气候变化领域集成服务门户(CCPortal): Twenty-first century ocean forcing of the Greenland ice sheet for modelling of sea level contribution

CCPortal

DOI	10.5194/tc-14-985-2020
	Twenty-first century ocean forcing of the Greenland ice sheet for modelling of sea level contribution
	Slater D.A.; Felikson D.; Straneo F.; Goelzer H.; Little C.M.; Morlighem M.; Fettweis X.; Nowicki S.
发表日期	2020
ISSN	19940416
起始页码	985
结束页码	1008
卷号	14 期号:3
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.
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
语种	英语
来源期刊	Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202210
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
推荐引用方式 GB/T 7714	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],2020,14(3).
APA	Slater D.A..,Felikson D..,Straneo F..,Goelzer H..,Little C.M..,...&Nowicki S..(2020).Twenty-first century ocean forcing of the Greenland ice sheet for modelling of sea level contribution.Cryosphere,14(3).
MLA	Slater D.A.,et al."Twenty-first century ocean forcing of the Greenland ice sheet for modelling of sea level contribution".Cryosphere 14.3(2020).