lupker, M.
%A Charreau, J.
%A Mariotti, V.
%A Tibari, B.
%A Davy, E.
%A ASTER Team
%T Lake Tauca highstand (Heinrich Stadial 1a) driven by a southward shift of the Bolivian High
%D 2018
%L fdi:010073989
%G ENG
%J Science Advances
%@ 2375-2548
%K BOLIVIE
%K TAUCA LAC
%M ISI:000443498100010
%N 8
%P art. no eaar2514 [10 ]
%R 10.1126/sciadv.aar2514
%U https://www.documentation.ird.fr/hor/fdi:010073989
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers18-09/010073989.pdf
%V 4
%W Horizon (IRD)
%X Heinrich events are characterized by worldwide climate modifications. Over the Altiplano endorheic basin (high tropical Andes), the second half of Heinrich Stadial 1 (HS1a) was coeval with the highstand of the giant paleolake Tauca. However, the atmospheric mechanisms underlying this wet event are still unknown at the regional to global scale. We use cosmic-ray exposure ages of glacial landforms to reconstruct the spatial variability in the equilibrium line altitude of the HS1 a Altiplano glaciers. By combining glacier and lake modeling, we reconstruct a precipitation map for the HS1a period. Our results show that paleoprecipitation mainly increased along the Eastern Cordillera, whereas the southwestern region of the basin remained relatively dry. This pattern indicates a southward expansion of the easterlies, which is interpreted as being a consequence of a southward shift of the Bolivian High. The results provide a new understanding of atmospheric teleconnections during HS1 and of rainfall redistribution in a changing climate.
%$ 062 ; 021 ; 064