Ellison Christopher R W, Chapman Mark R, Hall Ian R
School of Environmental Sciences, University of East Anglia (UEA), Norwich, NR4 7TJ, UK.
Science. 2006 Jun 30;312(5782):1929-32. doi: 10.1126/science.1127213.
Evidence from a North Atlantic deep-sea sediment core reveals that the largest climatic perturbation in our present interglacial, the 8200-year event, is marked by two distinct cooling events in the subpolar North Atlantic at 8490 and 8290 years ago. An associated reduction in deep flow speed provides evidence of a significant change to a major downwelling limb of the Atlantic meridional overturning circulation. The existence of a distinct surface freshening signal during these events strongly suggests that the sequenced surface and deep ocean changes were forced by pulsed meltwater outbursts from a multistep final drainage of the proglacial lakes associated with the decaying Laurentide Ice Sheet margin.
来自北大西洋深海沉积物岩芯的证据表明，在我们当前的间冰期，即8200年事件中，最大的气候扰动表现为8490年前和8290年前北极次极地地区出现的两次明显降温事件。伴随而来的深层水流速度降低，为大西洋经向翻转环流一个主要下沉分支发生重大变化提供了证据。在这些事件期间存在明显的表层淡水信号，这有力地表明，一系列的表层和深层海洋变化是由与劳伦泰德冰盖边缘衰退相关的冰前湖多阶段最终排水过程中脉冲式融水爆发所驱动的。
