2–7 Oct 2022
Crans-Montana
Europe/Zurich timezone

Assessing changes in the carbon cycle during Dansgaard-Oeschger events from cosmogenic radionuclides

7 Oct 2022, 11:00
20m
Centre de Congrès Le Régent (Crans-Montana)

Centre de Congrès Le Régent

Crans-Montana

Route des Mélèzes 28 3963 Crans-Montana
Oral presentation Biogeochemical Cycles in the Earth system – data and models

Speaker

Florian Adolphi (Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany)

Description

The last glacial cycle was characterized by strong millennial-scale climate variability. Rapid transitions between cold stadial and warm interstadial conditions (known as Dansgaard-Oeschger Events) had widespread effects on the Earth system. Changes in the carbon cycle accompanied these climate swings, but the underlying processes remain unresolved. Radiocarbon (14C) provides a tool to assess some of the proposed mechanisms. Combining measured atmospheric 14C with independent 14C-production rate estimates (e.g., from 10Be or geomagnetic field records) produces a residual signal that informs about past carbon cycle changes.
We will present new data from New Zealand subfossil kauri-trees that provide a high-precision, high-resolution and truly atmospheric 14C-record for large parts of MIS-3. In combination with ice core 10Be and geomagnetic field data, we investigate the imprint of Dansgaard-Oeschger events on the carbon cycle and discuss potential mechanisms using carbon-cycle modelling.

Primary authors

Florian Adolphi (Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany) Andrew M Lorrey (2National Institute of Water and Atmospheric Research, Auckland, New Zealand) Alan Hogg (Radiocarbon Dating Laboratory, University of Waikato, Hamilton, New Zealand) Peter Köhler (Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany) Timothy J Heaton (School of Mathematics and Statistics, University of Sheffield, Sheffield, UK) Johnathan Palmer (Chronos 14Carbon-Cycle Facility, and Earth and Sustainability Science Research Centre, University of New South Wales, Sydney, Australia) Chris Turney (University of Technology Sydney, Sydney, Australia) Raimund Muscheler (Department of Geology, Lund University, Lund, Sweden)

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