A5006500297- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Geological formations and processes
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Geological and Geophysical Studies
- Paleontology and Stratigraphy of Fossils
- Geochemistry and Elemental Analysis
- Geochemistry and Geologic Mapping
- Marine and coastal ecosystems
- Pleistocene-Era Hominins and Archaeology
- Climate variability and models
- Marine Biology and Ecology Research
- Groundwater and Isotope Geochemistry
- Fish biology, ecology, and behavior
- Geomagnetism and Paleomagnetism Studies
- Geological and Geochemical Analysis
- Archaeology and ancient environmental studies
- Geological Modeling and Analysis
- Microbial Community Ecology and Physiology
- Oceanographic and Atmospheric Processes
- Geological and Tectonic Studies in Latin America
- Amazonian Archaeology and Ethnohistory
- Geography and Environmental Studies
Universidade de São Paulo
2016-2025
Universidade Cidade de São Paulo
2015-2024
Hospital Universitário da Universidade de São Paulo
2014-2020
University of Bremen
2006-2012
National Institute for Space Research
2009-2010
Abstract The origin of modern disjunct plant distributions in the Brazilian Highlands with strong floristic affinities to distant montane rainforests isolated mountaintops northeast and northern Amazonia Guyana Shield remains unknown. We tested hypothesis that these unexplained biogeographical patterns reflect former ecosystem rearrangements sustained by widespread migrations possibly due climatic are very dissimilar from present-day conditions. To address this issue, we mapped presence...
Numerous studies use major element concentrations measured on continental margin sediments to reconstruct terrestrial climate variations. The choice and interpretation of proxies however differ from site site. Here we map the elements (Ca, Fe, Al, Si, Ti, K) in Atlantic surface (36°N–49°S) assess factors influencing geochemistry hemipelagic potential elemental ratios different regimes. High terrigenous low Ca along African South American margins reflect dominance input these regions. Single...
Changes in deep ocean ventilation are commonly invoked as the primary cause of lower glacial atmospheric CO2. The water mass structure Atlantic Ocean and mechanism by which it may have sequestered carbon remain elusive. Here we present neodymium isotope measurements from cores throughout that reveal glacial-interglacial changes distributions. These results demonstrate sustained production North Deep Water under conditions, indicating southern-sourced waters were not spatially extensive...
Abstract Changes in heat transport associated with fluctuations the strength of Atlantic meridional overturning circulation (AMOC) are widely considered to affect position Intertropical Convergence Zone (ITCZ), but temporal immediacy this teleconnection has date not been resolved. Based on a high‐resolution marine sediment sequence over last deglaciation, we provide evidence for synchronous and near‐linear link between changes interhemispheric sea surface temperature difference continental...
Abstract A substantial strengthening of the South American monsoon system (SAMS) during Heinrich Stadials (HS) points toward decreased cross‐equatorial heat transport as main driver monsoonal hydroclimate variability at millennial time scales. In order to better constrain exact timing and internal structure HS1 over tropical America, we assessed two precisely dated speleothem records from central‐eastern northeastern Brazil in combination with marine terrestrial organic inorganic matter...
Abstract. The mid-Holocene (6000 calibrated years before present) is a key period in palaeoclimatology because incoming summer insolation was lower than during the late Holocene Southern Hemisphere, whereas opposite happened Northern Hemisphere. However, effects of decreased austral over South American climate have been poorly discussed by palaeodata syntheses. In addition, only few regional studies characterised America through multiproxy approach. Here, we present compilation palaeoclimate...
Abstract. We investigate changes in the delivery and oceanic transport of Amazon sediments related to terrestrial climate variations over last 250 ka. present high-resolution geochemical records from four marine sediment cores located between 5 12° N along northern South American margin. The River is sole source terrigenous material for sites at 9° N, while core receives a mixture Orinoco detrital particles. Using an endmember unmixing model, we estimated relative proportions Andean...
Abstract By exchanging huge amounts of heat between the tropics and high latitudes, subtropical gyres significantly impact Earth's energy balance. Yet, their dynamical changes during last deglaciation remain poorly understood. Here, nine records planktonic foraminiferal species Globorotalia truncatulinoides , that inhabits permanent deep thermocline gyres, are used to explore meridional migration both North South Atlantic (NASG SASG, respectively) in past 22,000 years. We find migrated...
The South American summer monsoon (SASM) is the main source of precipitation for most densely populated and agriculturally productive regions tropical subtropical America. Here we investigate impact Atlantic Multidecadal Oscillation (AMO) on SASM using ∼4500 yr long proxy records discharge variability La Plata River Drainage Basin (PRDB), We measured stable oxygen composition planktic foraminifera (related to extension PRDB plume), Ti intensity in bulk sediment terrigenous sediments) from a...
We present a species‐specific Mg/Ca‐calcification temperature calibration for Globorotalia inflata from suite of 38 core top samples the South Atlantic (from 8°S to 49°S). G. is deep‐dwelling planktonic foraminifer commonly occurring in subtropical subpolar conditions, which qualifies it reconstructions permanent thermocline. Apparent calcification depths and temperatures were determined by comparing measured δ 18 O with equilibrium calcite based on water column properties. Based our...
Abstract The continental margin off the La Plata Estuary (SE South America) is characterized by high fluvial sediment supply and strong ocean currents. High-resolution sediment-acoustic data combined with sedimentary facies analysis, AMS- 14 C ages, neodymium isotopic allowed us to reconstruct late Quaternary dynamics in relation two major sources, Argentine margin. Sediments from these provinces show completely different dispersal patterns. We that northward-trending paleo-valley was sole...
Abstract The southern westerly winds (SWW) exert a crucial influence over the world ocean and climate. Nevertheless, comprehensive understanding of Holocene temporal spatial evolution SWW remains significant challenge due to sparsity high‐resolution marine archives appropriate proxies. Here we present north‐south transect planktonic foraminiferal oxygen isotope records from western South Atlantic. Our proxy reveal migrations Brazil‐Malvinas Confluence (BMC), highly sensitive feature for...
Abstract Surface ocean circulation in the western equatorial Atlantic is mainly wind driven and plays a major role for transport of warm waters to North Atlantic. Past changes strength direction trade winds are well documented, but response water column structure these unclear. Here we used difference between stable isotopic oxygen composition two species planktonic foraminifera ( Globigerinoides ruber white Neogloboquadrina dutertrei ) from sediment cores collected off northeastern Brazil...
Abstract Although the global environmental impact of Laurentide Ice-Sheet destabilizations on glacial climate during Heinrich Events is well-documented, mechanism driving these ice-sheet instabilities remains elusive. Here we report foraminifera-based subsurface (~150 m water depth) ocean temperature and salinity reconstructions from a sediment core collected in western subpolar North Atlantic, showing consistent pattern rapid warming preceding transition into each Event identified same last...