The penultimate deglaciation: High-resolution paleoceanographic evidence from a north–south transect along the eastern Nordic Seas
The penultimate deglaciation: High-resolution paleoceanographic evidence from a north–south transect along the eastern Nordic Seas
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倒数第二次冰消作用：来自北欧东部海域南北横断面的高分辨率古海洋学证据
DOI：
10.1016/j.epsl.2005.11.032
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发表时间：
2006
影响因子：
5.3
通讯作者：
Liv Senneset
中科院分区：
文献类型：
--
作者：
B. Risebrobakken;E. Balbon;T. Dokken;E. Jansen;C. Kissel;L. Labeyrie;T. Richter;Liv Senneset
对倒数第二次终止进行了研究，重点是北欧东部的海洋变化以及这些变化对周围冰盖的影响，反之亦然。在研究期间，大西洋子午线翻转环流(AMOC)的强度反复发生重大变化。强烈的倾覆次数和向北的热量输送增加是触发一次轻微和两次重大解体事件的重要因素。两次主要的崩解事件被一个以强烈的AOC为特征的消冰期停顿分开。从南部的法罗-设得兰海峡到北部的弗拉姆海峡，整个北欧东部都出现了同样的变化。在倒数第二次冰川消融期间发生的一些海洋变化可以与最后一次冰川消融过程中看到的变化相媲美。由于目前的日照强迫，冬季水汽通量减少，夏季融化增加，进一步放大了冰盖解体的速度。TII计算的海平面变化平均值为121±4m，前一步为41±16m，后一步为80±13m。
The penultimate termination has been studied with focus on oceanographic changes in the eastern Nordic Seas and the influence of these changes on the surrounding ice sheets and vice versa. Repeatedly, major changes in the strength of the Atlantic Meridional Overturning Circulation (AMOC) occurred during the studied interval. Times of strong overturning and increased heat transport northwards were of importance in triggering one minor and two major disintegration events. The two major disintegration events were separated by a deglacial pause, characterized by a strong AMOC. The same variability is seen throughout the eastern Nordic Seas, from the Faeroe–Shetland Channel in the south to the Fram Strait in the north. Some of the oceanographic changes occurring during the penultimate termination are comparable with changes seen through the last deglaciation. Reduced winter moisture flux and increased summer melting due to the present insolation forcing further amplified the rate of ice sheet disintegration. Calculated sea-level change through TII shows a mean change of 121±4 m, 41±16 m in the first step and 80±13 m in the last step.