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- Title
Reconciling South American Monsoon and paleo-environmental reconstructions from the last deglaciation.
- Authors
Novello, Valdir; Cruz, Francisco; McGlue, Michael; Wong, Corinne; Ward, Brittany; Vuille, Mathias; Santos, Rudney; Jaqueto, Plinio; Pessenda, Luiz; Atorre, Tiago; Ribeiro, Ligia; Karmann, Ivo; Barreto, Eline; Cheng, Hai; Edwards, R. Lawrence; Paula, Marcos
- Abstract
Stable isotope records from western and southeastern tropical South America document wet conditions during the last glacial, in contrast to a dry early-middle Holocene. However, biological proxies such as pollen and algal records from sites in the southern Amazon Basin, point to vegetation that reflects dry conditions during the last glacial period. Here we use a multi-proxy approach, utilizing δ18O, δ13C and 87Sr/86Sr in stalagmites together with XRF-derived elemental chemistry, δ13Corg total organic and inorganic carbon in a sedimentary profile from the same cave where the stalagmites were collected to clarify the climate and environmental shifts that occurred between the LGM and Holocene in central South America. We show that vegetation was sparse during the last glacial period despite a strong monsoon, and that changes in atmospheric CO2 and temperature were the possible drivers for vegetation development during this time.
- Subjects
SOUTH America; ATMOSPHERIC temperature; GLACIATION; MONSOONS; STABLE isotopes; STALACTITES &; stalagmites; GLACIAL melting
- Publication
Geophysical Research Abstracts, 2019, Vol 21, p1
- ISSN
1029-7006
- Publication type
Article