Lateglacial and Holocene glacier activity in the Van Mijenfjorden area, western Svalbard
Lateglacial and Holocene glacier activity in the Van Mijenfjorden area, western Svalbard
复制标题
斯瓦尔巴特群岛西部 Van Mijenfjorden 地区的晚冰期和全新世冰川活动
DOI：
--
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
D. Ottesen
中科院分区：
文献类型：
--
作者：
E. Larsen;A. Lyså;L. Rubensdotter;W. Farnsworth;M. Jensen;M. Nadeau;D. Ottesen
对斯瓦尔巴特群岛 Van Mijenfjorden 地区的沉积学、形态学和年代学研究表明，在陆地和海洋档案中发现了从晚魏希瑟利期到小冰河期的许多冰川进展。整个峡湾系统中仅发现一处峡湾冰川退缩阶段的冰缘沉积物。该沉积物位于峡湾口基岩阈值附近的地形控制位置。支流山谷和峡湾的冰川记录对应于不同大小和类型的冰流，这些冰流与晚冰期和全新世早期该地区的冰川消退以及全新世早期、新冰期和小冰期期间冰川系统的再生有关。在新仙女木期，随着范米延峡湾冰川后退，南部支流发生了冰川前进，这可能是对峡湾后退的动态反应。另一次冰川从北部支流山谷推进发生在全新世早期。在海洋代理表明区域峡湾温暖的时期，冰川前进延伸到了小冰期（LIA）边缘之外的位置。在第三条内支流中发现了新冰川冰川的推进，该支流也比随后的 LIA 最大值延伸得更远。峡湾内部的保拉冰川系统在过去 650 年中至少涌动了五次，随后每次涌动的最大范围均小于前一次，导致保拉冰川质量总体下降。
Sedimentological, morphological and chronological studies of the Van Mijenfjorden region, Svalbard suggest numerous glacial advances seen in terrestrial and marine archives spanning from the Late Weichselian to the Little Ice Age. Only one ice-marginal deposit from the retreat phase of the fjord glacier is found along the entire fjord system. The deposit is located at a topographically controlled position near a bedrock threshold at the mouth of the fjord. Glacial records from tributary valleys and fjords correspond to varying sizes and styles of ice flow related to the deglaciation of the area during the Lateglacial and early Holocene as well as the regrowth of glacier systems during the early Holocene, the Neoglacial and the Little Ice Age. During the Younger Dryas, as the Van Mijen-fjord glacier retreated, a glacier advance took place in a southern tributary, probably as a dynamic response to the retreat in the fjord. Another glacier advance from a northern tributary valley took place during the early Holocene. This glacier advance extended to a position well outside the Little Ice Age (LIA) margins during a period in time when marine proxies suggest warm regional fjords. A Neoglacial glacier advance is identified in a third and inner tributary which also extends further than the subsequent LIA maximum. The Paula glacier system in the inner part of the fjord surged at least five times in the last 650 years, with each subsequent surge advance exhibiting less extensive maximum than the previous, resulting in an overall decrease in mass of the Paula glacier.