DOI: 10.5194/tc-14-985-2020
论文题名: Twenty-first century ocean forcing of the Greenland ice sheet for modelling of sea level contribution
作者: Slater D.A. ; Felikson D. ; Straneo F. ; Goelzer H. ; Little C.M. ; Morlighem M. ; Fettweis X. ; Nowicki S.
刊名: Cryosphere
ISSN: 19940416
出版年: 2020
卷: 14, 期: 3 起始页码: 985
结束页码: 1008
语种: 英语
英文关键词: boundary condition
; caving
; discharge
; fjord
; glacier retreat
; ice sheet
; Intergovernmental Panel on Climate Change
; plume
; shelf dynamics
; submarine
; Arctic
; Greenland
; Greenland Ice Sheet
英文摘要: Changes in ocean temperature and salinity are expected to be an important determinant of the Greenland ice sheet's future sea level contribution. Yet, simulating the impact of these changes in continental-scale ice sheet models remains challenging due to the small scale of key physics, such as fjord circulation and plume dynamics, and poor understanding of critical processes, such as calving and submarine melting. Here we present the ocean forcing strategy for Greenland ice sheet models taking part in the Ice Sheet Model Intercomparison Project for CMIP6 (ISMIP6), the primary community effort to provide 21st century sea level projections for the Intergovernmental Panel on Climate Change Sixth Assessment Report. Beginning from global atmosphere-ocean general circulation models, we describe two complementary approaches to provide ocean boundary conditions for Greenland ice sheet models, termed the "retreat" and "submarine melt" implementations. The retreat implementation parameterises glacier retreat as a function of projected subglacial discharge and ocean thermal forcing, is designed to be implementable by all ice sheet models and results in retreat of around 1 and 15 km by 2100 in RCP2.6 and 8.5 scenarios, respectively. The submarine melt implementation provides estimated submarine melting only, leaving the ice sheet model to solve for the resulting calving and glacier retreat and suggests submarine melt rates will change little under RCP2.6 but will approximately triple by 2100 under RCP8.5. Both implementations have necessarily made use of simplifying assumptions and poorly constrained parameterisations and, as such, further research on submarine melting, calving and fjord-shelf exchange should remain a priority. Nevertheless, the presented framework will allow an ensemble of Greenland ice sheet models to be systematically and consistently forced by the ocean for the first time and should result in a significant improvement in projections of the Greenland ice sheet's contribution to future sea level change. © 2020 AVS Science and Technology Society. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164588
Appears in Collections: 气候变化与战略
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作者单位: Scripps Institution of Oceanography, University of California San Diego, San diego, CA, United States; Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States; Institute for Marine and Atmospheric Research Utrecht, Utrecht University, Utrecht, Netherlands; Laboratoire de Glaciologie, Université Libre de Bruxelles, Brussels, Belgium; Atmospheric and Environmental Research Inc., Lexington, MA, United States; Department of Earth System Science, University of California, Irvine, CA, United States; Laboratory of Climatology, SPHERES Research Unit, University of Liège, Liège, Belgium
Recommended Citation:
Slater D.A.,Felikson D.,Straneo F.,et al. Twenty-first century ocean forcing of the Greenland ice sheet for modelling of sea level contribution[J]. Cryosphere,2020-01-01,14(3)