Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet
Subglacial sediment pathways and deglacial chronology of the northern Barents Sea Ice Sheet
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巴伦支海冰盖北部的冰下沉积物路径和冰消年代学
作者：
K. Hogan;J. Dowdeswell;C. Hillenbrand;W. Ehrmann;R. Noormets;L. Wacker
提供了关于巴伦支海北部冰盖(BSIS)在最后一次冰川和消融(21-11.5ka)期间的形态的新信息。我们讨论的BSIS的冰川动力学是基于冰下耕层的粘土矿物组成和巴伦支海中部一个独特的高岭石来源，以前的工作人员在那里为最后一次冰期BSIS放置了一个巨大的、单一的冰穹。我们的结果似乎表明，冰下沉积物来自当地，这表明BSIS至少暂时由多个穹顶组成，可能比之前认为的更具活力。新的放射性碳测年与16.5-15、14、13.5和11.5ka的新冰盖重建一起给出。我们的重建为以前在斯瓦尔巴群岛以东地区和大陆范围内的努力增添了信息。巴伦支海北部的冰川消退进展如下。(I)19-16.5ka。大规模的崩解导致了陆架海槽的动态变薄，并伴随着由于冰的减少而导致的内陆冰盖的显着变薄。(Ii)16.5-15ka。通过升空和冰山崩解，在HinlOpen海槽和Kvitøya海槽发生了75-100公里的冰缘快速退缩，在更东边的Franz Victoria海槽(FVT)发生了重大退缩(>；300公里)。(Iii)15-13.5ka。从FVT向西向斯瓦尔巴群岛撤退，斯瓦尔巴群岛以东的海槽(Kvitøya，Olga和Erik Eriksen)大部分没有结冰，下降了13.5ka。(Iv)13.5-11.5ka。冰层逐渐向斯瓦尔巴特群岛、孔卡尔斯岛和可能还有斯托班肯群岛上的残余冰块撤退。我们的数据需要修正BSIS早先的观点，因为它们指向一个更具活力的冰盖和衰变，一旦在陆架断裂时开始，主导的是从向西向斯瓦尔巴群岛进发的FVT的冰的退出。
New information is presented on the configuration of the northern Barents Sea Ice Sheet (BSIS) during the last glacial and deglaciation (21–11.5 ka). The glacial dynamics of the BSIS that we discuss are based on clay‐mineral compositions of subglacial tills and a distinct kaolinite source in the central Barents Sea where previous workers have placed a large, single ice dome for the last glacial BSIS. Our results, which appear to show that subglacial sediments were sourced locally, suggest that the BSIS consisted at least temporarily of multiple domes and may have been more dynamic than previously thought. New radiocarbon dates are presented along with new ice‐extent reconstructions for 16.5–15, 14, 13.5 and 11.5 ka. Our reconstructions add information to previous regional and continental‐scale efforts in areas east of Svalbard. Ice retreat in the northern Barents Sea progressed as follows. (i) 19–16.5 ka. Major calving led to dynamic thinning in shelf troughs and was accompanied by significant ice‐sheet thinning inland as a result of ice drawdown. (ii) 16.5–15 ka. Rapid ice‐margin retreat of between 75–100 km occurred, via lift‐off and iceberg calving, in Hinlopen and Kvitøya troughs, as well as major retreat (>300 km) in Franz Victoria Trough (FVT) further east. (iii) 15–13.5 ka. Retreat progressed westwards from the FVT towards Svalbard with troughs east of Svalbard (Kvitøya, Olga, and Erik Eriksen) mostly ice‐free by 13.5 ka. (iv) 13.5–11.5 ka. Ice retreated gradually towards residual ice masses on Svalbard, Kong Karls Land and possibly Storbanken. Our data require a modification of earlier views of the BSIS because they point toward a more dynamic ice sheet and decay that, once initiated at the shelf break, was dominated by the withdrawal of ice from the FVT that progressed westwards towards the Svalbard archipelago.
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影响因子：
18.3
作者：
Rignot, Eric;Bamber, Jonathan L.;Van Meijgaard, Erik
通讯作者：
Van Meijgaard, Erik
南极洲西部阿蒙森海海湾近期沉积物和冰期沉积物之间的物源变化：粘土矿物组合证据
影响因子：
1.6
作者：
Ehrmann;Hillenbrand;Graham;Larter
通讯作者：
Larter
影响因子：
18.3
作者：
S. Jamieson;A. Vieli;S. Livingstone;C. Ó. Cofaigh;C. Stokes;C. Hillenbrand;J. Dowdeswell
通讯作者：
S. Jamieson;A. Vieli;S. Livingstone;C. Ó. Cofaigh;C. Stokes;C. Hillenbrand;J. Dowdeswell
晚威克塞尔冰盖从斯瓦尔巴群岛东部孔卡尔斯地周围水域全冰川流动和退缩的证据
影响因子：
4
作者：
Hogan K
通讯作者：
Hogan K