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  • 1
    Online Resource
    Online Resource
    Newark :John Wiley & Sons, Incorporated,
    Keywords: Glacial landforms -- Congresses. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (436 pages)
    Edition: 1st ed.
    ISBN: 9781444304442
    Series Statement: International Association of Sedimentologists Series ; v.23
    DDC: 551.31/5
    Language: English
    Note: Intro -- Preface -- Foreword -- Introduction to Papers -- Part 1 Glacier dynamics and sedimentation -- Hydrological connections between Antarctic subglacial lakes, the flow of water beneath the East Antarctic Ice Sheet and implications for sedimentary processes -- Sedimentology, structural characteristics and morphology of a Neoglacial high-Arctic moraine-mound complex: Midre Lovenbreen, Svalbard -- A new laboratory apparatus for investigating clast ploughing -- Part 2 Modelling glaciers and ice sheets -- A coupled ice-sheet/ice-shelf/sediment model applied to a marine-margin flowline: forced and unforced variations -- A brief review on modelling sediment erosion, transport and deposition by former large ice sheets -- Part 3 Quaternary glacial systems -- Glaciomarine sediment drifts from Gerlache Strait, Antarctic Peninsula -- Sedimentary signatures of the Waterloo Moraine, Ontario, Canada -- Estimating episodic permafrost development in northern Germany during the Pleistocene -- Lake-level control on ice-margin subaqueous fans, glacial Lake Rinteln, Northwest Germany -- Seasonal controls on deposition of Late Devensian Glaciolacustrine Sediments, Central Ireland -- Anatomy and facies association of a drumlin in Co. Down, Northern Ireland, from seismic and electrical resistivity surveys -- The Newbigging esker system, Lanarkshire, Southern Scotland: a model for composite tunnel, subaqueous fan and supraglacial esker sedimentation -- The age and origin of the Blakeney esker of north Norfolk: implications for the glaciology of the southern North Sea Basin -- Sediments and landforms in an upland glaciated-valley landsystem: upper Ennerdale, English Lake District -- Part 4 Pre-Quaternary glacial systems -- Cenozoic climate and sea level history from glacimarine strata off the Victoria Land coast, Cape Roberts Project, Antarctica. , Glacial stress field orientation reconstructed through micromorphology and m X-ray computed tomography of till -- The Late Ordovician glacial sedimentary system of the North Gondwana platform -- The Ordovician glaciation in Eritrea and Ethiopia, NE Africa -- Neoproterozoic glaciated basins: a critical review of the Snowball Earth hypothesis by comparison with Phanerozoic glaciations -- Index.
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  • 2
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    Unknown
    PANGAEA
    In:  Supplement to: Hofstede, Coen Matthijs; Christoffersen, Poul; Hubbard, Bryn; Doyle, Samuel H; Young, Tun Jan; Diez, Anja; Eisen, Olaf; Hubbard, Alun L (2018): Physical Conditions of Fast Glacier Flow: 2. Variable Extent of Anisotropic Ice and Soft Basal Sediment From Seismic Reflection Data Acquired on Store Glacier, West Greenland. Journal of Geophysical Research-Earth Surface, 123(2), 349-362, https://doi.org/10.1002/2017JF004297
    Publication Date: 2023-03-16
    Description: Added are 5 seismic reflection data sets of Store Glacier, a tide water glacier in West Greenland Uummannaq Fjord. Two crossing profiles were recorded, 20140513, along the ice flow and 20140514, across the ice flow.
    Keywords: AWI_Glac; File content; File format; File name; File size; Glaciology @ AWI; Seismic reflection profile; SEISREFL; Store_Glacier; Uniform resource locator/link to file; West Greenland
    Type: Dataset
    Format: text/tab-separated-values, 25 data points
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  • 3
    Publication Date: 2023-05-12
    Keywords: Comment; DGPS; Differential global positioning system (DGPS); ELEVATION; Error; Event label; ICEM; Ice measurement; International Polar Year 2007-2008; IPY-4; Latitude of event; Longitude of event; Nordaustlandet, Svalbard; Range; Ratio; Station label; Time coverage; UTM Easting, Universal Transverse Mercator; UTM Northing, Universal Transverse Mercator; UTM Zone, Universal Transverse Mercator; Velocity magnitude; Vestfonna_PM1; Vestfonna_PM10; Vestfonna_PM11; Vestfonna_PM12; Vestfonna_PM13; Vestfonna_PM14; Vestfonna_PM15; Vestfonna_PM16; Vestfonna_PM17; Vestfonna_PM18; Vestfonna_PM19; Vestfonna_PM2; Vestfonna_PM20; Vestfonna_PM21; Vestfonna_PM22; Vestfonna_PM23; Vestfonna_PM3; Vestfonna_PM4; Vestfonna_PM5; Vestfonna_PM6; Vestfonna_PM7; Vestfonna_PM8; Vestfonna_PM9
    Type: Dataset
    Format: text/tab-separated-values, 200 data points
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  • 4
    Publication Date: 2023-05-12
    Keywords: Comment; DGPS; Difference; Differential global positioning system (DGPS); ELEVATION; Event label; ICEM; Ice measurement; InSAR 1995/96 (Tandem Phase ERS-1/2 SAR); InSAR 2008 (ALOS PALSAR); International Polar Year 2007-2008; IPY-4; Latitude of event; Longitude of event; Nordaustlandet, Svalbard; Station label; Velocity magnitude; Vestfonna_PM1; Vestfonna_PM10; Vestfonna_PM11; Vestfonna_PM12; Vestfonna_PM13; Vestfonna_PM14; Vestfonna_PM15; Vestfonna_PM16; Vestfonna_PM17; Vestfonna_PM18; Vestfonna_PM19; Vestfonna_PM2; Vestfonna_PM20; Vestfonna_PM21; Vestfonna_PM22; Vestfonna_PM23; Vestfonna_PM3; Vestfonna_PM4; Vestfonna_PM5; Vestfonna_PM6; Vestfonna_PM7; Vestfonna_PM8; Vestfonna_PM9
    Type: Dataset
    Format: text/tab-separated-values, 159 data points
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  • 5
    Publication Date: 2023-05-12
    Keywords: Days, cumulated; ELEVATION; Event label; ICEM; Ice measurement; International Polar Year 2007-2008; IPY-4; Latitude of event; Longitude of event; Nordaustlandet, Svalbard; Ratio; Season; Station label; Velocity magnitude; Vestfonna_PM18; Vestfonna_PM19; Vestfonna_PM20; Vestfonna_PM21; Vestfonna_PM22; Vestfonna_PM23
    Type: Dataset
    Format: text/tab-separated-values, 54 data points
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  • 6
    facet.materialart.
    Unknown
    PANGAEA
    In:  Supplement to: Pohjola, Veijo A; Christoffersen, Poul; Kolondra, Leszek; Moore, John C; Pettersson, Rickard; Schäfer, Martina; Strozzi, Tazio; Reijmer, Carleen H (2011): Spatial distribution and change in the surface ice-velocity field of Vestfonna ice cap, Nordaustlandet, Svalbard, 1995-2010 using geodetic and satellite interferometry data. Geografiska Annaler Series A-Physical Geography, 93(4), 323-335, https://doi.org/10.1111/j.1468-0459.2011.00441.x
    Publication Date: 2023-12-13
    Description: During 2007 we launched a geodetic campaign on the Svalbard ice cap Vestfonna in order to estimate the velocity field of the ice cap. This was done within the frame of the IPY project KINNVIKA. We present here the velocity measurements derived from our campaigns 2007-2010 and compare the geodetic measurements against InSAR velocity fields from satellite platforms from 1995/96 and 2008. We find the spatial distribution of ice speeds from the InSAR is in good agreement within the uncertainty limits with our geodetic measurements. We observe no clear indication of seasonal ice speed differences, but we find a speed-up of the outlet glacier Franklinbreen between the InSAR campaigns, and speculate the outlet is having a surge phase.
    Keywords: International Polar Year (2007-2008); IPY
    Type: Dataset
    Format: application/zip, 3 datasets
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  • 7
    Publication Date: 2019-08-21
    Description: As part of the research project RESPONDER, we performed two combined radar-seismic surveys to identify the bed conditions and suitable drilling locations at Store Glacier, a marine-terminating glacier in West Greenland. The two sites at 30 (Low Site) and 60 km (High Site) upstream of the snout of the glacier are thought to be part of the same subglacial drainage system but have different conditions both at the surface and at the base. As the ice-bed contact in the seismic data was sometimes difficult to identify we used the radar (Ground Penetrating Radar) data for confirmation. At the Low Site in the ablation zone, the surface is icy and crevassed. The five 2 to 3 km long seismic profiles show a large subglacial trench (width 2 km, depth 350 m) orientated in flow direction. The basal conditions vary with patches water, whether or not present in saturated sediments or exclusively at the base, both at the along-flow and across-flow profiles but they appear mainly at the sloping sides of the trench. The NE side of the trench contains a 100 to 150 m thick stratified sequence of softer, less consolidated sediments. At the High Site at equilibrium line, the surface is snowy with two frozen supra-glacial lakes. The two seismic profiles show less topography but have a similar patchy character. Despite thicker ice the ice-bed contact is much clearer visible in the seismic data which we contribute to a better coupled snowstreamer. The 5 km along-flowprofile has a flat base consisting of sediments. A clear single englacial reflection following the shape of the base can be seen at 85% depth of the ice column, possibly the Holocene-Wisconsin transition. At the 1.7 km across-flow profile there is a 130 m rise of the bed from S to N. Judging by the strength of the basal reflection the sediments at the northern side are softer then at the southern side.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
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  • 8
    Publication Date: 2018-04-03
    Description: Marine-terminating outlet glaciers of the Greenland ice sheet make significant contributions to global sea level rise, yet the conditions that facilitate their fast flow remain poorly constrained owing to a paucity of data. We drilled and instrumented seven boreholes on Store Glacier, Greenland, to monitor subglacial water pressure, temperature, electrical conductivity and turbidity along with englacial ice temperature and deformation. These observations were supplemented by surface velocity and meteorological measurements to gain insight into the conditions and mechanisms of fast glacier flow. Located 30km from the calving front, each borehole drained rapidly on attaining ∼600m depth indicating a direct connection with an active subglacial hydrological system. Persistently high subglacial water pressures indicate low effective pressure (180 − 280 kPa), with small amplitude variations correlated with notable peaks in surface velocity driven by the diurnal melt cycle and longer periods of melt and rainfall. The englacial deformation profile determined from borehole tilt measurements indicates that 63-71% of total ice motion occurred at the bed, with the remaining 29-37% predominantly attributed to enhanced deformation in the lowermost 50-100 m of the ice column. We interpret this lowermost 100m to be formed of warmer, pre-Holocene ice overlying a thin (0 − 8 m) layer of temperate basal ice. Our observations are consistent with a spatially-extensive and persistently-inefficient subglacial drainage system that we hypothesize comprises drainage both at the ice-sediment interface and through subglacial sediments. This configuration has similarities to that interpreted beneath dynamically-analogous Antarctic ice streams, Alaskan tidewater glaciers, and glaciers in surge.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 9
    Publication Date: 2015-11-05
    Description: Intense rainfall events significantly affect Alpine and Alaskan glaciers through enhanced melting, ice-flow acceleration and subglacial sediment erosion, yet their impact on the Greenland ice sheet has not been assessed. Here we present measurements of ice velocity, subglacial water pressure and meteorological variables from the western margin of the Greenland ice sheet during a week of warm, wet cyclonic weather in late August and early September 2011. We find that extreme surface runoff from melt and rainfall led to a widespread acceleration in ice flow that extended 140 km into the ice-sheet interior. We suggest that the late-season timing was critical in promoting rapid runoff across an extensive bare ice surface that overwhelmed a subglacial hydrological system in transition to a less-efficient winter mode. Reanalysis data reveal that similar cyclonic weather conditions prevailed across southern and western Greenland during this time, and we observe a corresponding ice-flow response at all land- and marine-terminating glaciers in these regions for which data are available. Given that the advection of warm, moist air masses and rainfall over Greenland is expected to become more frequent in the coming decades, our findings portend a previously unforeseen vulnerability of the Greenland ice sheet to climate change.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
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  • 10
    Publication Date: 2016-01-11
    Description: Basal conditions have a profound influence on the dynamics of outlet glaciers. As part of the SAFIRE research programme, we carried out a seismic survey on Store Glacier, a tidewater glacier terminating in Uummanaq Fjord in West Greenland (see joint abstracts by Christoffersen et al. and Doyle et al. for details). At the survey site the ice moves 700m/a making the terrain crevassed and bumpy. Despite the rough terrain we collected two 1.5 km long survey lines parallel and perpendicular to the ice flow irection using a 300m snow streamer and explosives as a source. The seismic data reveal an ice thickness of about 620m and 20 to 30m of subglacial sediment on the upstream side of the area thinning in the downstream direction. From polarity reversals seen along the ice bed contact we speculate that the sediments have varying degrees of water content. The ice itself has several englacial reflections parallel and close to the bed. At approximately 475m depth, a clear single englacial reflection is observed in the parallel survey line. Thermistor data installed at this location show a clear increase in ice temperature starting at this depth. We speculate that the observed englacial reflection is caused by a change in crystal orientation fabric allowing greater ice deformation below this depth causing increased strain heating.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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