气候变化领域集成服务门户(CCPortal): Effects of undercutting and sliding on calving: A global approach applied to Kronebreen, Svalbard

CCPortal

DOI	10.5194/tc-12-609-2018
	Effects of undercutting and sliding on calving: A global approach applied to Kronebreen, Svalbard
	Vallot D.; Åström J.; Zwinger T.; Pettersson R.; Everett A.; Benn D.I.; Luckman A.; Van Pelt W.J.J.; Nick F.; Kohler J.
发表日期	2018
ISSN	19940416
卷号	12 期号:2
英文摘要	In this paper, we study the effects of basal friction, sub-aqueous undercutting and glacier geometry on the calving process by combining six different models in an offline-coupled workflow: a continuum-mechanical ice flow model (Elmer/Ice), a climatic mass balance model, a simple subglacial hydrology model, a plume model, an undercutting model and a discrete particle model to investigate fracture dynamics (Helsinki Discrete Element Model, HiDEM). We demonstrate the feasibility of reproducing the observed calving retreat at the front of Kronebreen, a tidewater glacier in Svalbard, during a melt season by using the output from the first five models as input to HiDEM. Basal sliding and glacier motion are addressed using Elmer/Ice, while calving is modelled by HiDEM. A hydrology model calculates subglacial drainage paths and indicates two main outlets with different discharges. Depending on the discharge, the plume model computes frontal melt rates, which are iteratively projected to the actual front of the glacier at subglacial discharge locations. This produces undercutting of different sizes, as melt is concentrated close to the surface for high discharge and is more diffuse for low discharge. By testing different configurations, we show that undercutting plays a key role in glacier retreat and is necessary to reproduce observed retreat in the vicinity of the discharge locations during the melting season. Calving rates are also influenced by basal friction, through its effects on near-terminus strain rates and ice velocity. © Author(s) 2018.
学科领域	continuum mechanics; discharge; flow modeling; glacier mass balance; glacier retreat; global perspective; hydrological modeling; ice flow; iceberg calving; sliding; subglacial environment; tidewater glacier; Arctic; Kronebreen; Spitsbergen; Svalbard; Svalbard and Jan Mayen
语种	英语
scopus关键词	continuum mechanics; discharge; flow modeling; glacier mass balance; glacier retreat; global perspective; hydrological modeling; ice flow; iceberg calving; sliding; subglacial environment; tidewater glacier; Arctic; Kronebreen; Spitsbergen; Svalbard; Svalbard and Jan Mayen
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/119217
作者单位	Department of Earth Sciences, Uppsala University, Uppsala, Sweden; CSC - IT Center for Science, Espoo, Finland; Norwegian Polar Institute, Fram Centre, Tromsø, 9296, Norway; School of Geography and Sustainable Development, University of St Andrews, St Andrews, United Kingdom; Department of Geography, Swansea University, Swansea, United Kingdom; Department of Arctic Geophysics, UNIS, University Center in Svalbard, Longyearbyen, Norway; Arctic Geology Department, University Centre in Svalbard, Svalbard, Norway
推荐引用方式 GB/T 7714	Vallot D.,Åström J.,Zwinger T.,et al. Effects of undercutting and sliding on calving: A global approach applied to Kronebreen, Svalbard[J],2018,12(2).
APA	Vallot D..,Åström J..,Zwinger T..,Pettersson R..,Everett A..,...&Kohler J..(2018).Effects of undercutting and sliding on calving: A global approach applied to Kronebreen, Svalbard.Cryosphere,12(2).
MLA	Vallot D.,et al."Effects of undercutting and sliding on calving: A global approach applied to Kronebreen, Svalbard".Cryosphere 12.2(2018).