Lacustrine oxygen isotope records from biogenic silica (δ18OBSi) – a global compilation and review
- 1Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Potsdam, Germany (philip.meister@awi.de)
- *A full list of authors appears at the end of the abstract
Isotope records are crucial for proxy-model comparison in paleoclimatology because of their advantage of being directly comparable with isotope-enabled paleoclimate model outputs. Oxygen isotopes (δ18O) are commonly measured on carbonates (i.e. ostracods, authigenic carbonates) and biogenic silica (mainly diatoms). Oxygen isotopes in lacustrine carbonates (δ18OCaCO3) have been studied extensively for several decades, yet they are subject to complex species-dependent fractionation processes and not available globally. Lacustrine oxygen isotope records from biogenic silica (δ18OBSi), on the other hand, likely do not display species-dependent fractionation effects (or only very minor) and offer insight even in data-sparse regions devoid of carbonates, such as the Arctic. To date, more than 70 lacustrine δ18OBSi records have been published. These case studies have been complemented with additional efforts addressing climatic and hydrological backgrounds, laboratory techniques and possible species-dependent fractionation as well as deposition and dissolution effects.
Here, we present the first comprehensive review and global compilation of lacustrine δ18OBSi records, with explicit regard to their individual lake basin parameters. With this work, we aim at contributing to bridging the gap between modelling and isotope geochemistry approaches regarding terrestrial archives in paleoclimatology. Departing from hitherto prevalent case studies, we assess what we can learn from lacustrine δ18OBSi records globally, considering lake basin characteristics, spatial and temporal coverage as well as hydrological background information. This improves both the usability of δ18OBSi for proxy-model comparison and our understanding of the general constraints for interpreting lacustrine δ18OBSi records.
Anne Alexandre (Aix Marseille University, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, France), Hannah Bailey (Ecology and Genetics, University of Oulu, Oulu, Finland), Philip Barker (Lancaster Environment Centre, Lancaster University, Lancaster, United Kingdom), Boris K. Biskaborn (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems, Potsdam, Germany), Ellie Broadman (School of Earth and Sustainability, Northern Arizona University, Flagstaff, Arizona, United States), Rosine Cartier (Lund University, Department of Geology, Lund, Sweden), Bernhard Chapligin (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems, Potsdam, Germany), Martine Couapel (Aix Marseille University, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, France), Jonathan R. Dean (Department of Geography, Geology & Environment, University of Hull, United Kingdom), Bernhard Diekmann (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems, Potsdam, Germany; Institute of Geosiences, Potsdam University, Potsdam, Germany), Poppy Harding (Department of Geography, Royal Holloway, University of London, Egham, UK), Andrew Henderson (School of Geography, Politics and Sociology, Newcastle University, Newcastle upon Tyne, UK), Armand Hernandez (Instituto Dom Luiz (IDL), Faculty of Sciences, University of Lisbon, Lisbon, Portugal), Ulrike Herzschuh (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems, Potsdam, Germany; Institute of Environmental Science and Geography, University of Potsdam, Germany; Institute of Biochemistry and Biology, University of Potsdam, Germany), Svetlana Kostrova (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems, Potsdam, Germany; Vinogradov Institute of Geochemistry, Siberian Branch of Russian Academy of Sciences, Irkutsk, Russia), Jack Lacey (National Environmental Isotope Facility, Isotope Geosciences Facility, British Geological Survey, Keyworth, Nottingham, UK), Melanie J. Leng (National Environmental Isotope Facility, Isotope Geosciences Facility, British Geological Survey, Keyworth, Nottingham, UK; Centre for Environmental Geochemistry, School of Biosciences, University of Nottingham, Loughborough, UK), Andreas Lücke (Forschungszentrum Jülich GmbH, IBG-3: Agrosphere, Jülich, Germany), Anson Mackay (Environmental Change Research Centre, Department of Geography, University College London, London, UK), Eniko Magyari (Department of Environmental and Landscape Geography, MTA-MTM-ELTE Research Group for Paleontology, Eötvös Loránd University, Budapest, Hungary), Biljana Narancic (Laboratoire de Paléoécologie Aquatique, Centre d’Études nordiques & Département de géographie, Université Laval, Canada; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems, Potsdam, Germany), Cécile Porchier (Department of Geography, University College London, London, UK), Gunhild Rosqvist (Department of Physical Geography, Stockholm University, Stockholm, Sweden), Aldo Shemesh (Department of Earth and Planetary Sciences, the Weizmann Institute of Science, Rehovot, Israel), Corinne Sonzogni (Aix Marseille University, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, France), George Swann (School of Geography, University of Nottingham, Nottingham, UK), Florence Sylvestre (Aix Marseille University, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, France), and Hanno Meyer (Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Polar Terrestrial Environmental Systems, Potsdam, Brandenburg, Germany)
How to cite: Meister, P. and the Project team: "Lacustrine oxygen isotope records from biogenic silica (δ18OBSi) – a global compilation and review": Lacustrine oxygen isotope records from biogenic silica (δ18OBSi) – a global compilation and review, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-12748, https://doi.org/10.5194/egusphere-egu21-12748, 2021.
