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首页> 外文期刊>Paleoceanography >Atlantic Water advection versus sea-ice advances in the eastern Fram Strait during the last 9 ka: Multiproxy evidence for a two-phase Holocene
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Atlantic Water advection versus sea-ice advances in the eastern Fram Strait during the last 9 ka: Multiproxy evidence for a two-phase Holocene

机译：在最后9 ka期间，东部弗拉姆海峡的大西洋水平流与海冰变化：两相全新世的多代理证据

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摘要

A sediment core from the West Spitsbergen continental margin was studied to reconstruct climate and paleoceanographic variability during the last ~9 ka in the eastern Fram Strait (FS). Our multiproxy evidence suggests that the establishment of the modern oceanographic configuration in the eastern FS occurred stepwise, in response to the postglacial sea-level rise and the related onset of modern sea-ice production on the shallow Siberian shelves. The late Early and Mid-Holocene interval (9 to 5 ka) was generally characterized by relatively unstable conditions. High abundance of the subpolar planktic foraminifer species Turborotalita quinqueloba implies strong intensity of Atlantic Water (AW) inflow with high productivity and/or high AW temperatures, resulting in a strong heat flux to the Arctic. A series of short-lived cooling events (8.2, 6.9, and 6.1 ka) occurred superimposed on the warm late Early to Mid-Holocene conditions. Our proxy data imply that simultaneous to the complete postglacial flooding of Arctic shallow shelves and the initiation of modern sea-ice production, strong advance of polar waters initiated modern oceanographic conditions in the eastern FS at ~5.2 ka. The Late Holocene was marked by the dominance of the polar planktic foraminifer species Neogloboquadrina pachyderma, a significant expansion of sea ice/icebergs, and strong stratification of the water column. Although planktic foraminiferal assemblages as well as sea subsurface temperatures suggest a return of slightly strengthened advection of subsurface AW after 3 ka, a relatively stable cold-water layer prevailed at the sea surface, and the study site was probably located within the seasonally fluctuating marginal ice zone during the Neoglacial period. Key Points Stepwise transition of Holocene to modern situationin eastern Fram StraitStrong heat flux 9-5 ka, coolings at 8.2., 6.9, 6.1, and 5.2 kaNeoglacial parallel to flooding of Arctic shelves/modern sea-ice production
机译：研究了西斯匹次卑尔根大陆边缘的沉积物核心，以重建东部弗拉姆海峡（FS）的最后一个〜9 ka期间的气候和古海洋学变异性。我们的多代理证据表明，响应于冰川后海平面上升以及现代西冰洋在西伯利亚大陆架上的相关生产活动，东部FS的现代海洋构造逐步建立。全新世早期和中期中期（9至5 ka）的特征通常是条件相对不稳定。亚极板层有孔虫物种Turborotalita quinqueloba的丰度高，意味着大西洋水（AW）的流入强度高，生产率高和/或温度高，导致向北极的热通量大。一系列短暂的降温事件（8.2、6.9和6.1 ka）叠加在早至中全新世的暖期条件下。我们的代理数据表明，在北极浅层陆架发生完完全的冰期后洪水和现代海冰生产的开始的同时，极地水域的强劲发展在FS东部〜5.2 ka引发了现代海洋学条件。全新世晚期的特征是极性板状有孔虫物种新球藻（Neogloboquadrina pachyderma）的优势，海冰/冰山的显着扩张以及水柱的强烈分层。尽管板状有孔虫的组合以及海面的地下温度表明，在3 ka之后，地下AW的对流略有增强，但相对稳定的冷水层在海面盛行，研究地点可能位于季节性波动的边缘冰中新冰期的地带。要点弗拉姆海峡东部全新世逐步过渡到现代情况强热通量9-5 ka，降温8.2、6.9、6.1和5.2 ka与北极架子/现代海冰生产的洪水平行的冰河

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