MIS 3 to MIS 1 temporal and LGM spatial variability in Arctic Ocean sea ice cover: Reconstruction from biomarkers
MIS 3 to MIS 1 temporal and LGM spatial variability in Arctic Ocean sea ice cover: Reconstruction from biomarkers
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DOI：
10.1002/2015pa002814
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
Xiaotong Xiao;R. Stein;K. Fahl
中科院分区：
文献类型：
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作者：
Xiaotong Xiao;R. Stein;K. Fahl
使用海冰代理IP 25和植物甾醇衍生的生物标志物（油菜甾醇和地甾醇）北极海冰条件重建海洋同位素阶段（MIS）3至1 -特别强调末次冰期最大期（LGM）-从北方巴伦支海大陆边缘横跨北冰洋中部到门捷列夫海岭南部的沉积物岩心。我们的研究结果表明，更广泛的海冰覆盖比今天在MIS 3的后期，增加海冰的增长在MIS 2和减少海冰覆盖在末次冰消期。夏季冰缘仍然在巴伦支海北部，即使在非常寒冷的时期（即，末次冰期最大值（LGM））以及温暖时期（即，Bolling-Allerod）。在末次盛冰期，斯瓦尔巴群岛西部边缘和北方巴伦支海边缘地区的特点是高浓度的IP 25和浮游植物生物标志物，解释为一个生产性的冰缘的情况下，所造成的流入温暖的大西洋水。相比之下，LGM北冰洋中部（84°N以北）全年被厚厚的永久海冰覆盖，很少破裂，生物标志物浓度为零或接近零。春季/夏季海冰边缘显着向南延伸到拉普捷夫海陆架（南部罗蒙诺索夫岭）和南部门捷列夫岭在末次冰期。我们的代理重建是非常一致的基础上发表的模型结果北大西洋/北冰洋海冰模型（NAOSIM）。
Using the sea ice proxy IP25 and phytoplankton-derived biomarkers (brassicasterol and dinosterol) Arctic sea-ice conditions were reconstructed for Marine Isotope Stage (MIS) 3 to 1 - with special emphasis on the Last Glacial Maximum (LGM) - in sediment cores from the northern Barents Sea continental margin across the Central Arctic Ocean to the Southern Mendeleev Ridge. Our results suggest more extensive sea-ice cover than present-day during latter part of MIS 3, increasing sea-ice growth during MIS 2 and decreased sea-ice cover during the last deglacial. The summer ice edge remained north of the Barents Sea even during extremely cold (i.e., Last Glacial Maximum (LGM)) as well as warm periods (i.e., Bolling-Allerod). During the LGM, the western Svalbard margin and the northern Barents Sea margin areas were characterized by high concentrations of both IP25 and phytoplankton biomarkers, interpreted as a productive ice-edge situation, caused by the inflow of warm Atlantic Water. In contrast, the LGM Central Arctic Ocean (north of 84°N) was covered by thick permanent sea ice throughout the year with rare break-up, indicated by zero or near-zero biomarker concentrations. The spring/summer sea-ice margin significantly extended southwards to the Laptev Sea shelf (southern Lomonosov Ridge) and southern Mendeleev Ridge during the LGM. Our proxy reconstructions are very consistent with published model results based on the North Atlantic/Arctic Ocean Sea Ice Model (NAOSIM).