Article
Geosciences, Multidisciplinary
Alessandro Amorosi, Luigi Bruno, Massimo Caldara, Bruno Campo, Simone Cau, Vincenzo De Santis, Andrea Di Martino, Wan Hong, Giorgio Lucci, Claudio Pellegrini, Veronica Rossi, Irene Sammartino, Stefano Claudio Vaiani
Summary: Through the analysis of onshore cores, we have gained a deeper understanding of the stratigraphic architecture and sedimentary response of late Quaternary paleovalley systems. These systems experienced erosion during the late Pleistocene, filling during the Holocene, and basinwide flooding. The sediment characteristics indicate a shift in sediment provenance from southern Apennine rocks to a mixed composition from northern sources, due to the influence of the Southeast-directed Western Adriatic Current.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Environmental Sciences
Antonella Daira Padula, Rodrigo Machado, Lucas Milmann, M. Carolina de Leon, Joaquin C. M. Gana, Janaina C. Wickert, Maria Eugenia Arganaraz, Ricardo O. Bastida, Diego H. Rodriguez, Pablo E. Denuncio
Summary: This study examined the ingestion of large marine debris in 21 odontocete species in southern Brazil and northern Argentina. Of the total individuals studied, 8% had ingested marine debris, with plastics being the most common type of debris. Seven of the nine species that had ingested marine debris had been previously observed ingesting this pollutant in other areas. Two endemic odontocetes in the Southwest Atlantic Ocean were also identified as affected organisms.
MARINE POLLUTION BULLETIN
(2023)
Article
Geosciences, Multidisciplinary
Denise Silva de Moura, Yara Regina Marangoni
Summary: In this study, a gravity survey was conducted on the lithosphere beneath three large sedimentary basins in southeastern South America. A massive gravity database was compiled and used to estimate free-air and Bouguer gravity anomalies, resulting in the creation of a comprehensive Bouguer anomaly map. Additional calculations were performed to remove the gravity effects of known lithologies from the complete Bouguer anomaly, leading to the development of a residual Bouguer anomaly map that highlights unknown anomalous masses within the lithosphere. These findings have implications for the understanding of tectonic features and the density structure in the region.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geochemistry & Geophysics
Delphine Rouby, Jing Ye, Dominique Chardon, Artiom Loparev, Mark Wildman, Massimo Dall'Asta
Summary: Despite their low relief and erosion rates, non-orogenic continental domains play a significant role in the Earth's exposed lands. In this study, the sedimentary budget of the West African cratonic domain and its rifted margin in the Equatorial Atlantic is established using various data analysis methods. The results shed light on the denudation and accumulation processes in these regions and how they are influenced by climate and drainage network changes.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Environmental Sciences
Karl J. F. Meier, Andrea Jaeschke, Janet Rethemeyer, Cristiano M. Chiessi, Ana Luiza S. Albuquerque, Vincent Wall, Oliver Friedrich, Andre Bahr
Summary: This study evaluates ocean-atmosphere feedbacks in the South American region from 19 to 4 ka, showing important mechanisms and impacts of past climate changes, especially during Heinrich Stadial 1.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Meteorology & Atmospheric Sciences
Natalia Machado Crespo, Natalia Pillar da Silva, Ronaldo Maia de Jesus Palmeira, Andressa Andrade Cardoso, Clarisse Lacerda Gomes Kaufmann, Jose Antonio Moreira Lima, Marcelo Andrioni, Ricardo de Camargo, Rosmeri Porfirio da Rocha
Summary: This study aims to evaluate the accuracy of reanalysis/satellite data in reproducing significant wave height and wind speed, and assess climate simulations over the western South Atlantic. It found that the models have more realistic representation for wind speed and significant wave height in certain areas, and that there are more intense wind and wave extremes in the austral spring and winter near the southeastern coast of Brazil.
Article
Environmental Sciences
Alain Alves Povoa, Fabio Vieira de Araujo, Luis Felipe Skinner
Summary: The presence of floating marine anthropogenic litter in marine environments increases the likelihood of fouling organisms using these substrates as a means of transportation. The study found that exposed beaches have higher density and cover of fouling, possibly due to currents, winds, and storm waves. Bryozoans, barnacles, polychaetes, and mollusks were the most common fouling groups observed in litter and could potentially contribute to the dispersal of species in the area.
MARINE POLLUTION BULLETIN
(2022)
Article
Environmental Sciences
Youpeng Wang, Dewen Li
Summary: This study investigates the Qiaojia-Jinyang segment of Lianfeng fault zone (LFZ) in Southwest China and re-determines the spatio-temporal sequence of Late-Quaternary river terraces in the area. The results indicate that LFZ is active at least at QJS, with the latest activity not earlier than the Early-Middle Holocene. These findings provide clear geological evidence for seismicity assessment in LFZ and contribute to the understanding of regional tectonic environment and earthquake disaster prevention.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Oceanography
Yamandu H. Marin, Omar Defeo, Sebastian Horta
Summary: In the Rio de la Plata and the adjacent Atlantic Ocean, there is significant environmental cooperation mainly focused on fisheries management and maritime traffic organizations. However, many other sectors are not covered by these agreements due to different jurisdictions and regulatory instruments. The diverse activities and overlapping use have caused conflicts between sectors.
OCEAN & COASTAL MANAGEMENT
(2021)
Article
Biodiversity Conservation
David E. Sabadin, Santiago A. Barbini, Daniel E. Figueroa, Luis O. Lucifora
Summary: The evaluation of representativeness of chondrichthyan biodiversity in the Southwest Atlantic revealed that current CFAs and MPAs are not providing adequate protection for these threatened vertebrates. It is suggested that conservation efforts need to be improved to achieve full representativeness, and global conservation agendas promoting big MPAs in remote seas should be integrated into regional networks to avoid unbalancing future MPA networks.
BIODIVERSITY AND CONSERVATION
(2022)
Article
Geosciences, Multidisciplinary
S. Rohais, J. P. Lovecchio, V. Abreu, M. Miguez, S. Paulin
Summary: A high-resolution sedimentary budget quantification method for the Cenozoic deposits of the Pelotas Basin was proposed in this paper, revealing cycles of sediment supply pulses and low supply phases. The study suggests that the sediment supply dynamics in the Pelotas basin are influenced by the orogenic phases of the Andes, located over 2,000 km upstream.
Article
Geology
Hanaa Deik, Lars Reuning, Margot Courtillat, Benjamin Petrick, Maria-Angela Bassetti
Summary: In recent decades, understanding of temperate carbonate systems has improved, but research on their development over glacial-interglacial timescales lags behind tropical systems. Analysis of sediment cores from Integrated Ocean Drilling Program Site U1460 off the Southwest Shelf of Australia reveals a record of sea-level controlled sedimentary cycles. The composition and texture of sediments deposited during interglacial highstands and glacial lowstands show distinct differences, suggesting regional variations in response to sea-level change.
Article
Geosciences, Multidisciplinary
C. Roque, F. J. Hernandez-Molina, P. Madureira, R. Quartau, V Magalhaes, P. Brito, J. T. Vazquez, L. Somoza
Summary: This study identifies the main geomorphologies and processes offshore Madeira Island below 3800 m water depth, shaped by the interaction between Antarctic Bottom Water, turbidity currents, and oceanic reliefs. The distribution of morphological features defines three regional geomorphological sectors.
Article
Oceanography
T. Glazkova, F. J. Hernandez-Molina, E. Dorokhova, A. Mena, C. Roque, F. J. Rodriguez-Tovar, V. Krechik, L. Kuleshova, E. Llave
Summary: Based on new sedimentological, hydrological and geophysical data, this study reveals the key sedimentary processes in the Late Quaternary. The results show the relationship between bottom current activity and terrigenous content as well as carbonate dissolution, and the variability of the Antarctic Bottom Water linked to glacial-interglacial changes.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2022)
Article
Ecology
Maria Cecilia Bonadero, Maria Victoria Laitano, Juana Cristina del Valle, Analia Veronica Fernandez-Gimenez
Summary: In this study, the specific activity of digestive enzymes in seven species of decapods was measured, and the highest activities were found in four species of crabs. The optimal temperatures for these enzymes were generally between 30 and 50 degrees C, and they showed alkaline optimal pH. The tested enzymes exhibited similar temperature and pH ranges to those used in various biotechnological processes, indicating their potential for industrial applications. Furthermore, the reuse of these enzymes from the studied species, most of which are converted into fishery residues, would contribute to the sustainability of the activity.
REGIONAL STUDIES IN MARINE SCIENCE
(2022)
Article
Geochemistry & Geophysics
D. J. Bertassoli, C. Haeggi, C. M. Chiessi, E. Schefuss, J. Hefter, T. K. Akabane, A. O. Sawakuchi
Summary: This study investigates the distribution of glycerol dialkyl glycerol tetraether (GDGT) and n-alkane isotopes in soils and sediments from the Amazon River Basin, and examines the impact of sources and transport processes on their distribution.
Article
Geography, Physical
J. Maksic, I. M. Venancio, M. H. Shimizu, C. M. Chiessi, P. Piacsek, G. Sampaio, Francisco W. Cruz, F. F. Alexandre
Summary: The Last Glacial Maximum (LGM) was characterized by atmospheric cooling, showing contrasts to the current warming climate. Research indicates that in the Western and Central Amazon forest regions, the biomes remained largely unchanged during the LGM due to negative temperature anomalies, while in the Eastern portion, a shift from tropical evergreen forest to tropical seasonal forest was observed. Future warming scenarios suggest a potential expansion of Savanna/Cerrado and a reduction of tropical seasonal forest and Caatinga in Brazil, impacting biodiversity and regional climate.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Igor M. Venancio, Rodrigo A. Nascimento, Thiago P. Santos, Andre L. Belem, Douglas O. Lessa, Ralf Tiedemann, Cristiano M. Chiessi, Stefan Mulitza, Ana Luiza S. Albuquerque
Summary: Tropical precipitation patterns are likely to be altered by future climate change, causing major socioeconomic consequences for populations reliant on water availability for survival. Understanding the response of tropical precipitation to abrupt climate change, as evidenced by past events such as the Dansgaard-Oeschger cycles, is crucial for improving future projections and adaptation policies. This study presents a paleoceanographic reconstruction of northeastern Brazil, revealing changes in rainfall patterns during abrupt climate change events.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Alicia Hou, Andre Bahr, Cristiano M. Chiessi, Andrea Jaeschke, Ana Luiza S. Albuquerque, Jorg Pross, Andreas Koutsodendris, Oliver Friedrich
Summary: This study found that hydroclimate change in the coastal zone is primarily modulated by obliquity forcing rather than the South American Monsoon System. High-latitude forcing in the Northern Hemisphere may have increased the overturning circulation and led to reduced moisture advection to the coastal zone.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2022)
Article
Geography, Physical
Jaqueline Q. Ferreira, Cristiano M. Chiessi, Marina Hirota, Rafael S. Oliveira, Matthias Prange, Christoph Haggi, Stefano Crivellari, Sri D. Nandini-Weiss, Dailson J. Bertassoli, Marilia C. Campos, Stefan Mulitza, Ana Luiza S. Albuquerque, Andre Bahr, Enno Schefuss
Summary: By investigating sediment records from eastern tropical South America, it was found that obliquity has a significant influence on the expansion and contraction of tree and grass cover in tropical landscapes. The length of the dry season was identified as a crucial factor in controlling tree cover in these regions.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
Thiago P. Santos, Marilia H. Shimizu, Rodrigo A. Nascimento, Igor M. Venancio, Marilia C. Campos, Rodrigo C. Portilho-Ramos, Joao M. Ballalai, Douglas O. Lessa, Stefano Crivellari, Renata H. Nagai, Cristiano M. Chiessi, Henning Kuhnert, Andre Bahr, Ana Luiza S. Albuquerque
Summary: This study examines the sea surface temperature evolution of the Brazilian margin from the Last Glacial Maximum (LGM) to the late Holocene. The research reveals that the input of meltwater from retreating ice sheets and increasing atmospheric CO2 triggered the warming after the LGM. They also identified abrupt cooling events during periods of fast sea-level rise. These findings have important implications for understanding past and future climate changes in the region.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
Asli Oezmaral, Ayobami Abegunrin, Hanno Keil, Daniel A. Hepp, Tilmann Schwenk, Hendrik Lantzsch, Tobias Moerz, Volkhard Spiess
Summary: The southeastern North Sea was a sub-aerially exposed periglacial environment during the late Weichselian, and the Elbe Palaeovalley played a crucial role in the drainage system. The study provides detailed analysis of sediment and core samples to reconstruct the morphology and stratigraphy of the valley, revealing its evolution from a braided system to an estuary during deglacial sea-level rise.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Natalia Garcia Chapori, Cecilia Laprida, Daniel Lo Prete, Cristiano M. Chiessi, Christoph Mayr, Roberto A. Violante
Summary: Although our knowledge about the long-term past changes in the circulation of the western South Atlantic is fragmented and sparse, analysis of selected palaeoceanographic records reveals substantial changes in the Brazil-Malvinas Confluence region during the Holocene. The Southern Atlantic Meridional Overturning Circulation strengthened since the Mid-Holocene, while the Atlantic Meridional Overturning Circulation weakened towards the preindustrial times.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2022)
Article
Environmental Sciences
Jelena Maksic, Marilia H. Shimizu, Mary T. Kayano, Cristiano M. Chiessi, Matthias Prange, Gilvan Sampaio
Summary: The Atlantic Multidecadal Oscillation (AMO) has a coherent link with climate variations worldwide, but its influence on regional precipitation over South America is not well understood. This study uses a model to analyze the impact of AMO on South American precipitation and atmospheric circulation, revealing its association with changes in the Hadley circulation and the Atlantic Intertropical Convergence Zone (ITCZ) core strength.
Article
Geography, Physical
Andrea K. Kern, Thomas Kenji Akabane, Jaqueline Q. Ferreira, Cristiano M. Chiessi, Debra A. Willard, Fabricio Ferreira, Allan Oliveira Sanders, Cleverson G. Silva, Catherine Rigsby, Francisco W. Cruz, Gary S. Dwyer, Sherilyn C. Fritz, Paul A. Baker
Summary: This study investigates the vegetation history of the Amazon basin over the past 18 million years. The research suggests that the Amazonian lowlands were mainly composed of tropical rainforests, warm-temperate rainforests, and tropical seasonal forests, and their composition correlated with global climate cycles. The study also highlights the sensitivity of tropical rainforests to changes in CO2, temperature, and moisture availability.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geography, Physical
Alisson K. Martins, Karlos G. D. Kochhann, Cristiano M. Chiessi, Thorsten Bauersachs, Tamires N. Zardin, Marilia C. Campos, Guilherme Krahl, Lais V. de Souza, Stefano Crivellari, Andre Bahr, Henning Kuhnert, Lorenz Schwark, Gerson Fauth
Summary: This study examines the effects of past collapses or weakening of the Atlantic Meridional Overturning Circulation (AMOC) on different components of the climate system. By analyzing sediment data from the South Atlantic Ocean, the study finds that periods of AMOC declines were associated with wetter conditions over eastern tropical South America and higher sea surface temperatures in the western South Atlantic Ocean. Furthermore, it is found that intense runoff during one of these periods led to increased nutrient transfer to the ocean, resulting in higher primary productivity.
QUATERNARY INTERNATIONAL
(2023)
Article
Geology
Henriette Wilckens, Tilmann Schwenk, Thomas Ludmann, Christian Betzler, Wenyan Zhang, Jiayue Chen, F. Javier Hernandez-Molina, Alice Lefebvre, Antonio Cattaneo, Volkhard Spiess, Elda Miramontes
Summary: The aim of this study is to improve the understanding of the interaction between sedimentary systems and oceanographic processes in deep-water environments. By analyzing a large number of cross-sections of moat-drift systems from different locations worldwide, as well as in situ measured current data, the study provides new insights into the link between moat-drift system morphology and bottom current dynamics. Findings show that the slope angle and drift angle of bottom currents have an impact on the morphology of moat-drift systems.
Article
Geosciences, Multidisciplinary
Fynn Warnke, Tilmann Schwenk, Elda Miramontes, Volkhard Spiess, Stefan Wenau, Graziella Bozzano, Michele Baques, Sabine Kasten
Summary: This study investigates the origin and development of two giant seafloor depressions using multibeam bathymetry and seismic data. The depressions are likely formed by seafloor seepage and structural control, and their evolution is influenced by strong and variable bottom currents.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
A. Bahr, A. Jaeschke, A. Hou, K. Meier, C. M. Chiessi, A. L. Spadano Albuquerque, J. Rethemeyer, O. Friedrich
Summary: The accurate reconstruction of sea-surface temperatures is crucial for understanding the global climate system. In this study, we investigate the fidelity of SST reconstructions for the western tropical South Atlantic during Marine Isotope Stages 6-5. Our results show that previous SST estimates based on Mg/Ca ratios of planktic foraminifera are supported by alkenone-based temperature estimates, suggesting a warm-water anomaly during MIS 6. However, TEX86-derived temperatures are colder, potentially due to the vertical migration of the TEX86 producers.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Stefan Mulitza, Torsten Bickert, Helen C. Bostock, Cristiano M. Chiessi, Barbara Donner, Aline Govin, Naomi Harada, Enqing Huang, Heather Johnstone, Henning Kuhnert, Michael Langner, Frank Lamy, Lester Lembke-Jene, Lorraine Lisiecki, Jean Lynch-Stieglitz, Lars Max, Mahyar Mohtadi, Gesine Mollenhauer, Juan Muglia, Dirk Nuernberg, Andre Paul, Carsten Ruehlemann, Janne Repschlaeger, Rajeev Saraswat, Andreas Schmittner, Elisabeth L. Sikes, Robert F. Spielhagen, Ralf Tiedemann
Summary: This database presents a global atlas of downcore foraminiferal oxygen and carbon isotope ratios, providing valuable data for paleoceanographic analyses and teaching marine stratigraphy. It includes a large number of stable isotope records and radiocarbon ages from sediment cores.
EARTH SYSTEM SCIENCE DATA
(2022)