Article
Geosciences, Multidisciplinary
Ming Zhang, Yonggang Liu, Jiang Zhu, Zhuoqun Wang, Zhengyu Liu
Summary: In this study, we investigated the changes in climate and Atlantic Meridional Overturning Circulation (AMOC) during the Last Glacial Maximum if there were no dust. Model simulations showed that the removal of dust resulted in a global cooling and weakening of AMOC. This cooling effect was opposite to that observed during the mid-Holocene and was amplified by a positive feedback between sea ice and AMOC.
GEOPHYSICAL RESEARCH LETTERS
(2022)
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
Geosciences, Multidisciplinary
Alicia Vasquez, Valentina Flores-Aqueveque, Esteban Sagredo, Rodrigo Hevia, Rodrigo Villa-Martinez, Patricio I. Moreno, Jose L. Antinao
Summary: The evolution and age of large ice-dammed lakes along the eastern margin of the Patagonian Ice Sheet were studied, providing valuable insights into fluctuations of the shrinking ice sheet, isostatic adjustments, and climate forcing.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Samuel Toucanne, Guillaume Soulet, Natalia Vazquez Riveiros, Steven M. Boswell, Bernard Dennielou, Claire Waelbroeck, Germain Bayon, Meryem Mojtahid, Mathieu Bosq, Marjolaine Sabine, Sebastien Zaragosi, Jean-Francois Bourillet, Herle Mercier
Summary: The study reveals the important role of the upper branch of the Atlantic meridional overturning circulation (AMOC) in ocean circulation and climate change during the glacial period. Fluctuations in the Glacial Eastern Boundary Current (GEBC) during Dansgaard-Oeschger (D-O) interstadials correspond to variations in subpolar gyre strength and northern-sourced water production, impacting deep water formation and AMOC strength. Ice-sheet-AMOC interactions during the last glacial period and deglaciation are explored, revealing abrupt climate changes.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Multidisciplinary Sciences
Tyler R. Jones, Kurt M. Cuffey, William H. G. Roberts, Bradley R. Markle, Eric J. Steig, C. Max Stevens, Paul J. Valdes, T. J. Fudge, Michael Sigl, Abigail G. Hughes, Valerie Morris, Bruce H. Vaughn, Joshua Garland, Bo M. Vinther, Kevin S. Rozmiarek, Chloe A. Brashear, James W. C. White
Summary: By analyzing water-isotope ratios in the West Antarctic Ice Sheet Divide ice core, researchers have revealed the changes in summer and winter temperatures over the past 11,000 years. The results show that summer temperature variations are primarily related to summer insolation, while winter temperatures are influenced by meridional heat transport. The study also provides evidence for the reduction in ice sheet surface area in West Antarctica, supporting geological constraints in the region.
Article
Geography, Physical
Stephanie Heath, Brenda L. Hall, George H. Denton, Gideon M. Henderson, Chris H. Hendy
Summary: An understanding of Antarctic Ice Sheet (AIS) behavior is crucial for predicting future sea-level rise. This study investigates the ice-sheet history in the McMurdo Sound region of the western Ross Sea over the past two glacial cycles. The findings suggest that ice expansion in this area is driven by low Antarctic air temperatures, potentially influenced by ocean dynamics. Moreover, the timing of ice retreat and maximum extent differs from global events, indicating the impact of accumulation on ice-sheet mass balance.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geography, Physical
Dag Ottesen, Christine L. Batchelor, Lilja R. Bjarnadottir, Daniel Hesjedal Wiberg, Julian A. Dowdeswell
Summary: The analysis of glacial landforms on continental margins provides insights into sedimentation processes beneath ice sheets and aids predictions of future ice sheet resilience. This study used high-resolution marine-geophysical data to map and interpret glacial landforms along the mid-Norwegian margin, revealing the dynamic behavior of the Scandinavian Ice Sheet during the last glacial-interglacial cycle. The geometry of the continental shelf played a key role in controlling the pattern of ice-sheet retreat.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Sunil Kumar Shukla, Xavier Crosta, Minoru Ikehara
Summary: The study found that sea-surface temperature in the Southern Ocean during interglacial periods is influenced by changes in insolation in both the Northern and Southern Hemispheres. The early warm phase is likely due to changes in northern summer insolation, while the late warm phase is attributed to changes in Southern Hemisphere summer insolation. The Holocene experienced continuous warming, possibly due to the stable thermohaline circulation.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Hans Petter Sejrup, Berit Oline Hjelstuen, Henry Patton, Mariana Esteves, Monica Winsborrow, Tine Lander Rasmussen, Karin Andreassen, Alun Hubbard
Summary: Information from former ice sheets is crucial for understanding the response of current ice sheets to external forces. This study reconstructs the last deglaciation of marine sectors of the Eurasian Ice Sheet, highlighting the separation of ice sheets due to the retreat of ice streams in the Norwegian Channel, Barents Sea, and Kara-Barents Sea-Svalbard regions. The study shows that the deglaciation was primarily driven by temperature-related surface mass balance in the south and oceanic conditions in the north, emphasizing the nonlinearity in ice sheet response and the significance of ocean-ice-atmosphere dynamics.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Geography, Physical
Matthias Troch, Sebastien Bertrand, Carina B. Lange, Paola Cardenas, Helge Arz, Silvio Pantoja-Gutierrez, Ricardo De Pol-Holz, Rolf Kilian
Summary: Our research investigates glacial isostatic rebound in Patagonia and its impact on past ice volume estimates and relative sea-level variations. We focus on the Larenas Bay and reconstruct the magnitude and rate of glacial isostatic adjustment during the Late Glacial and Holocene. Results show that the postglacial rebound started before 16.5 kyr BP and outpaced global sea-level rise until slightly before 9.1 kyr BP, with an absolute uplift of 96 m and an average rate of 1.3 cm/yr during the Late Glacial and early Holocene. Comparisons with global sea-level rise and glacier dynamics suggest fluctuations in glacial isostatic adjustment rate.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Holly Kyeore Han, Natalya Gomez, David Pollard, Robert DeConto
Summary: The study demonstrates that solid Earth deformation and gravitational field perturbations have significant impacts on the evolution of Northern Hemisphere ice sheets, enhancing terrestrial ice sheets during growth phases and stabilizing marine-based ice sheets during retreat phases.
JOURNAL OF GEOPHYSICAL RESEARCH-EARTH SURFACE
(2021)
Article
Geosciences, Multidisciplinary
Maria-Paz Lira, Juan-Luis Garcia, Michael J. Bentley, Stewart S. R. Jamieson, Christopher M. Darvill, Andrew S. Hein, Hans Fernandez, Angel Rodes, Derek Fabel, Rachel K. Smedley, Steven A. Binnie
Summary: This study presents geomorphological and geochronological reconstructions of the glacial and deglacial landforms in the southernmost part of Patagonia during the last glacial period. Through dating the moraines and paleo lakes, the study reveals the asynchrony of ice advances and different patterns of ice retreat between neighboring lobes, which may be attributed to the interaction between topography and precipitation from the southern westerly wind belt.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Geography, Physical
Kwangchul Jang, Youngkyu Ahn, Young Jin Joe, Carmen A. Braun, Young Ji Joo, Jung-Hyun Kim, Germain Bayon, Matthias Forwick, Christoph Vogt, Seung-Il Nam
Summary: The study of the glacimarine sediment core off northern Svalbard provides insights into the variability of sediment provenance and chemical weathering patterns since the last deglaciation, allowing for the identification of distinct paleoclimate events. The dataset indicates retreat and re-advance phases of the Svalbard-Barents Sea Ice Sheet, as well as prolonged supply of radiogenic detrital Nd isotopes, highlighting the utility of Nd isotopes as a proxy for reconstructing paleo-cryosphere changes.
GLOBAL AND PLANETARY CHANGE
(2021)
Article
Geography, Physical
Mikis van Boeckel, Tayo van Boeckel, Adrian M. Hall
Summary: The arrival of meltwater during deglaciation can transform subglacial conditions and result in significant reworking and erosion of rock and sediment.
EARTH SURFACE PROCESSES AND LANDFORMS
(2022)
Article
Geosciences, Multidisciplinary
Guleed A. H. Ali, Ke Lin, Sidney R. Hemming, Stephen E. Cox, Philipp Ruprecht, Susan R. H. Zimmerman, Scott Stine, Xianfeng Wang
Summary: Geologic studies in the western USA have revealed evidence of past wetness in the arid Basin and Range region. The timing of these wetter conditions suggests a link with glacial climate. By determining the start of persistent wetness in the Mono Basin, researchers have found that it aligns with the beginning of the Last Glaciation, supporting the hypothesis of a causal relationship between glacial climate and regional wetness.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geography, Physical
Silvia Nave, Susana Lebreiro, Elisabeth Michel, Catherine Kissel, Maria Ondina Figueiredo, Abel Guihou, Antonio Ferreira, Laurent Labeyrie, Ana Alberto
QUATERNARY RESEARCH
(2019)
Article
Geosciences, Multidisciplinary
N. Bouttes, N. Vazquez Riveiros, A. Govin, D. Swingedouw, M. F. Sanchez-Goni, X. Crosta, D. M. Roche
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2020)
Article
Environmental Sciences
Charlotte da Cunha, Ana Paula Farias Rocha, Marianne Cardon, Florentin Breton, Laurent Labeyrie, Jean-Paul Vanderlinden
CLIMATE RISK MANAGEMENT
(2020)
Article
Multidisciplinary Sciences
Russell Drysdale, Isabelle Couchoud, Giovanni Zanchetta, Ilaria Isola, Eleonora Regattieri, John Hellstrom, Aline Govin, Polychronis C. Tzedakis, Trevor Ireland, Ellen Corrick, Alan Greig, Henri Wong, Leonardo Piccini, Peter Holden, Jon Woodhead
NATURE COMMUNICATIONS
(2020)
Article
Geography, Physical
Kazuyo Tachikawa, William Rapuc, Laurence Vidal, Quentin Dubois-Dauphin, Thomas Westerhold, Abel Guihou, Torsten Bickert, Jose N. Perez-Asensio, Pierre Deschamps, Charlotte Skonieczny
Summary: The Mid-Pleistocene transition (MPT) refers to the shift from 41-kyr to 100-kyr interglacial-glacial cyclicity, which relied on internal feedback processes including interaction between ice sheet/sea ice, ocean circulation and the carbon cycle. By analyzing neodymium isotopic composition and foraminiferal data, it was found that a major perturbation of global oceanic carbon chemistry occurred around 900 ka, leading to persistent meridional gradient of seawater epsilon(Nd) in the Atlantic Ocean over the past 1100 kyr. This perturbation was mainly attributed to the weaker Atlantic Meridional Overturning Circulation (AMOC) and changes in Nd sources.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geochemistry & Geophysics
Camille Delvigne, Abel Guihou, Jan A. Schuessler, Paul Savage, Franck Poitrasson, Sebastian Fischer, Jade E. Hatton, Katharine R. Hendry, Germain Bayon, Emmanuel Ponzevera, Bastian Georg, Alisson Akerman, Oleg S. Pokrovsky, Jean-Dominique Meunier, Pierre Deschamps, Isabelle Basile-Doelsch
Summary: The use of silicon isotopes has led to significant advancements in understanding silicon cycling in various environments. This inter-laboratory comparison exercise provided soil and plant reference materials with organic material, resulting in excellent agreement among seven laboratories using different analytical setups. The data obtained will serve as valuable resources for future research on silicon isotopes.
GEOSTANDARDS AND GEOANALYTICAL RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Samuel Toucanne, Guillaume Soulet, Natalia Vazquez Riveiros, Steven M. Boswell, Bernard Dennielou, Claire Waelbroeck, Germain Bayon, Meryem Mojtahid, Mathieu Bosq, Marjolaine Sabine, Sebastien Zaragosi, Jean-Francois Bourillet, Herle Mercier
Summary: The study reveals the important role of the upper branch of the Atlantic meridional overturning circulation (AMOC) in ocean circulation and climate change during the glacial period. Fluctuations in the Glacial Eastern Boundary Current (GEBC) during Dansgaard-Oeschger (D-O) interstadials correspond to variations in subpolar gyre strength and northern-sourced water production, impacting deep water formation and AMOC strength. Ice-sheet-AMOC interactions during the last glacial period and deglaciation are explored, revealing abrupt climate changes.
PALEOCEANOGRAPHY AND PALEOCLIMATOLOGY
(2021)
Article
Biochemical Research Methods
Delphine Yeghicheyan, Patricia Grinberg, Laurent Y. Alleman, Moustafa Belhadj, Lea Causse, Jerome Chmeleff, Laure Cordier, Irina Djouraev, David Dumoulin, Jean Dumont, Remi Freydier, Helene Mariot, Christophe Cloquet, Paramee Kumkrong, Bruno Malet, Catherine Jeandel, Aurelie Marquet, Jean Riotte, Mickael Tharaud, Gabriel Billon, Guillaume Trommetter, Fabienne Seby, Abel Guihou, Pierre Deschamps, Zoltan Mester
Summary: The Isotrace CNRS workgroup, in collaboration with the National Research Council of Canada, characterized trace element mass fractions and isotope ratios in the AQUA-1 natural drinking water reference material. The study expands the material's use as a tool for environmental quality control and method validation. Additionally, analysis of SLRS-6 river water was conducted for quality control and comparison with treated water from the same area.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2021)
Article
Geochemistry & Geophysics
R. A. Nascimento, I. M. Venancio, C. M. Chiessi, J. M. Ballalai, H. Kuhnert, H. Johnstone, T. P. Santos, M. Prange, A. Govin, S. Crivellari, S. Mulitza, A. L. S. Albuquerque
Summary: The study revealed the importance of changes in upper ocean circulation in the western tropical Atlantic for the northward heat transport as part of the Atlantic Meridional Overturning Circulation, with seasonal thermocline stratification being driven by precession. Using oxygen isotopes and Mg/Ca, the research confirmed that changes in thermocline temperature predominantly impact stratification.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Geography, Physical
R. A. Nascimento, T. P. Santos, I. M. Venancio, C. M. Chiessi, J. M. Ballalai, H. Kuhnert, A. Govin, R. C. Portilho-Ramos, D. Lessa, B. B. Dias, T. M. L. Pinho, S. Crivellari, S. Mulitza, A. L. S. Albuquerque
Summary: This study presents high-resolution data of carbon isotopes in the Western South Atlantic, revealing the widespread occurrence of carbon isotope minimum events during glacial terminations and transitions. Different mechanisms were identified for the occurrence of carbon isotope minima at different depths in the Atlantic Ocean.
QUATERNARY SCIENCE REVIEWS
(2021)
Article
Geography, Physical
J. B. Pedro, C. Andersson, G. Vettoretti, A. H. L. Voelker, C. Waelbroeck, T. M. Dokken, M. F. Jensen, S. O. Rasmussen, E. G. Sessford, M. Jochum, K. H. Nisancioglu
Summary: By utilizing eighteen timescale-synchronised near-surface temperature reconstructions spanning 10-50 thousand years before present, the study clarifies the regional expression of Dansgaard-Oeschger (D-O) and Heinrich (H) events in the North Atlantic. The spatial patterns of temperature anomalies in different regions are dominated by coupled changes in the Atlantic Meridional Overturning, sea ice extent, polar front position, and thermocline structure.
QUATERNARY SCIENCE REVIEWS
(2022)
Article
Environmental Sciences
Laurie Menviel, Aline Govin, Arthur Avenas, Katrin J. Meissner, Katharine M. Grant, Polychronis C. Tzedakis
Summary: The study suggests that the strengthening of the Atlantic Meridional Overturning Circulation plays a dominant role in the abrupt initiation of African Humid Periods, while the presence of residual Northern Hemispheric ice-sheets may delay the peak of the humid periods. Differences in the rate of insolation increase during the penultimate deglaciation compared to the last deglaciation explain the timing differences in the onset of African Humid Periods during these two periods.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Article
Geology
Clement Flaux, Matthieu Giaime, Valerie Pichot, Nick Marriner, Mena El-Assal, Abel Guihou, Pierre Deschamps, Christelle Claude, Christophe Morhange
Summary: Lake Maryut in Egypt played a key role in Alexandria's hinterland and economy during Greco-Roman times, acting as a gateway between the Nile valley and the Mediterranean. By analyzing faunal remains, geochemistry, and geoarcheological indicators, researchers reconstructed the lake's hydrology in historical times. The data revealed increased Nile inputs and a rise in lake level during the Roman period, with a high-energy event possibly explaining a sedimentary hiatus in Maryut's chronostratigraphy.
E&G QUATERNARY SCIENCE JOURNAL
(2021)
Article
Geosciences, Multidisciplinary
Bette L. Otto-Bliesner, Esther C. Brady, Anni Zhao, Chris M. Brierley, Yarrow Axford, Emilie Capron, Aline Govin, Jeremy S. Hoffman, Elizabeth Isaacs, Masa Kageyama, Paolo Scussolini, Polychronis C. Tzedakis, Charles J. R. Williams, Eric Wolff, Ayako Abe-Ouchi, Pascale Braconnot, Silvana Ramos Buarque, Jian Cao, Anne de Vernal, Maria Vittoria Guarino, Chuncheng Guo, Allegra N. LeGrande, Gerrit Lohmann, Katrin J. Meissner, Laurie Menviel, Polina A. Morozova, Kerim H. Nisancioglu, Ryouta O'ishi, David Salas y Melia, Xiaoxu Shi, Marie Sicard, Louise Sime, Christian Stepanek, Robert Tomas, Evgeny Volodin, Nicholas K. H. Yeung, Qiong Zhang, Zhongshi Zhang, Weipeng Zheng
Summary: The study analyzes the climate responses of 127,000 years ago using 17 climate models, showing variations in climate sensitivity, summer warming over Northern Hemisphere continents, and increased monsoonal precipitation. Compared to the CMIP6 midHolocene experiment, lig127k exhibits greater responses, highlighting the importance of sensitivity to boundary conditions and uncertainties in proxy reconstructions for future climate projections.
CLIMATE OF THE PAST
(2021)
Article
Geosciences, Multidisciplinary
Lise Missiaen, Nathaelle Bouttes, Didier M. Roche, Jean-Claude Dutay, Aurelien Quiquet, Claire Waelbroeck, Sylvain Pichat, Jean-Yves Peterschmitt
CLIMATE OF THE PAST
(2020)
Article
Geochemistry & Geophysics
Lingyu Zhang, Kristoffer Szilas
Summary: This study presents new petrological and geochemical data for the Narssaq Ultramafic Body (NUB) in the Itsaq Gneiss Complex of SW Greenland. The results indicate that the ultramafic rocks of NUB are not mantle residues, but instead represent crustal cumulates derived from high-Mg magmas.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Rong Xu, Sarah Lambart, Oliver Nebel, Ming Li, Zhongjie Bai, Junbo Zhang, Ganglan Zhang, Jianfeng Gao, Hong Zhong, Yongsheng Liu
Summary: This study investigated the iron isotope compositions of Cenozoic basalts in Southeast China, finding significant variations related to different types of basalts and their respective sources.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
C. J. Ebinger, Miriam C. Reiss, Ian Bastow, Mary M. Karanja
Summary: The East African rift system is formed above mantle upwellings and the formation of rifts is related to lithospheric thinning and magmatic activity. The amount of splitting varies spatially and the fast axes are predominantly parallel to the orientation of the rifts. Thick lithospheric modules have less splitting and different orientations, which may indicate mantle plume flow. Splitting rotates and increases in strength as it enters the rift zones, suggesting that the anisotropy is mainly present at shallow depths.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Correction
Geochemistry & Geophysics
Ekaterina Rojas-Kolomiets, Owen Jensen, Michael Bizimis, Gene Yogodzinski, Lukas Ackerman
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Robert W. Nicklas, Igor S. Puchtel, Ethan F. Baxter
Summary: Oxygen fugacity is a fundamental parameter for understanding redox processes in igneous systems. This study compares the Fe-XANES oxybarometry method with the V-in-olivine method for evaluating fO(2) in MORB lavas. The results show that the V-in-olivine method is not applicable to samples with low MgO content, and that the majority of Archean komatiite sources have lower fO(2) than modern MORB.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Chunfei Chen, Stephen F. Foley, Sebastian Tappe, Huange Ren, Lanping Feng, Yongsheng Liu
Summary: The volatile components CO2 and H2O play a major role in mantle melting and heterogeneity. In this study, Ca isotopes were used to trace the lithological heterogeneity in alkaline magmatic rocks. The results revealed the presence of K-richterite and carbonate components as the source of alkaline magmas with low delta 44/40Ca values. These findings highlight the importance of Ca isotopes as a robust tracer of lithological variation caused by volatiles in the Earth's upper mantle.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Timothee Jautzy, Gilles Rixhon, Regis Braucher, Romain Delunel, Pierre G. Valla, Laurent Schmitt, Aster Team
Summary: Although the current approach to estimate catchment-wide denudation rates using only 10Be concentrations has made significant progress in geomorphology, this study argues for the inclusion of 26Al measurements and testing of steady-state assumptions in slow eroding, formerly glaciated landscapes. The study conducted measurements of both 10Be and 26Al in stream sediments from the Vosges Massif in France and found that elevation, slope, channel steepness, and precipitation were the primary factors controlling denudation rates. The study also revealed a significant relationship between the extent of past glaciation and the cosmogenic (un-)steadiness in the stream sediments.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)
Article
Geochemistry & Geophysics
Erik van der Wiel, Douwe J. J. van Hinsbergen, Cedric Thieulot, Wim Spakman
Summary: Numerical models of Earth's mantle dynamics can predict the vigour and mixing of mantle flow, and the average slab sinking rates are an unexplored parameter that can provide intrinsic information on these characteristics. Through numerical experiments, it has been found that slab sinking rates are strongly correlated with mantle convection and mixing, and may explain geochemical observations from hotspot volcanoes.
EARTH AND PLANETARY SCIENCE LETTERS
(2024)