Articles | Volume 75, issue 2
https://doi.org/10.5194/egqsj-75-173-2026
© 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/egqsj-75-173-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Paleoseasonality through serial stable isotope analysis of Pleistocene to recent Etheria elliptica shells from the middle Atbara River, eastern Sudan
Aisha Huseen
CORRESPONDING AUTHOR
Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany
Department of Geology, University of Khartoum, Khartoum, Sudan
Department of Geography and Geosciences, Friedrich Alexander Universität Erlangen-Nürnberg, Erlangen, Germany
Robert Bussert
Institute of Applied Geosciences, Technische Universität Berlin, Berlin, Germany
Mosab Mohammednoor
Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany
Institute of Applied Geosciences, Technische Universität Berlin, Berlin, Germany
Ulrich Struck
Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany
Sumiko Tsukamoto
LIAG Institute for Applied Geophysics, Hannover, Germany
Department of Geosciences, University of Tübingen, Tübingen, Germany
Ali Eisawi
Department of Geology, University of Khartoum, Khartoum, Sudan
Faculty of Petroleum and Minerals, Al Neelain University, Khartoum, Sudan
Faysal Bibi
CORRESPONDING AUTHOR
Museum für Naturkunde, Leibniz Institute for Evolution and Biodiversity Science, Berlin, Germany
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Hydrol. Earth Syst. Sci., 29, 3993–4014, https://doi.org/10.5194/hess-29-3993-2025, https://doi.org/10.5194/hess-29-3993-2025, 2025
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Understanding water balance in lakes is complex. We studied Lake Groβ Glienicke in Germany, using an innovative method that combines isotope measurements and a hydrological model to improve estimates of water inflow and evaporation. Our findings show a high correlation between the two approaches, leading to better predictions of lake water dynamics. This research offers a reliable way of evaluating the model outputs.
Gabrielle Rodrigues de Faria, David Lazarus, Johan Renaudie, Jessica Stammeier, Volkan Özen, and Ulrich Struck
Clim. Past, 20, 1327–1348, https://doi.org/10.5194/cp-20-1327-2024, https://doi.org/10.5194/cp-20-1327-2024, 2024
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Export productivity is part of the global carbon cycle, influencing the climate system via biological pump. About 34 million years ago, the Earth's climate experienced a climate transition from a greenhouse state to an icehouse state with the onset of ice sheets in Antarctica. Our study shows important productivity events in the Southern Ocean preceding this climatic shift. Our findings strongly indicate that the biological pump potentially played an important role in that past climate change.
Richard M. Besen, Kathleen Schindler, Andrew S. Gale, and Ulrich Struck
J. Micropalaeontol., 42, 117–146, https://doi.org/10.5194/jm-42-117-2023, https://doi.org/10.5194/jm-42-117-2023, 2023
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Turonian–Coniacian agglutinated foraminiferal assemblages from calcareous deposits from the temperate European shelf realm were studied. Acmes of agglutinated foraminifera correlate between different sections and can be used for paleoenvironmental analysis expressing inter-regional changes. Agglutinated foraminiferal morphogroups display a gradual shift from Turonian oligotrophic environments towards more mesotrophic conditions in the latest Turonian and Coniacian.
Gerhard Franz, Vladimir Khomenko, Peter Lyckberg, Vsevolod Chournousenko, Ulrich Struck, Ulrich Gernert, and Jörg Nissen
Biogeosciences, 20, 1901–1924, https://doi.org/10.5194/bg-20-1901-2023, https://doi.org/10.5194/bg-20-1901-2023, 2023
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This research describes the occurrence of Precambrian fossils, with exceptionally well preserved morphology in 3D. These microfossils reach a size of millimeters (possibly up to centimeters) and thus indicate the presence of multicellular eukaryotes. Many of them are filamentous, but other types were also found. These fossils lived in a depth of several hundred meters and thus provide good evidence of a continental the deep biosphere, from a time generally considered as the
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Clément Coiffard, Haytham El Atfy, Johan Renaudie, Robert Bussert, and Dieter Uhl
Biogeosciences, 20, 1145–1154, https://doi.org/10.5194/bg-20-1145-2023, https://doi.org/10.5194/bg-20-1145-2023, 2023
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Eighty-million-year-old fossil leaf assemblages suggest a widespread distribution of tropical rainforest in northeastern Africa.
Marcus Richter and Sumiko Tsukamoto
Geochronology, 4, 55–63, https://doi.org/10.5194/gchron-4-55-2022, https://doi.org/10.5194/gchron-4-55-2022, 2022
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When using trapped-charge dating methods to determine the time of deposition of a sediment, it is of great importance to know whether the signal containing the age information has been completely erased before burial or if a residual signal is inherited. We examined the residual doses of the quartz ESR signals of young fluvial sediments from the Lower Rhine terraces with known luminescence ages. We found varying but large residuals, indicating an incomplete bleaching of the quartz ESR signals.
Richard M. Besen, Ulrich Struck, and Ekbert Seibertz
Foss. Rec., 24, 395–441, https://doi.org/10.5194/fr-24-395-2021, https://doi.org/10.5194/fr-24-395-2021, 2021
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The agglutinated foraminiferal fauna in carbonate rocks from the mid-Cretaceous of Lower Saxony is documented and applied to reconstruct former paleoenvironmental conditions. Especially, sea level fluctuations are possible to reconstruct from changes in the foraminiferal record. Differences of the foraminiferal assemblages in different locations, closer or further away from the former coast, are discussed. Described bio-events of the time interval are linked to foraminiferal bio-events.
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Short summary
Oxygen isotopes from Atbara River shells reveal that rainfall seasonality has remained similar to modern patterns for about 200 ka, highlighting persistent seasonality that structured savanna ecosystems. Carbon isotopes were more enriched in the Late Pleistocene for reasons still unclear. Today, the Atbara local meteoric water line matches other Nile basin rivers, reflecting strong evaporation and mixed moisture sources.
Oxygen isotopes from Atbara River shells reveal that rainfall seasonality has remained similar...