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Sensitivity of a two-layer model atmosphere to changes in ice-sheet topography

  • Charles S. Jackson (a1)

Abstract

Results are presented testing the sensitivity of a two-layer model to changes in the Laurentide ice sheet’s geometry following the collapse of the Hudson Bay ice dome. Since the ice sheet is thought to induce cooling over the North Atlantic through its mechanical effect on atmospheric circulation, the model shows a surprising result in that the removal of the Hudson Bay ice dome led to a further cooling of 4°C over the North Atlantic. This finding suggests that fluctuations in ice-sheet topography could have contributed to the climate variability witnessed in the geologic record. Further study is needed to understand the mechanism behind these results.

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Copyright

References

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Alley, R.B. and MacAycal, D.R. 1994. Ice-rafted debris associated with binge/purge oscillations of the Laurentide ice sheet. Paleoceanography, 9(4), 503511.
MacAyeal, D.R. 1993a. Binge/purge osillations of the Laurentide ice sheet as a cause of the North Atlantic’s Heinrich events. Paleoceanography, 8(6), 775784.
MacAyeal, D.R. 1993b. A low-order model of the Heinrich event cycle. Paleoceanography, 8(6),767–773.
Peltier, W.R. 1994. Ice age paleotopography. Science, 265(5169), 195201.
Saravanan, R. 1993. Equational superrotation and maintenance of the general circulation in two-levels models. J. Atmos. Sci., 50(9), 12111227.

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