A5021429319- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Marine Biology and Ecology Research
- Paleontology and Stratigraphy of Fossils
- Maritime Transport Emissions and Efficiency
- Atmospheric and Environmental Gas Dynamics
- Hydrocarbon exploration and reservoir analysis
- Pleistocene-Era Hominins and Archaeology
- Fish biology, ecology, and behavior
- Archaeological and Geological Studies
- Marine and coastal ecosystems
- Geomagnetism and Paleomagnetism Studies
- Reservoir Engineering and Simulation Methods
- Geological and Geophysical Studies
- Drilling and Well Engineering
- Marine and Offshore Engineering Studies
- Evolution and Paleontology Studies
- Geological Studies and Exploration
- Diatoms and Algae Research
- Oceanographic and Atmospheric Processes
- Hydrological Forecasting Using AI
- Coastal wetland ecosystem dynamics
- Hydraulic Fracturing and Reservoir Analysis
Universidade Federal do Rio Grande do Sul
2010-2024
Instituto de Geociencias
2008-2024
University of Rio Grande and Rio Grande Community College
2023
Pontifícia Universidade Católica do Rio Grande do Sul
2013
Universidade de São Paulo
2006-2013
Centro de Pesquisas Oncológicas
2013
Continental (Canada)
2010
Orbital Systems (Sweden)
2010
Universidade Brasil
2006
Universidade Federal do Rio Grande
2000-2001
Abstract Ocean warming related to climate change has been proposed cause the dissociation of gas hydrate deposits and methane leakage on seafloor. This process occurs in places where edge stability zone sediments meets overlying warmer oceans upper slope settings. Here we present new evidence based analysis a large multi-disciplinary multi-scale dataset from such location western South Atlantic, which records massive release ocean. The results provide unique opportunity examine ocean-hydrate...
The vast oxygen-depleted area of the central Baltic Sea is largest human-induced dead zone in world with 70,000 km2 or approximately three times second one Gulf Mexico. Methane occurs high concentrations bottom waters (3200 nM) and sediments (30 mM), its dynamics better constrained for water column, but still poorly understood on sediments. Here we show that sediment accumulation rate plays a major role regulating quantity organic matter residence time sulphate reduction methanogenesis zones...
The Amazon River culminates in one a deep-sea fan up to 10 km thick, dynamic setting which the rapid deposition of organic-rich sediment drives linked processes methanogenesis, fluid migration and venting, gas hydrate formation, large-scale slope instability. Growth over last 8 Ma has been accompanied by its gravitational collapse on shale detachments form extensional compressional belts across shelf upper (96%) are
Abstract Factors intrinsic to foraminiferal tests result in different degrees of susceptibility dissolution. Differential resistance dissolution among planktonic foraminifera has been studied several regions, but no previous work reported for the western South Atlantic. The goal this research was develop a ranking from Atlantic Ocean, compare solubility between benthic and foraminifera, evaluate changes oxygen isotopic signal (δ18O) associated with Two experiments were carried out by...
Gas hydrate provinces occur in two sedimentary basins along Brazil’s continental margin: (1) The Rio Grande Cone the southeast, and (2) Amazon deep-sea fan equatorial region. occurrence of gas hydrates these depocenters was first detected geophysically has recently been proven by seafloor sampling vents, as water column acoustic anomalies rising from depressions (pockmarks) and/or mounds, many associated with faults formed gravitational collapse both depocenters. vents include typical...
Deep-sea fans have been proposed to act as carbon sinks, rapid deposition driving shallow methanogenesis favor net storage within the gas hydrate stability zone (GHSZ). Here, we present new evidence of widespread venting from GHSZ on upper Amazon deep-sea fan, together with analyses first samples hydrates recovered offshore NE Brazil. Multibeam water column and seafloor imagery over an 18,000-km2 area fan reveal 53 plumes, rising features in depths 650–2600 m. Most vents (60%) are located...
Abstract Planktonic Foraminifera are widely used in paleoceanographic reconstructions, although studies of their trophic interactions still rare, especially those focusing on predation. Drilling holes the most frequent traces bioerosion foraminifer tests, but environmental factors that control not yet understood. To determine if variables associated with rates late Quaternary planktonic foraminifers western South Atlantic, geochemical and assemblage analyses were made a 46 kyr record from...
Changes in the oxygen isotopic composition of planktonic foraminifer Globigerinoides ruber and foraminifera faunal a core retrieved from southeastern Brazilian continental margin were used to infer past changes hydrological balance monsoon precipitation western South Atlantic since Last Glacial Maximum (LGM).The results suggest first-order orbital (precessional) control on American Monsoon precipitation.This agrees with previous studies based proxies except for LGM estimates provided by...
This work reconstructs Late Quaternary paleoceanographic changes in the western South Atlantic Ocean based on sedimentary core GL-77, recovered from lower continental slope Campos basin, off shore SE Brazil.The studied interval comprises last 130 ka.Changes sea surface temperature (SST) and paleoproductivity were estimated using total planktonic foraminiferal fauna oxygen isotope analyses.The age model was record, biostratigraphic datums AMS 14 C dating.It observed that Pleistocene/Holocene...
Research Article| March 12, 2018 SURVIVING IN THE WATER COLUMN: DEFINING TAPHONOMICALLY ACTIVE ZONE PELAGIC SYSTEMS SANDRO MONTICELLI PETRÓ; PETRÓ 1Programa de Pós-Graduação em Geociências, Instituto Universidade Federal do Rio Grande Sul, CEP 91.501-970, C.P. 15001, Porto Alegre, Brazil Search for other works by this author on: GSW Google Scholar MATIAS DO NASCIMENTO RITTER; RITTER MARÍA ALEJANDRA GÓMEZ PIVEL; PIVEL 2Departamento Paleontologia e Estratigrafia, JOÃO CARLOS COIMBRA Author and...
Studies reconstructing surface paleoproductivity and benthic environmental conditions allow us to measure the effectiveness of biological pump, an important mechanism in global climate system. In order assess productivity changes their effect on seafloor, we studied sediment core SAT-048A, spanning 43–5 ka, recovered from continental slope (1,542 m water depth) southernmost Brazilian margin, deep western South Atlantic. We assessed sea productivity, organic matter flux calcite dissolution...
In this study we have compared the oxygen isotopic composition of two genera benthic foraminifera (Uvigerina and Cibicidoides) from core-top samples with modern seawater (delta18O). Based on a new relationship between delta18O salinity for mid-latitude western South Atlantic, estimated equilibrium calcite (delta18Oeq) using different equations: (1) O'Neil et al. (1969), modified by McCorkle (1997) (2) Kim & (1997). When (1), small difference delta18Oeq Uvigerina suggests that genus...
The last glacial inception was characterised by rapid changes in temperature, atmospheric pCO 2 , and the water mass geometry of major ocean basins. Although several climatic feedback mechanisms have been proposed to explain glacial/interglacial cycles witnessed Quaternary, exact mechanistic responses these processes are still under constrained. In this study we use proxies including planktonic foraminifera compositional assemblages oxygen stable isotopes reconstruct past sea surface...