University of Cambridge > Talks.cam > Department of Earth Sciences Seminars (downtown) > Fingerprints of past carbon cycle-climate changes in the Bern3D model

Fingerprints of past carbon cycle-climate changes in the Bern3D model

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Proxy information from ice cores, marine sediment, and other archives demonstrate a fascinating spatio-temporal evolution of the coupled climate and biogeochemical system on orbital-to-decadal time scale. However, we are still far from a complete understanding of the drivers, mechanisms and feedbacks governing past changes in the Earth System. In the presentation, results from transient simulations over glacial-interglacial periods with the Bern3D climate-carbon cycle model will be discussed. A focus is on mechanisms governing past variations in atmospheric CO2 and the associated spatial and temporal imprints on carbon isotopes, deep ocean carbonate ion concentrations, and the export of biogenic particles. Results are compared to proxies from marine and ice archives. Another focus is how the distribution of neodymium isotopes in the ocean can be applied to constrain past ocean circulation and water mass distribution.

Selected publications (pdfs at http://www.climate.unibe.ch/~joos/publications.html)

Glacial-interglacial CO2 /carbonate/13C/14C

Menviel, L., F. Joos, “Towards explaining the Holocene carbon dioxide and carbon isotope records: Results from transient ocean carbon cycle-climate simulations”, Paleoceanography, 24/PA1207, 2012

Menviel, L., F. Joos, S. P. Ritz, “Atmospheric CO2 , C13 and the marine carbon cycle during the last glacial-interglacial cycle: results from transient simulations with the Bern3D model”, Quaternary Science Reviews, submitted, 2012

Roth, R., F. Joos, “Model limits on the role of volcanic carbon emissions in regulating glacial-interglacial CO2 variations”, Earth and Planetary Science Letters, 329-330, 141-149,2012

Tschumi, T., F. Joos, M. Gehlen, C. Heinze, “Deep ocean ventilation, carbon isotopes, marine sedimentation and the deglacial CO2 rise”, Climate of the Past, 7, 771-800,2011

Neodymium isotopes

Rempfer, J., T. F. Stocker, F. Joos, J.-C. Dutay, “On the relationship between Nd isotopic composition and ocean overturning circulation in idealised freshwater discharge events”, Paleoceanography, submitted, 2012

Rempfer, J., T. F. Stocker, F. Joos, J.-C. Dutay, “Sensitivity of Nd isotopic composition in seawater to changes in Nd sources and paleoceanographic implications ”, Journal of Geophysical Research, submitted, 2012

Rempfer, J., T. F. Stocker, F. Joos, J.-C. Dutay, M. Siddall, “Modelling Nd-isotopes with a coarse resolution ocean circulation model: Sensitivities to model parameters and source/sink distributions”, Geochimica et Cosmochimica Acta, 75, 5927-5950, 2011

This talk is part of the Department of Earth Sciences Seminars (downtown) series.

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