DOI: 10.1002/2016GL070258
论文题名: 10Be measurements in bedrock constrain erosion beneath the Greenland Ice Sheet margin
作者: Young N.E. ; Briner J.P. ; Maurer J. ; Schaefer J.M.
刊名: Geophysical Research Letters
ISSN: 0094-8405
EISSN: 1944-8136
出版年: 2016
卷: 43, 期: 22 起始页码: 11708
结束页码: 11719
语种: 英语
英文关键词: 10Be
; cosmogenic nuclides
; erosion
; Greenland Ice Sheet
Scopus关键词: Abrasion
; Erosion
; Glacial geology
; Glaciers
; Abrasion rates
; Bedrock surfaces
; Cosmogenic nuclides
; Glacial erosion
; Greenland Ice Sheet
; Landscape evolutions
; Regional climate
; Thermal regimes
; Ice
英文摘要: Glacial erosion is a key process driving landscape evolution, but it remains unclear what factors dictate the rate at which subglacial erosion occurs. Moreover, estimates of subglacial erosion that do not rely on sediment flux techniques are rare. Here, we present in situ 10Be measurements from bedrock surfaces in western Greenland with well-constrained ice-cover histories to quantify the erosion rate beneath the Greenland Ice Sheet margin during historical times. We calculate an abrasion rate of 0.72 ± 0.35 mm yr−1 and a likely total basin-wide erosion rate (abrasion + quarrying) of ~1–1.8 mm yr−1, which are at least 1 order of magnitude higher than typical subglacial erosion rates in other polar landscapes. A compilation of published 10Be data suggests that the southwestern Greenland Ice Sheet acts as a particularly effective erosional agent within the broader Baffin Bay-Greenland region over millennial to glacial-interglacial timescales, suggestive of a basal ice sheet thermal regime controlled by regional climate. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85002928606&doi=10.1002%2f2016GL070258&partnerID=40&md5=ca8cb6d9478bf7d4535ffc69500c9628
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9368
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, United States
Recommended Citation:
Young N.E.,Briner J.P.,Maurer J.,et al. 10Be measurements in bedrock constrain erosion beneath the Greenland Ice Sheet margin[J]. Geophysical Research Letters,2016-01-01,43(22).