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Showing 1–12 of 12 results
Advanced filters: Author: Klaus Wallmann Clear advanced filters

  • An internal redox see-saw between the Panthalassa Basin and the proto-North Atlantic can explain cyclic changes in the sediment record throughout the Cretaceous Thermal Maximum 97 to 91 million years ago, according to simulations with a numerical ocean model.

    • Klaus Wallmann
    • Sascha Flögel
    • Wolfgang Kuhnt
    Research
    Nature Geoscience
    Volume: 12, P: 456-461

  • The relationship between carbon dioxide and climate over millions of years has been a source of controversy. Fossilized liverwort leaves can help illuminate both temperature and atmospheric carbon dioxide levels from 200 to 60 million years ago.

    • Klaus Wallmann
    News & Views
    Nature Geoscience
    Volume: 1, P: 14-15

  • The Si cycle is important to ocean productivity and nutrient cycling, however there are uncertainties in global budgets. Here the authors use a multi-isotope approach on seafloor sediments and pore fluids, finding that an unappreciated source of Si to the ocean is the degradation of seafloor serpentinites.

    • Sonja Geilert
    • Patricia Grasse
    • Catriona D. Menzies
    ResearchOpen Access
    Nature Communications
    Volume: 11, P: 1-11

  • Erosion of glacial till and carbonate dissolution results in a significant net release of alkalinity to coastal waters, according to analysis of till and sediment samples from the Baltic Sea combined with global coastal lithology mapping.

    • Florian Scholz
    • Janine Börker
    • Klaus Wallmann
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 6, P: 1-9

  • Methane seepage from continental slopes has been attributed to gas hydrate dissociation induced by anthropogenic bottom water warming. Here, the authors show that hydrates dissociated before the Anthropocene when the isostatic rebound induced by deglaciation of the Arctic ice sheet outpaced eustatic sea-level rise.

    • Klaus Wallmann
    • M. Riedel
    • G. Bohrmann
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-9

  • Understanding controls on past nitrogen budgets can improve predictions for future global biogeochemical cycling. Here, using foraminiferal pore density and δ13C, the authors present a quantitative record of deglacial nitrate from the intermediate Pacific and infer close coupling between carbon and nitrogen cycles.

    • Nicolaas Glock
    • Zeynep Erdem
    • Anton Eisenhauer
    ResearchOpen Access
    Nature Communications
    Volume: 9, P: 1-10

  • Sediment resuspension doubles oxic particulate organic carbon remineralisation compared with anoxic conditions, while concurrent pyrite oxidation reduces uptake of atmospheric carbon dioxide, according to experimental data from Kiel Bight, Germany.

    • Habeeb Thanveer Kalapurakkal
    • Andrew W. Dale
    • Klaus Wallmann
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 6, P: 1-14

  • Calcite has a higher carbon dioxide uptake efficiency and lower cost than dunite, and it is a preferable material for enhanced benthic weathering as a carbon dioxide removal method, according to an analysis that combines laboratory incubation, benthocosm experiment, and numerical box model.

    • Michael Fuhr
    • Andrew W. Dale
    • Sonja Geilert
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 6, P: 1-11

  • Carbon dioxide can be removed from the atmosphere at an uptake rate of 3.2 megatonnes of carbon dioxide per year by continually adding calcite to mud-bearing sediments in the Baltic Sea, according to an empirical model analysis.

    • Andrew W. Dale
    • Sonja Geilert
    • Klaus Wallmann
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 5, P: 1-11