A LOW-ORDER MODEL OF THE HEINRICH EVENT CYCLE

被引：116

作者：

MACAYEAL, DR

机构：

来源：

PALEOCEANOGRAPHY | 1993年 / 8卷 / 06期

关键词：

D O I：

10.1029/93PA02201

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

If Heinrich events result from free oscillations in the size and basal melting conditions of the Laurentide ice sheet, a rigorous quantitative analysis of ice sheet physics should describe their dynamics. To explore this possibility, I exploit two characteristic timescales which arise from ice sheet physics to construct a relaxation oscillator model of the North Atlantic's Heinrich events. The numerical implementation of this model confirms the notion that the periodicity of Heinrich events (approximately 7,000 years) is determined by the gross properties of a steady glacial climate (e.g., an annual average sea level temperature of -10 degrees C and an adiabatic lapse rate).

引用

页码：767 / 773

页数：7

共 8 条

[1]

Bond G., Heinrich H., Huon S., Broecker W., Labeyrie L., Andrews J., McManus J., Clasen S., Tedesco K., Jantschik R., Simet C., Klas M., Evidence for massive discharges of icebergs into the glacial Northern Atlantic, Nature, 360, pp. 245-250, (1992)

[2]

Carslaw H.S., Jeager J.C., Conduction of Heat in Solids, pp. 353-386, (1988)

[3]

Grousset F.E., Labeyrie L., Sinko J.A., Cremer M., Bond G., Duprat J., Cortijo E., Huon S., Patterns of icerafted detritus in the glacial North Atlantic (40°‐55° N), Paleoceanography, 8, pp. 175-192, (1993)

[4]

Hodell D.A., Late Pleistocene paleoceanography of the South Atlantic sector of the southern ocean: Ocean Drilling Program hole 704A, Paleoceanography, 8, pp. 47-67, (1993)

[5]

MacAyeal D.R., Large‐scale ice flow over a viscous basal sediment: Theory and application to ice stream B, Antarctica, J. of Geophys. Res., 94, pp. 4071-4087, (1989)

[6]

MacAyeal D.R., Irregular oscillations of the West Antarctic ice sheet, Nature, 359, pp. 29-32, (1992)

[7]

MacAyeal D.R., Binge/purge oscillations of the Laurentide ice sheet as a cause of the North Atlantic's Heinrich events, Paleoceanography

[8]

MacAyeal D.R., Wang H.-L., A glaciological throttle on fresh water input to the North Atlantic Ocean during glacial climates, Eos Trans. AGU, 73, 43 Fall, (1992)

← 1 →