气候变化领域集成服务门户(CCPortal): A balanced water layer concept for subglacial hydrology in large-scale ice sheet models

CCPortal

DOI	10.5194/tc-7-1095-2013
	A balanced water layer concept for subglacial hydrology in large-scale ice sheet models
	Goeller S.; Thoma M.; Grosfeld K.; Miller H.
发表日期	2013
ISSN	19940416
卷号	7 期号:4
英文摘要	There is currently no doubt about the existence of a widespread hydrological network under the Antarctic Ice Sheet, which lubricates the ice base and thus leads to increased ice velocities. Consequently, ice models should incorporate basal hydrology to obtain meaningful results for future ice dynamics and their contribution to global sea level rise. Here, we introduce the balanced water layer concept, covering two prominent subglacial hydrological features for ice sheet modeling on a continental scale: the evolution of subglacial lakes and balance water fluxes. We couple it to the thermomechanical ice-flow model RIMBAY and apply it to a synthetic model domain. In our experiments we demonstrate the dynamic generation of subglacial lakes and their impact on the velocity field of the overlaying ice sheet, resulting in a negative ice mass balance. Furthermore, we introduce an elementary parametrization of the water flux-basal sliding coupling and reveal the predominance of the ice loss through the resulting ice streams against the stabilizing influence of less hydrologically active areas. We point out that established balance flux schemes quantify these effects only partially as their ability to store subglacial water is lacking. © Author(s) 2013.
学科领域	dominance; flow modeling; hydrology; ice movement; ice sheet; mass balance; parameterization; subglacial environment; thermomechanics; water budget; Southern Ocean
语种	英语
scopus关键词	dominance; flow modeling; hydrology; ice movement; ice sheet; mass balance; parameterization; subglacial environment; thermomechanics; water budget; Southern Ocean
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/120287
作者单位	Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, 27568 Bremerhaven, Germany
推荐引用方式 GB/T 7714	Goeller S.,Thoma M.,Grosfeld K.,et al. A balanced water layer concept for subglacial hydrology in large-scale ice sheet models[J],2013,7(4).
APA	Goeller S.,Thoma M.,Grosfeld K.,&Miller H..(2013).A balanced water layer concept for subglacial hydrology in large-scale ice sheet models.Cryosphere,7(4).
MLA	Goeller S.,et al."A balanced water layer concept for subglacial hydrology in large-scale ice sheet models".Cryosphere 7.4(2013).