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    Time-dependent response of a zonally averaged ocean–atmosphere–sea ice model to Milankovitch forcing

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    AnticoEA_cdyn_10_manus.pdf (874.7Kb)
    Date
    2010-03
    Author
    Antico, Andres  Concept link
    Marchal, Olivier  Concept link
    Mysak, Lawrence A.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/4132
    As published
    https://doi.org/10.1007/s00382-010-0790-6
    Abstract
    An ocean-atmosphere-sea ice model is developed to explore the time-dependent response of climate to Milankovitch forcing for the time interval 5-3 Myr BP. The ocean component is a zonally averaged model of the circulation in five basins (Arctic, Atlantic, Indian, Pacific, and Southern Oceans). The atmospheric component is a one-dimensional (latitudinal) energy balance model, and the sea-ice component is a thermodynamic model. Two numerical experiments are conducted. The first experiment does not include sea ice and the Arctic Ocean; the second experiment does. Results from the two experiments are used to investigate (i) the response of annual mean surface air and ocean temperatures to Milankovitch forcing, and (ii) the role of sea ice in this response. In both experiments, the response of air temperature is dominated by obliquity cycles at most latitudes. On the other hand, the response of ocean temperature varies with latitude and depth. Deep water formed between 45°N-65°N in the Atlantic Ocean mainly responds to precession. In contrast, deep water formed south of 60°S responds to obliquity when sea ice is not included. Sea ice acts as a time-integrator of summer insolation changes such that annual mean sea-ice conditions mainly respond to obliquity. Thus, in the presence of sea ice, air temperature changes over the sea ice are amplified, and temperature changes in deep water of southern origin are suppressed since water below sea ice is kept near the freezing point.
    Description
    Author Posting. © The Author(s), 2010. This is the author's version of the work. It is posted here by permission of Springer-Verlag for personal use, not for redistribution. The definitive version was published in Climate Dynamics 6 (2010): 763-779, doi:10.1007/s00382-010-0790-6.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Preprint: Antico, Andres, Marchal, Olivier, Mysak, Lawrence A., "Time-dependent response of a zonally averaged ocean–atmosphere–sea ice model to Milankovitch forcing", 2010-03, https://doi.org/10.1007/s00382-010-0790-6, https://hdl.handle.net/1912/4132
     
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