Last Interglacial (MIS5e) hydrographic shifts linked to meltwater discharges from the East Greenland margin

Last Interglacial (MIS5e) hydrographic shifts linked to meltwater discharges from the East Greenland margin
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末次间冰期(MIS5e)水文变化与东格陵兰边缘融水排放有关

DOI:
10.1016/j.quascirev.2017.03.026
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发表时间:
2017
期刊:
The EGU General Assembly
影响因子:
--
通讯作者:
Van Nieuwenhove
Van Nieuwenhove
中科院分区:
--
文献类型:
--
作者:
Zhuravleva;Van Nieuwenhove

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在末次间冰期(MIS 5e)和前冰川终止(T2)期间,格陵兰冰盖(GIS)的面积减小,海洋表面的近端证据仍然很难找到。使用一个新的沉积物记录从冰岛西部海,东北GIS的行为和它的关系,亚极地北大西洋表面水文检查。极轻的氧同位素(δ 18 O)值被发现在早期MIS 5e和点增强融水释放,可能从东北部的地理信息系统中东格陵兰岛。从下游的冷东格陵兰电流(EGC)及其向东分支的数据表明,这不仅在北欧海,而且在东南拉布拉多海的融水的深远影响。特别是,而早期MIS 5e变暖(在128.5-126.5万年)在这两个地区正好与相对减少的融水输入到EGC,随后的冷却注意到在126.5万年后,一个新的主要淡水事件离开中东格陵兰岛。我们的数据进一步表明,持续的淡水的影响,从东格陵兰边缘在整个MIS 5e的间隔,此外,还揭示了一个晚MIS 5e融水事件。后一个事件发生在最后一次冰期开始之前,强调了格陵兰融水作为间冰期气候强迫因素的重要性。
Proximal evidence of the surface ocean response to size reduction of the Greenland Ice Sheet (GIS) during the Last Interglacial (MIS5e) and preceding glacial termination (T2) remains largely elusive. Using a new sediment record from the western Iceland Sea, the behavior of the northeastern GIS and its relation to the subpolar North Atlantic surface hydrography is examined. Extremely light oxygen isotopic (δ18O) values are found off central East Greenland during early MIS5e and point to enhanced meltwater release, potentially from the northeastern sector of the GIS. Data from downstream the cold East Greenland Current (EGC) and its eastward branches suggest a far-reaching effect of this meltwater not only in the Nordic Seas but also in the SE Labrador Sea. In particular, whereas an early MIS5e warming (at ∼128.5–126.5 ka) in the two regions coincided with the relative reduction of meltwater input into the EGC, the subsequent cooling noted at ∼126.5 ka followed a renewed major freshwater event off central East Greenland. Our data further indicate persistent freshwater influence from the East Greenland margin over the entire MIS5e interval and, in addition, also reveal a late MIS5e meltwater event. The latter event occurred just prior to the last glacial inception and emphasizes the importance of Greenland meltwater as forcing factor on Interglacial climates.
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