DOI: 10.5194/tc-15-113-2021
论文题名: Drivers of Pine Island Glacier speed-up between 1996 and 2016
作者: De Rydt J. ; Reese R. ; Paolo F.S. ; Hilmar Gudmundsson G.
刊名: Cryosphere
ISSN: 19940416
出版年: 2021
卷: 15, 期: 1 起始页码: 113
结束页码: 132
语种: 英语
英文关键词: data assimilation
; floating ice
; grounding line
; ice flow
; ice shelf
; ice thickness
; iceberg calving
; remote sensing
; rheology
; sea level
; viscosity
; Antarctica
; Pine Island Glacier
; West Antarctica
; West Antarctica
英文摘要: Pine Island Glacier in West Antarctica is among the fastest changing glaciers worldwide. Over the last 2 decades, the glacier has lost in excess of a trillion tons of ice, or the equivalent of 3mm of sea level rise. The ongoing changes are thought to have been triggered by ocean-induced thinning of its floating ice shelf, grounding line retreat, and the associated reduction in buttressing forces. However, other drivers of change, such as large-scale calving and changes in ice rheology and basal slipperiness, could play a vital, yet unquantified, role in controlling the ongoing and future evolution of the glacier. In addition, recent studies have shown that mechanical properties of the bed are key to explaining the observed speed-up. Here we used a combination of the latest remote sensing datasets between 1996 and 2016, data assimilation tools, and numerical perturbation experiments to quantify the relative importance of all processes in driving the recent changes in Pine Island Glacier dynamics. We show that (1) calving and ice shelf thinning have caused a comparable reduction in ice shelf buttressing over the past 2 decades; that (2) simulated changes in ice flow over a viscously deforming bed are only compatible with observations if large and widespread changes in ice viscosity and/or basal slipperiness are taken into account; and that (3) a spatially varying, predominantly plastic bed rheology can closely reproduce observed changes in flow without marked variations in ice-internal and basal properties. Our results demonstrate that, in addition to its evolving ice thickness, calving processes and a heterogeneous bed rheology play a key role in the contemporary evolution of Pine Island Glacier. © 2021 Copernicus GmbH. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164673
Appears in Collections: 气候变化与战略
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作者单位: Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, United Kingdom; Potsdam Institute for Climate Impact Research (PIK), Member of the Leibniz Association, Potsdam, Germany; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
De Rydt J.,Reese R.,Paolo F.S.,et al. Drivers of Pine Island Glacier speed-up between 1996 and 2016[J]. Cryosphere,2021-01-01,15(1)