Journal
SCIENCE ADVANCES
Volume 4, Issue 8, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aar2514
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Funding
- INSU EVE-LEFE (Institut National des Sciences de l'Univers Evolution et Variabilite du climat a l'Echelle globale-Les Enveloppes Fluides et l'Environnement) program
- Agence Nationale de la Recherche (ANR) Jeunes Chercheurs GALAC (GlAciers et LACs de l'Altiplano) project [ANR-11-JS56-011-01]
- INSU/CNRS
- ANR through Equipements d'Excellence program
- IRD
- Commissariat a l'Energie Atomique et aux Energies Alternatives
- French IRD
- Universidad Mayor de San Andres [IGEMA (Investigaciones Geologicas y del Medio Ambiente)] in Bolivia
- Universidad Mayor de San Andres [IHH (Instituto de Hidraulica e Hidrologia)] in Bolivia
- Insituto Nacional de Meteorologia e Hidrologia in Ecuador
- International Joint Laboratory GREAT-ICE (Glaciers et Ressources en Eau des Andes Tropicales-Indicateurs Climatiques et Environnementaux)
- LabEx OSUG@2020 (ANR) [ANR-10-LABX-56]
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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.
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