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    Strong hemispheric coupling of glacial climate through continental freshwater discharge and ocean circulation (2004)
    Nature Publishing Group
    In:  Nature, 430 . pp. 851-856.
    Details
    Publication Date: 2017-03-07
    Description: The climate of the last glacial period was extremely variable, characterized by abrupt warming events in the Northern Hemisphere, accompanied by slower temperature changes in Antarctica and variations of global sea level. It is generally accepted that this millennial-scale climate variability was caused by abrupt changes in the ocean thermohaline circulation. Here we use a coupled ocean–atmosphere–sea ice model to show that freshwater discharge into the North Atlantic Ocean, in addition to a reduction of the thermohaline circulation, has a direct effect on Southern Ocean temperature. The related anomalous oceanic southward heat transport arises from a zonal density gradient in the subtropical North Atlantic caused by a fast wave-adjustment process. We present an extended and quantitative bipolar seesaw concept that explains the timing and amplitude of Greenland and Antarctic temperature changes, the slow changes in Antarctic temperature and its similarity to sea level, as well as a possible time lag of sea level with respect to Antarctic temperature during Marine Isotope Stage 3.
    Type: Article , PeerReviewed
    Format: text
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  • 2
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    Physical Climate Processes and Feedbacks (2001)
    Cambridge University Press
    In:  In: Climate Change 2001: The Scientific Basis. Contribution of Working Group I to the Third Assessment Report of the Intergovernemental Panel on Climate Change. , ed. by Houghton, J. T., Ding, Y. and Griggs, D. J. Cambridge University Press, Cambridge, United Kingdom, pp. 417-470. ISBN 0521-01495-6
    Details
    Publication Date: 2020-03-30
    Type: Book chapter , NonPeerReviewed
    Format: text
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  • 3
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    231Pa/230Th fractionation by ocean transport, biogenic particle flux and particle type (2005)
    Elsevier
    In:  Earth and Planetary Science Letters, 237 . pp. 135-155.
    Details
    Publication Date: 2016-12-21
    Description: 231Pa and 230Th are removed from the water column by a process of reversible scavenging which quickly removes 230Th to the sediment. 231Pa is less efficiently scavenged onto particles than 230Th and is therefore more effectively transported via advection and diffusion before it reaches the ocean sediment. This study combines particle fields (dust, opal, CaCO3, POC) derived from observations with the Bern3D intermediate complexity ocean model and an equilibrium-scavenging model for isotopes. The equilibrium partition coefficient for particulate versus dissolved isotope activity is varied with particle type. The model can explain many of the features of the global 231Pa and 230Th distribution. The success of such a simple model at representing the global pattern of 231Pa / 230Th activity ratio supports the use of this proxy in paleoceanographic studies. We use the model to address the controversy concerning which particle types are dominant in fractionating 231Pa / 230Th in the ocean. The lithogenic (dust) flux is found to be unimportant for 231Pa / 230Th fractionation— the ocean fractionation of 231Pa / 230Th is dominated by the distribution of the CaCO3 and opal flux. We also confirm that opal is a weak scavenger of 230Th.
    Type: Article , PeerReviewed
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