DOI: 10.5194/tc-15-485-2021
论文题名: Thinning leads to calving-style changes at Bowdoin Glacier, Greenland
作者: Van Dongen E.C.H. ; Jouvet G. ; Sugiyama S. ; Podolskiy E.A. ; Funk M. ; Benn D.I. ; Lindner F. ; Bauder A. ; Seguinot J. ; Leinss S. ; Walter F.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 2 起始页码: 485
结束页码: 500
语种: 英语
英文关键词: cryosphere
; glacier
; glacier flow
; ice core
; iceberg calving
; Arctic
; Bowdoin Glacier
; Greenland
英文摘要: Ice mass loss from the Greenland ice sheet is the largest single contributor to sea level rise in the 21st century. The mass loss rate has accelerated in recent decades mainly due to thinning and retreat of its outlet glaciers. The diverse calving mechanisms responsible for tidewater glacier retreat are not fully understood yet. Since a tidewater glacier's sensitivity to external forcings depends on its calving style, detailed insight into calving processes is necessary to improve projections of ice sheet mass loss by calving. As tidewater glaciers are mostly thinning, their calving styles are expected to change. Here, we study calving behaviour changes under a thinning regime at Bowdoin Glacier, north-western Greenland, by combining field and remote-sensing data from 2015 to 2019. Previous studies showed that major calving events in 2015 and 2017 were driven by hydro-fracturing and melt-undercutting. New observations from uncrewed aerial vehicle (UAV) imagery and a GPS network installed at the calving front in 2019 suggest ungrounding and buoyant calving have recently occurred as they show (1) increasing tidal modulation of vertical motion compared to previous years, (2) absence of a surface crevasse prior to calving, and (3) uplift and horizontal surface compression prior to calving. Furthermore, an inventory of calving events from 2015 to 2019 based on satellite imagery provides additional support for a change towards buoyant calving since it shows an increasing occurrence of calving events outside of the melt season. The observed change in calving style could lead to a possible retreat of the terminus, which has been stable since 2013. We therefore highlight the need for high-resolution monitoring to detect changing calving styles and numerical models that cover the full spectrum of calving mechanisms to improve projections of ice sheet mass loss by calving. © 2021 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164818
Appears in Collections: 气候变化与战略
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作者单位: Laboratory of Hydraulics Hydrology and Glaciology (VAW), ETH Zurich, Zurich, Switzerland; Department of Geography, University of Zurich, Zurich, Switzerland; Autonomous Systems Laboratory, ETH Zurich, Zurich, Switzerland; Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan; Department of Geography and Sustainable Development, University of St Andrews, St Andrews, United Kingdom; Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, Munich, Germany; Institute of Environmental Engineering, ETH Zurich, Zurich, Switzerland
Recommended Citation:
Van Dongen E.C.H.,Jouvet G.,Sugiyama S.,et al. Thinning leads to calving-style changes at Bowdoin Glacier, Greenland[J]. Cryosphere,2021-01-01,15(2)