globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2016.09.003
Scopus记录号: 2-s2.0-84988484719
论文题名:
Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea
作者: Piasecka E.D.; Winsborrow M.C.M.; Andreassen K.; Stokes C.R.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2016
卷: 151
起始页码: 212
结束页码: 227
语种: 英语
英文关键词: Barents Sea Ice Sheet ; Bjørnøyrenna Ice Stream ; Deglaciation ; Last Glacial Maximum ; Mega-scale glacial lineations
Scopus关键词: Dynamics ; Glacial geology ; Glaciers ; Sea ice ; Seismic response ; Seismic waves ; Seismology ; Deglaciations ; Glacial lineation ; Ice sheet ; Ice streams ; Last Glacial Maximum ; Ice ; atmosphere-ocean system ; deglaciation ; glacier dynamics ; ice flow ; ice retreat ; ice sheet ; ice stream ; Last Glacial Maximum ; reconstruction ; sea ice ; seafloor ; seismic data ; Arctic Ocean ; Barents Sea ; Bjornoyrenna
英文摘要: The stability of contemporary ice sheets is influenced by the discharge from ice streams - corridors of fast-flowing ice bounded by ice flowing an order of magnitude slower. Reconstructions of palaeo-ice stream dynamics contribute to our understanding of ice stream sensitivity to the ocean-climate system and can aid in the numerical modelling and prediction of future changes in contemporary ice sheets. Here we use 3D seismic data, covering 13,000 km2 in the central Bjørnøyrenna (Bear Island Trough), Barents Sea, to investigate the record of ice streaming preserved on the seafloor and on a buried palaeo-seafloor surface. The unusually broad coverage and high resolution of the dataset, as well as its location in the central area of the trough, enables improved reconstruction of dynamics of the former Bjørnøyrenna Ice Stream in terms of number of streaming events, their trajectory, and their relative age sequence during deglaciation. Our results reveal major changes in the configuration and flow dynamics of the ice stream, with up to 10 flow-switching events identified. For the first time, we also document ice streaming sourced from the eastern Barents Sea around the time of the LGM. This high degree of flow variability is suggested to have resulted from climate-driven changes in ice sheet geometry (and ice divide migration), and variations in topography that influenced calving at the ice stream terminus. © 2016 Elsevier Ltd
资助项目: This work is a contribution to “Glaciated North Atlantic Margins” (GLANAM) Initial Training Network funded by the European Community's 7th Framework Programme (317217) FP7 2007/2013, Marie-Curie Actions, under Grant Agreement No. 317217. It is also a part of ”CAGE” – “the Centre for Arctic Gas Hydrate, Environment and Climate”, supported by the Research Council of Norway through its Centres of Excellence funding scheme grant No. 223259. The 3D seismic datasets were kindly provided by Statoil ASA and TGS Norway. We thank the Editor and an anonymous reviewer for their comments during the peer review process.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59417
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作者单位: CAGE, Centre for Arctic Gas Hydrates, Environment and Climate, Department of Geology, UiT The Arctic University of Norway, Norway; Department of Geography, Durham University, United Kingdom

Recommended Citation:
Piasecka E.D.,Winsborrow M.C.M.,Andreassen K.,et al. Reconstructing the retreat dynamics of the Bjørnøyrenna Ice Stream based on new 3D seismic data from the central Barents Sea[J]. Quaternary Science Reviews,2016-01-01,151
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