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  • 1.
    Hutchinson, David K.
    et al.
    Department of Geological Sciences and Bolin Centre for Climate Research, Stockholm University.
    Coxall, Helen K.
    Department of Geological Sciences and Bolin Centre for Climate Research, Stockholm University.
    Lunt, Daniel J.
    School of Geographical Sciences, University of Bristol.
    Steinthorsdottir, Margret
    Swedish Museum of Natural History, Department of Paleobiology. Bolin Centre for Climate Research, Stockholm University.
    de Boer, Agatha M.
    Department of Geological Sciences and Bolin Centre for Climate Research, Stockholm University.
    Baatsen, Michiel
    Institute for Marine and Atmospheric Research, Department of Physics, Utrecht University.
    von der Heydt, Anna
    Institute for Marine and Atmospheric Research, Department of Physics, Utrecht University.
    Huber, Matthew
    Department of Earth, Atmospheric, and Planetary Sciences, Purdue University.
    Kennedy-Asser, Alan T.
    School of Geographical Sciences, University of Bristol.
    Kunzmann, Lutz
    Senckenberg Natural History Collections Dresden.
    Ladant, Jean-Baptiste
    Department of Earth and Environmental Sciences, University of Michigan.
    Lear, Caroline H.
    School of Earth and Ocean Sciences, Cardiff University.
    Moraweck, Karolin
    Senckenberg Natural History Collections Dresden.
    Pearson, Paul N.
    School of Earth and Ocean Sciences, Cardiff University.
    Piga, Emanuela
    School of Earth and Ocean Sciences, Cardiff University.
    Pound, Matthew J.
    Department of Geography and Environmental Sciences, Northumbria University.
    Salzmann, Ulrich
    Department of Geography and Environmental Sciences, Northumbria University.
    Scher, Howie D.
    School of the Earth, Ocean and Environment, University of South Carolina.
    Sijp, Willem P.
    Climate Change Research Centre, University of New South Wales.
    Śliwińska, Kasia K.
    Department of Stratigraphy, Geological Survey of Denmark and Greenland.
    Wilson, Paul A.
    University of Southampton, National Oceanography Centre Southampton.
    Zhang, Zhongshi
    Department of Atmospheric Science, China University of Geoscience, Wuhan.
    The Eocene-Oligocene transition: a review of marine and terrestrial proxy data, models and model-data comparisons2021In: Climate of the Past, ISSN 1814-9324, E-ISSN 1814-9332, Vol. 17, no 1, p. 269-315Article in journal (Refereed)
    Abstract [en]

    The Eocene–Oligocene transition (EOT) was a climate shift from a largely ice-free greenhouse world to an icehouse climate, involving the first major glaciation of Antarctica and global cooling occurring ∼ 34 million years ago (Ma) and lasting ∼ 790 kyr. The change is marked by a global shift in deep-sea δ18O representing a combination of deep-ocean cooling and growth in land ice volume. At the same time, multiple independent proxies for ocean tempera- ture indicate sea surface cooling, and major changes in global fauna and flora record a shift toward more cold-climate- adapted species. The two principal suggested explanations of this transition are a decline in atmospheric CO2 and changes to ocean gateways, while orbital forcing likely influenced the precise timing of the glaciation. Here we review and synthesise proxy evidence of palaeogeography, temperature, ice sheets, ocean circulation and CO2 change from the marine and terrestrial realms. Furthermore, we quantitatively com- pare proxy records of change to an ensemble of climate model simulations of temperature change across the EOT. The simulations compare three forcing mechanisms across the EOT: CO2 decrease, palaeogeographic changes and ice sheet growth. Our model ensemble results demonstrate the need for a global cooling mechanism beyond the imposition of an ice sheet or palaeogeographic changes. We find that CO2 forcing involving a large decrease in CO2 of ca. 40 % (∼ 325 ppm drop) provides the best fit to the available proxy evidence, with ice sheet and palaeogeographic changes play- ing a secondary role. While this large decrease is consistent with some CO2 proxy records (the extreme endmember of decrease), the positive feedback mechanisms on ice growth are so strong that a modest CO2 decrease beyond a critical threshold for ice sheet initiation is well capable of triggering rapid ice sheet growth. Thus, the amplitude of CO2 decrease signalled by our data–model comparison should be consid- ered an upper estimate and perhaps artificially large, not least because the current generation of climate models do not in- clude dynamic ice sheets and in some cases may be under- sensitive to CO2 forcing. The model ensemble also cannot exclude the possibility that palaeogeographic changes could have triggered a reduction in CO2.

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  • 2.
    Thornton, Brett
    et al.
    Department of Environmental Sciences and Analytical Chemistry, Stockholm University.
    Horst, Axel
    Department of Environmental Sciences and Analytical Chemistry, Stockholm University.
    Carrizo, Daniel
    Department of Environmental Sciences and Analytical Chemistry, Stockholm University.
    Holmstrand, Henry
    Department of Environmental Sciences and Analytical Chemistry, Stockholm University.
    Andersson, Per
    Swedish Museum of Natural History, Department of Geology.
    Crill, Patrick
    Department of Geological Sciences, Stockholm University.
    Gustafsson, Örjan
    Department of Environmental Sciences and Analytical Chemistry, Stockholm University.
    A High-Volume Cryosampler and Sample Purification System for Bromine Isotope Studies of Methyl Bromide2013In: Journal of Atmospheric and Oceanic Technology, ISSN 0739-0572, E-ISSN 1520-0426, ISSN 0739-0572, Vol. 30, no 9, p. 2095-2107Article in journal (Refereed)
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  • 3.
    Winton, V.H.L.
    et al.
    Curtin University Perth Australia.
    Edwards, R.
    Curtin University Perth Australia.
    Delmonte, B.
    University of Milano-Bicocca, Milan, Italy.
    Ellis, A
    Curtin University, Perth, Australia.
    Andersson, Per
    Swedish Museum of Natural History, Department of Geology.
    Bowie, A
    University of Tasmania, Hobart, Australia.
    Bertler, N.A.N.
    University of Wellington, Wellington, New Zealand.
    Neff, P.
    University of Rochester, Rochester, New York.
    Tuohy, A.
    University of Wellington, Wellington, New Zealand.
    Multiple sources of soluble atmospheric iron to Antarctic waters2016In: Global Biogeochemical Cycles, ISSN 0886-6236, E-ISSN 1944-9224Article in journal (Refereed)
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1 - 3 of 3
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