Deglaciation of Fennoscandia
Deglaciation of Fennoscandia
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DOI：
10.1016/j.quascirev.2015.09.016
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发表时间：
2016-09-01
影响因子：
4
通讯作者：
Jansson, Krister N.
中科院分区：
文献类型：
--
作者：
Stroeven, Arjen P.;Hattestrand, Clas;Jansson, Krister N.
为了提供一个新的重建芬诺斯堪的纳维亚冰盖的冰川消退，在一年的时间切片的形式，这是特别有用的冰盖建模，我们已经汇编和合成出版的地貌数据eskers，冰边缘的地层，线理，边缘融水通道，条纹，冰坝湖泊，和地质年代学数据从放射性碳，纹，光刺激发光，和宇宙成因核素年代测定。这被总结为芬诺斯堪的纳维亚冰盖的冰川消退图，其中等时线在22和13卡尔·凯尔BP之间每1000年标记一次，在11.6和9.7卡尔·凯尔BP之后的最终冰衰退之间每百年标记一次。反映了气候和地貌环境以及冰盖基本热条件和陆地与海洋边缘的差异。例如，西部高降水沿海地区的冰盖边缘对气候变化反应敏感，在许多峡湾和沿海山谷留下了突出的冰碛和其他冰缘沉积物的详细记录。整个南部部门的撤退率不同的缓慢撤退的陆地边缘在瑞典西部和南部和快速撤退的崩解冰边缘在波罗的海盆地。我们的重建与许多已发表的研究结果一致。然而，大量现有和新数据的综合支持在某些领域的精细重建。例如，俄罗斯西北部冰盖的LGM范围位于远东，它发生的时间比冰盖的其他部分晚，大约在17-15 cal kyr BP。我们还提出了一个略有不同的年表瑞典南部的冰碛形成的基础上改进的冰碛段的相关性，使用新的激光雷达数据和绑定冰碛形成的时间格陵兰冰芯冷stages.Retreat率变化多达一个数量级的不同部门的冰盖，与高海拔和海洋挪威保证金的最低利率。退缩率相比，格陵兰冰芯记录提供的气候信息显示退缩率和气候强迫之间的一般对应关系，虽然退缩率和气候之间的密切匹配是不可能的，因为其他的控制，如地形和海洋与陆地边缘。总的来说，芬诺斯堪的纳维亚冰盖消融的时间片重建从22至9.7卡尔Kyr BP提供了一个重要的数据集，了解的背景下，支持的空间和时间模式的退缩芬诺斯堪的纳维亚冰盖，是一个重要的资源，用于测试和完善冰盖模型。(C)2015年，作者。爱思唯尔有限公司出版
To provide a new reconstruction of the deglaciation of the Fennoscandian Ice Sheet, in the form of calendar-year time-slices, which are particularly useful for ice sheet modelling, we have compiled and synthesized published geomorphological data for eskers, ice-marginal formations, lineations, marginal meltwater channels, striae, ice-dammed lakes, and geochronological data from radiocarbon, varve, optically-stimulated luminescence, and cosmogenic nuclide dating. This is summarized as a deglaciation map of the Fennoscandian Ice Sheet with isochrons marking every 1000 years between 22 and 13 cal kyr BP and every hundred years between 11.6 and final ice decay after 9.7 cal kyr BP.Deglaciation patterns vary across the Fennoscandian Ice Sheet domain, reflecting differences in climatic and geomorphic settings as well as ice sheet basal thermal conditions and terrestrial versus marine margins. For example, the ice sheet margin in the high-precipitation coastal setting of the western sector responded sensitively to climatic variations leaving a detailed record of prominent moraines and other ice-marginal deposits in many fjords and coastal valleys. Retreat rates across the southern sector differed between slow retreat of the terrestrial margin in western and southern Sweden and rapid retreat of the calving ice margin in the Baltic Basin. Our reconstruction is consistent with much of the published research. However, the synthesis of a large amount of existing and new data support refined reconstructions in some areas. For example, the LGM extent of the ice sheet in northwestern Russia was located far east and it occurred at a later time than the rest of the ice sheet, at around 17-15 cal kyr BP. We also propose a slightly different chronology of moraine formation over southern Sweden based on improved correlations of moraine segments using new LiDAR data and tying the timing of moraine formation to Greenland ice core cold stages.Retreat rates vary by as much as an order of magnitude in different sectors of the ice sheet, with the lowest rates on the high-elevation and maritime Norwegian margin. Retreat rates compared to the climatic information provided by the Greenland ice core record show a general correspondence between retreat rate and climatic forcing, although a close match between retreat rate and climate is unlikely because of other controls, such as topography and marine versus terrestrial margins. Overall, the time slice reconstructions of Fennoscandian Ice Sheet deglaciation from 22 to 9.7 cal kyr BP provide an important dataset for understanding the contexts that underpin spatial and temporal patterns in retreat of the Fennoscandian Ice Sheet, and are an important resource for testing and refining ice sheet models. (C) 2015 The Authors. Published by Elsevier Ltd.