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  • 1
    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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  • 2
    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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  • 3
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    (Table 2) AMS radiocarbon dates from sediment cores obtained during James Clark Ross cruise JR142, Kvitøya Trough (2010)
    PANGAEA
    In:  Supplement to: Hogan, Kelly A; Dowdeswell, Julian A; Noormets, R; Evans, Jeffrey; Ó Cofaigh, Colm; Jakobsson, Martin (2010): Submarine landforms and ice-sheet flow in the Kvitøya Trough, northwestern Barents Sea. Quaternary Science Reviews, 29(25-26), 3545-3562, https://doi.org/10.1016/j.quascirev.2010.08.015
    Details
    Publication Date: 2023-12-13
    Description: High-resolution geophysical and sediment core data are used to investigate the pattern and dynamics of former ice flow in Kvitøya Trough, northwestern Barents Sea. A new swath-bathymetric dataset identifies three types of submarine landform in the study area (streamlined landforms, meltwater channels and cavities, iceberg scours). Subglacially produced streamlined landforms provide a record of ice flow through Kvitøya Trough during the last glaciation. Flow directions are inferred from the orientations of streamlined landforms (drumlins, crag-and-tail features). Ice flowed northward for at least 135 km from an ice divide at the southern end of Kvitøya Trough. A large channel-cavity system incised into bedrock in the southern trough indicates that subglacial meltwater was present at the former ice-sheet base. Modest landform elongation ratios and a lack of mega-scale glacial lineations suggest that, although ice in Kvitøya Trough was melting at the bed and flowed faster than the likely thin and cold-based ice on adjacent banks, a major ice stream probably did not occupy the trough. Retreat was relatively rapid after 14-13.5 14C kyr B.P. and probably progressed via ice sheet-bed decoupling in response to rising sea level. There is little evidence for still stands during ice retreat or of ice-proximal deglacial sediments. Relict iceberg scours in present-day water depths of more than 350 m in the northern trough indicate that calving was an important mass loss mechanism during retreat.
    Keywords: Age, 14C AMS; Age, dated; Age, dated material; Age, dated standard deviation; Core; DEPTH, sediment/rock; Event label; GC; Gravity corer; International Polar Year (2007-2008); IPY; James Clark Ross; JR142; JR142-GC10; JR142-GC11; JR20060728; Latitude of event; Longitude of event; Svalbard Shelf
    Type: Dataset
    Format: text/tab-separated-values, 12 data points
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  • 4
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    The International Bathymetric Chart of the Southern Ocean Version 2 (IBCSO v2) (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: The International Bathymetric Chart of the Southern Ocean Version 2 (IBCSO v2) is a digital bathymetric model (DBM) for the area south of 50° S with special emphasis on the bathymetry of the Southern Ocean. IBCSO v2 has a resolution of 500 m × 500 m in a Polar Stereographic projection (EPSG: 9354). The total data coverage of the seafloor is 23.79% with a multibeam-only data coverage of 22.32%. The remaining 1.47% include singlebeam and other data. IBCSO v2 is the most authoritative seafloor map of the area south of 50°S. IBCSO is a regional mapping project of the General Bathymetric Chart of the Ocean (GEBCO) supported by the Nippon Foundation – GEBCO Seabed 2030 Project. GEBCO is a project under the auspices of the International Hydrographic Organization (IHO) and the Intergovernmental Oceanographic Commission (IOC) with the goal to produce the authoritative map of the world's oceans. The IBCSO Project is also an integral part of the Antarctic research community and an expert group of the Scientific Committee on Antarctic Research (SCAR). For further information about the IBCSO Project, please visit http://www.ibcso.org.
    Keywords: Antarctica; AWI_GeoPhy; Binary Object; Binary Object (File Size); Description; IBCSO_v2_extent; Image; Image (File Size); Marine Geophysics @ AWI; Projection; Seabed2030; The Nippon Foundation - GEBCO Seabed 2030 Project
    Type: Dataset
    Format: text/tab-separated-values, 50 data points
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    DATA PANGAEA
  • 5
    Electronic Resource
    Electronic Resource
    Parallel increases in lipid and protein oxidative markers in several mouse brain regions after methamphetamine treatment (2001)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 79 (2001), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The neurotoxic actions of methamphetamine (METH) may be mediated in part by reactive oxygen species (ROS). Methamphetamine administration leads to increases in ROS formation and lipid peroxidation in rodent brain; however, the extent to which proteins may be modified or whether affected brain regions exhibit similar elevations of lipid and protein oxidative markers have not been investigated. In this study we measured concentrations of TBARs, protein carbonyls and monoamines in various mouse brain regions at 4 h and 24 h after the last of four injections of METH (10 mg/kg/injection q 2 h). Substantial increases in TBARs and protein carbonyls were observed in the striatum and hippocampus but not the frontal cortex nor the cerebellum of METH-treated mice. Furthermore, lipid and protein oxidative markers were highly correlated within each brain region. In the hippocampus and striatum elevations in oxidative markers were significantly greater at 24 h than at 4 h. Monoamine levels were maximally reduced within 4 h (striatal dopamine [DA] by 95% and serotonin [5-HT] in striatum, cortex and hippocampus by 60–90%). These decrements persisted for 7 days after METH, indicating effects reflective of nerve terminal damage. Interestingly, NE was only transiently depleted in the brain regions investigated (hippocampus and cortex), suggesting a pharmacological and non-toxic action of METH on the noradrenergic nerve terminals. This study provides the first evidence for concurrent formation of lipid and protein markers of oxidative stress in several brain regions of mice that are severely affected by large neurotoxic doses of METH. Moreover, the differential time course for monoamine depletion and the elevations in oxidative markers indicate that the source of oxidative stress is not derived directly from DA or 5HT oxidation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.2001.00549.x
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  • 6
    Electronic Resource
    Electronic Resource
    Analysis of VMAT2 Binding After Methamphetamine or MPTP Treatment (2000)
    Oxford UK : Blackwell Science Ltd.
    Journal of neurochemistry 74 (2000), S. 0 
    Details
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: [3H]Dihydrotetrabenazine ([3H]DTBZ), a specific ligand for the vesicular monoamine transporter (VMAT2), has been used to characterize the integrity of monoaminergic nerve terminals in experimental animals and humans. The purpose of the present studies was to compare the loss of VMAT2 binding with the loss of other neurochemical markers of the dopamine (DA) nerve terminals in mice treated with neurotoxic doses of methamphetamine (METH) or MPTP. Profound decreases (≥70%) in DA content, tyrosine hydroxylase activity, and [3H]carbomethoxy-3-(4-fluorophenyl)tropane binding to the DA transporter were observed in striatal homogenates at both 1 and 6 days after exposure to the neurotoxins. It is surprising that no significant loss of [3H]DTBZ binding in the homogenates was observed at 1 day after exposure, although a significant loss (-50%) was apparent 6 days later. However, in isolated vesicle preparations, [3H]DTBZ binding and active [3H]DA uptake were markedly reduced (〉70%) at 1 day. These observations indicate that vesicle function is compromised at an early time point after exposure to neurotoxic insult. Furthermore, the changes in [3H]DTBZ binding in homogenates may not be a sensitive indicator of early damage to synaptic vesicles, although homogenate binding reliably identifies a loss of VMAT2 at later times.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1471-4159.2000.0742217.x
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  • 7
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    Morphometry of bedrock meltwater channels on Antarctic inner continental shelves: Implications for channel development and subglacial hydrology (2020)
    ELSEVIER SCIENCE BV
    In:  EPIC3Geomorphology, ELSEVIER SCIENCE BV, ISSN: 0169-555X
    Details
    Publication Date: 2020-09-02
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
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    History of Anvers-Hugo Trough, western Antarctic Peninsula shelf, since the Last Glacial Maximum. Part I: Deglacial history based on new sedimentological and chronological data (2022)
    In:  EPIC3Quaternary Science Reviews, 291, pp. 107590, ISSN: 02773791
    Details
    Publication Date: 2022-10-14
    Description: Reconstructing the advance and retreat of past ice sheets provides important long-term context for recent change(s) and enables us to better understand ice sheet responses to forcing mechanisms and external boundary conditions that regulate grounding line retreat. This study applies various radiocarbon dating techniques, guided by a detailed sedimentological analyses, to reconstruct the glacial history of Anvers-Hugo Trough (AHT), one of the largest bathymetric troughs on the western Antarctic Peninsula (WAP) shelf. Existing records from AHT indicate that the expanded Antarctic Peninsula Ice Sheet (APIS) advanced to, or close to, the continental shelf edge during the Last Glacial Maximum (LGM; 23-19 cal kyr BP [ = calibrated kiloyears before present]), with deglaciation of the outer shelf after ∼16.3 cal kyr BP. Our new chronological data show that the APIS had retreated to the middle shelf by ∼15.7 cal kyr BP. Over this 600-year interval, two large grounding-zone wedges (GZW) were deposited across the middle (GZW2) and inner shelf (GZW3), suggesting that their formation occurred on centennial rather than millennial timescales. Expanded sequences of sub-ice shelf sediments occur seaward of the inner GZW3, which suggests that the grounding line remained stationary for a prolonged period over the middle shelf. Grounding-line retreat rates indicate faster retreat across the outer to middle shelf compared to retreat across the middle to inner shelf. We suggest that variable retreat rates relate to the broad-scale morphology of the trough, which is characterised by a relatively smooth, retrograde seabed on the outer to middle shelf and rugged morphology with a locally landward shallowing bed and deep basin on the inner shelf. A slowdown in retreat rate could also have been promoted by convergent ice flow over the inner shelf and the availability of pinning points associated with bathymetric highs around Anvers Island and Hugo Island.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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