Article
Geosciences, Multidisciplinary
Lilian A. Dove, Giuliana A. Viglione, Andrew F. Thompson, M. Mar Flexas, Taylor R. Cason, Janet Sprintall
Summary: Drake Passage plays a crucial role in oceanic transport, but our understanding of this process is limited. In this study, we conducted wintertime hydrographic transects to investigate the exchange between the surface and interior ocean in the Southern Ocean. Despite strong wind and buoyancy forcing, the exchange was suppressed south of the Polar Front due to a freshwater lens, with ventilation occurring primarily at the front. Our analysis suggests that submesoscale processes, such as small-scale frontal structures and modulation of surface eddy diffusivity, contribute to ventilation at the front. This highlights the importance of adaptive observing strategies for understanding heat and carbon budgets in the Southern Ocean.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
F. Hodel, R. Grespan, M. de Rafelis, G. Dera, C. Lezin, E. Nardin, D. Rouby, M. Aretz, M. Steinnman, M. Buatier, F. Lacan, C. Jeandel, V. Chavagnac
Summary: The relationship between the establishment of the Antarctic Circumpolar Current (ACC) and the onset of the Oligocene glaciation is debated due to uncertainties in the timing of the Drake Passage gateway opening. The connection and deepening of the Southern Atlantic and Pacific oceans suggest that the ACC onset occurred around 31-26 million years ago, prior to the onset of the Oligocene glaciation at 33.7 Ma, indicating that atmospheric pCO(2) may have played a significant role in triggering the glaciation.
Article
Geosciences, Multidisciplinary
Annika Jersild, Sara Delawalla, Takamitsu Ito
Summary: The Southern Ocean is a critical region for the uptake of anthropogenic carbon, with the transport of carbon and nutrients mainly controlled by the Antarctic Circumpolar Current and mesoscale eddies. A computational model explicitly representing mesoscale eddies can accurately reproduce observed seasonal biological productivity and carbon dioxide levels. Suppressed eddy activity in the model significantly alters iron supply and phytoplankton bloom phenology, causing biases in the seasonal carbon cycle and partial pressure of carbon dioxide among current Earth System Models.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Oceanography
Manuel O. Gutierrez-Villanueva, Teresa K. Chereskin, Janet Sprintall, John A. Goff
Summary: Radiation and breaking of internal lee waves in the Southern Ocean have been studied to understand their role in the energy and heat budget. This study estimated the linear lee-wave energy radiation and local dissipation using a time series of stratification and near-bottom currents. The results showed that most of the lee-wave energy radiation occurred in the Polar Front Zone of the Antarctic Circumpolar Current (ACC), and both baroclinic and barotropic instabilities influenced the conversion to lee waves in this region. The study also found that the local dissipation of lee-wave energy was less than 10%, which is contrary to previous numerical predictions.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2022)
Article
Environmental Sciences
Xiayan Lin, Hui Zhao, Yu Liu, Guoqing Han, Han Zhang, Xiaomei Liao
Summary: This study analyzed the statistical characteristics of mesoscale eddies in the Drake Passage using a 10-year dataset from 2009 to 2018. The findings revealed that the eddies had an average radius of 35.5 km, a mean lifespan of 12.3 weeks, and a mean vorticity of 2.2 x 10(-5) s(-1). They were most active near the three main fronts and propagated northeastward at an average distance of 97.8 km. The shape, size, and distribution of the eddies varied with water depth, with anticyclones dominating near the surface and cyclones having longer lifespans and greater vorticity.
Article
Geography, Physical
Sunghan Kim, Jae Il Lee, Kyu-Cheul Yoo, Min Kyung Lee, Young-Suk Bak, Myung-Il Kang, Sookwan Kim, Jinku Park
Summary: Oceanographic conditions in the Southern Ocean are influenced by the oceanic frontal system, which is in turn affected by glacial-interglacial changes in the cryosphere. These changes impact surface water productivity, nutrient utilization, bottom water chemistry, and bottom current intensity. The study highlights the importance of light availability and sea ice duration/extent in regulating surface water production. The findings also suggest the need for further research on the response of the Southern Ocean to the Mid-Brunhes Event.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2023)
Article
Multidisciplinary Sciences
Shuzhuang Wu, Lester Lembke-Jene, Frank Lamy, Helge W. Arz, Norbert Nowaczyk, Wenshen Xiao, Xu Zhang, H. Christian Hass, Juergen Titschack, Xufeng Zheng, Jiabo Liu, Levin Dumm, Bernhard Diekmann, Dirk Nuernberg, Ralf Tiedemann, Gerhard Kuhn
Summary: Research has shown significant changes in the speed of the Antarctic Circumpolar Current (ACC) during glacial and interglacial periods, with a stronger circulation in the Antarctic during glacials. Additionally, the ACC is closely linked to millennial-scale climate oscillations in the Southern Hemisphere, amplified through changes in Antarctic sea ice extent.
NATURE COMMUNICATIONS
(2021)
Article
Oceanography
Li Zhou, Qiang Wang, Mu Mu, Kun Zhang
Summary: The accurate prediction of the Antarctic circumpolar current (ACC) transport remains challenging due to its high nonlinearity. This study investigates the sudden shifts in ACC transport through Drake Passage (DP) and finds that the optimal precursor (OPR) at specific depths and structures in the middle DP plays a crucial role in triggering sudden reductions in transport. Baroclinic instability is identified as a dominant factor in the development of OPRs, suggesting that careful monitoring of deep-layer density perturbations in the Southern Ocean is important for short-range ACC transport prediction.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2021)
Article
Geosciences, Multidisciplinary
Suzanna H. A. van de Lagemaat, Merel L. A. Swart, Bram Vaes, Martha E. Kosters, Lydian M. Boschman, Alex Burton-Johnson, Peter K. Bijl, Wim Spakman, Douwe J. J. van Hinsbergen
Summary: The translation explores the incorporation of continental crust from the South American and Antarctic plates into the upper plate of the South Sandwich subduction zone, as well as the kinematic reconstruction of the Scotia Sea region. It shows that the southward motion of the South American Plate led to retreat of the upper plate above the South Sandwich Trench, with both subduction and retreat contributing to the extension in the Scotia Sea basins.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geography, Physical
Marlise Colling Cassel, Farid Chemale Jr, Mateus Rodrigues Vargas, Marcelo Kehl de Souza, Tiago Jonatan Girelli, Gisela Serejo de Oliveira
Summary: The Cenozoic depositional history of the Pelotas Basin was influenced by the spreading processes of the Atlantic Ocean and the formation of the Andean Cordillera. The study integrated seismic interpretation and backstripping techniques with evaluation of spreading rates in the South Atlantic and subduction beneath the Andes to uncover the main climatic, eustatic, and active tectonic events in the Cenozoic. The results showed the tectonic control of the Andean Cordillera over the Pelotas Basin's passive margin, as well as the influence of climatic and glacioeustatic changes driven by the opening of Drake Passage and the Antarctic Circumpolar Current.
GLOBAL AND PLANETARY CHANGE
(2022)
Article
Environmental Sciences
Franziska Pausch, Florian Koch, Christel Hassler, Astrid Bracher, Kai Bischof, Scarlett Trimborn
Summary: This study investigates the responses of Southern Ocean phytoplankton under different climate change scenarios. It finds that under ocean acidification, the numerical dominance of diatoms is reduced in both future mixing scenarios, but their productivity increases.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Oceanography
Gaston Kreps, Lester Lembke-Jene, Silvia Romero, Ramiro Ferrari, Frank Lamy, Elda Miramontes
Summary: This study focused on the intensity and variability of bottom currents in the Drake Passage and found that they are disconnected from surface dynamics and strongly controlled by the rough topography. The variability patterns of bottom currents are related to local topography and may affect erosion and deposition rates differently. High-speed current events were observed, but contourite drifts accumulated preferentially in zones of slow and stable bottom currents.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Environmental Sciences
Jingxi Li, Di Zhang, Fenglei Gao, Chengjun Sun, Wei Cao, Fenghua Jiang
Summary: This study analyzed the distribution characteristics and correlations of 11 trace elements in surface seawater collected from the Drake Passage and Antarctic Peninsula sea area. The concentration of different elements showed remarkable differences, with relatively high concentrations of Mn, Mo, Zn, and U. The concentration of trace elements in the Drake Passage water was relatively low, possibly due to the existence of a westerly drift that enhances large circulating currents. Mn, Co, Cu, Zn, Cd, and Pb showed relatively high concentrations at more stations, with Mn, Co, and Cd mainly found in shallow water areas. Good linear correlations were observed between certain element pairs.
MARINE POLLUTION BULLETIN
(2022)
Article
Ecology
Nele Manon Vollmar, Karl-Heinz Baumann, Mariem Saavedra-Pellitero, Ivan Hernandez-Almeida
Summary: The Southern Ocean is undergoing significant changes that may impact the composition and distribution of pelagic plankton communities. This study investigates the (sub-)fossil coccolith assemblages preserved in surface sediments of southernmost Chile and the Drake Passage. The findings highlight the biodiversity and morphological diversity of coccoliths, emphasizing their response to changing environmental conditions.
Article
Meteorology & Atmospheric Sciences
Paola Rodriguez Imazio, Andreas Doernbrack, Rodrigo Delgado Urzua, Nicolas Rivaben, Alejandro Godoy
Summary: This study investigates an aircraft turbulence encounter over the Drake Passage by combining various data and model results. The researchers found that the turbulence was caused by an intense polar low, and the clear air turbulence (CAT) indices accurately predicted the location of the turbulence.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2022)
Article
Paleontology
Damian E. Perez, Maximiliano J. Alvarez, M. Belen Santelli
Article
Paleontology
Maximiliano Jorge Alvarez, Damian Eduardo Perez
Article
Paleontology
Damian E. Perez, Claudia J. del Rio
JOURNAL OF PALEONTOLOGY
(2017)
Article
Paleontology
Damian Eduardo Perez, Maximiliano Jorge Alvarez, Claudia Julia Del Rio
REVISTA BRASILEIRA DE PALEONTOLOGIA
(2017)
Article
Zoology
Damian E. Perez, Claudia J. Del Rio
Article
Multidisciplinary Sciences
Damian Eduardo Perez, Maria Belen Santelli
Article
Geology
Diana E. Fernandez, Damian E. Perez, Leticia Luci, Martin A. Carrizo
Article
Evolutionary Biology
Damian Eduardo Perez
JOURNAL OF SYSTEMATIC PALAEONTOLOGY
(2019)
Article
Paleontology
Damian E. Perez, Luciana M. Giachetti
Article
Biodiversity Conservation
Damian Eduardo Perez, Ignacio Maria Soto
Summary: Marsupial carditids of the subfamily Thecaliinae have an incubatory chamber in female shells where eggs hatch and develop. Recent phylogenetic studies suggest that Thecaliinae are closely related to Carditinae, which have a byssal gape, possibly indicating an evolutionary connection between the two structures. The evolution of the incubatory chamber from the byssal gape is discussed, with implications for evolutionary pathways and the importance of considering non-adaptive scenarios in evolutionary narratives.
Editorial Material
Paleontology
Sebastian Echarri, Damian E. Perez, Marcelo Minana, Sergio O. Lucero
Article
Geology
Damian Eduardo Perez, Daniela Soledad Monti
Summary: This study provides a phylogenetic analysis of the Carditidae and reveals the inclusion of Xenocardita within the tribe Venericardiini. The research also re-evaluates the morphology of the radial ribs and proposes a revised evolutionary history of the tripartite radial rib pattern.
CRETACEOUS RESEARCH
(2022)
Article
Geology
Damian Eduardo Perez
Article
Geology
Diana E. Fernandez, Luciana Giachetti, Sabine Stohr, Ben Thuy, Damian E. Perez, Marcos Comerio, Pablo J. Pazos
Article
Geography, Physical
Huyue Song, Shixue Hu, Michael Benton, Dayong Jiang
Summary: This article examines the end Permian to Middle Triassic interval, which witnessed a significant marine mass extinction and delayed recovery. The focus is on Triassic marine sediments in South China, providing unique documentation of the collapse and recovery of marine ecosystems. Several papers analyze different fossils and their ecological significance, while others study biostratigraphy, reconstruct paleoenvironments, and link records to volcanic eruptions.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Mohammad Firoze Quamar, Upasana Swaroop Banerji, Biswajeet Thakur, Ratan Kar
Summary: The Indian Summer Monsoon is a crucial component of the Asian Monsoon System, impacting rainfall, agricultural productivity, and socio-economic growth in India and nearby regions. The central monsoon zone in India is more responsive to strong monsoon phases than weak ones.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Maria Laura Balestrieri, Valerio Olivetti, David Chew, Luca Zurli, Massimiliano Zattin, Foteini Drakou, Gianluca Cornamusini, Matteo Perotti
Summary: This study presents a multidisciplinary provenance study on legacy cores drilled in the central Ross Sea, Antarctica, providing insights into the oscillation of ice flows and advance and retreat phases of the West Antarctic Ice Sheet.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
P. Depuydt, S. Toucanne, C. Barras, S. Le Houedec, M. Mojtahid
Summary: This study provides a comprehensive overview of the dynamics of the upper branch of the Atlantic Meridional Overturning Circulation (AMOC) in the mid-latitudes of the Northeast Atlantic. It focuses on the European Slope Current (ESC) and its glacial equivalent known as the Glacial Eastern Boundary Current (GEBC). The study reveals significant changes in flow strength and ventilation during the glacial and deglaciation periods, as well as a gradual weakening of the slope current during the Holocene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Junhee Park, Holly J. Stein, Judith L. Hannah, Svetoslav V. Georgiev, Oyvind Hammer, Snorre Olaussen
Summary: This study reports new Re-Os ages for black shales from Svalbard and evaluates the paleoenvironment during organic-rich shale deposition. The study also proposes correlations of specific Late Jurassic ammonite zones between the Boreal and Tethyan realms.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Guocheng Dong, Weijian Zhou, Feng Xian, Yunchong Fu, Li Zhang, Ling Tang, Pengkai Ding
Summary: The cause of ice-age cycles is still not fully understood, and studying the timing and magnitude of mountain glaciations can provide valuable insights. This study presents new dating results from the Niqingqu Valley in the Tibetan Plateau, showing multiple glacial activities prior to the Penultimate Glacial Maximum. The findings suggest that low atmospheric CO2 content and reduced summer solar insolation/high summer-monsoon precipitation played a role in these glacial fluctuations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Haoran Dong, Zhitong Chen, Yucheng Wang, Jie Chen, Zhiping Zhang, Zhongwei Shen, Xinwei Yan, Jianbao Liu
Summary: Through sediment records from Lake Nanyi in the lower Yangtze, we found that anthropogenic fire activity played a dominant role in the region, and the temporal pattern of fire activity was asynchronous from east to west. Archaeological evidence suggests an inverse relationship between agricultural and population levels and fire intensity during the mid-Holocene, with fire intensity being influenced by the diversity of landscape types associated with pre-historic subsistence patterns. Overall, changes in regional water-level delayed the transition from hunting-gathering to agriculture in the lower Yangtze region.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Giovanni Coletti, Giulia Bosio, Alberto Collareta, Or Mordecai Bialik, Eleonora Regattieri, Irene Cornacchia, Gianni Insacco, John Buckeridge
Summary: This paper argues that sessile barnacles are an excellent proxy for palaeoenvironmental reconstructions. The shells of barnacles consist of diagenetically stable low-magnesium calcite and record short-term variations. Analyses of several Western Mediterranean barnacle-rich deposits demonstrate the utility of barnacles as proxies for water depth, distance from the coastline, and hydrodynamic conditions. Moreover, the stable isotope ratios of barnacle shells can provide detailed palaeoenvironmental information.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Feng Wu, Xinong Xie, Wen Yan, Youhua Zhu, Beichen Chen, Jianuo Chen, Mo Zhou
Summary: This paper describes the Quaternary evolution of Meiji Atoll in the southern South China Sea. The findings show how variations in sea surface temperature, eustatic sea level, and tectonics have influenced the development of the atoll. These findings have broader implications for understanding the Quaternary evolution of similar tropical carbonate atolls in the region.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Ana Mateos, Ericson Hoelzchen, Jesus Rodriguez
Summary: The Epivillafranchian and the transition to the Galerian was a period of environmental fluctuations and faunal turnover. Hominins and giant hyenas could coexist during the Epivillafranchian, but the transition to the Galerian led to a disruption of the scavenging niche, coinciding with the extinction of P. brevirostris.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Tianyu Du, Wensheng Zhang, Bing Li, Linjing Liu, Yuecong Li, Yawen Ge, Shiyong Yu
Summary: This article presents sedimentary evidence for a dramatic channel displacement of the lower Yellow River about 3000-2600 years ago, and explains the impact of this displacement on the geomorphology and human migration.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Johann Mueller, Michael M. Joachimski, Oliver Lehnert, Peep Mannik, Yadong Sun
Summary: The Late Ordovician mass extinction occurred during an ice age, with maximum ice coverage and a substantial drop in global sea level. This led to the exposure or shallowing of shallow tropical shelf environments. The study suggests that the burial rate of nutrient phosphorus (P) on shelves was minimal during this glacial period, leading to excess bioavailable P entering the open ocean and stimulating phytoplankton production, which in turn lowered oxygen concentrations.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Marina Addante, Patrizia Maiorano, Giovanna Scopelliti, Angela Girone, Maria Marino, Samanta Trotta, Antonio Caruso
Summary: This study presents the first high-resolution results on planktonic foraminiferal stable oxygen isotopes and calcareous plankton assemblages, providing insights into the glacial-interglacial variability and North Atlantic climate variability. The research also reveals evidence of the first significant southward migration of the Subarctic Front in the mid-latitudes.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Bing-Cai Liu, Rui-Wen Zong, Kai Wang, Jiao Bai, Yi Wang, Hong-He Xu
Summary: Phytogeography plays a vital role in the evolution of plants. This paper describes a new species of a spore-bearing plant from the upper Silurian period in West Junggar, China. By analyzing global Silurian macrofossil records, the study reveals the spatial-temporal distribution of Silurian plant macrofossils and identifies two phytogeographic realms during the Pridoli Epoch.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)
Article
Geography, Physical
Francois Fournier, Thomas Teillet, Alexis Licht, Jean Borgomano, Lucien Montaggioni
Summary: This study investigates the temporal evolution of neritic carbonates in the proto-South China Sea to reconstruct East Asian monsoonal currents and winds during the middle to late Paleogene. The results highlight that many of the features of the summer East Asian Monsoon large-scale circulation are rooted in the middle Paleogene.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2024)