瑞士Pigne d'Arolla附近5个山谷冰川中部冰碛岩壁侵蚀速率的时空变化

IF 2.8 2区 地球科学 Q2 GEOGRAPHY, PHYSICAL
Katharina Wetterauer, Dirk Scherler
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引用次数: 0

摘要

摘要高高山冰川环境下岩壁侵蚀具有时间和空间上的差异。在冰川侧面的岩壁上,碎屑供应和冰上覆盖的变化将改变冰的消融。然而,量化冰川消融岩壁侵蚀的时空模式并非易事。在瑞士Pigne d'Arolla附近的五个山谷冰川中,我们利用中部冰碛碎屑中的10Be宇宙成因核素浓度([10Be])得出了岩壁的明显侵蚀速率。对6个中部冰碛进行了系统的冰川下采样,这些冰碛接收了不同方向、坡度和消冰史的岩壁碎片,使我们能够评估岩壁随时间的侵蚀,并研究不同的空间源岩壁形态如何在中部冰碛记录中表达出来[10Be]。我们的数据集结合了来自du Brenay冰川、de Cheilon冰川、de pi冰川和de Tsijiore Nouve冰川的24个新样本和来自d'Otemma冰川的15个已发表样本。对于每个样品,我们使用一个简单的碎屑颗粒轨迹模型模拟冰川碎屑运移,以近似碎屑侵蚀的时间,并校正测量的[10Be],以适应沉积后的10Be堆积。我们得出的岩壁表观侵蚀速率范围在~ 0.6和10.0毫米/年之间。最长的冰川下[10Be]记录可能可追溯到小冰期末期,并表明岩壁侵蚀率在过去~ 200年有系统地增加,而较短的记录仅涵盖最近冰川消退期的最后~ 100年,并表明在时间上更稳定的侵蚀率。对于碎屑侵蚀的估计时间,大多数源岩壁的冰盖变化很小,这表明我们的记录在很大程度上没有受到最近可能不同[10Be]的冰川消融基岩的影响,但不能排除每个地点的冰川下碎屑混合物。比较我们的地点表明,岩壁陡峭且朝北的地方岩壁侵蚀率更高,这表明Pigne d'Arolla周围的岩壁侵蚀存在潜在的坡度和温度控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Spatial and temporal variations in rockwall erosion rates derived from cosmogenic 10Be in medial moraines at five valley glaciers around Pigne d'Arolla, Switzerland
Abstract. Rockwall erosion in high-alpine glacial environments varies both temporally and spatially. Where rockwalls flank glaciers, changes in debris supply and supraglacial cover will modify ice ablation. Yet, quantifying spatiotemporal patterns in erosion across deglaciating rockwalls is not trivial. At five nearby valley glaciers around Pigne d'Arolla in Switzerland, we derived apparent rockwall erosion rates using 10Be cosmogenic nuclide concentrations ([10Be]) in medial moraine debris. Systematic downglacier sampling of six medial moraines that receive debris from rockwalls with differing orientation, slope, and deglaciation histories enabled us to assess rockwall erosion through time and to investigate how distinct spatial source rockwall morphology may express itself in medial moraine [10Be] records. Our dataset combines 24 new samples from medial moraines of Glacier du Brenay, Glacier de Cheilon, Glacier de Pièce, and Glacier de Tsijiore Nouve with 15 published samples from Glacier d'Otemma. For each sample, we simulated the glacial debris transport using a simple debris particle trajectory model to approximate the time of debris erosion and to correct the measured [10Be] for post-depositional 10Be accumulation. Our derived apparent rockwall erosion rates range between ∼ 0.6 and 10.0 mm yr−1. Whereas the longest downglacier [10Be] record presumably reaches back to the end of the Little Ice Age and suggests a systematic increase in rockwall erosion rates over the last ∼ 200 years, the shorter records only cover the last ∼ 100 years from the recent deglaciation period and indicate temporally more stable erosion rates. For the estimated time of debris erosion, ice cover changes across most source rockwalls were small, suggesting that our records are largely unaffected by the contribution of recently deglaciated bedrock of possibly different [10Be], but admixture of subglacially derived debris cannot be excluded at every site. Comparing our sites suggests that apparent rockwall erosion rates are higher where rockwalls are steep and north-facing, indicating a potential slope and temperature control on rockwall erosion around Pigne d'Arolla.
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来源期刊
Earth Surface Dynamics
Earth Surface Dynamics GEOGRAPHY, PHYSICALGEOSCIENCES, MULTIDISCI-GEOSCIENCES, MULTIDISCIPLINARY
CiteScore
5.40
自引率
5.90%
发文量
56
审稿时长
20 weeks
期刊介绍: Earth Surface Dynamics (ESurf) is an international scientific journal dedicated to the publication and discussion of high-quality research on the physical, chemical, and biological processes shaping Earth''s surface and their interactions on all scales.
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