Abstract
The coincidence between the termination of major glaciations in the northern and southern hemispheres is not easily explained. The association between. these events and peaks in northern hemisphere seasonality suggests that these rapid warmings are linked to the earth’s orbital cycles. The lack of correlation between terminations and the.seasonality record for the southern hemispheres suggests that the southern hemisphere terminations must have been driven by events in the nothern hemisphere. The global sea level rise associated with the melting of the large northern hemisphere ice sheets does not appear to be the link because the events in the Antarctic Ocean clearly led the O18 change in the sea. Also, it is difficult to see why a sea level rise would trigger deglaciation in the Andes. Albedo change due to the retreat of the northern ice sheets and sea ice not only suffers the timing problem associated with the sea level change but appears to be inadequate on theoretical grounds. GCM models suggest that the radiation budget influence of the albedo changes would be confined to the northern hemisphere..Thus, we are left with either large changes in the pattern of deep sea ventilation or CO2 changes in the atmosphere as the agents of interhemispheric transmittal of the climatic message.
Contribution Number 3576 of Lamont-Doherty Geological Observatory/Columbia University.
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Broecker, W.S. (1984). Terminations. In: Berger, A., Imbrie, J., Hays, J., Kukla, G., Saltzman, B. (eds) Milankovitch and Climate. NATO ASI Series, vol 126. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-4841-4_14
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DOI: https://doi.org/10.1007/978-94-017-4841-4_14
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