DOI: 10.1016/j.quascirev.2013.11.021
Scopus记录号: 2-s2.0-84891352329
论文题名: Meltwater intensive glacial retreat in polar environments and investigation of associated sediments: Example from Pine Island Bay, West Antarctica
作者: Witus A.E. ; Branecky C.M. ; Anderson J.B. ; Szczuciński W. ; Schroeder D.M. ; Blankenship D.D. ; Jakobsson M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2014
卷: 85 起始页码: 99
结束页码: 118
语种: 英语
英文关键词: Glacial sedimentology
; Pine Island Bay
; Plumite
; Subglacial drainage
; Subglacial meltwater
Scopus关键词: Glacial sedimentologies
; Glacimarine sediment
; Hydraulic potential
; Pine Island Bay
; Plumite
; Polar environments
; Sediment-laden water
; Subglacial meltwater
; Deposits
; Glacial geology
; Sedimentology
; Sediments
; cryosphere
; deposition
; glacial hydrology
; ice sheet
; meltwater
; polar region
; Antarctica
; Pine Island Bay
; West Antarctica
英文摘要: Modern Pine Island and Thwaites Glaciers, which both drain into Pine Island Bay, are among the fastest changing portions of the cryosphere and the least stable ice streams in Antarctica. Here we show that the uppermost sediment unit in Pine Island Bay was deposited from a meltwater plume, a plumite, during the late stages of ice sheet retreat ~7-8.6kcalyrBP and argue that this deposit records episodes of meltwater intensive sedimentation.The plumite is a hydraulically sorted, glacially sourced, draping deposit that overlies proximal glacimarine sediments and thickens towards the modern grounding line. The uppermost sediment unit is interpreted as a product of non-steady-state processes in which low background sedimentation in large bedrock-carved basins alternates with episodic purging of sediment-laden water from these basins. The inner part of Pine Island Bay contains several basins that are linked by channels with a storage capacity on the order of 70km3 of stagnant water and significant sediment storage capacity. Purging of these basins is caused by changes in hydraulic potential and glacial reorganization. The sediment mobilized by these processes is found here to total 120km3.This study demonstrates that episodes of meltwater-intensive sedimentation in Pine Island Bay occurred at least three times in the Holocene. The most recent episode coincides with rapid retreat of the grounding line in historical time and has an order of magnitude greater flux relative to the entire unit. We note that the final phase of ice stream retreat in Marguerite Bay was marked by a similar sedimentary event and suggest that the modern Thwaites Glacier is poised for an analogous meltwater-intensive phase of retreat. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60392
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Earth Sciences, Rice University, 6100 Main Street, Houston, TX 77005, United States; Institute of Geology, Adam Mickiewicz University, Maków Polnych 16, 61-606 Poznań, Poland; Institute of Geophysics, University of Texas, Austin, TX, United States; Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Recommended Citation:
Witus A.E.,Branecky C.M.,Anderson J.B.,et al. Meltwater intensive glacial retreat in polar environments and investigation of associated sediments: Example from Pine Island Bay, West Antarctica[J]. Quaternary Science Reviews,2014-01-01,85