Martin L. C. P., Blard P. H., Lave J., Condom Thomas, Premaillon M., Jomelli V., Brunstein D., Lupker M., Charreau J., Mariotti V., Tibari B., Davy E., ASTER Team. (2018). Lake Tauca highstand (Heinrich Stadial 1a) driven by a southward shift of the Bolivian High. Science Advances, 4 (8), art. no eaar2514 [10 p.]. ISSN 2375-2548.
Titre du document
Lake Tauca highstand (Heinrich Stadial 1a) driven by a southward shift of the Bolivian High
Année de publication
2018
Auteurs
Martin L. C. P., Blard P. H., Lave J., Condom Thomas, Premaillon M., Jomelli V., Brunstein D., Lupker M., Charreau J., Mariotti V., Tibari B., Davy E., ASTER Team
Source
Science Advances, 2018,
4 (8), art. no eaar2514 [10 p.] ISSN 2375-2548
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.
Plan de classement
Sciences du milieu [021]
;
Hydrologie [062]
;
Géologie et formations superficielles [064]
Description Géographique
BOLIVIE
Localisation
Fonds IRD [F B010073989]
Identifiant IRD
fdi:010073989
