DOI: 10.1002/2015GL065782
论文题名: Reactivation of Kamb Ice Stream tributaries triggers century-scale reorganization of Siple Coast ice flow in West Antarctica
作者: Bougamont M. ; Christoffersen P. ; Price S.F. ; Fricker H.A. ; Tulaczyk S. ; Carter S.P.
刊名: Geophysical Research Letters
ISSN: 0094-9188
EISSN: 1944-8919
出版年: 2015
卷: 42, 期: 20 起始页码: 8471
结束页码: 8480
语种: 英语
英文关键词: basal processes
; ice flow modeling
; mass balance
; subglacial hydrology
; thermodynamics
; West Antarctic ice sheet
Scopus关键词: Geothermal energy
; Glacial geology
; Glaciers
; Heat flux
; Sea level
; Thermodynamics
; Flow variability
; Hydrological system
; Ice sheet models
; Ice-flow models
; Mass balance
; Subglacial hydrology
; Subglacial water transport
; West antarctic ice sheets
; Ice
; flow modeling
; glacial hydrology
; ice flow
; ice sheet
; instability
; mass balance
; reactivation
; sea level change
; subglacial environment
; thermodynamics
; three-dimensional modeling
; till
; water flow
; Antarctic Ice Sheet
; Antarctica
; Kamb Ice Stream
; Ross Ice Shelf
; Siple Coast
; West Antarctic Ice Sheet
; West Antarctica
英文摘要: Ongoing, centennial-scale flow variability within the Ross ice streams of West Antarctica suggests that the present-day positive mass balance in this region may reverse in the future. Here we use a three-dimensional ice sheet model to simulate ice flow in this region over 250 years. The flow responds to changing basal properties, as a subglacial till layer interacts with water transported in an active subglacial hydrological system. We show that a persistent weak bed beneath the tributaries of the dormant Kamb Ice Stream is a source of internal ice flow instability, which reorganizes all ice streams in this region, leading to a reduced (positive) mass balance within decades and a net loss of ice within two centuries. This hitherto unaccounted for flow variability could raise sea level by 5 mm this century. Better constraints on future sea level change from this region will require improved estimates of geothermal heat flux and subglacial water transport. Key Points Modeled restructuring of the Siple Coast ice streams replicates past flow features Kamb Ice Stream tributaries are the source of regional ice flow instability Reduced regional mass balance could increase sea level by 5 mm in 100 years © 2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946547209&doi=10.1002%2f2015GL065782&partnerID=40&md5=af5551e76dd3b683da8fedda56dd3613
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8804
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Scott Polar Research Institute, University of Cambridge, Cambridge, United Kingdom
Recommended Citation:
Bougamont M.,Christoffersen P.,Price S.F.,et al. Reactivation of Kamb Ice Stream tributaries triggers century-scale reorganization of Siple Coast ice flow in West Antarctica[J]. Geophysical Research Letters,2015-01-01,42(20).