DOI: 10.5194/tc-7-249-2013
Scopus记录号: 2-s2.0-84873661807
论文题名: Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica
作者: Nitsche F ; O ; , Gohl K ; , Larter R ; D ; , Hillenbrand C ; -D ; , Kuhn G ; , Smith J ; A ; , Jacobs S ; , Anderson J ; B ; , Jakobsson M
刊名: Cryosphere
ISSN: 19940416
出版年: 2013
卷: 7, 期: 1 起始页码: 249
结束页码: 262
语种: 英语
英文关键词: basal area
; continental margin
; drainage network
; glacier dynamics
; ice flow
; ice sheet
; ice stream
; meltwater
; subglacial environment
; swath bathymetry
; Amundsen Sea
; Antarctica
; Marguerite Bay
; Pine Island Bay
; Southern Ocean
; West Antarctica
英文摘要: Increasing evidence for an elaborate subglacial drainage network underneath modern Antarctic ice sheets suggests that basal meltwater has an important influence on ice stream flow. Swath bathymetry surveys from previously glaciated continental margins display morphological features indicative of subglacial meltwater flow in inner shelf areas of some paleo ice stream troughs. Over the last few years several expeditions to the eastern Amundsen Sea embayment (West Antarctica) have investigated the paleo ice streams that extended from the Pine Island and Thwaites glaciers. A compilation of high-resolution swath bathymetry data from inner Pine Island Bay reveals details of a rough seabed topography including several deep channels that connect a series of basins. This complex basin and channel network is indicative of meltwater flow beneath the paleo-Pine Island and Thwaites ice streams, along with substantial subglacial water inflow from the east. This meltwater could have enhanced ice flow over the rough bedrock topography. Meltwater features diminish with the onset of linear features north of the basins. Similar features have previously been observed in several other areas, including the Dotson-Getz Trough (western Amundsen Sea embayment) and Marguerite Bay (SW Antarctic Peninsula), suggesting that these features may be widespread around the Antarctic margin and that subglacial meltwater drainage played a major role in past ice-sheet dynamics. © Author(s) 2013. CC Attribution 3.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75003
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: Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY, United States; Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany; British Antarctic Survey, Cambridge, United Kingdom; Department of Earth Sciences, Rice University, Houston, TX, United States; Department of Geological Sciences, Stockholm University, Stockholm, Sweden
Recommended Citation:
Nitsche F,O,, Gohl K,et al. Paleo ice flow and subglacial meltwater dynamics in Pine Island Bay, West Antarctica[J]. Cryosphere,2013-01-01,7(1)