Younger Dryas and Early Holocene ice-margin dynamics in northwest Russia

IF 2.4 3区 地球科学 Q2 GEOGRAPHY, PHYSICAL Boreas Pub Date : 2024-03-03 DOI:10.1111/bor.12653
Benjamin M. Boyes, Danni M. Pearce, Lorna D. Linch, David J. Nash
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Abstract

The dynamics of the last Fennoscandian Ice Sheet (FIS) are relatively well constrained in the Nordic countries. Ice-sheet dynamics in NW Russia, however, are comparatively less well understood owing to the scale and resolution of existing studies. New large-scale glacial geomorphological datasets from NW Russia based on high-resolution remotely sensed imagery allow for an independent reassessment of the extent and dynamics of the FIS during the Younger Dryas and Early Holocene (c. 12.9–10 ka) in NW Russia. The reconstruction provides a more detailed link between geomorphological expressions of palaeoglaciation than previous proposals. Rather than a continuous Younger Dryas ice marginal zone (IMZ) stretching from Finland to northern Norway, the geomorphological signature of NW Russia reveals 14 IMZs that document discrete stationary ice-margin positions (possibly standstill and/or readvance events) during the overall retreat. The relative age sequence of the IMZs, supported by an updated numerical age database, suggests that they formed time-transgressively during the Younger Dryas and Early Holocene rather than contemporaneously. Moreover, specific landform assemblages reveal contrasting glacial landsystems in NW Russia: (i) a northern subpolar glacial landsystem; and (ii) a southern temperate glacial landsystem. The model presented herein provides robust empirical constraints for testing and validating numerical ice-sheet models and understanding ice-sheet responses to rapid climate change.

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俄罗斯西北部较新世和全新世早期的冰缘动力学
在北欧国家,最后的芬诺斯坎迪亚冰原(FIS)的动态变化相对较好。然而,由于现有研究的规模和分辨率,对俄罗斯西北部冰原动态的了解相对较少。基于高分辨率遥感图像的俄罗斯西北部新的大尺度冰川地貌数据集允许对俄罗斯西北部小干纪和全新世早期(约 12.9-10 ka)的冰川地貌系统的范围和动态进行独立的重新评估。与之前的方案相比,该重建方案提供了古冰期地貌表现形式之间更详细的联系。俄罗斯西北部的地貌特征揭示了 14 个冰缘区,而不是一个从芬兰延伸到挪威北部的连续的幼年干冰期冰缘区(IMZ),这些冰缘区记录了整体退缩过程中离散的静止冰缘位置(可能是停滞和/或再退缩事件)。根据最新的数字年龄数据库,这些冰缘区的相对年龄序列表明,它们是在小干纪和全新世早期形成的,而不是同时形成的。此外,特定的地貌组合揭示了俄罗斯西北部截然不同的冰川地貌系统:(i) 北部亚极地冰川地貌系统;(ii) 南部温带冰川地貌系统。本文介绍的模型为测试和验证冰盖数值模型以及了解冰盖对快速气候变化的响应提供了强有力的经验约束。
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来源期刊
Boreas
Boreas 地学-地球科学综合
CiteScore
5.90
自引率
4.50%
发文量
36
审稿时长
>12 weeks
期刊介绍: Boreas has been published since 1972. Articles of wide international interest from all branches of Quaternary research are published. Biological as well as non-biological aspects of the Quaternary environment, in both glaciated and non-glaciated areas, are dealt with: Climate, shore displacement, glacial features, landforms, sediments, organisms and their habitat, and stratigraphical and chronological relationships. Anticipated international interest, at least within a continent or a considerable part of it, is a main criterion for the acceptance of papers. Besides articles, short items like discussion contributions and book reviews are published.
期刊最新文献
Issue Information Boreas Reviewers, volume 53 Late Middle Pleistocene (MIS 11-6) in Europe – introduction Late Middle Pleistocene Wolstonian Stage (MIS 6) glaciation in lowland Britain and its North Sea regional equivalents – a review Issue Information
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