Articles | Volume 22, issue 21
https://doi.org/10.5194/bg-22-6749-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-22-6749-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Deltaic burial of authigenic calcite modulates the carbon balance of hardwater lakes
Benedict V. A. Mittelbach
CORRESPONDING AUTHOR
Department of Earth and Planetary Sciences, ETH Zurich, Zurich, Switzerland
Department of Surface Waters Research and Management, Eawag, Dübendorf, Switzerland
present address: Division of Geological and Planetary Science, California Institute of Technology, Pasadena, CA 91125, USA
Margot E. White
Department of Earth and Planetary Sciences, ETH Zurich, Zurich, Switzerland
Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, Canada
Timo M. Y. Rhyner
Department of Earth and Planetary Sciences, ETH Zurich, Zurich, Switzerland
Negar Haghipour
Department of Earth and Planetary Sciences, ETH Zurich, Zurich, Switzerland
Laboratory for Ion Beam Physics, Department of Physics, ETH Zurich, Zurich, Switzerland
Marie-Elodie Perga
Faculty of Geosciences and Environment, Institute of Earth Surface Dynamics, University of Lausanne, Lausanne, Switzerland
Nathalie Dubois
Department of Earth and Planetary Sciences, ETH Zurich, Zurich, Switzerland
Department of Surface Waters Research and Management, Eawag, Dübendorf, Switzerland
Timothy I. Eglinton
Department of Earth and Planetary Sciences, ETH Zurich, Zurich, Switzerland
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The Gulf of Palermo features several submarine canyons, where 50–70 % of the organic carbon deposited in them is terrigenous (OC-terr). The contribution of OC-terr generally decreases offshore and across canyons. Rivers deliver OC-terr, which is redistributed by regional currents and intercepted by the farthest down-current canyon, while the other submarine canyons receive terrigenous organic carbon from more distal sources. Bottom trawling also contributes to the transfer of OC-terr down-canyon.
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Chantal Schmidt, David Mair, Naki Akçar, Marcus Christl, Negar Haghipour, Christof Vockenhuber, Philip Gautschi, Brian McArdell, and Fritz Schlunegger
EGUsphere, https://doi.org/10.5194/egusphere-2025-3055, https://doi.org/10.5194/egusphere-2025-3055, 2025
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Our study examines erosion in a small, pre-Alpine basin by using cosmogenic nuclides in river sediments. Based on a dense measuring network we were able to distinguish two main zones: an upper zone with slow erosion of surface material, and a steeper, lower zone where faster erosion is driven by landslides. The data suggests that sediment has been constantly produced over thousands of years, indicating a stable, long-term balance between contrasting erosion processes.
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We studied how temperature, pH, and oxygen levels affect bacterial lipids (brGDGTs) in lake water and sediment samples from Rotsee, a shallow freshwater lake. These lipids are used to reconstruct past climate conditions. Our findings show that stratification impacts brGDGT distribution in the lake surface, while chemistry influences distribution at the bottom, complicating their use as temperature indicators. This research provides new insights to improve climate reconstructions in lakes.
Thibault Lambert, Pascal Perolo, Nicolas Escoffier, and Marie-Elodie Perga
Biogeosciences, 19, 187–200, https://doi.org/10.5194/bg-19-187-2022, https://doi.org/10.5194/bg-19-187-2022, 2022
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The bacterial mineralization of dissolved organic matter (DOM) in inland waters contributes to CO2 emissions to the atmosphere. Human activities affect DOM sources. However, the implications on DOM mineralization are poorly known. Combining sampling and incubations, we showed that higher bacterial respiration in agro-urban streams related to a labile pool from aquatic origin. Therefore, human activities may have a limited impact on the net carbon exchanges between inland waters and atmosphere.
Pascal Perolo, Bieito Fernández Castro, Nicolas Escoffier, Thibault Lambert, Damien Bouffard, and Marie-Elodie Perga
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Annika Fiskal, Eva Anthamatten, Longhui Deng, Xingguo Han, Lorenzo Lagostina, Anja Michel, Rong Zhu, Nathalie Dubois, Carsten J. Schubert, Stefano M. Bernasconi, and Mark A. Lever
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Microbially produced methane can serve as a carbon source for freshwater macrofauna most likely through grazing on methane-oxidizing bacteria. This study investigates the contributions of different carbon sources to macrofaunal biomass. Our data suggest that the average contribution of methane-derived carbon is similar between different fauna but overall remains low. This is further supported by the low abundance of methane-cycling microorganisms.
Harriet L. Wilson, Ana I. Ayala, Ian D. Jones, Alec Rolston, Don Pierson, Elvira de Eyto, Hans-Peter Grossart, Marie-Elodie Perga, R. Iestyn Woolway, and Eleanor Jennings
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Lakes are often described in terms of vertical layers. The
epilimnionrefers to the warm surface layer that is homogeneous due to mixing. The depth of the epilimnion can influence air–water exchanges and the vertical distribution of biological variables. We compared various methods for defining the epilimnion layer and found large variability between methods. Certain methods may be better suited for applications such as multi-lake comparison and assessing the impact of climate change.
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Short summary
Lakes can emit carbon dioxide but also store carbon in their sediments. In hardwater lakes like Lake Geneva, calcite precipitates in the water column, releasing CO2 to the atmosphere, but upon sinking these particles also transport carbon to the sediment. Using sediment traps and radiocarbon isotopes, we show that much of the precipitated calcite is buried, highlighting an overlooked carbon sink that partly offsets the CO2 outgassing and should be included in lake carbon budgets.
Lakes can emit carbon dioxide but also store carbon in their sediments. In hardwater lakes like...
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