Lake tauca highstand (heinrich stadial 1a) driven by a southward shift of the bolivian high

Open access
Author
Martin, Léo C.P.
Blard, Pierre H.
Lavé, Jérôme
Condom, Thomas
Prémaillon, Mélody
Jomelli, Vincent
Brunstein, Daniel
Lupker, Maarten
Charreau, Julien
Mariotti, Véronique
Tibari, Bouchaïb
ASTER Team
Davy, Emmanuel
Date
2018-08-01Type
- Journal Article
Abstract
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 HS1a 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. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000287946Publication status
publishedJournal / series
Science AdvancesVolume
Pages / Article No.
Publisher
American Association for the Advancement of Science (AAAS)Organisational unit
03868 - Eglinton, Timothy I. / Eglinton, Timothy I.
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