DOI: 10.5194/tc-12-609-2018
Scopus记录号: 2-s2.0-85042457214
论文题名: Effects of undercutting and sliding on calving: A global approach applied to Kronebreen, Svalbard
作者: Vallot D ; , Åström J ; , Zwinger T ; , Pettersson R ; , Everett A ; , Benn D ; I ; , Luckman A ; , Van Pelt W ; J ; J ; , Nick F ; , Kohler J
刊名: Cryosphere
ISSN: 19940416
出版年: 2018
卷: 12, 期: 2 起始页码: 609
结束页码: 625
语种: 英语
英文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75416
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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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, 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
Recommended Citation:
Vallot D,, Åström J,, Zwinger T,et al. Effects of undercutting and sliding on calving: A global approach applied to Kronebreen, Svalbard[J]. Cryosphere,2018-01-01,12(2)