Articles | Volume 17, issue 5
https://doi.org/10.5194/cp-17-1881-2021
© Author(s) 2021. 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-17-1881-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
23 Sep 2021
Research article |
| 23 Sep 2021
| 23 Sep 2021
The triple oxygen isotope composition of phytoliths, a new proxy of atmospheric relative humidity: controls of soil water isotope composition, temperature, CO2 concentration and relative humidity
Clément Outrequin
CNRS, Aix Marseille Univ, IRD, INRA, CEREGE, Aix-en-Provence, France
CNRS, Aix Marseille Univ, IRD, INRA, CEREGE, Aix-en-Provence, France
Christine Vallet-Coulomb
CNRS, Aix Marseille Univ, IRD, INRA, CEREGE, Aix-en-Provence, France
Clément Piel
Ecotron Européen de Montpellier, Univ. Montpellier, UPS 3248 CNRS, Campus Baillarguet, Montferrier-sur-Lez, France
Sébastien Devidal
Ecotron Européen de Montpellier, Univ. Montpellier, UPS 3248 CNRS, Campus Baillarguet, Montferrier-sur-Lez, France
Amaelle Landais
Laboratoire des Sciences du Climat et de l'Environnement
(LSCE/IPSL/CEA/CNRS/UVSQ), Gif-sur-Yvette, France
Martine Couapel
CNRS, Aix Marseille Univ, IRD, INRA, CEREGE, Aix-en-Provence, France
Jean-Charles Mazur
CNRS, Aix Marseille Univ, IRD, INRA, CEREGE, Aix-en-Provence, France
Christophe Peugeot
Hydrosciences Montpellier, IRD, CNRS, Univ. Montpellier, Montpellier, France
Monique Pierre
Laboratoire des Sciences du Climat et de l'Environnement
(LSCE/IPSL/CEA/CNRS/UVSQ), Gif-sur-Yvette, France
Frédéric Prié
Laboratoire des Sciences du Climat et de l'Environnement
(LSCE/IPSL/CEA/CNRS/UVSQ), Gif-sur-Yvette, France
Jacques Roy
Ecotron Européen de Montpellier, Univ. Montpellier, UPS 3248 CNRS, Campus Baillarguet, Montferrier-sur-Lez, France
Corinne Sonzogni
CNRS, Aix Marseille Univ, IRD, INRA, CEREGE, Aix-en-Provence, France
Claudia Voigt
CNRS, Aix Marseille Univ, IRD, INRA, CEREGE, Aix-en-Provence, France
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EGUsphere, https://doi.org/10.5194/egusphere-2026-5233, https://doi.org/10.5194/egusphere-2026-5233, 2026
This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
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A seven-year precipitation isotope record from the West African Monsoon reveals that triple oxygen isotope composition is strongly influenced by convective organization, while also retaining a weaker signature of continental moisture recycling. The combined use of δ¹⁸O, d-excess and ¹⁷O-excess provides new observational constraints on the processes shaping tropical precipitation isotopes.
Adrien Ooms, Mathieu Casado, Sonja Wahl, Thomas Laepple, Alexandra Zuhr, Pete Akers, Ghislain Picard, Laurent Arnaud, Joel Savarino, Kira Rehfeld, Barbara Stenni, Giuliano Dreossi, Mauro Masiol, Amaelle Landais, and Valérie Masson-Delmotte
EGUsphere, https://doi.org/10.5194/egusphere-2026-4801, https://doi.org/10.5194/egusphere-2026-4801, 2026
This preprint is open for discussion and under review for Climate of the Past (CP).
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This work presents new insights in the archival process of multi-annual climatic signal in the near surface firn at Concordia Station, East-Antarctica, from the new data set of high resolution stable water isotope profiles measured in a snow trench. The dated isotopic profiles covering 20 years are compared against overlapping precipitation and surface snow observations. This highlights the strong contribution of stratigraphic noise and post depositional effects to individual trench profiles.
Nathan Rispal, Bruno Arfib, Philippe Audra, Pierre Henry, Benoît Viguier, Alexandre Zappelli, Ludovic Mocochain, Marianna Jagercikova, Christine Vallet-Coulomb, Hélène Miche, Laurent Cadilhac, Vianney Sivelle, and Olivier Delestre
Hydrol. Earth Syst. Sci., 30, 4699–4720, https://doi.org/10.5194/hess-30-4699-2026, https://doi.org/10.5194/hess-30-4699-2026, 2026
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In mountain karst regions, seasonal snow is a key component of groundwater recharge, making them highly vulnerable to climate change. Using a rainfall-snow-discharge model in the southern French Alps, we show that warming shifts high-flow periods and causes a strong summer flow decline. Rapid karst flow paths lead to quick spring responses, limiting storage above the base level and increasing sensitivity to future hydrological change.
Thomas Lauwers, Elise Fourré, Niels Dutrievoz, Cécile Agosta, Olivier Jossoud, Bénédicte Minster, Frédéric Prié, Olivier Cattani, Valérie Masson-Delmotte, Mathieu Casado, Christophe Genthon, and Amaëlle Landais
Atmos. Meas. Tech., 19, 4743–4758, https://doi.org/10.5194/amt-19-4743-2026, https://doi.org/10.5194/amt-19-4743-2026, 2026
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This study presents a new method to measure the isotopic composition of snowfall and atmospheric water vapor in Antarctica. With a single laser spectrometer, it enables continuous, high frequency observations without human intervention. Tests in East Antarctica show a very good agreement with conventionnal snow sampling. This new sampling method opens new opportunities to better understand snowfall formation, improve climate models, and refine the interpretation of ice core climate records.
Amy C. F. King, Thomas K. Bauska, Amaëlle Landais, Carlos Martín, and Eric W. Wolff
Clim. Past, 22, 1291–1304, https://doi.org/10.5194/cp-22-1291-2026, https://doi.org/10.5194/cp-22-1291-2026, 2026
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We show how measurements of nitrogen isotopes in Antarctic ice core records can be used to show dramatic thinning of an ice sheet during ice mass changes in the Holocene. Combining such measurements with proxies for ice sheet elevation could be a powerful tool for constraining the history of ice dynamics at sites which are sensitive to rapid changes, and could contribute to constraining ice sheet models.
Claudia Voigt, Christine Vallet-Coulomb, Clément Piel, Joana Sauze, Ilja M. Reiter, Jean-Philippe Orts, Françoise Chalié, Christophe Cassou, Irène Xueref-Remy, and Anne Alexandre
Atmos. Chem. Phys., 26, 9295–9335, https://doi.org/10.5194/acp-26-9295-2026, https://doi.org/10.5194/acp-26-9295-2026, 2026
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Triple oxygen isotopes (17O-excess) are an upcoming tool in hydrological studies. We present the first one-year high-resolution record of 17O-excess in atmospheric water vapor from a Mediterranean forest site. The dataset provides insights into the processes driving variability of 17O-excess in atmospheric water vapor and precipitation across seasonal, diurnal, and event scales. These findings support model validation efforts and enhance the interpretation of paleoclimate archives.
Agnese Petteni, Mathieu Casado, Christophe Leroy-Dos Santos, Amaelle Landais, Niels Dutrievoz, Cécile Agosta, Pete D. Akers, Joel Savarino, Andrea Spolaor, Massimo Frezzotti, and Barbara Stenni
The Cryosphere, 20, 3581–3598, https://doi.org/10.5194/tc-20-3581-2026, https://doi.org/10.5194/tc-20-3581-2026, 2026
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We investigated the isotopic composition of surface snow in a previously unexplored region of East Antarctica to understand how differences in air mass origin influence its variability. By comparing observations with model data, we validated the model and quantified the impact of post-depositional processes at the snow–atmosphere interface. Our results offer valuable insights for reconstructing past temperatures from ice cores.
Yohan Lichterfeld, Guillaume Leduc, Kaustubh Thirumalai, Laurence Vidal, Thibault de Garidel-Thoron, Corinne Sonzogni, and Clara Bolton
EGUsphere, https://doi.org/10.5194/egusphere-2026-2343, https://doi.org/10.5194/egusphere-2026-2343, 2026
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The Indian Ocean regulates global climate through heat and moisture exchanges. To understand past climate variability, we analyzed oxygen isotopes in individual fossil shells of tiny marine organisms. Combining numerical simulations, we show that shell chemistry reflects seasonal temperature changes driven by both the monsoon and the Indian Ocean Dipole. This opens new perspectives for reconstructing past climate extreme events.
Nicolas Bienville, Amaelle Landais, Sarah Fiorini, Clément Piel, Joana Sauze, Benoit Lemaire, Nicolas Geyskens, Frederic Prie, Olivier Jossoud, Clémence Paul, Justin Chaillot, Thomas Lauwers, Simon Chollet, Samuel Abiven, and Arnaud Dapoigny
EGUsphere, https://doi.org/10.5194/egusphere-2026-1369, https://doi.org/10.5194/egusphere-2026-1369, 2026
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This study describes an instrumented system of 4 closed aquatic biological chambers that allows determination of the oxygen isotopic fractionation factors of aquatic biosphere in controlled realistic conditions. We validated our system with a freshwater algae species and determined its ¹⁸O/¹⁶O isotopic discrimination during respiration to be −30 ‰, in the upper range of previously published values.
Joana Sauze, Marie-Laure Tiouchichine, Alexandru Milcu, and Clément Piel
Atmos. Meas. Tech., 19, 2265–2277, https://doi.org/10.5194/amt-19-2265-2026, https://doi.org/10.5194/amt-19-2265-2026, 2026
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We present a simple workflow for high-precision δ¹³C-CO₂ analysis from 1 mL air samples using cryogenic pre-concentration and continuous-flow isotope-ratio mass spectrometry (IRMS). The method combines vial conditioning, dual sealing, and −80 °C storage to minimise gas loss. It achieves ±0.1 ‰ precision and stable isotopic values for up to one week of storage. This low-cost approach enables high-frequency δ¹³C-CO₂ measurements in volume-limited systems such as microcosm or chamber experiments.
Héloïse Guilluy, Émilie Capron, Frédéric Parrenin, Vladimir Lipenkov, Jochen Schmitt, Patricia Martinerie, Zhipeng Wu, Qiuzhen Yin, Anna Maria Klüssendorf, Amaëlle Landais, Barbara Seth, Hubertus Fischer, and Dominique Raynaud
EGUsphere, https://doi.org/10.5194/egusphere-2026-953, https://doi.org/10.5194/egusphere-2026-953, 2026
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Air bubbles in polar ice cores retain information about past climates over hundreds of thousands of years. The total air content (TAC) trapped within these bubbles varies with summer insolation cycles, making it a tool for dating ice cores. We present a multi-site update on TAC, combining new and published data. We confirm that insolation impacts bubble volume in East Antarctica, but surface climate changes can hide the insolation signal in the TAC record, impacting the TAC-derived chronologies.
Titouan Tcheng, Elise Fourré, Christophe Leroy-Dos Santos, Frédéric Parrenin, Emmanuel Le Meur, Frédéric Prié, Olivier Jossoud, Roxanne Jacob, Bénédicte Minster, Olivier Magand, Cécile Agosta, Niels Dutrievoz, Vincent Favier, Léa Baubant, Coralie Lassalle-Bernard, Mathieu Casado, Martin Werner, Alexandre Cauquoin, Laurent Arnaud, Bruno Jourdain, Ghislain Picard, Marie Bouchet, and Amaëlle Landais
The Cryosphere, 20, 1599–1618, https://doi.org/10.5194/tc-20-1599-2026, https://doi.org/10.5194/tc-20-1599-2026, 2026
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Studying Antarctic ice cores is crucial to assess past climate changes, as they hold historical climate data. This study examines multiple ice cores from three sites in coastal Adélie Land to see if combining cores improves data interpretability. It does at two sites, but at a third, wind-driven snow layer mixing limited benefits. We show that using multiple ice cores from one location can better uncover climate history, especially in areas with less wind disturbance.
Emma Samin, Amaëlle Landais, Elise Fourré, Mathieu Casado, Adrien Ooms, Niels Dutrievoz, Cécile Agosta, Valérie Masson-Delmotte, Thomas Combacal, Elsa Gautier, and Bénédicte Minster
EGUsphere, https://doi.org/10.5194/egusphere-2026-871, https://doi.org/10.5194/egusphere-2026-871, 2026
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This study presents the water isotope profiles of two firn cores drilled at Little Dome C (LDC) in Antarctica and dated by identifying volcanic events, which enabled us to determine an accumulation rate at LDC of 24 mmwe.yr-1. Comparison of a virtual firn core model with these data allowed us to study the surface processes responsible for isotopic variability in firn. We therefore suggest that future models consider the mixing of the surface layer and re-quantify diffusion.
Erwan Le Roux, Valentin Wendling, Gérémy Panthou, Océane Dubas, Jean-Pierre Vandervaere, Basile Hector, Guillaume Favreau, Jean-Martial Cohard, Caroline Pierre, Luc Descroix, Eric Mougin, Manuela Grippa, Laurent Kergoat, Jérôme Demarty, Nathalie Rouche, Jordi Etchanchu, and Christophe Peugeot
Hydrol. Earth Syst. Sci., 30, 929–944, https://doi.org/10.5194/hess-30-929-2026, https://doi.org/10.5194/hess-30-929-2026, 2026
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In hydrological science, better accounting for regime shift (abrupt and/or irreversible changes) remains a challenge that could lead to a new paradigm for the adaptation to extreme events (flood , drought). In this article, we present a simple model that can account for a hydrological regime shift in Sahelian watersheds. Based on this model, we find that the Gorouol, Dargol, Nakanbé, and Sirba watersheds have shifted during the droughts of the '70s–'80s.
Niels Dutrievoz, Cécile Agosta, Cécile Davrinche, Amaëlle Landais, Sebastien Nguyen, Étienne Vignon, Inès Ollivier, Christophe Leroy-Dos Santos, Elise Fourré, Mathieu Casado, Jonathan Wille, Vincent Favier, Bénédicte Minster, and Frédéric Prié
The Cryosphere, 20, 1025–1046, https://doi.org/10.5194/tc-20-1025-2026, https://doi.org/10.5194/tc-20-1025-2026, 2026
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In December 2018, an atmospheric river event from the Atlantic reached Dome C, East Antarctica, causing a +18 °C warming, tripled water vapour, and a strong isotopic anomaly in water vapour (+ 17 ‰ for δ18O) at the surface. During the peak of the event, we found 70 % of the water vapour came from local snow sublimation, and 30 % from the atmospheric river itself, highlighting both long-range moisture advection and interactions between the boundary layer and the snowpack.
Inès Ollivier, Thomas Lauwers, Niels Dutrievoz, Cécile Agosta, Mathieu Casado, Elise Fourré, Christophe Genthon, Olivier Jossoud, Frédéric Prié, Hans Christian Steen-Larsen, and Amaëlle Landais
Earth Syst. Sci. Data, 17, 5655–5674, https://doi.org/10.5194/essd-17-5655-2025, https://doi.org/10.5194/essd-17-5655-2025, 2025
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We present a novel 2.5-month record of the atmospheric water vapour isotopic composition during the austral summer 2023–2024 at Concordia Station on the Antarctic Plateau. We show that two independent laser spectrometers accurately record the diurnal variability of the atmospheric water vapour 𝛿18O, 𝛿D, and d-excess. We compare the measurements against outputs of the isotope-enabled general circulation model LMDZ6-iso to show how the data can be used to evaluate such models.
Agnese Petteni, Elise Fourré, Elsa Gautier, Azzurra Spagnesi, Roxanne Jacob, Pete D. Akers, Daniele Zannoni, Jacopo Gabrieli, Olivier Jossoud, Frédéric Prié, Amaëlle Landais, Titouan Tcheng, Barbara Stenni, Joel Savarino, Patrick Ginot, and Mathieu Casado
Atmos. Meas. Tech., 18, 5435–5455, https://doi.org/10.5194/amt-18-5435-2025, https://doi.org/10.5194/amt-18-5435-2025, 2025
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Our research compares three systems of continuous flow analysis coupled with cavity ring-down spectrometry (CFA-CRD) from Venice, Paris, and Grenoble laboratories for measuring water isotopes in ice cores, crucial for reconstructing past climate. We quantify each system’s mixing and measurement noise effects, which impact the achievable resolution of isotope continuous records. Our findings reveal specific configurations and procedures to enhance measurement accuracy, providing a framework to optimise water isotope analysis.
Clémence Paul, Clément Piel, Joana Sauze, Olivier Jossoud, Arnaud Dapoigny, Daniele Romanini, Frédéric Prié, Sébastien Devidal, Roxanne Jacob, Alexandru Milcu, and Amaëlle Landais
Geosci. Instrum. Method. Data Syst., 14, 91–101, https://doi.org/10.5194/gi-14-91-2025, https://doi.org/10.5194/gi-14-91-2025, 2025
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Our study investigated the influence of plant processes on oxygen dynamics, crucial for paleoclimatology. By examining maize respiration and photosynthesis using advanced techniques, we enhanced our understanding of past climates through ice core analysis.
Claudia Voigt, Fernando Gázquez, Lucía Martegani, Ana Isabel Sánchez Villanueva, Antonio Medina, Rosario Jiménez-Espinosa, Juan Jiménez-Millán, and Miguel Rodríguez-Rodríguez
Hydrol. Earth Syst. Sci., 29, 1783–1806, https://doi.org/10.5194/hess-29-1783-2025, https://doi.org/10.5194/hess-29-1783-2025, 2025
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This research explores the use of a new isotope tracer, 17O excess, to better understand how hydrological processes drive large seasonal water level changes in small lakes in semiarid regions. The study shows that triple oxygen isotopes offer a more detailed understanding of these changes compared to traditional methods. These findings are valuable for reconstructing past climates and predicting how climate change, influenced by human activity, will affect small lakes in these dry areas.
Thomas Lauwers, Elise Fourré, Olivier Jossoud, Daniele Romanini, Frédéric Prié, Giordano Nitti, Mathieu Casado, Kévin Jaulin, Markus Miltner, Morgane Farradèche, Valérie Masson-Delmotte, and Amaëlle Landais
Atmos. Meas. Tech., 18, 1135–1147, https://doi.org/10.5194/amt-18-1135-2025, https://doi.org/10.5194/amt-18-1135-2025, 2025
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Water vapour isotopes are important tools to better understand processes governing the atmospheric hydrological cycle. In polar regions, their measurement helps to improve the interpretation of water isotopic records in ice cores. However, in situ water vapour isotopic monitoring is an important challenge, especially in dry places of East Antarctica. We present here an alternative laser spectroscopy technique adapted for such measurements, with a limit of detection down to 10 ppm humidity.
Inès Ollivier, Hans Christian Steen-Larsen, Barbara Stenni, Laurent Arnaud, Mathieu Casado, Alexandre Cauquoin, Giuliano Dreossi, Christophe Genthon, Bénédicte Minster, Ghislain Picard, Martin Werner, and Amaëlle Landais
The Cryosphere, 19, 173–200, https://doi.org/10.5194/tc-19-173-2025, https://doi.org/10.5194/tc-19-173-2025, 2025
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The role of post-depositional processes taking place at the ice sheet's surface on the water stable isotope signal measured in polar ice cores is not fully understood. Using field observations and modelling results, we show that the original precipitation isotopic signal at Dome C, East Antarctica, is modified by post-depositional processes and provide the first quantitative estimation of their mean impact on the isotopic signal observed in the snow.
Frédéric Parrenin, Marie Bouchet, Christo Buizert, Emilie Capron, Ellen Corrick, Russell Drysdale, Kenji Kawamura, Amaëlle Landais, Robert Mulvaney, Ikumi Oyabu, and Sune Olander Rasmussen
Geosci. Model Dev., 17, 8735–8750, https://doi.org/10.5194/gmd-17-8735-2024, https://doi.org/10.5194/gmd-17-8735-2024, 2024
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The Paleochrono-1.1 probabilistic dating model allows users to derive a common and optimized chronology for several paleoclimatic sites from various archives (ice cores, speleothems, marine cores, lake cores, etc.). It combines prior sedimentation scenarios with chronological information such as dated horizons, dated intervals, stratigraphic links and (for ice cores) Δdepth observations. Paleochrono-1.1 is available under an open-source license.
Clément Piel, Daniele Romanini, Morgane Farradèche, Justin Chaillot, Clémence Paul, Nicolas Bienville, Thomas Lauwers, Joana Sauze, Kévin Jaulin, Frédéric Prié, and Amaëlle Landais
Atmos. Meas. Tech., 17, 6647–6658, https://doi.org/10.5194/amt-17-6647-2024, https://doi.org/10.5194/amt-17-6647-2024, 2024
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This paper introduces a new optical gas analyzer based on an optical-feedback cavity-enhanced absorption spectroscopy (OF-CEAS) technique enabling high-temporal-resolution and high-precision measurements of oxygen isotopes (δ18O) and dioxygen (O2) concentration of atmospheric O2 (respectively 0.06 ‰ and 0.002 % over 10 min integration). The results underscore the good agreement with isotope ratio mass spectrometry measurements and the ability of the instrument to monitor biological processes.
Giuliano Dreossi, Mauro Masiol, Barbara Stenni, Daniele Zannoni, Claudio Scarchilli, Virginia Ciardini, Mathieu Casado, Amaëlle Landais, Martin Werner, Alexandre Cauquoin, Giampietro Casasanta, Massimo Del Guasta, Vittoria Posocco, and Carlo Barbante
The Cryosphere, 18, 3911–3931, https://doi.org/10.5194/tc-18-3911-2024, https://doi.org/10.5194/tc-18-3911-2024, 2024
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Oxygen and hydrogen stable isotopes have been extensively used to reconstruct past temperatures, with precipitation representing the input signal of the isotopic records in ice cores. We present a 10-year record of stable isotopes in daily precipitation at Concordia Station: this is the longest record for inland Antarctica and represents a benchmark for quantifying post-depositional processes and improving the paleoclimate interpretation of ice cores.
Romilly Harris Stuart, Amaëlle Landais, Laurent Arnaud, Christo Buizert, Emilie Capron, Marie Dumont, Quentin Libois, Robert Mulvaney, Anaïs Orsi, Ghislain Picard, Frédéric Prié, Jeffrey Severinghaus, Barbara Stenni, and Patricia Martinerie
The Cryosphere, 18, 3741–3763, https://doi.org/10.5194/tc-18-3741-2024, https://doi.org/10.5194/tc-18-3741-2024, 2024
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Ice core δO2/N2 records are useful dating tools due to their local insolation pacing. A precise understanding of the physical mechanism driving this relationship, however, remain ambiguous. By compiling data from 15 polar sites, we find a strong dependence of mean δO2/N2 on accumulation rate and temperature in addition to the well-documented insolation dependence. Snowpack modelling is used to investigate which physical properties drive the mechanistic dependence on these local parameters.
Mathieu Casado, Amaelle Landais, Tim Stoltmann, Justin Chaillot, Mathieu Daëron, Fréderic Prié, Baptiste Bordet, and Samir Kassi
Atmos. Meas. Tech., 17, 4599–4612, https://doi.org/10.5194/amt-17-4599-2024, https://doi.org/10.5194/amt-17-4599-2024, 2024
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Measuring water isotopic composition in Antarctica is difficult because of the extremely cold temperature in winter. Here, we designed a new infrared spectrometer able to measure the vapour isotopic composition during more than 95 % of the year in the coldest locations of Antarctica, whereas current commercial instruments are only able to measure during the warm summer months in the interior.
Amaelle Landais, Cécile Agosta, Françoise Vimeux, Olivier Magand, Cyrielle Solis, Alexandre Cauquoin, Niels Dutrievoz, Camille Risi, Christophe Leroy-Dos Santos, Elise Fourré, Olivier Cattani, Olivier Jossoud, Bénédicte Minster, Frédéric Prié, Mathieu Casado, Aurélien Dommergue, Yann Bertrand, and Martin Werner
Atmos. Chem. Phys., 24, 4611–4634, https://doi.org/10.5194/acp-24-4611-2024, https://doi.org/10.5194/acp-24-4611-2024, 2024
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We have monitored water vapor isotopes since January 2020 on Amsterdam Island in the Indian Ocean. We show 11 periods associated with abrupt negative excursions of water vapor δ18Ο. Six of these events show a decrease in gaseous elemental mercury, suggesting subsidence of air from a higher altitude. Accurately representing the water isotopic signal during these cold fronts is a real challenge for the atmospheric components of Earth system models equipped with water isotopes.
Philip Meister, Anne Alexandre, Hannah Bailey, Philip Barker, Boris K. Biskaborn, Ellie Broadman, Rosine Cartier, Bernhard Chapligin, Martine Couapel, Jonathan R. Dean, Bernhard Diekmann, Poppy Harding, Andrew C. G. Henderson, Armand Hernandez, Ulrike Herzschuh, Svetlana S. Kostrova, Jack Lacey, Melanie J. Leng, Andreas Lücke, Anson W. Mackay, Eniko Katalin Magyari, Biljana Narancic, Cécile Porchier, Gunhild Rosqvist, Aldo Shemesh, Corinne Sonzogni, George E. A. Swann, Florence Sylvestre, and Hanno Meyer
Clim. Past, 20, 363–392, https://doi.org/10.5194/cp-20-363-2024, https://doi.org/10.5194/cp-20-363-2024, 2024
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This paper presents the first comprehensive compilation of diatom oxygen isotope records in lake sediments (δ18OBSi), supported by lake basin parameters. We infer the spatial and temporal coverage of δ18OBSi records and discuss common hemispheric trends on centennial and millennial timescales. Key results are common patterns for hydrologically open lakes in Northern Hemisphere extratropical regions during the Holocene corresponding to known climatic epochs, i.e. the Holocene Thermal Maximum.
Jérôme Texier, Julio Gonçalvès, Thomas Stieglitz, Christine Vallet-Coulomb, Jérôme Labille, Vincent Marc, Angélique Poulain, and Philippe Dussouillez
Hydrol. Earth Syst. Sci. Discuss., https://doi.org/10.5194/hess-2023-239, https://doi.org/10.5194/hess-2023-239, 2024
Manuscript not accepted for further review
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Understanding the relationship between rivers and alluvial aquifers is crucial, yet challenging. Through a combined approach of tracing and modeling in a French Rhône River site, we reveal significant insights. We quantify the impact of pumping on water flow and identify the primary water sources. Our findings aid sustainable water management in regions facing similar challenges, offering practical guidance for policymakers on groundwater use.
Christophe Leroy-Dos Santos, Elise Fourré, Cécile Agosta, Mathieu Casado, Alexandre Cauquoin, Martin Werner, Benedicte Minster, Frédéric Prié, Olivier Jossoud, Leila Petit, and Amaëlle Landais
The Cryosphere, 17, 5241–5254, https://doi.org/10.5194/tc-17-5241-2023, https://doi.org/10.5194/tc-17-5241-2023, 2023
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In the face of global warming, understanding the changing water cycle and temperatures in polar regions is crucial. These factors directly impact the balance of ice sheets in the Arctic and Antarctic. By studying the composition of water vapor, we gain insights into climate variations. Our 2-year study at Dumont d’Urville station, Adélie Land, offers valuable data to refine models. Additionally, we demonstrate how modeling aids in interpreting signals from ice core samples in the region.
Marie Bouchet, Amaëlle Landais, Antoine Grisart, Frédéric Parrenin, Frédéric Prié, Roxanne Jacob, Elise Fourré, Emilie Capron, Dominique Raynaud, Vladimir Ya Lipenkov, Marie-France Loutre, Thomas Extier, Anders Svensson, Etienne Legrain, Patricia Martinerie, Markus Leuenberger, Wei Jiang, Florian Ritterbusch, Zheng-Tian Lu, and Guo-Min Yang
Clim. Past, 19, 2257–2286, https://doi.org/10.5194/cp-19-2257-2023, https://doi.org/10.5194/cp-19-2257-2023, 2023
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A new federative chronology for five deep polar ice cores retrieves 800 000 years of past climate variations with improved accuracy. Precise ice core timescales are key to studying the mechanisms linking changes in the Earth’s orbit to the diverse climatic responses (temperature and atmospheric greenhouse gas concentrations). To construct the chronology, new measurements from the oldest continuous ice core as well as glaciological modeling estimates were combined in a statistical model.
Claudia Voigt, Anne Alexandre, Ilja M. Reiter, Jean-Philippe Orts, Christine Vallet-Coulomb, Clément Piel, Jean-Charles Mazur, Julie C. Aleman, Corinne Sonzogni, Helene Miche, and Jérôme Ogée
Biogeosciences, 20, 2161–2187, https://doi.org/10.5194/bg-20-2161-2023, https://doi.org/10.5194/bg-20-2161-2023, 2023
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Data on past relative humidity (RH) ARE needed to improve its representation in Earth system models. A novel isotope parameter (17O-excess) of plant silica has been developed to quantify past RH. Using comprehensive monitoring and novel methods, we show how environmental and plant physiological parameters influence the 17O-excess of plant silica and leaf water, i.e. its source water. The insights gained from this study will help to improve estimates of RH from fossil plant silica deposits.
Aymeric P. M. Servettaz, Anaïs J. Orsi, Mark A. J. Curran, Andrew D. Moy, Amaelle Landais, Joseph R. McConnell, Trevor J. Popp, Emmanuel Le Meur, Xavier Faïn, and Jérôme Chappellaz
Clim. Past, 19, 1125–1152, https://doi.org/10.5194/cp-19-1125-2023, https://doi.org/10.5194/cp-19-1125-2023, 2023
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The temperature of the past 2000 years is still poorly known in vast parts of the East Antarctic plateau. In this study, we present temperature reconstructions based on water and gas stable isotopes from the Aurora Basin North ice core. Spatial and temporal significance of each proxy differs, and we can identify some cold periods in the snow temperature up to 2°C cooler in the 1000–1400 CE period, which could not be determined with water isotopes only.
Robert Mulvaney, Eric W. Wolff, Mackenzie M. Grieman, Helene H. Hoffmann, Jack D. Humby, Christoph Nehrbass-Ahles, Rachael H. Rhodes, Isobel F. Rowell, Frédéric Parrenin, Loïc Schmidely, Hubertus Fischer, Thomas F. Stocker, Marcus Christl, Raimund Muscheler, Amaelle Landais, and Frédéric Prié
Clim. Past, 19, 851–864, https://doi.org/10.5194/cp-19-851-2023, https://doi.org/10.5194/cp-19-851-2023, 2023
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We present an age scale for a new ice core drilled at Skytrain Ice Rise, an ice rise facing the Ronne Ice Shelf in Antarctica. Various measurements in the ice and air phases are used to match the ice core to other Antarctic cores that have already been dated, and a new age scale is constructed. The 651 m ice core includes ice that is confidently dated to 117 000–126 000 years ago, in the last interglacial. Older ice is found deeper down, but there are flow disturbances in the deeper ice.
Clémence Paul, Clément Piel, Joana Sauze, Nicolas Pasquier, Frédéric Prié, Sébastien Devidal, Roxanne Jacob, Arnaud Dapoigny, Olivier Jossoud, Alexandru Milcu, and Amaëlle Landais
Biogeosciences, 20, 1047–1062, https://doi.org/10.5194/bg-20-1047-2023, https://doi.org/10.5194/bg-20-1047-2023, 2023
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To improve the interpretation of the δ18Oatm and Δ17O of O2 in air bubbles in ice cores, we need to better quantify the oxygen fractionation coefficients associated with biological processes. We performed a simplified analogue of the terrestrial biosphere in a closed chamber. We found a respiration fractionation in agreement with the previous estimates at the microorganism scale, and a terrestrial photosynthetic fractionation was found. This has an impact on the estimation of the Dole effect.
Antoine Grisart, Mathieu Casado, Vasileios Gkinis, Bo Vinther, Philippe Naveau, Mathieu Vrac, Thomas Laepple, Bénédicte Minster, Frederic Prié, Barbara Stenni, Elise Fourré, Hans Christian Steen-Larsen, Jean Jouzel, Martin Werner, Katy Pol, Valérie Masson-Delmotte, Maria Hoerhold, Trevor Popp, and Amaelle Landais
Clim. Past, 18, 2289–2301, https://doi.org/10.5194/cp-18-2289-2022, https://doi.org/10.5194/cp-18-2289-2022, 2022
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This paper presents a compilation of high-resolution (11 cm) water isotopic records, including published and new measurements, for the last 800 000 years from the EPICA Dome C ice core, Antarctica. Using this new combined water isotopes (δ18O and δD) dataset, we study the variability and possible influence of diffusion at the multi-decadal to multi-centennial scale. We observe a stronger variability at the onset of the interglacial interval corresponding to a warm period.
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Short summary
Continental atmospheric humidity is a key climate parameter poorly captured by global climate models. Model–data comparison approaches that are applicable beyond the instrumental period are essential to progress on this issue but face a lack of quantitative relative humidity proxies. Here, we calibrate the triple oxygen isotope composition of phytoliths as a new quantitative proxy of continental relative humidity suitable for past climate reconstructions.
Continental atmospheric humidity is a key climate parameter poorly captured by global climate...
