Articles | Volume 22, issue 9
https://doi.org/10.5194/cp-22-1655-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-22-1655-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Quantifying Southern Hemisphere dust sources during the Last Glacial-Interglacial Transition using rare earth elements in the EPICA Dome C ice core
Sibylle Boxho
CORRESPONDING AUTHOR
Laboratoire G-Time, Département Géosciences, Environnement et Société (DGES), Université Libre de Bruxelles (ULB), Av. F. Roosevelt, 50 (CP 160/02), Brussels, 1050, Belgium
Biogéochimie et Modélisation du Système Terre, Département Géosciences, Environnement et Société (DGES), Université Libre de Bruxelles (ULB), Brussels, 1050, Belgium
Aubry Vanderstraeten
Laboratoire G-Time, Département Géosciences, Environnement et Société (DGES), Université Libre de Bruxelles (ULB), Av. F. Roosevelt, 50 (CP 160/02), Brussels, 1050, Belgium
Laboratoire d'Océanologie et de Géosciences UMR 8187 – LOG, Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, IRD, 59000 Lille, France
Nadine Mattielli
Laboratoire G-Time, Département Géosciences, Environnement et Société (DGES), Université Libre de Bruxelles (ULB), Av. F. Roosevelt, 50 (CP 160/02), Brussels, 1050, Belgium
Goulven G. Laruelle
Biogéochimie et Modélisation du Système Terre, Département Géosciences, Environnement et Société (DGES), Université Libre de Bruxelles (ULB), Brussels, 1050, Belgium
Aloys Bory
Laboratoire d'Océanologie et de Géosciences UMR 8187 – LOG, Univ. Lille, CNRS, Univ. Littoral Côte d'Opale, IRD, 59000 Lille, France
Paolo Gabrielli
Italian Glaciological Committee, c/o University of Turin, Turin, Italy
current address: The Metropolitan Water District of Southern California, Los Angeles, CA, USA
Steeve Bonneville
CORRESPONDING AUTHOR
Biogéochimie et Modélisation du Système Terre, Département Géosciences, Environnement et Société (DGES), Université Libre de Bruxelles (ULB), Brussels, 1050, Belgium
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Noah Liguori-Bills, Catherine E. Scott, Ken S. Carslaw, Natalie Kehrwald, Stijn Hantson, Susan Kaspari, Carlo Barbante, Elena Barbaro, Paolo Gabrielli, Roberta Zangrando, Lonnie G. Thompson, and Douglas S. Hamilton
EGUsphere, https://doi.org/10.5194/egusphere-2026-2728, https://doi.org/10.5194/egusphere-2026-2728, 2026
This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
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Ice cores preserve changes in landscape fires and human-caused combustion. In this study, we compared ice core data from every continent, except Oceania, to computer model simulations of fire. We found a large disagreement in the 1850 CE to 1980 CE black carbon ratio. After exploring changes in emissions, transport, and aerosol microphysical processes as potential reasons for this disagreement, our results suggested that fire emission input datasets for climate models are the primary cause.
Clarissa Baldo, Servanne Chevaillier, Sophie Nowak, Gael Noyalet, Sandra Lafon, Claudia Di Biagio, Amelie Chaput, James King, Mathieu Cazaunau, Edouard Pangui, Jean-Francois Doussin, Remi Stanus, Nadine Mattielli, Heleen C. Vos, Gregory S. Okin, Brigitte Language, Tjaart Van Der Walt, Stuart Piketh, Karine Desboeufs, Akinori Ito, Silvia Becagli, Eugene Marais, Laurie Barrier, Stéphane Jacquemoud, and Paola Formenti
Atmos. Chem. Phys., 26, 10727–10749, https://doi.org/10.5194/acp-26-10727-2026, https://doi.org/10.5194/acp-26-10727-2026, 2026
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Our results show that crustal element ratios and clay contents distinguish dust aerosols from arid western coastal areas and humid eastern inland regions in Southern Africa. This dust contains key micronutrients that can become bioaccessible during atmospheric transport to nearby and remote marine ecosystems. It is also enriched in carbonates and K-feldspar, serving as a source of cloud condensation and ice nuclei, with potential implications ranging from regional to sub-hemispheric scales.
Paolo Gabrielli, Theo M. Jenk, Michele Bertó, Giuliano Dreossi, Daniela Festi, Werner Kofler, Mai Winstrup, Klaus Oeggl, Margit Schwikowski, Barbara Stenni, and Carlo Barbante
Clim. Past, 22, 1037–1055, https://doi.org/10.5194/cp-22-1037-2026, https://doi.org/10.5194/cp-22-1037-2026, 2026
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A low latitude-high altitude Alpine ice core record was obtained in 2011 from the glacier Alto dell’Ortles (Eastern Alps, Italy) and provided evidence of one of the oldest Alpine ice core records spanning the last ~7000 years, back to the last Northern Hemisphere Climatic Optimum. Here we provide a new Alto dell’Ortles chronology of improved accuracy that will allow to constrain Holocene climatic and environmental histories emerging from this high-altitude glacial archive of Central Europe.
Silvia Placitu, Sebastiaan J. van de Velde, Astrid Hylén, Mats Eriksson, Per O. J. Hall, and Steeve Bonneville
Biogeosciences, 22, 8065–8076, https://doi.org/10.5194/bg-22-8065-2025, https://doi.org/10.5194/bg-22-8065-2025, 2025
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Marine sediments store organic carbon and help regulate climate. Oxygen-depleted waters are thought to enhance this, however Western Gotland Basin sediments show low carbon despite such conditions. We studied the role of mineral protection, which can shield carbon from microbes, and found it limited. This suggests that without physical protection, carbon remains accessible and gets degraded, making mineral protection a key factor in carbon preservation.
Tiziana Lazzarina Zendrini, Luca Carturan, Michael Lehning, Mathias Bavay, Federico Cazorzi, Paolo Gabrielli, Nander Wever, and Giancarlo Dalla Fontana
EGUsphere, https://doi.org/10.5194/egusphere-2025-5186, https://doi.org/10.5194/egusphere-2025-5186, 2025
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By combining in situ mass balance data with a physics‐based snow model at Mt. Ortles, in the Italian Alps, we investigate snow accumulation, erosion and melt processes, and their sensitivity to air temperature. We found that wind erosion is currently the major ablation process at this high-elevation site, whereas melt plays a minor role. Quickly rising air temperature is affecting this partitioning and suggests a future shift from an erosion-dominated to a melt-dominated mass balance regime.
Manon Maisonnier, Maoyuan Feng, David Bastviken, Sandra Arndt, Ronny Lauerwald, Aidin Jabbari, Goulven Gildas Laruelle, Murray D. MacKay, Zeli Tan, Wim Thiery, and Pierre Regnier
Earth Syst. Dynam., 16, 1779–1808, https://doi.org/10.5194/esd-16-1779-2025, https://doi.org/10.5194/esd-16-1779-2025, 2025
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A new process-based modelling framework, FLaMe-v1.0 (Fluxes of Lake Methane version 1.0), is developed to simulate methane (CH4) emissions from lakes at large scales. FLaMe couples the dynamics of organic carbon, oxygen and methane in lakes and rests on an innovative, computationally efficient lake clustering approach for the simulation of CH4 emissions across a large number of lakes. The model evaluation suggests that FLaMe captures the sub-annual and spatial variability of CH4 emissions well.
Luca Carturan, Alexander C. Ihle, Federico Cazorzi, Tiziana Lazzarina Zendrini, Fabrizio De Blasi, Giancarlo Dalla Fontana, Giuliano Dreossi, Daniela Festi, Bryan Mark, Klaus Dieter Oeggl, Roberto Seppi, Barbara Stenni, and Paolo Gabrielli
The Cryosphere, 19, 3443–3458, https://doi.org/10.5194/tc-19-3443-2025, https://doi.org/10.5194/tc-19-3443-2025, 2025
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Paleoclimatic glacial archives in low-latitude mountains are increasingly affected by melt, causing heavy percolation and removing snow and firn accumulated across months, seasons, or even years. Here we present a proxy system model that explicitly accounts for melt in ice and firn cores. Compared to traditional annual layer counting, the model significantly improved the interpretation and annual dating of the Mt Ortles firn core, in the Italian Alps, which includes the very warm summer of 2003.
Nicolás J. Cosentino, Gabriela Torre, Fabrice Lambert, Samuel Albani, François De Vleeschouwer, and Aloys J.-M. Bory
Earth Syst. Sci. Data, 16, 941–959, https://doi.org/10.5194/essd-16-941-2024, https://doi.org/10.5194/essd-16-941-2024, 2024
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One of the main uncertainties related to future climate change has to do with how aerosols interact with climate. Dust is the most abundant aerosol in the atmosphere by mass. In order to better understand the links between dust and climate, we can turn to geological archives of ancient dust. Paleo±Dust is a compilation of measured values of the paleo-dust deposition rate. We can use this compilation to guide climate models so that they better represent dust–climate interactions.
Alizée Roobaert, Pierre Regnier, Peter Landschützer, and Goulven G. Laruelle
Earth Syst. Sci. Data, 16, 421–441, https://doi.org/10.5194/essd-16-421-2024, https://doi.org/10.5194/essd-16-421-2024, 2024
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The quantification of the coastal air–sea CO2 exchange (FCO2) has improved in recent years, but its multiannual variability remains unclear. This study, based on interpolated observations, reconstructs the longest global time series of coastal FCO2 (1982–2020). Results show the coastal ocean acts as a CO2 sink, with increasing intensity over time. This new coastal FCO2-product allows establishing regional carbon budgets and provides new constraints for closing the global carbon cycle.
Luca Carturan, Fabrizio De Blasi, Roberto Dinale, Gianfranco Dragà, Paolo Gabrielli, Volkmar Mair, Roberto Seppi, David Tonidandel, Thomas Zanoner, Tiziana Lazzarina Zendrini, and Giancarlo Dalla Fontana
Earth Syst. Sci. Data, 15, 4661–4688, https://doi.org/10.5194/essd-15-4661-2023, https://doi.org/10.5194/essd-15-4661-2023, 2023
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This paper presents a new dataset of air, englacial, soil surface and rock wall temperatures collected between 2010 and 2016 on Mt Ortles, which is the highest summit of South Tyrol, Italy. Details are provided on instrument type and characteristics, field methods, and data quality control and assessment. The obtained data series are available through an open data repository. This is a rare dataset from a summit area lacking observations on permafrost and glaciers and their climatic response.
Paolo Gabrielli, Theo Manuel Jenk, Michele Bertó, Giuliano Dreossi, Daniela Festi, Werner Kofler, Mai Winstrup, Klaus Oeggl, Margit Schwikowski, Barbara Stenni, and Carlo Barbante
Clim. Past Discuss., https://doi.org/10.5194/cp-2022-20, https://doi.org/10.5194/cp-2022-20, 2022
Revised manuscript not accepted
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We present a methodology that reduces the chronological uncertainty of an Alpine ice core record from the glacier Alto dell’Ortles, Italy. This chronology will allow the constraint of the Holocene climatic and environmental histories emerging from this archive of Central Europe. This method will allow to obtain accurate chronologies also from other ice cores from-low latitude/high-altitude glaciers that typically suffer from larger dating uncertainties compared with well dated polar records.
Xi Wei, Josette Garnier, Vincent Thieu, Paul Passy, Romain Le Gendre, Gilles Billen, Maia Akopian, and Goulven Gildas Laruelle
Biogeosciences, 19, 931–955, https://doi.org/10.5194/bg-19-931-2022, https://doi.org/10.5194/bg-19-931-2022, 2022
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Estuaries are key reactive ecosystems along the land–ocean aquatic continuum and are often strongly impacted by anthropogenic activities. We calculated nutrient in and out fluxes by using a 1-D transient model for seven estuaries along the French Atlantic coast. Among these, large estuaries with high residence times showed higher retention rates than medium and small ones. All reveal coastal eutrophication due to the excess of diffused nitrogen from intensive agricultural river basins.
Alizée Roobaert, Laure Resplandy, Goulven G. Laruelle, Enhui Liao, and Pierre Regnier
Ocean Sci., 18, 67–88, https://doi.org/10.5194/os-18-67-2022, https://doi.org/10.5194/os-18-67-2022, 2022
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This study uses a global oceanic model to investigate the seasonal dynamics of the sea surface partial pressure of CO2 (pCO2) in the global coastal ocean. Our method quantifies the respective effects of thermal changes, biological activity, ocean circulation and freshwater fluxes on the temporal pCO2 variations. The performance of our model is also evaluated against a data product derived from observations to identify coastal regions where our approach is most robust.
Amanda R. Fay, Luke Gregor, Peter Landschützer, Galen A. McKinley, Nicolas Gruber, Marion Gehlen, Yosuke Iida, Goulven G. Laruelle, Christian Rödenbeck, Alizée Roobaert, and Jiye Zeng
Earth Syst. Sci. Data, 13, 4693–4710, https://doi.org/10.5194/essd-13-4693-2021, https://doi.org/10.5194/essd-13-4693-2021, 2021
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The movement of carbon dioxide from the atmosphere to the ocean is estimated using surface ocean carbon (pCO2) measurements and an equation including variables such as temperature and wind speed; the choices of these variables lead to uncertainties. We introduce the SeaFlux ensemble which provides carbon flux maps calculated in a consistent manner, thus reducing uncertainty by using common choices for wind speed and a set definition of "global" coverage.
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Short summary
We present a high-resolution, quantitative reconstruction of dust provenance in the EPICA Dome C ice core (33.7–2.8 kyr BP) using Rare Earth Elements (REE). Dust was mainly sourced from Patagonia during glacial periods, shifting toward Australia, Southern Africa, and the Puna-Altiplano after 14.5 kyr BP due to sea-level rise and hydrological rearrangement in Patagonia. These changes also reflect major reorganizations of Southern Hemisphere atmospheric circulation.
We present a high-resolution, quantitative reconstruction of dust provenance in the EPICA Dome C...