Multidecadal ocean variability and NW European ice sheet surges during the last deglaciation
Multidecadal ocean variability and NW European ice sheet surges during the last deglaciation
复制标题
末次冰消期期间的数十年海洋变化和欧洲西北部冰盖激增
DOI：
10.1029/2002gc000351
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发表时间：
2002
期刊：
影响因子：
3.7
通讯作者：
N. Shackleton
中科院分区：
文献类型：
--
作者：
P. Knutz;I. Hall;R. Zahn;T. L. Rasmussen;A. Kuijpers;M. Moros;N. Shackleton
来自不列颠群岛大西洋边缘的多代理古海洋学记录以前所未有的细节揭示了冰山和融水的排放，以应对最后一次冰消期海面温度的升高。我们观察到的最早的信号冰川消退作为一个温和的海拔的海面温度，开始与一个弱发展的温跃层和高度通风的中间沃茨在罗卡尔槽的存在。这种变暖的脉冲触发了一系列数十年的冰筏碎片峰值，最终导致了17，500年前的主要融水排放，与整个西北欧洲地区的冰盖解体有关。融水的影响导致了深水通风和海面冷却阶段的逐步减少，在海因里希事件1期间，劳伦泰德冰盖崩溃之前500-1000年。在Bølling-Allerød到新仙女木过渡期间，欧洲大陆边缘的快速海洋冰盖相互作用的类似序列被确定。我们的沉积物核心的战略位置表明，在欧洲西北部的冰盖在温盐热传输的瞬态增加的敏感和快速的反应。
A multiproxy paleoceanographic record from the Atlantic margin off the British Isles reveals in unprecedented detail discharges of icebergs and meltwater in response to sea surface temperature increases across the last deglaciation. We observe the earliest signal of deglaciation as a moderate elevation of sea surface temperatures that commenced with a weakly developed thermocline and the presence of highly ventilated intermediate waters in the Rockall Trough. This warming pulse triggered a series of multidecadal ice‐rafted debris peaks that culminated with a major meltwater discharge at 17,500 years before present related to ice sheet disintegration across the NW European region. The impact of meltwater caused a progressive reduction in deep water ventilation and a sea surface cooling phase that preceded the collapse of the Laurentide Ice Sheet during Heinrich event 1 by 500–1000 years. A similar sequence of rapid ocean‐ice sheet interaction across the European continental margin is identified during the Bølling‐Allerød to Younger Dryas transition. The strategic location of our sediment core suggests a sensitive and rapid response of ice sheets in NW Europe to transient increases in thermohaline heat transport.