DOI: 10.1016/j.quascirev.2018.07.004
Scopus记录号: 2-s2.0-85049920903
论文题名: Atmosphere-driven ice sheet mass loss paced by topography: Insights from modelling the south-western Scandinavian Ice Sheet
作者: Åkesson H. ; Morlighem M. ; Nisancioglu K.H. ; Svendsen J.I. ; Mangerud J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2018
卷: 195 起始页码: 32
结束页码: 47
语种: 英语
英文关键词: Deglaciation
; Eurasian ice sheet
; Grounding line dynamics
; Ice sheet modelling
; Ice-ocean interactions
; Marine-terminating glaciers
; Norway
; Scandinavian ice sheet
; Surface mass balance
; Younger dryas
Scopus关键词: Climate change
; Dynamics
; Glacial geology
; Glaciers
; Sea level
; Topography
; Deglaciations
; Grounding line
; Ice sheet
; Ice sheet modelling
; Ice-ocean interactions
; Norway
; Surface mass balance
; Younger Dryas
; Ice
; atmospheric forcing
; climate change
; deglaciation
; grounding line
; ice-ocean interaction
; mass balance
; modeling
; Scandinavian Ice Sheet
; topography
; Younger Dryas
; Eurasia
; Norway
英文摘要: Marine-terminating glaciers and ice streams are important controls of ice sheet mass balance. However, understanding of their long-term response to external forcing is limited by relatively short observational records of present-day glaciers and sparse geologic evidence for paleo-glaciers. Here we use a high-resolution ice sheet model with an accurate representation of grounding line dynamics to study the deglaciation of the marine-based south-western Norwegian sector of the Scandinavian Ice Sheet and its sensitivity to ocean and atmosphere forcing. We find that the regional response to a uniform climate change is highly dependent on the local bedrock topography, consistent with ice sheet reconstructions. Our simulations suggest that ocean warming is able to trigger initial retreat in several fjords, but is not sufficient to explain retreat everywhere. Widespread retreat requires additional ice thinning driven by surface melt. Once retreat is triggered, the underlying bedrock topography and fjord width control the rate and extent of retreat, while multi-millennial changes over the course of deglaciation are modulated by surface melt. We suggest that fjord geometry, ice-ocean interactions and grounding line dynamics are vital controls of decadal-to centennial scale ice sheet mass loss. However, we postulate that atmospheric changes are the most important drivers of widespread ice sheet demise, and will likely trump oceanic influence on future ice sheet mass loss and resulting sea level rise over centennial and longer time scales. © 2018 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/112093
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth Science, University of Bergen and Bjerknes Centre for Climate Research, Allégaten 70, Bergen, 5007, Norway; University of California, Irvine, Department of Earth System Science, 3218 Croul Hall, Irvine, CA 92697-3100, United States; Centre for Earth Evolution and Dynamics, University of Oslo, Postbox 1028 Blindern, Oslo, 0315, Norway
Recommended Citation:
Åkesson H.,Morlighem M.,Nisancioglu K.H.,et al. Atmosphere-driven ice sheet mass loss paced by topography: Insights from modelling the south-western Scandinavian Ice Sheet[J]. Quaternary Science Reviews,2018-01-01,195