Atlantic Water advection versus sea-ice advances in the eastern Fram Strait during the last 9 ka - multiproxy evidence for a two-phase Holocene
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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过去 9 ka 期间弗拉姆海峡东部大西洋水平流与海冰前进的关系 - 两阶段全新世的多代理证据
DOI：
10.1002/palo.20028
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
E. Kandiano
中科院分区：
文献类型：
--
作者：
K. Werner;R. Spielhagen;D. Bauch;H. Hass;E. Kandiano
对西斯匹茨卑尔根大陆边缘的一个沉积岩芯进行了研究，以重建弗拉姆海峡东部最后9 ka期间的气候和古海洋学变化。我们的多重代理证据表明，随着冰期后海平面的上升和西伯利亚浅海陆架上现代海冰产生的相关开始，弗拉姆海峡东部现代海洋格局的建立是分阶段进行的。全新世晚期、早、中期(9~5 ka)一般具有相对不稳定的条件。亚极地浮游有孔虫物种Turborotalita ququieloba的高丰度意味着高生产力和/或高AW温度的强大大西洋水(AW)流入，导致向北极的强大热通量。一系列短暂的冷却事件(8.2、6.9。和6.1 ka)，叠加在温暖的晚期、早、中全新世条件下。我们的代理数据表明，在北极浅海陆架冰后完全泛滥和现代海冰生产开始的同时，极地水域的强劲推进在~5.2 ka处启动了东部框架海峡的现代海洋条件。晚全新世的特点是极地浮游有孔虫物种Neogloboquarina pachyderma占优势，海冰/冰山显著扩张，水柱层化强烈。尽管浮游有孔虫组合以及海面和次表层温度表明，在3 ka之后，次表层大西洋水的平流略有增强，但海面上存在相对稳定的冷水层，研究地点可能位于新冰期季节性波动的边缘冰带内。
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. Our multiproxy evidence suggests that the establishment of the modern oceanographic configuration in the eastern Fram Strait 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 and 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 Fram Strait 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 surface and subsurface temperatures suggest a return of slightly strengthened advection of subsurface Atlantic Water 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.
DOI：
10.1016/j.palaeo.2011.05.030
发表时间：
2011-08
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
K. Werner;R. Spielhagen;D. Bauch;H. Hass;E. Kandiano;Katarzyna Zamelczyk
通讯作者：
K. Werner;R. Spielhagen;D. Bauch;H. Hass;E. Kandiano;Katarzyna Zamelczyk
影响因子：
2.4
作者：
Andrews, J. T.;Belt, S. T.;Vare, L. L.
通讯作者：
Vare, L. L.