DOI: 10.1016/j.gloplacha.2016.09.010
论文题名: Distributed ice thickness and glacier volume in southern South America
作者: Carrivick J.L. ; Davies B.J. ; James W.H.M. ; Quincey D.J. ; Glasser N.F.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 146 起始页码: 122
结束页码: 132
语种: 英语
英文关键词: Hypsometry
; Overdeepening
; Patagonia
; Sea level equivalent
; Sea level rise
; South America
; Subglacial topography
Scopus关键词: Catchments
; Sea level
; Topography
; Water resources
; Hypsometry
; Overdeepening
; Patagonia
; Sea level rise
; South America
; Ice
英文摘要: South American glaciers, including those in Patagonia, presently contribute the largest amount of meltwater to sea level rise per unit glacier area in the world. Yet understanding of the mechanisms behind the associated glacier mass balance changes remains unquantified partly because models are hindered by a lack of knowledge of subglacial topography. This study applied a perfect-plasticity model along glacier centre-lines to derive a first-order estimate of ice thickness and then interpolated these thickness estimates across glacier areas. This produced the first complete coverage of distributed ice thickness, bed topography and volume for 617 glaciers between 41°S and 55°S and in 24 major glacier regions. Maximum modelled ice thicknesses reach 1631 m ± 179 m in the South Patagonian Icefield (SPI), 1315 m ± 145 m in the North Patagonian Icefield (NPI) and 936 m ± 103 m in Cordillera Darwin. The total modelled volume of ice is 1234.6 km3 ± 246.8 km3 for the NPI, 4326.6 km3 ± 865.2 km3 for the SPI and 151.9 km3 ± 30.38 km3 for Cordillera Darwin. The total volume was modelled to be 5955 km3 ± 1191 km3, which equates to 5458.3 Gt ± 1091.6 Gt ice and to 15.08 mm ± 3.01 mm sea level equivalent (SLE). However, a total area of 655 km2 contains ice below sea level and there are 282 individual overdeepenings with a mean depth of 38 m and a total volume if filled with water to the brim of 102 km3. Adjusting the potential SLE for the ice volume below sea level and for the maximum potential storage of meltwater in these overdeepenings produces a maximum potential sea level rise (SLR) of 14.71 mm ± 2.94 mm. We provide a calculation of the present ice volume per major river catchment and we discuss likely changes to southern South America glaciers in the future. The ice thickness and subglacial topography modelled by this study will facilitate future studies of ice dynamics and glacier isostatic adjustment, and will be important for projecting water resources and glacier hazards. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84991713176&doi=10.1016%2fj.gloplacha.2016.09.010&partnerID=40&md5=503cb916143cf5835ae26ab267337c5a
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11609
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
There are no files associated with this item.
作者单位: School of Geography and water@leeds, University of Leeds, Woodhouse Lane, Leeds, West Yorkshire, United Kingdom
Recommended Citation:
Carrivick J.L.,Davies B.J.,James W.H.M.,et al. Distributed ice thickness and glacier volume in southern South America[J]. Global and Planetary Change,2016-01-01,146.