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  • 1
    Online Resource
    Online Resource
    Malediven Karbonatstratigraphie, IODP pre-site survey : Schlussbericht zum Vorhaben 03G0236A - MALSTROM (2017)
    Hamburg : [Institut für Geologie, Universität Hamburg]
    Details Availability
    Keywords: Forschungsbericht ; Malediven ; Carbonatplattform
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (41 Seiten, 3,01 MB) , Illustrationen
    URL: https://edocs.tib.eu/files/e01fb17/887989926.pdf
    URL: https://doi.org/10.2314/GBV:887989926
    DOI: 10.2314/GBV:887989926
    Language: German
    Note: Förderkennzeichen BMBF 03G0236A , Unterschiede zwischen dem gedruckten Dokument und der elektronischen Ressource können nicht ausgeschlossen werden
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    GEOMAR CATALOGUE
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  • 2
    Online Resource
    Online Resource
    Saya de Malha carbonates, oceanography and biogeochemistry, Western Indian Ocean; Ausfahrt SO270 : Abschlussbericht zum Vorhaben 03G0270A-MASCARA (2021)
    [Hamburg] : [Institut für Geologie der Universität Hamburg]
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 1 Online-Ressource (41 Seiten, 7,09 MB) , Illustrationen, Diagramme, Karten
    URL: https://edocs.tib.eu/files/e01fb23/1859793924.pdf
    URL: https://doi.org/10.2314/KXP:1859793924
    DOI: 10.2314/KXP:1859793924
    Language: German
    Note: Förderkennzeichen BMBF 03G0270A , Verbundnummer 01185012 , Laufzeit: 01.05.2019 bis 31.10.2021 , Literaturverzeichnis: Seite 34-38
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  • 3
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    Carbonate platform drowning caught in the act: The sedimentology of Saya de Malha Bank (Indian Ocean) (2022)
    Betzler, Christian ; Lindhorst, Sebastian ; Reijmer, John J. G. ; [et al.]
    Details
    Publication Date: 2023-11-27
    Description: Mesophotic reefs, hardgrounds and current‐controlled pelagic to hemipelagic carbonates are facies marking carbonate platform drowning successions, irrespective of the factors controlling this evolution. A modern analogue of a carbonate platform in a state of drowning, where these facies occur has not been properly reported on to date. In the present study, the sedimentary environments of the Saya de Malha Bank are characterized using a multi‐disciplinary approach including sedimentology, hydroacoustics, seismics and oceanography. The Saya de Malha Bank edifice with a surface of 40 808 km〈sup〉2〈/sup〉 is located in the tropical Indian Ocean and lies in a water depth of 8 to 300 m extending from the surrounding more than 2000 m deep ocean floor, with no reef reaching the sea surface. Mesophotic coral and red algal facies co‐exist with hemipelagic and bioclastic sands, together with a hardground. Ocean currents and internal waves are identified as major sedimentological controlling factors in the absence of elevated nutrient influx. Many features distributed along the present‐day Saya de Malha Bank were described from studies presenting fossil examples of carbonate platform drowning. The results herein can therefore be applied to other drowning examples, in some cases allowing for more accurate interpretation of the stratigraphic record.
    Description: Bundesministerium für Bildung und Forschung http://dx.doi.org/10.13039/501100002347
    Keywords: ddc:552.58 ; Internal waves, Mascarene Plateau ; mesophotic reefs ; South Equatorial Current
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 4
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    Distribution and characteristics of marine habitats in a subpolar bay based on hydroacoustics and bed shear stress estimates—Potter Cove, King George Island, Antarctica (2014)
    Springer
    In:  Geo-Marine Letters, 34 (5). pp. 435-446.
    Details
    Publication Date: 2017-07-14
    Description: Marine habitats worldwide are increasingly pressurized by climate change, especially along the Antarctic Peninsula. Well-studied areas in front of rapidly retreating tidewater glaciers like Potter Cove are representative for similar coastal environments and, therefore, shed light on habitat formation and development on not only a local but also regional scale. The objective of this study was to provide insights into habitat distribution in Potter Cove, King George Island, Antarctica, and to evaluate the associated environmental processes. Furthermore, an assessment concerning the future development of the habitats is provided. To describe the seafloor habitats in Potter Cove, an acoustic seabed discrimination system (RoxAnn) was used in combination with underwater video images and sediment samples. Due to the absence of wave and current measurements in the study area, bed shear stress estimates served to delineate zones prone to sediment erosion. On the basis of the investigations, two habitat classes were identified in Potter Cove, namely soft-sediment and stone habitats that, besides influences from sediment supply and coastal morphology, are controlled by sediment erosion. A future expansion of the stone habitat is predicted if recent environmental change trends continue. Possible implications for the Potter Cove environment, and other coastal ecosystems under similar pressure, include changes in biomass and species composition.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s00367-014-0375-1
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Biogenic silica cycling in the Skagerrak (2023)
    Frontiers
    Details
    Publication Date: 2024-02-07
    Description: Dissolved silicate (H4SiO4) is essential for the formation of the opaline skeletal structures of diatoms and other siliceous plankton. A fraction of particulate biogenic silica (bSi) formed in surface waters sinks to the seabed, where it either dissolves and returns to the water column or is permanently buried. Global silica budgets are still poorly constrained since data on benthic bSi cycling are lacking, especially on continental margins. This study describes benthic bSi cycling in the Skagerrak, a sedimentary depocenter for particles from the North Sea. Biogenic silica burial fluxes, benthic H4SiO4 fluxes to the water column and bSi burial efficiencies are reported for nine stations by evaluating data from in-situ benthic landers and sediment cores with a diagenetic reaction-transport model. The model simulates bSi contents and H4SiO4 concentrations at all sites using a novel power law to describe bSi dissolution kinetics with a small number of adjustable parameters. Our results show that, on average, 1100 mmol m-2 yr-1 of bSi rains down to the Skagerrak basin seafloor, of which 50% is released back to overlying waters, with the remainder being buried. Biogenic silica cycling in the Skagerrak is generally consistent with previously reported global trends, showing higher Si fluxes and burial efficiencies than deep-sea sites and similar values compared to other continental margins. A significant finding of this work is a molar bSi-to-organic carbon burial ratio of 0.22 in Skagerrak sediments, which is distinctively lower compared to other continental margins. We suggest that the continuous dissolution of bSi in suspended sediments transported over long distances from the North Sea leads to the apparent decoupling between bSi and organic carbon in Skagerrak sediments.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: other
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Determination and quantification of sedimentary processes in salt marshes using end‐member modelling of grain‐size data (2023)
    Wiley
    Details
    Publication Date: 2024-02-07
    Description: End-member modelling of bulk grain-size distributions allows the unravelling of natural and anthropogenic depositional processes in salt marshes and quantification of their respective contribution to marsh accretion. The sedimentology of two marshes is presented: (1) a sheltered back-barrier marsh; and (2) an exposed, reinstated foreland marsh. Sedimentological data are supplemented by an age model based on lead-210 decay and caesium-137, as well as geochemical data. End-member modelling of grain-size data shows that marsh growth in back-barrier settings is primarily controlled by the settling of fines from suspension during marsh inundation. In addition, nearby active dunes deliver aeolian sediment (up to 77% of the total sediment accretion), potentially enhancing the capability of salt marshes to adapt to sea-level rise. Growth of exposed marshes, by contrast, primarily results from high-energy inundation and is attributed to two sediment-transport processes. On the seaward edge of the marsh, sedimentation is dominated by coarser-grained traction load, whereas further inland, settling of fine-grained suspension load prevails. In addition, a third, coarse-grained sediment sub-population is interpreted to derive from anthropogenic land-reclamation measures, that is material from drainage channels relocated onto the marsh surface. This process contributed up to 34% to the total marsh accretion and terminated synchronously with the end of land reclamation measures. Data suggest that natural sediment supply to marshes alone is sufficient to outpace contemporary sea-level rise in the study area. This underlines the resilience potential of salt marshes in times of rising sea levels. The comparison of grain-size sub-populations with observed climate variability implies that even managed marshes allow for the extraction of environmental signals if natural and anthropogenic sedimentary processes are determined and their relative contribution to bulk sediment composition is quantified. Data series based solely on bulk sediments, however, seem to be of limited use because it is difficult to exclude bias of natural signals by anthropogenic measures.
    Type: Article , PeerReviewed
    Format: text
    Format: image
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 7
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    A look into the temporal variability of sedimentation rates in the Skagerrak to track human and natural impacts in the North Sea (2024)
    Frontiers
    Details
    Publication Date: 2024-02-21
    Type: Article , NonPeerReviewed , info:eu-repo/semantics/article
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    OceanRep: Article in a Scientific Journal - without review
  • 8
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    Sedimentary and tectonic evolution of Lake Ohrid (Macedonia/Albania) (2014)
    Wiley-Blackwell
    Details
    Publication Date: 2014-02-12
    Description: Lake Ohrid, located on the Balkan Peninsula within the Dinaride-Albanide-Hellenide mountain belt, is a tectonically active graben within the South Balkan Extensional Regime (SBER). Interpretation of multichannel seismic cross sections and bathymetric data reveals that Lake Ohrid formed during two main phases of deformation: (1) a transtensional phase which opened a pull-apart basin, and (2) an extensional phase which led to the present geometry of Lake Ohrid. After the initial opening, a symmetrical graben formed during the Late Miocene, bounded by major normal faults on each side in a pull-apart type basin. The early-stage geometry of the basin has a typical rhomboidal shape restricted by two sets of major normal faults. Thick undisturbed sediments are present today at the site where the acoustic basement is deepest, illustrating that Lake Ohrid is a potential target for drilling a long and continuous sediment core for studying environmental changes within the Mediterranean region. Neotectonic activity since the Pliocene takes place along the roughly N-S striking Eastern and Western Major Boundary Normal Faults that are partly exposed at the present lake floor. The tectono-sedimentary structure of the basin is divided in three main seismic units overlying the acoustic basement associated with fluvial deposits and lacustrine sediments. A seismic facies analysis reveals a prominent cyclic pattern of high- and low amplitude reflectors. We correlate this facies cyclicity with vegetation changes within the surrounding area that are associated with glacial/interglacial cycles. A clear correlation is possible back to ~450 kyrs. Extrapolation of average sedimentation rates for the above mentioned period results in age estimate of ~ 2 Myrs for the oldest sediments in Lake Ohrid. This article is protected by copyright. All rights reserved.
    Print ISSN: 0950-091X
    Electronic ISSN: 1365-2117
    Topics: Geosciences
    Published by Wiley-Blackwell
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    PAPER CURRENT
  • 9
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    Multibeam bathymetry raw data (EM 120 echosounder entire dataset) of RV METEOR during cruise M74/4 (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Multibeam bathymetry raw data using the ship's own Kongsberg (Simrad) EM 120 multibeam echosounder was not continuously recorded during RV METEOR cruise M74/4. Data was recorded on 15 days between 2007-11-30 and 2007-12-14. This dataset contains a survey at the islands of the Maldives. The approximate average depth of the entire dataset is around 700m. The data are archived at the Federal Maritime and Hydrographic Agency of Germany (Bundesamt für Seeschifffahrt und Hydrographie, BSH) and provided to PANGAEA database for data curation and publication. Ancillary sound velocity profiles (SVP) files from the cruise are not archived at the BSH, thus no SVP files are added to this dataset. However, data analysis of the multibeam raw data revealed that SVP has been changed several times during the survey. This publication is conducted within the efforts of the German Marine Research Alliance in the core area "Data management and Digitalization" (Deutsche Allianz Meeresforschung, DAM). Data are unprocessed and therefore contains incorrect depth measurements (artifacts) without further processing. Overall, it appears that the data quality is rather good to moderate since the gridded hillshade data showed relatively few obstacles. It appears, that the Kongsberg EM 710 multibeam echosounder was simultaneously running during data acquisition since the coverage is nearly the same (https://doi.org/10.1594/PANGAEA.942458). However this did not significantly affecting data quality (nevertheless, based on the data, whether a direct interference between both system exists is unknown). Data can be processed e.g. with the open source software package MB-System (Caress, D. W., and D. N. Chayes, MB-System: Mapping the Seafloor, http://www.mbari.org/products/research-software/mb-system/, 2022).
    Keywords: Bathymetry; Binary Object; Binary Object (File Size); Binary Object (Media Type); Comment; DAM_Underway; DAM Underway Research Data; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; File content; Kongsberg datagram raw file name; LATITUDE; LONGITUDE; M74/4; M74/4_0_Underway-1; Meteor (1986); Multibeam Echosounder; NEOMA: The Neogene of the Maldives; Number of pings; Ship speed; Start of data file, depth; Start of data file, heading; Start of data file recording, date/time; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file, depth; Stop of data file, heading; Stop of data file recording, date/time; Stop of data file recording, latitude; Stop of data file recording, longitude; Swath-mapping system Simrad EM-120 (Kongsberg Maritime AS)
    Type: Dataset
    Format: text/tab-separated-values, 7724 data points
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    DATA PANGAEA
  • 10
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    Multibeam bathymetry raw data (Kongsberg EM710 entire dataset) of RV METEOR during cruise M74/4 (2022)
    PANGAEA
    Details
    Publication Date: 2024-04-20
    Description: Multibeam bathymetry raw data using the ship's own Kongsberg EM 710 multibeam echosounder was not continuously recorded during RV METEOR cruise M74/4. Data was recorded on 16 days between 2007-11-29 and 2007-12-14. This dataset contains a survey at the islands of the Maldives. The approximate average depth of the entire dataset is around 425m. The data are archived at the Federal Maritime and Hydrographic Agency of Germany (Bundesamt für Seeschifffahrt und Hydrographie, BSH) and provided to PANGAEA database for data curation and publication. Ancillary sound velocity profiles (SVP) files from the cruise are not archived at the BSH, thus no SVP files are added to this dataset. However, data analysis of the multibeam raw data revealed that SVP has been changed several times during the survey. This publication is conducted within the efforts of the German Marine Research Alliance in the core area "Data management and Digitalization" (Deutsche Allianz Meeresforschung, DAM). Data are unprocessed and therefore contains incorrect depth measurements (artifacts) without further processing. Overall, it appears that the data quality is rather poor since the gridded hillshade data showed relatively many obstacles (artifacts). It appears, that the Kongsberg (Simrad) EM 120 multibeam echosounder was simultaneously running during data acquisition since the data coverage is nearly the same. However whether this was affecting the data quality is unknown. The corresponding dataset of the Kongsberg (Simrad) EM 120 multibeam echosounder is comparably of much better data quality (https://doi.org/10.1594/PANGAEA.942457). Data can be processed e.g. with the open source software package MB-System (Caress, D. W., and D. N. Chayes, MB-System: Mapping the Seafloor, http://www.mbari.org/products/research-software/mb-system/, 2022).
    Keywords: Bathymetry; Binary Object; Binary Object (File Size); Binary Object (Media Type); Comment; DAM_Underway; DAM Underway Research Data; Data file recording distance; Data file recording duration; DATE/TIME; ELEVATION; File content; Kongsberg datagram raw file name; LATITUDE; LONGITUDE; M74/4; M74/4_0_Underway-2; Meteor (1986); Multibeam Echosounder; NEOMA: The Neogene of the Maldives; Number of pings; Ship speed; Start of data file, depth; Start of data file, heading; Start of data file recording, date/time; Start of data file recording, latitude; Start of data file recording, longitude; Stop of data file, depth; Stop of data file, heading; Stop of data file recording, date/time; Stop of data file recording, latitude; Stop of data file recording, longitude; Swath-mapping system Simrad EM710 (Kongsberg Maritime AS)
    Type: Dataset
    Format: text/tab-separated-values, 13536 data points
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    DATA PANGAEA
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