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  • 1
    Online Resource
    Online Resource
    SO 258 - INGON - The Indian-Antartic Break-up Engima : Schlussbericht : Laufzeit des Vorhabens: 01.03.2017-31.07.2019, Berichtszeitraum: 01.03.2017-31.07.2019 (2020)
    Bremerhaven : Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (24 Seiten, 12,70 MB) , Illustrationen, Diagramme
    URL: https://doi.org/10.2314/KXP:1692956914
    DOI: 10.2314/KXP:1692956914
    Language: German
    Note: Förderkennzeichen BMBF 03G0258A , Verbundnummer 01177085 , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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    GEOMAR CATALOGUE
    Link to Library Catalog
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  • 2
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    Seafloor evidence for pre-shield volcanism above the Tristan da Cunha mantle plume (2020)
    Nature Research
    Details
    Publication Date: 2023-02-08
    Description: Tristan da Cunha is assumed to be the youngest subaerial expression of the Walvis Ridge hot spot. Based on new hydroacoustic data, we propose that the most recent hot spot volcanic activity occurs west of the island. We surveyed relatively young intraplate volcanic fields and scattered, probably monogenetic, submarine volcanoes with multibeam echosounders and sub-bottom profilers. Structural and zonal GIS analysis of bathymetric and backscatter results, based on habitat mapping algorithms to discriminate seafloor features, revealed numerous previously-unknown volcanic structures. South of Tristan da Cunha, we discovered two large seamounts. One of them, Isolde Seamount, is most likely the source of a 2004 submarine eruption known from a pumice stranding event and seismological analysis. An oceanic core complex, identified at the intersection of the Tristan da Cunha Transform and Fracture Zone System with the Mid-Atlantic Ridge, might indicate reduced magma supply and, therefore, weak plume-ridge interaction at present times.
    Type: Article , PeerReviewed
    Format: text
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Climate model results of Fram Strait and Greenland-Scotland Ridge gateway sensitivity studies of COSMOS in NetCDF format (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Description: Herein, we publish the simulated global annual mean temperature (THO), salinity (SAO), ice compactness (SICOMO), Atlantic Meridional Overturning Circulation (AMOC), Global Meridional Overturning Circulation (GMOC), zonal velocity (UKO), meridional velocity (VKE), 10m u-velocity (u10), 10m v-velocity (v10), mixed layer depth (zmld), horizontal barotropic streamfunction (PSIUWE) and sealevel (ZO) over a time period of 100 years retrieved from equilibrium climate simulations for the Miocene (~23-15 Ma) and use different Greenland-Scotland Ridge (GSR) and Fram Strait (FS) sill depths as a representative for different tectonic settings that occur during the subsidence interval and utilized in the publication by Hossain et al. (2020). The climate data has been produced with COSMOS (ECHAM5/JSBACH/MPIOM/OASIS3), utilized at a resolution of T31 in the atmosphere (19 hybrid sigma-pressure levels) and a resolution of GR30 (bipolar orthogonal curvilinear grid, formal resolution of ~3.0°x1.8°) in the ocean (40 z-coordinate levels). The model setup refers to boundary conditions (incl. changes in orography, bathymetry, physical land surface characteristics, ice sheets, atmospheric CO2) representative for the Miocene. Details on setup and identifiers of Miocene model simulations can be found in Table 1 and Supplementary Table 1 of Hossain et al., 2020.
    Keywords: AWI_PaleoClimate; Fram Strait; Greenland-Scotland Ridge; Miocene; Paleo-climate Dynamics @ AWI; Thermohaline Fingerprints
    Type: Dataset
    Format: application/zip, 290.7 MBytes
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    DATA PANGAEA
  • 4
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    Bathymetry beneath ice shelves of western Dronning Maud Land, East Antarctica (2020)
    PANGAEA
    Details
    Publication Date: 2024-01-30
    Description: The lack of consistent and reliable estimates of the bathymetry beneath the ice shelves of western Dronning Maud Land is addressed by inverting airborne gravity data to model the underlying bathymetry. The gravity inversion is supported by known depth reference points from seismic data, multibeam and ice thickness radar data across grounded ice sheets. The dataset comprises seabed and ice base depths of Ekström, Atka, Jelbart, Fimbul and Vigrid ice shelves relative to WGS84.
    Keywords: Bathymetry; BathymetryModel_wDronningMaudLand; Bed elevation; Coordinate, x, relative; Coordinate, y, relative; Dronning Maud Land; gravity inversion; Ice base elevation; LATITUDE; LONGITUDE; subglacial; western Dronning Maud Land
    Type: Dataset
    Format: text/tab-separated-values, 97909 data points
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    DATA PANGAEA
  • 5
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    Arctic Ocean - multichannel seismic reflection profiles recorded during RV POLARSTERN cruise PS87 (2020)
    PANGAEA
    Details
    Publication Date: 2024-05-28
    Description: A set of multichannel seismic reflection lines across the southeastern Lomonosov Ridge and adjacent basins was collected in 2014 during RV Polarstern cruise ARK XXVIII/3 (PS87). The data provide constraints on the coupled evolution of ocean circulations, deposition regime and regional tectonic processes. The survey set-up for most lines comprised a streamer of 3000 m length (240 channels), and a 24-liter G-gun array. Shots were fired every 15 s resulting into a shot point spacing of 35-40 m. Data were recorded for 12 s at a sample rate of 1 ms. The seismic data processing comprised sorting in a CDP interval of 25 m (= max. fold 145), and velocity analysis (every 100 CDP = 2.5 km). Interval velocities for the seismic units are adopted from the stacking velocities. After the removal of noisy traces and spherical divergence correction the traces were stacked and migrated with a finite-difference time-migration. For a successful suppression of sea floor multiple an f-k filter was applied. In general, the data were filtered with a band pass of 10 - 90 Hz, and an automatic gain control with a gate length of 1000 ms was applied. The dominant frequency of the seismic signals is about 35 Hz, which enables a maximum vertical resolution of about 11-18 m across the sedimentary units. A marked low-frequency reflector with reversed polarity parallels the sea floor at shallow water depths of 190 ms TWT (150 m). The signal turned out to be an arctefact, and in some parts the amplitude strength was succesfully attenuated by a designature filter. The presented data-set provides migrated seismic reflection seismic lines in segy-format.
    Keywords: Arctic Ocean; ARK-XXVIII/4 ALEX2014; AWI_GeoPhy; File format; File name; File size; Lomonosov Ridge; Marine Geophysics @ AWI; Polarstern; PS87; PS87_Lomonosov_Ridge; reflection seismics; SEGY-format; Seismic reflection profile; SEISREFL; Uniform resource locator/link to file
    Type: Dataset
    Format: text/tab-separated-values, 60 data points
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    DATA PANGAEA
  • 6
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    A look beneath the ice shelves of western Dronning Maud Land, East Antarctica: subglacial topography linked to ice shelf stability (2020)
    In:  EPIC3EGU2020: Sharing Geoscience Online, 2020-04-2020-05
    Details
    Publication Date: 2023-06-21
    Description: Antarctica’s ice shelves play a key role in stabilizing their related ice sheets. The ice shelves of western Dronning Maud Land – including the Ekström, Atka, Jelbart, Fimbul and Vigrid ice shelves – currently buttress a catchment that comprises an ice volume equivalent to 0.95 meters of sea level. Any future increase in ice shelf mass loss, with basal melting likely being the main cause, will inevitably accelerate ice sheet drainage and contribute to global sea level rise. Since basal melting largely depends on ice-ocean interactions, it is crucial to attain reliable and consistent bathymetry models to estimate water and heat exchange beneath these ice shelves. We have constructed bathymetry models for an area of about 63,000 km2 beneath the ice shelves of western Dronning Maud Land by inverting airborne gravity data, tied to radar, seismic, and offshore depth reference points. New high-resolution airborne magnetic data across the ice shelves point to Jurassic intrusions and seaward-dipping reflectors originating from Gondwana breakup; enabling us to consider geological density variations as part of the bathymetry modelling process. Our bathymetric models reveal deep glacial troughs beneath the ice shelves, and sills close to the continental shelf breaks which currently limit the possible entry of Warm Deep Water from the Southern Ocean. The present-day average thermocline depth is comparable to the average depths of saddles along the sills, which present gateways into the sub-ice cavities. This leads us to suggest a high sensitivity for these ice shelves to changes in ocean temperature and especially thermocline depth in the future. Once a significant amount of warm water overtops the sills, the deep troughs will allow for fast access to the grounding line, after which it seems there may be little to stop basal melting from rapidly eroding the ice shelves of western Dronning Maud Land.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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    PAPER (OA)
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