Late warming and early cooling of the sea surface in the Nordic seas during MIS 5e (Eemian Interglacial)
Late warming and early cooling of the sea surface in the Nordic seas during MIS 5e (Eemian Interglacial)
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MIS 5e（埃米安间冰期）期间北欧海面的晚期变暖和早期冷却
DOI：
10.1016/s0277-3791(02)00254-8
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发表时间：
2003
影响因子：
4
通讯作者：
S. Wastegård
中科院分区：
文献类型：
--
作者：
T. L. Rasmussen;E. Thomsen;A. Kuijpers;S. Wastegård
对分别在大西洋东北部和挪威海东南部的两个岩心中发现的火山灰层进行地球化学鉴定，其年代可追溯到距今 127 ka BP，这使我们能够在海洋同位素阶段 (MIS) 6/5 跃迁时获得跨冰岛-苏格兰海岭的精确关联。两个核心之间的直线距离仅约200公里。在冰岛-苏格兰海岭以南，MIS 5e 爆发时，海面温度在 130 ka BP 时突然上升，比海岭以北至少早 2-3000 年。海脊以南的最高海面温度出现在 MIS 5e 的初始阶段，当时北欧海域的温度仍然较低。海脊以北，海面在 127 ka BP 时迅速变暖。北大西洋记录与西北欧埃米安纪之间的相关性初步表明，MIS 5e 的初始阶段与以温暖的大陆性气候为特征的埃米安早期相关。北欧海洋变暖之后的时期对应于欧洲稍冷且更具海洋性的中埃米亚区间。 MIS 5e 后期，海脊以北海面温度逐渐下降，MIS 5d-5a 期间海面温度较低。山脊以南气温仍然相对较高。数据显示，在 MIS 6 后期，挪威海没有深水外流。在 MIS 6/5 过渡期间，与海脊以南海面变暖同时开始外流。
Geochemical identification of a tephra layer found in two cores from the NE Atlantic Ocean and the SE Norwegian Sea, respectively, and dated to 127 ka BP has enabled us to obtain a precise correlation across the Iceland–Scotland Ridge at the Marine Isotope Stage (MIS) 6/5 transition. The direct distance between the two cores is only about 200 km . South of the Iceland–Scotland Ridge, sea surface temperatures rose abruptly at 130 ka BP at the onset of MIS 5e and at least 2–3000 years earlier than north of the ridge. Maximum sea surface temperatures south of the ridge occurred during this initial phase of MIS 5e, when temperatures in the Nordic Seas were still low. North of the ridge, the sea surface warmed rapidly at 127 ka BP. Correlations between the North Atlantic records and the Eemian of Northwest Europe tentatively indicate that the initial phase of MIS 5e correlates with the early part of the Eemian characterised by a warm, continental type of climate. The period after the warming of the Nordic seas corresponds to the slightly cooler and more oceanic middle Eemian interval in Europe. The sea surface temperatures fell gradually north of the ridge during the later part of MIS 5e and they were low during MIS 5d–5a. South of the ridge the temperatures remained relatively high. The data shows that there was no outflow of deep water from the Norwegian Sea during the later part of MIS 6. Outflow began at the MIS 6/5 transition simultaneous with the sea surface warming south of the ridge.