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  • 1
    Online Resource
    Online Resource
    Atlas of submarine glacial landforms : modern, Quaternary and ancient / edited by J.A. Dowdeswell (University of Cambridge, UK), M. Canals (University of Barcelona, Spain), M. Jakobsson, Stockholm University, Sweden), B.J. Todd (Geological Survey of Canada, Canada), E.K. Dowdesweell (University of Cambridge, UK) and K.A. Hogan (British Antarctic Survey, UK) (2016)
    London : Geological Society
    Details Availability
    Keywords: Aufsatzsammlung ; Nordpolarmeer ; Glaziomarine Sedimentation ; Meeressediment ; Sedimentation ; Meeresboden ; Aufsatzsammlung ; Fjord ; Meeresgeologie ; Meeressediment ; Glaziomarines Sediment ; Erosion ; Antarktis ; Arktis ; Südpolarmeer ; Geomorphogenese ; Glazialerosion ; Glazialmorphologie ; Meeresgeologie ; Paläogeomorphologie
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource
    Series Statement: Geological Society Memoirs 46
    URL: http://mem.lyellcollection.org/content/46/1
    DOI: 10.1144/M46
    DDC: 551.31509168
    RVK:
    RY 20295
    Language: English
    Note: Dateiformat Volltext: PDF, abstracts
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  • 2
    Book
    Book
    Atlas of submarine glacial landforms: modern, Quaternary and ancient (2016)
    London : The Geological Society
    Details Availability
    Keywords: Glacial landforms ; Submarine topography ; Meeresboden ; Glaziallandschaft ; Glaziales Sediment
    Description / Table of Contents: "The Atlas presents over 180 contributions describing, illustrating and discussing the full variability of landforms found on the high-latitude glacier-influenced seafloor, from fjords and continental shelves to the continental slope, rise and deep-sea basins beyond."--
    Type of Medium: Book
    Pages: xix, 618 Seiten , Karten, Diagramme, Illustrationen , 32 cm
    ISBN: 9781786202680
    Series Statement: Geological Society memoir No. 46
    URL: http://mem.lyellcollection.org/content/46/1.toc
    DDC: 551.31509168
    RVK:
    RY 20295
    Language: English
    Note: Cumulated bibliography pages [575] - 611 , Geographical index pages [612] - 614 , Introduction -- Acoustic methods -- Fjords: landforms -- Fjords: landform assemblages -- Continental shelf: landforms -- Continental shelf: landform assemblages -- Continental slope: landforms -- Fjord-shelf-slope: landsystems -- Conclusion -- Glossary, cumulated bibliography and index
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  • 3
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    Seafloor geomorphology and glacimarine sedimentation associated with fast-flowing ice sheet outlet glaciers in Disko Bay, West Greenland (2017)
    Elsevier
    In:  Quaternary Science Reviews, 169 . pp. 206-230.
    Details
    Publication Date: 2020-02-06
    Description: Highlights • Glacial sediment-landform assemblages are documented from Disko Bay, West Greenland. • Jakobshavn Isbræ extended through the bay onto the continental shelf during the LGM. • Retreat was topographically controlled and changed from rapid to slow. • The depositional sedimentary environment was similar to East Greenland. • Glacimarine sedimentary processes depend on local controls rather than climate. Fast-flowing outlet glaciers currently drain the Greenland Ice Sheet (GIS), delivering ice, meltwater and debris to the fjords around Greenland. Although such glaciers strongly affect the ice sheet's mass balance, their glacimarine processes and associated products are still poorly understood. This study provides a detailed analysis of lithological and geophysical data from Disko Bay and the Vaigat Strait in central West Greenland. Disko Bay is strongly influenced by Jakobshavn Isbræ, Greenland's fastest-flowing glacier, which currently drains ∼7% of the ice sheet. Streamlined glacial landforms record the former flow of an expanded Jakobshavn Isbræ and adjacent GIS outlets through Disko Bay and the Vaigat Strait towards the continental shelf. Thirteen vibrocores contain a complex set of lithofacies including diamict, stratified mud, interbedded mud and sand, and bioturbated mud deposited by (1) suspension settling from meltwater plumes and the water column, (2) sediment gravity flows, and (3) iceberg rafting and ploughing. The importance of meltwater-related processes to glacimarine sedimentation in West Greenland fjords and bays is emphasised by the abundance of mud preserved in the cores. Radiocarbon dates constrain the position of the ice margin during deglaciation, and suggest that Jakobshavn Isbræ had retreated into central Disko Bay before 10.6 cal ka BP and to beyond Isfjeldsbanken by 7.6–7.1 cal ka BP. Sediment accumulation rates were up to 1.7 cm a−1 for ice-proximal glacimarine mud, and ∼0.007–0.05 cm a−1 for overlying distal sediments. In addition to elucidating the deglacial retreat history of Jakobshavn Isbræ, our findings show that the glacimarine sedimentary processes in West Greenland are similar to those in East Greenland, and that variability in such processes is more a function of time and glacier proximity than of geographic location and associated climatic regime.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.quascirev.2017.05.021
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Quaternary evolution of the northern North Sea margin through glacigenic debris-flow and contourite deposition (2017)
    Wiley
    In:  Journal of Quaternary Science .
    Details
    Publication Date: 2020-07-20
    Description: The Norwegian Channel Ice Stream of the Scandinavian Ice Sheet extended across the northern North Sea margin during the mid- to late Quaternary, eroding older sediment from the continental shelf. Consequently, little is known about early Quaternary sedimentation on this margin. We use two- and threedimensional seismic-reflection data to investigate changing sediment volumes and sources in the northern North Sea through the Quaternary. The northern North Sea Basin was infilled during the early Quaternary by intercalated glacigenic debris-flows and contourites, which provide a record of the delivery of glacigenic sediment to the slope and the intensity of North Atlantic thermohaline circulation during early Quaternary glacial ± interglacial cycles. The infilling of the basin reduced accommodation and led to the deflection of mid- to late Quaternary sediments into the Norwegian Sea, forming the North Sea Fan. Close to the onset of the mid-Quaternary, the south-western Scandinavian Ice Sheet margin was drained by an ice stream located beneath Målùy Plateau, 60 km east of the Last Glacial Maximum Norwegian Channel Ice Stream. The southward-flowing Norwegian Sea Bottom Water current was directed into the partially filled northern North Sea Basin during the early Quaternary, and deflected progressively northwards as the basin became infilled.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1002/jqs.2934
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  • 5
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    BedMachine v3: Complete bed topography and ocean bathymetry mapping of Greenland from multi-beam echo sounding combined with mass conservation (2017)
    Wiley
    In:  EPIC3Geophysical Research Letters, Wiley, 44(21), pp. 11051-11061
    Details
    Publication Date: 2017-12-01
    Description: Greenland's bed topography is a primary control on ice flow, grounding line migration, calving dynamics and subglacial drainage. Moreover, fjord bathymetry regulates the penetration of warm Atlantic Water (AW) that rapidly melts and undercuts Greenland's marine-terminating glaciers. Here, we present a new compilation of Greenland bed topography that assimilates seafloor bathymetry and ice thickness data through a mass conservation (MC) approach. A new 150-m horizontal resolution bed topography/bathymetric map of Greenland is constructed with seamless transitions at the ice/ocean interface, yielding major improvements over previous datasets, particularly in the marine-terminating sectors of northwest and southeast Greenland. Our map reveals the total sea level potential of the Greenland Ice Sheet is 7.42±0.05 m, which is 7 cm greater than previous estimates. Furthermore, it explains recent calving front response of numerous outlet glaciers and reveals new pathways by which AW can access glaciers with marine-based basins, thereby highlighting sectors of Greenland that are most vulnerable to future oceanic forcing.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 6
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    Anvers-Hugo Trough palaeo-ice stream, Antarctic Peninsula: geomorphological evidence for the role of subglacial water in facilitating ice stream flow (2017)
    SCAR
    In:  EPIC3Past Antarctic Ice Sheet Dynamics (PAIS) Conference, Trieste, 2017-09-10-2017-09-15SCAR
    Details
    Publication Date: 2018-08-10
    Description: We will present new multibeam bathymetry data that make the Anvers-Hugo Trough west of the Antarctic Peninsula one of the most completely surveyed palaeo-ice stream pathways in Antarctica. We interpret landforms revealed by these data as indicating that subglacial water availability played an important role in facilitating ice stream flow in the trough during late Quaternary glacial periods. Specifically, we observe a set of northward-shoaling valleys that are eroded into the upstream edge of a sedimentary basin, extend northwards from a zone containing landforms typical of erosion by subglacial water flow, and coincide spatially with the onset of mega-scale glacial lineations. Water was likely supplied to the ice stream bed episodically as a result of outbursts from a subglacial lake previously hypothesized to have been located in the Palmer Deep basin on the inner continental shelf. In a palaeo-ice stream confluence area, close juxtaposition of mega-scale glacial lineations with landforms that are characteristic of slow, dry-based ice flow, suggests that water availability was also an important control on the lateral extent of these palaeo-ice streams. These interpretations are consistent with the hypothesis that subglacial lakes or areas of elevated geothermal heat flux play a critical role in the onset of many large ice streams. The interpretations also have implications for the dynamic behaviour of the Anvers-Hugo Trough palaeo-ice stream and, potentially, of several other Antarctic palaeo-ice streams. Keywords: multibeam bathymetry, ice stream, subglacial water, landform
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
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  • 7
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    Is breaking up hard to do? Clues from the sea bed (2018)
    In:  EPIC325th Annual WAIS Workshop, Stony Point, NY, USA, 2018-09-16-2018-09-19
    Details
    Publication Date: 2018-08-12
    Description: Iceberg calving accounts for between one third and a half of the mass loss from Thwaites Glacier and Pine Island Glacier ice shelves. If increased calving results in ice-shelf retreat or break up, the loss of buttressing can be expected to lead to further flow acceleration and dynamic thinning of the glaciers. It has been suggested that if ice-shelf breakup exposes a floating terminus exceeding a critical thickness of ~1000 m, this will be structurally unstable and rapid retreat through Marine Ice Cliff Instability (MICI) could be initiated. Despite their importance, the factors controlling calving remain poorly understood. Two recent studies show how sea-bed topography can influence calving. Prior to 2015, despite rapid thinning for more than 20 years, the position from which large tabular icebergs calved from Pine Island Glacier had varied little since its ice shelf was first observed in 1947. In August 2015 calving occurred at a position ~15 km further upstream than on any previous occasion and the new calving front had a different orientation from previous ones. The area that the ice shelf retreated from at this time encompassed a former pinning point. Multibeam bathymetry data were collected over this area on RV Polarstern expedition PS104 in 2017. Consideration of a series of satellite images from 2002 to 2017 in the context of the detailed new bathymetry data suggests that calving events in 2007 and 2013 were triggered by interactions between the ice shelf and bathymetric highs (Arndt et al., 2018). Further offshore, an unusual episode of calving during the last deglaciation of the continental shelf is recorded by iceberg-keel plough marks in Pine Island Trough that are identified in multibeam bathymetry data collected on icebreaker Oden expedition OSO0910 in 2010. The relatively small size (width 〈450 m) and great depth (up to 848 m) of these plough marks, together with the fact that they formed during a short period of rapid retreat constrained by radiocarbon dates on foraminifera from sediment cores, were interpreted by Wise et al. (2017) as evidence of an episode of MICI during retreat of a merged Pine Island and Thwaites ice steam into Pine Island Bay.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 8
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    A new bathymetry of the Northeast Greenland continental shelf: Constraints on glacial and other processes (2015)
    AGU
    In:  EPIC3Geochemistry, Geophysics, Geosystems, AGU, 16(10), pp. 3733-3753
    Details
    Publication Date: 2015-12-14
    Description: A new digital bathymetric model (DBM) for the Northeast Greenland (NEG) continental shelf (74°N–81°N) is presented. The DBM has a grid cell size of 250 m × 250 m and incorporates bathymetric data from 30 multibeam cruises, more than 20 single-beam cruises and first reflector depths from industrial seismic lines. The new DBM substantially improves the bathymetry compared to older models. The DBM not only allows a better delineation of previously known seafloor morphology but, in addition, reveals the presence of previously unmapped morphological features including glacially derived troughs, fjords, grounding-zone wedges, and lateral moraines. These submarine landforms are used to infer the past extent and ice-flow dynamics of the Greenland Ice Sheet during the last full-glacial period of the Quaternary and subsequent ice retreat across the continental shelf. The DBM reveals cross-shelf bathymetric troughs that may enable the inflow of warm Atlantic water masses across the shelf, driving enhanced basal melting of the marine-terminating outlet glaciers draining the ice sheet to the coast in Northeast Greenland. Knolls, sinks, and hummocky seafloor on the middle shelf are also suggested to be related to salt diapirism. North-south-orientated elongate depressions are identified that probably relate to ice-marginal processes in combination with erosion caused by the East Greenland Current. A single guyot-like peak has been discovered and is interpreted to have been produced during a volcanic event approximately 55 Ma ago.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 9
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    Northeast Greenland - Digital Bathymetric Compilation, with links to DBM in ArcGIS format (2015)
    PANGAEA
    In:  Supplement to: Arndt, Jan Erik; Jokat, Wilfried; Dorschel, Boris; Myklebust, Reidun; Dowdeswell, Julian A; Evans, Jeffrey (2015): A new bathymetry of the Northeast Greenland continental shelf: Constraints on glacial and other processes. Geochemistry, Geophysics, Geosystems, 16(10), 3733-3753, https://doi.org/10.1002/2015GC005931
    Details
    Publication Date: 2023-01-20
    Description: A new digital bathymetric model (DBM) for the Northeast Greenland (NEG) continental shelf (74°N - 81°N) is presented. The DBM has a grid cell size of 250 m × 250 m and incorporates bathymetric data from 30 multibeam cruises, more than 20 single-beam cruises and first reflector depths from industrial seismic lines. The new DBM substantially improves the bathymetry compared to older models. The DBM not only allows a better delineation of previously known seafloor morphology but, in addition, reveals the presence of previously unmapped morphological features including glacially derived troughs, fjords, grounding-zone wedges, and lateral moraines. These submarine landforms are used to infer the past extent and ice-flow dynamics of the Greenland Ice Sheet during the last full-glacial period of the Quaternary and subsequent ice retreat across the continental shelf. The DBM reveals cross-shelf bathymetric troughs that may enable the inflow of warm Atlantic water masses across the shelf, driving enhanced basal melting of the marine-terminating outlet glaciers draining the ice sheet to the coast in Northeast Greenland. Knolls, sinks, and hummocky seafloor on the middle shelf are also suggested to be related to salt diapirism. North-south-orientated elongate depressions are identified that probably relate to ice-marginal processes in combination with erosion caused by the East Greenland Current. A single guyot-like peak has been discovered and is interpreted to have been produced during a volcanic event approximately 55 Ma ago.
    Keywords: File content; NEG_DBM; Northeast Greenland; Projection; Resolution; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
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