A5030617924- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Isotope Analysis in Ecology
- Geological formations and processes
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies
- Paleontology and Stratigraphy of Fossils
- Marine Biology and Ecology Research
- Marine and coastal ecosystems
- Geological Studies and Exploration
- Marine and environmental studies
- Pleistocene-Era Hominins and Archaeology
- Mercury impact and mitigation studies
- Atmospheric and Environmental Gas Dynamics
- Education Pedagogy and Practices
- Geochemistry and Geologic Mapping
- Geophysics and Gravity Measurements
- Science and Education Research
- Archaeological and Geological Studies
- Science and Science Education
- Geological and Geophysical Studies Worldwide
- Aeolian processes and effects
- Groundwater and Isotope Geochemistry
- Pacific and Southeast Asian Studies
- earthquake and tectonic studies
Universidade de São Paulo
2023-2025
Universidade Federal de Minas Gerais
2024
Universidade Federal Fluminense
2013-2023
International Ocean Discovery Program
2017
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...
The Brazil Current (BC) is a relevant feature in the Atlantic Meridional Overturning Circulation (AMOC). Its behavior during slowdown or intense AMOC remains poorly known because of lack paleoceanographic records, especially for Holocene. Here, we investigate changes western boundary upwelling system (Cabo Frio, off Southeastern Brazil) which are driven by variations BC and NE winds last 9 kyr. To assess variability BC, used δ 18 O, Mg/Ca, assemblages planktonic foraminifera. Our results...
Abstract Specific previous interglacial periods showed millennial‐scale climate variability that influenced deep water formation and circulation. However, our understanding about the spread of waters formed in North Atlantic throughout South during remains limited. To reconstruct geometry Meridional Overturning Circulation (AMOC) differences between Last Interglacial (LIG) Holocene, we present new authigenic neodymium isotope (ℇ Nd ) sortable silt (SS) records from middepth western Atlantic....
Abstract Tropical South American hydroclimate sustains the world’s highest biodiversity and hundreds of millions people. Whitin this region, Amazonia northeastern Brazil have attracted much attention due to their high biological social vulnerabilities climate change (i.e. considered hotspots). Still, future response remains uncertain. On precession timescale, it has been suggested that periods decreased western Amazonian precipitation were accompanied by increased Brazilian vice-versa,...
Abstract Magnetic signals in deep‐sea sediments have the potential to unravel past continental environmental changes, via changes primary terrigenous magnetic supply, but also record marine conditions, situ formation of secondary minerals, particularly when complemented by independent proxies. By combining environmagnetic, geochemical, and siliciclastic grain size data, we investigated sediment core GL‐1090 (24.92°S, 42.51°W, 2,225 m water depth) aiming input bottom conditions during last...
Abstract In the southern Indian Ocean, position of subtropical front – boundary between colder, fresher waters to south and warmer, saltier north has a strong influence on upper ocean hydrodynamics biogeochemistry. Here we analyse sedimentary record from Agulhas Plateau, located close modern use alkenones coccolith assemblages reconstruct oceanographic conditions over past 300,000 years. We identify glacial-interglacial variability in sea surface temperature productivity associated with...
Abstract Pronounced changes in the deep Atlantic circulation occurred during glacial stages, which affected global carbon distribution and biogeochemical cycles of other elements. Previous studies demonstrated that oceanic mercury is sensitive to same kind processes affect cycle glacial–interglacial time scales. We used Hg isotopes elucidate cycling last two transitions subtropical western South Atlantic. Mass-dependent fractionation (MDF, δ202Hg) mass-independent (MIF, Δ199Hg) show...
Abstract Intensification of the Agulhas Leakage (AL) during glacial terminations has long been proposed as a necessary mechanism for reverting Atlantic Meridional Overturning Circulation (AMOC) to its interglacial mode. However, lack records showing downstream evolution AL signal and substantial temporal differences between intensification resumption deep‐water convection have cast doubt on importance this AMOC. Here, we analyze combination new previously published data relating...
Abstract After glacial terminations, large amounts of heat and salt were transferred from low to high latitudes, which is a crucial phenomenon for the reestablishment Atlantic Meridional Overturning Circulation (AMOC). However, how different terminations evolved in (sub)tropics still poorly documented. Here we use foraminifera oxygen (δ 18 O) carbon 13 C) stable isotopes show that North piracy, following AMOC resumption at early Last Interglacial, affected thermocline δ O levels subtropical...