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  • 1
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    Beiträge aus geophysikalischen Messungen in Dronning Maud Land, Antarktis, zur Auffindung eines optimalen Bohrpunktes für eine Eiskerntiefbohrung : = Contributions of geophysical measurements in Dronning Maud Land, Antarctica, locating an optimal drill site for a deep ice core drilling (2001)
    Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung
    Details Availability
    Keywords: Core drilling Antarctica ; Cold weather conditions ; Glaciology Antarctica ; Ice Antarctica ; Paleoclimatology Antarctica ; Hochschulschrift ; Königin-Maud-Land ; Eiskappe ; Tiefbohrung ; Standort ; Lokalisation ; Prospektion ; Königin-Maud-Land ; Eiskappe ; Tiefbohrung ; Standort ; Ortsbestimmung ; Prospektion ; Königin-Maud-Land ; Inlandeis ; Dickenmessung ; Elektromagnetische Reflexionsmethode
    Type of Medium: Book
    Pages: IX, 91 S. , zahlr. Ill., graph. Darst.
    Series Statement: Berichte zur Polar- und Meeresforschung 384
    URL: https://www.gbv.de/dms/tib-ub-hannover/328300268.pdf
    DDC: 551.31/0998/9
    RVK:
    RY 20075
    Language: German
    Note: Zsfassung in engl. Sprache , Zugl.: Bremen, Univ., Diss., 2000
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  • 2
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    Balance velocities and measured properties of the Antarctic ice sheet from a new compilation of gridded data for modelling (2000)
    In:  EPIC3Annals of Glaciology, 30, pp. 52-60
    Details
    Publication Date: 2019-07-16
    Description: This paper presents a new compilation of gridded data sets for three-dimensional modeling of the Antarctic ice sheet. These are for surface elevation, icethickness, bedrock elevation and accumulation rate as interpolated on a 281 x 281 mesh with 20 km spacing, and encompass all of the ice sheet and thesurrounding continental shelf. Data sources include the Bamber digital elevation model from ERS-1 radar altimeter data, a redigitization of available ice thicknessdata, the Giovinetto accumulation data, recent ice-thickness data from British and German expeditions as well as accumulation data from German and Norwegianexpeditions. In particular, new data were incorporated for the Filchner-Ronne-Schelfeis and for Dronning Maud Land arising from the EPICA pre-site survey.Special attention was devoted to carefully match the various data sources, both among themselves as across the grounding line and below the ice shelves toenable ice-sheet expansion and retreat in dynamic situations. As an application, the balance flow is calculated over the entire ice sheet using a two-dimensionalfinite difference scheme and compared with a previous assessment. This brought to light the existence of ice-streaming features extending well inland of the icesheet. A detailed zoom over Dronning Maud Land exhibits the general flow characteristics of interest for locating a future deep-drilling site. As a by-product, anupdated value of 26.4 x 106 km3 was obtained for the total volume of the ice sheet and ice shelves, or equivalent to 61.1 m of global sea-level rise after removalof the ice sheet and subsequent oceanic invasion and isostatic rebound. The total accumulation over the grounded ice sheet, including the Antarctic Peninsula, is1924 Gta-1, or between 5 and 20% higher than earlier estimates. Including all of the ice shelves, the value is 2344 Gta-1.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 3
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    BEDMAP: a new ice thickness and subglacial topographic model of Antarctica (2001)
    In:  EPIC3Journal of Geophysical Research, 106(B6), 11, 335, 351 p.
    Details
    Publication Date: 2017-10-20
    Description: Measurements of ice thickness on the Antarctic ice sheet collected during surveys undertaken over the past 50 years have been brought together into a single database. From these data, a seamless suite of digital topographic models have been compiled for Antarctica and its surrounding ocean. This includes grids of ice thickness over the grounded ice sheet and ice shelves, water column thickness beneath the floating ice shelves, bed elevation beneath the grounded ice sheet, and bathymetry to 60°S, including the sub-ice-shelf cavities. These grids are consistent with a recent high-resolution surface elevation model of Antarctica. While the digital elevation models have a nominal spatial resolution of 5 km, such high resolution is justified by the original data density only over a few parts of the ice sheet. The suite does, however, provide an unparalleled vision of the geosphere beneath the ice sheet and a more reliable basis for ice sheet modeling than earlier maps. The toal volume of the Antarctic ice sheet calculated from the BEDMAP grid is 25.4 million km3, and the total sea level equivalent, derived from the amount of ice contained within the grounded ice sheet, is 57 m, comprising 52 m from the East Antarctic ice sheet and 5 m from the West Antarctic ice sheet, slightly less than earlier estimates. The gridded datasets can be obtained from the authors.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
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    Subglacial topography and internal structure of central and western Dronning Maud Land, Antarctica, determined from airborne radio echo sounding. (2001)
    In:  EPIC3Journal of Applied Geophysics, 47, pp. 183-189, ISSN: 0926-9851
    Details
    Publication Date: 2017-10-20
    Description: During five austral summers, from 1994/95 until 1998/99, the Alfred Wegener Institute (AWI)carried out a large airborne radio echo sounding (RES) survey in Dronning Maud Land (DML),Antarctica. These ice thickness measurements are part of the AWI contribution to the pre-site survey for a deep ice core drill site in DML within the European Project for Ice Coringin Antarctica (EPICA). The survey encompasses more than 90,000 km RES profiles over DML and the adjacent coastal area, covering more than 1 million km^2. The lower boundary ofthe ice sheet could be determined area-wide. Internal horizons occuring in the upper two thirds of the ice column can also be traced for several hundred kilometers. This work presents the latest maps of the subglacial topography of the investigated area as well as of an internal horizon.
    Repository Name: EPIC Alfred Wegener Institut
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  • 5
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    Beiträge aus geophysikalischen Messungen in Dronning Maud Land, Antarktis, zur Auffindung eines optimalen Bohrpunktes für eine Eiskerntiefbohrung (2001)
    In:  EPIC3Berichte zur Polar- und Meeresforschung, 384, 91 p., ISSN: 0176-5027
    Details
    Publication Date: 2017-10-20
    Repository Name: EPIC Alfred Wegener Institut
    Type: Thesis , notRev
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  • 6
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    Beiträge aus geophysikalischen Messungen in Dronning Maud Land, Antarktis, zur Auffindung eines optimalen Bohrpunktes für eine Eiskerntiefbohrung = Contributions of geophysical measurements in Dronning Maud Land, Antarctica, locating an optimal drill site for a deep ice core drilling (2001)
    Alfred Wegener Institute for Polar and Marine Research
    In:  EPIC3Berichte zur Polar- und Meeresforschung (Reports on Polar and Marine Research), Bremerhaven, Alfred Wegener Institute for Polar and Marine Research, 384, 91 p., ISSN: 1618-3193
    Details
    Publication Date: 2018-09-07
    Repository Name: EPIC Alfred Wegener Institut
    Type: "Berichte zur Polar- und Meeresforschung" , notRev
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  • 7
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    Interpreting airborne ice penetrating radar data by ice core based numerical forward modeling (2003)
    In:  EPIC3Seventh International Symposium on Antarctic Glaciology (ISAG-7), Milano, Italy, 25-29.8.2003.
    Details
    Publication Date: 2017-10-20
    Description: Interpretation of deep ice cores for paleoclimatic studies requires detailed knowledge of the glacial surrounding of the drilling location.Ice penetrating radar is the only means that allows detailed mapping of the internal structure of the ice body over its whole depth, providing the basis for reconstruction of ice dynamic history.Unfortunately, physical-chemical interpretation of radar data is ambiguous, as several reflection mechanismsmight contribute to the received signal.This lack of information can partly be overcome by numerical forward modeling of radar data utilising dielectric profiling (DEP) data of ice cores.Based on the complex-valued DEP data from the EPICA deep ice core in Dronning Maud Land (EDML), Antarctica,currently spanning 1500 m and approximately 50 ka of climatic history, we model a synthetic radar trace.Validation of the modeled trace is performed by comparison with surveyed airborne radar data retrieved nearthe drill site.The origin of corresponding prominent reflections is investigated by sensitivity studies with altered DEP data.Emphasis is put on the interaction between ice core properties and thepropagating magnetic wave, but the results can also be directly applied to the new radar profile connectingthe EDML and Dome Fuji drilling locations, making it possible to extrapolate ice core properties along continuous radar reflections along the profile.In addition to the presentation of results we also discuss problems and shortcomings of the combination of the different measuring and modeling methods.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 8
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    Age and origin of the ice in the EPICA DML ice core derived from a nested Antarctic ice sheet model (2004)
    In:  EPIC3European Geosciences Union First General Assembly, Nice (F)April 2004., 25
    Details
    Publication Date: 2019-07-16
    Description: For a correct dating and interpretation of the EPICA DML ice core one needs to takeinto account the effects of horizontal advection. That is because the ice core is beingdrilled on a flank position, implying that the ice was not deposited locally. Thedeeper in the ice core, from the further and higher inland the climatic informationwas transported with the ice flow. A potentially complicating factor is that individualice particles may have encountered different strain and thermal regimes alongtheir respective trajectories as the ice sheet geometry changed during the total periodcovered by the ice core. We have addressed these issues with a comprehensive threedimensionalthermomechanical ice-sheet model of the Antarctic ice sheet nested witha detailed higher-order ice-flow model for the area around the drill site. The largescalemodel is based on the shallow ice approximation, considers coupling with an iceshelf and a variable grounding-line, and is implemented on a 20 km grid. The localmodel includes all stress gradients in the force balance and makes use of the mostrecent ice-thickness and accumulation data provided on a 2.5 km grid. The EDML icecore is dated by Lagrangian backtracing carried out by consecutive cubic spline interpolationof a particles location using the reversed 3D velocity field obtained fromforward experiments. This procedure fully accounts for time-dependent changes in icethickness, flow direction, flow velocity, accumulation rate, basal conditions, etc... Animportant output is the palaeo-location of the origin of individual particle paths. Thisinformation is needed to assess the temperature bias introduced by flow effects, whichneeds to be separated from the ice core record to extract the climatic information.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 9
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    Simulation of the ice-dynamical history around the EPICA DML drill site with a nested Antarctic ice sheet model (2004)
    In:  EPIC3European Geosciences Union First General Assembly, Nice (F)April 2004., 25
    Details
    Publication Date: 2019-07-16
    Description: The interpretation of climatic records from deep ice cores requires detailed modelingof the ice-dynamical history around the drill site. This is necessary to determine theorigin and age of the ice and to be able to correctly assess risk factors for stratigraphicdistortions. Of particular importance are the stability of the flow and deformationalpatterns as can be obtained from time-dependent reconstructions of the strain andthermal history along individual particle paths ending up at the drill site. A highresolutionreconstruction of the ice flow is however known to be restricted within thetraditional shallow-ice approximation by the ratio between ice thickness and modelresolution and because certain assumptions break down near to such key regions asice divides. We focus on a 600 x 400 km area around the EPICA drill site and havetherefore nested a higher-order ice-flow model within a large-scale three-dimensionaltime-dependent ice sheet model of the Antarctic ice sheet. The local model includesall stress gradients in the force balance and makes use of the most recent ice-thicknessand accumulation data on a 2.5 km grid. All prognostic calculations take place withinthe large-scale model, which is implemented on a 20 km grid. The fine-scale modelreceives boundary conditions from the large-scale model at lateral boundaries througha transition zone to eliminate the effects of different spatial resolution, but the localmodel does not couple back to the 3-D model. The nested model is run through the last4 glacial cycles. The presentation will focus on the methodology of the model nestingand discuss various results relevant for the interpretation of the EDML ice-core record.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 10
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    Spatial characteristics of accumulation patterns derived from combined data sets on Amundsenisen plateau, Antarctica (2003)
    In:  EPIC3.7th International Symposium on Antarctic Glaciology, Milano
    Details
    Publication Date: 2019-07-16
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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