气候变化领域集成服务门户(CCPortal): Sensitivity of Greenland ice sheet projections to spatial resolution in higher-order simulations: The Alfred Wegener Institute (AWI) contribution to ISMIP6 Greenland using the Ice-sheet and Sea-level System Model (ISSM)

CCPortal

DOI	10.5194/tc-14-3309-2020
	Sensitivity of Greenland ice sheet projections to spatial resolution in higher-order simulations: The Alfred Wegener Institute (AWI) contribution to ISMIP6 Greenland using the Ice-sheet and Sea-level System Model (ISSM)
	Rückamp M.; Goelzer H.; Humbert A.
发表日期	2020
ISSN	19940416
起始页码	3309
结束页码	3327
卷号	14 期号:10
英文摘要	Projections of the contribution of the Greenland ice sheet to future sea-level rise include uncertainties primarily due to the imposed climate forcing and the initial state of the ice sheet model. Several state-of-the-art ice flow models are currently being employed on various grid resolutions to estimate future mass changes in the framework of the Ice Sheet Model Intercomparison Project for CMIP6 (ISMIP6). Here we investigate the sensitivity to grid resolution of centennial sea-level contributions from the Greenland ice sheet and study the mechanism at play.We employ the finiteelement higher-order Ice-sheet and Sea-level System Model (ISSM) and conduct experiments with four different horizontal resolutions, namely 4, 2, 1 and 0.75 km. We run the simulation based on the ISMIP6 core climate forcing from the MIROC5 global circulation model (GCM) under the highemission Representative Concentration Pathway (RCP) 8.5 scenario and consider both atmospheric and oceanic forcing in full and separate scenarios. Under the full scenarios, finer simulations unveil up to approximately 5% more sea-level rise compared to the coarser resolution. The sensitivity depends on the magnitude of outlet glacier retreat, which is implemented as a series of retreat masks following the ISMIP6 protocol. Without imposed retreat under atmosphereonly forcing, the resolution dependency exhibits an opposite behaviour with approximately 5% more sea-level contribution in the coarser resolution. The sea-level contribution indicates a converging behaviour below a 1 km horizontal resolution. A driving mechanism for differences is the ability to resolve the bedrock topography, which highly controls ice discharge to the ocean. Additionally, thinning and acceleration emerge to propagate further inland in high resolution for many glaciers. A major response mechanism is sliding, with an enhanced feedback on the effective normal pressure at higher resolution leading to a larger increase in sliding speeds under scenarios with outlet glacier retreat. © 2020 Copernicus GmbH. All rights reserved.
英文关键词	bedrock; climate forcing; CMIP; discharge; ice flow; ice sheet; sea level change; spatial resolution; thinning; topography; 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/202198
作者单位	Alfred-Wegener-Institut Helmholtz-Zentrum für Polar-und Meeresforschung, Bremerhaven, Germany; Institute for Marine and Atmospheric Research (IMAU), Utrecht University, Utrecht, Netherlands; Laboratoire de Glaciologie, Université Libre de Bruxelles, Brussels, Belgium; NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway; Faculty of Geosciences, University of Bremen, Bremen, Germany
推荐引用方式 GB/T 7714	Rückamp M.,Goelzer H.,Humbert A.. Sensitivity of Greenland ice sheet projections to spatial resolution in higher-order simulations: The Alfred Wegener Institute (AWI) contribution to ISMIP6 Greenland using the Ice-sheet and Sea-level System Model (ISSM)[J],2020,14(10).
APA	Rückamp M.,Goelzer H.,&Humbert A..(2020).Sensitivity of Greenland ice sheet projections to spatial resolution in higher-order simulations: The Alfred Wegener Institute (AWI) contribution to ISMIP6 Greenland using the Ice-sheet and Sea-level System Model (ISSM).Cryosphere,14(10).
MLA	Rückamp M.,et al."Sensitivity of Greenland ice sheet projections to spatial resolution in higher-order simulations: The Alfred Wegener Institute (AWI) contribution to ISMIP6 Greenland using the Ice-sheet and Sea-level System Model (ISSM)".Cryosphere 14.10(2020).