气候变化领域集成服务门户(CCPortal): Coupled modelling of subglacial hydrology and calving-front melting at Store Glacier, West Greenland

CCPortal

DOI	10.5194/tc-14-905-2020
	Coupled modelling of subglacial hydrology and calving-front melting at Store Glacier, West Greenland
	Cook S.J.; Christoffersen P.; Todd J.; Slater D.; Chauché N.
发表日期	2020
ISSN	19940416
起始页码	905
结束页码	924
卷号	14 期号:3
英文摘要	We investigate the subglacial hydrology of Store Glacier in West Greenland, using the open-source, fullStokes model Elmer/Ice in a novel 3D application that includes a distributed water sheet, as well as discrete channelised drainage, and a 1D model to simulate submarine plumes at the calving front. At first, we produce a baseline winter scenario with no surface meltwater. We then investigate the hydrological system during summer, focussing specifically on 2012 and 2017, which provide examples of high and low surface-meltwater inputs, respectively. We show that the common assumption of zero winter freshwater flux is invalid, and we find channels over 1 m2 in area occurring up to 5 km inland in winter. We also find that the production of water from friction and geothermal heat is sufficiently high to drive year-round plume activity, with ice-front melting averaging 0.15 m d-1. When the model is forced with seasonally averaged surface melt from summer, we show a hydrological system with significant distributed sheet activity extending 65 and 45 km inland in 2012 and 2017, respectively; while channels with a cross-sectional area higher than 1 m2 form as far as 55 and 30 km inland. Using daily values for the surface melt as forcing, we find only a weak relationship between the input of surface meltwater and the intensity of plume melting at the calving front, whereas there is a strong correlation between surface-meltwater peaks and basal water pressures. The former shows that storage of water on multiple timescales within the subglacial drainage system plays an important role in modulating subglacial discharge. The latter shows that high melt inputs can drive high basal water pressures even when the channelised network grows larger. This has implications for the future velocity and mass loss of Store Glacier, and the consequent sea-level rise, in a warming world. © 2020 Author(s).
英文关键词	discharge; glacial hydrology; iceberg calving; melting; meltwater; numerical model; subglacial environment; three-dimensional modeling; Arctic; Greenland; Store Glacier
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/202055
作者单位	Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom; Department of Geography and Sustainable Development, University of St.Andrews, St.Andrews, United Kingdom; Scripps Institution of Oceanography, San Diego, United States; Access Arctic, Le Vieux Marigny 58160, Sauvigny-les-Bois, France
推荐引用方式 GB/T 7714	Cook S.J.,Christoffersen P.,Todd J.,et al. Coupled modelling of subglacial hydrology and calving-front melting at Store Glacier, West Greenland[J],2020,14(3).
APA	Cook S.J.,Christoffersen P.,Todd J.,Slater D.,&Chauché N..(2020).Coupled modelling of subglacial hydrology and calving-front melting at Store Glacier, West Greenland.Cryosphere,14(3).
MLA	Cook S.J.,et al."Coupled modelling of subglacial hydrology and calving-front melting at Store Glacier, West Greenland".Cryosphere 14.3(2020).