Abstract
Over the last two decades, studies of deep-ocean sediment records have clearly demonstrated changes in the global climate on Milankovitch time-scales (see Imbrie, this volume). Research over the last few years shows that the climate system also changes at much higher frequencies. Examples of rapid climate changes include the Younger Dryas cold period of NW Europe (Mangerud, 1987; Rind, et al., 1986; Wright, 1989), the “Dansgaard-Oeschger” oscillations in the Greenland ice cores (Broecker, et al., 1988; Dansgaard, et al., 1989; Johnsen, et al., 1992), and the“Heinrich” layers in North Atlantic sediment cores (Heinrich, 1988; Broecker, et al., 1992; Andrews and Tedesco, in the press). The latter two types of changes have durations of circa 1 ± ka with recurrence intervals of a few thousand years. All of these phenomena have been associated with the sensitivity of the thermohaline circulation to influx of fresh water and ice (Broecker and Denton, 1989; Broecker, et al., 1989; Stocker and Wright, 1991).
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Andrews, J.T., Tedesco, K., Jennings, A.E. (1993). Heinrich Events: Chronology and Processes, East-Central Laurentide Ice Sheet and NW Labrador Sea. In: Peltier, W.R. (eds) Ice in the Climate System. NATO ASI Series, vol 12. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-85016-5_11
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