气候变化领域集成服务门户(CCPortal): Estimating Greenland tidewater glacier retreat driven by submarine melting

CCPortal

DOI	10.5194/tc-13-2489-2019
	Estimating Greenland tidewater glacier retreat driven by submarine melting
	Slater D.A.; Straneo F.; Felikson D.; Little C.M.; Goelzer H.; Fettweis X.; Holte J.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	2489
结束页码	2509
卷号	13 期号:9
英文摘要	The effect of the North Atlantic Ocean on the Greenland Ice Sheet through submarine melting of Greenland's tidewater glacier calving fronts is thought to be a key driver of widespread glacier retreat, dynamic mass loss and sea level contribution from the ice sheet. Despite its critical importance, problems of process complexity and scale hinder efforts to represent the influence of submarine melting in ice-sheet-scale models. Here we propose parameterizing tidewater glacier terminus position as a simple linear function of submarine melting, with submarine melting in turn estimated as a function of subglacial discharge and ocean temperature. The relationship is tested, calibrated and validated using datasets of terminus position, subglacial discharge and ocean temperature covering the full ice sheet and surrounding ocean from the period 1960-2018. We demonstrate a statistically significant link between multi-decadal tidewater glacier terminus position change and submarine melting and show that the proposed parameterization has predictive power when considering a population of glaciers. An illustrative 21st century projection is considered, suggesting that tidewater glaciers in Greenland will undergo little further retreat in a low-emission RCP2.6 scenario. In contrast, a high-emission RCP8.5 scenario results in a median retreat of 4.2 km, with a quarter of tidewater glaciers experiencing retreat exceeding 10 km. Our study provides a long-term and ice-sheet-wide assessment of the sensitivity of tidewater glaciers to submarine melting and proposes a practical and empirically validated means of incorporating ocean forcing into models of the Greenland ice sheet. © 2019 All rights reserved.
学科领域	estimation method; glacier retreat; melting; sea level; sea level change; subglacial environment; tidewater glacier; Arctic; Atlantic Ocean; Atlantic Ocean (North); Greenland; Greenland Ice Sheet
语种	英语
scopus关键词	estimation method; glacier retreat; melting; sea level; sea level change; subglacial environment; tidewater glacier; Arctic; Atlantic Ocean; Atlantic Ocean (North); Greenland; Greenland Ice Sheet
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118833
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; Atmospheric and Environmental Research, Inc., Lexington, MA, United States; Utrecht University, Institute for Marine and Atmospheric Research, Utrecht, Netherlands; Laboratoire de Glaciologie, Université Libre de Bruxelles, Brussels, Belgium; Laboratory of Climatology, Department of Geography, University of Liège, Liège, Belgium
推荐引用方式 GB/T 7714	Slater D.A.,Straneo F.,Felikson D.,et al. Estimating Greenland tidewater glacier retreat driven by submarine melting[J],2019,13(9).
APA	Slater D.A..,Straneo F..,Felikson D..,Little C.M..,Goelzer H..,...&Holte J..(2019).Estimating Greenland tidewater glacier retreat driven by submarine melting.The Cryosphere,13(9).
MLA	Slater D.A.,et al."Estimating Greenland tidewater glacier retreat driven by submarine melting".The Cryosphere 13.9(2019).