@InProceedings{CamposCPMKPVACB:2019:NeInAb,
author = "Campos, Mar{\'{\i}}lia de Carvalho and Chiessi, Cristiano M. and
Prange, Matthias and Mulitza, Stefan and Kuhnert, Henning and
Paul, Andre and Venancio, Igor Martins and Albuquerque, Ana Luiza
and Cruz, Francisco William and Bahr, Andr{\'e}",
affiliation = "{Universidade de S{\~a}o Paulo (USP)} and {Universidade de
S{\~a}o Paulo (USP)} and {University of Bremen} and {University
of Bremen} and {University of Bremen} and {University of Bremen}
and {Instituto Nacional de Pesquisas Espaciais (INPE)} and
{Universidade Federal Fluminense (UFF)} and {Universidade de
S{\~a}o Paulo (USP)} and {University of Heidelberg}",
title = "New insights about millennial-scale positive precipitation
anomalies over tropical South America",
year = "2019",
organization = "AGU Fall Meeting",
abstract = "Heinrich Stadials (HS) are cold Northern Hemisphere abrupt
millennial-scale events frequently related to decreases in the
strength of the Atlantic meridional overturning circulation
(AMOC). Model simulations and paleoclimate records indicate that
the reduction in oceanic heat transport to the Northern Hemisphere
during periods of weak AMOC cools down the North Atlantic and
warms up the South Atlantic. This perturbation in the
cross-equatorial heat transport would in turn affect tropical
rainfall. Indeed, South American hydroclimate records indicate
marked precipitation anomalies during HS of the last glacial
period. However, the scarcity of high-resolution marine records
off South America, especially between 7 and 20°S, hampers a
mechanistic understanding of tropical South American hydroclimate
responses to HS. Here we investigate piston core M125-95-3
collected at 10.95°S from a site influenced by the terrigenous
discharge of the S{\~a}o Francisco River, eastern South America,
for the last ca. 70,000 years. In order to reconstruct changes in
precipitation over the S{\~a}o Francisco River drainage basin we
determined the major elemental composition along the piston core.
To gain mechanistic insights into tropical South American
hydroclimate changes we analyzed a HS-simulation with a
high-resolution version of the atmosphere-ocean general
circulation model CCSM3. Our new elemental record shows marked
increases in S{\~a}o Francisco River sediment discharge to the
eastern South Atlantic during HS. It is the southernmost marine
paleoclimate record off eastern South America that unequivocally
records the HS of the last glacial period. Additionally, our
high-resolution model output allows new insights into the drivers
of changes in South American hydroclimate during HS.",
conference-location = "San Francisco, CA",
conference-year = "09-13 dec.",
language = "en",
targetfile = "campos_new.pdf",
urlaccessdate = "15 jun. 2024"
}