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  • 2015-2019  (10)
  • 1990-1994
  • 2017  (10)
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  • 2015-2019  (10)
  • 1990-1994
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  • 1
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    Shallow gas migration along hydrocarbon wells – An unconsidered, anthropogenic source of biogenic methane in the North Sea (2017)
    ACS (American Chemical Society)
    In:  Environmental Science & Technology, 51 (17). pp. 10262-10268.
    Details
    Publikationsdatum: 2020-02-06
    Beschreibung: Shallow gas migration along hydrocarbon wells constitutes a potential methane emission pathway that currently is not recognized in any regulatory framework or greenhouse gas inventory. Recently, the first methane emission measurements at three abandoned offshore wells in the Central North Sea (CNS) were conducted showing that considerable amounts of biogenic methane originating from shallow gas accumulations in the overburden of deep reservoirs were released by the boreholes. Here, we identify numerous wells poking through shallow gas pockets in 3D seismic data of the CNS indicating that about one third of the wells may leak, potentially releasing a total of 3-17 kt of methane per year into the North Sea. This poses a significant contribution to the North Sea methane budget. A large fraction of this gas (~42 %) may reach the atmosphere via direct bubble transport (0-2 kt yr-1) and via diffusive exchange of methane dissolving in the surface mixed layer (1-5 kt yr-1), as indicated by numerical modeling. In the North Sea and in other hydrocarbon-prolific provinces of the world shallow gas pockets are frequently observed in the sedimentary overburden and aggregate leakages along the numerous wells drilled in those areas may be significant.
    Materialart: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    Format: text
    Format: text
    DOI: 10.1021/acs.est.7b02732
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 2
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    Remotely Operated Vehicle “ROV KIEL 6000“ (2017)
    Forschungszentrum Jülich GmbH
    In:  Journal of Large-Scale Research Facilities JLSRF, 3 (A117).
    Details
    Publikationsdatum: 2017-09-06
    Beschreibung: The remotely operated vehicle ROV KIEL 6000 is a deep diving platform rated for water depths of 6000 meters. It is linked to a surface vessel via an umbilical cable transmitting power (copper wires) and data (3 single-mode glass fibers). As standard it comes equipped with still and video cameras and two different manipulators providing eyes and hands in the deep. Besides this a set of other tools may be added depending on the mission tasks, ranging from simple manipulative tools such as chisels and shovels to electrically connected instruments which can send in-situ data to the ship through the ROVs network, allowing immediate decisions upon manipulation or sampling strategies.
    Materialart: Article , NonPeerReviewed
    Format: text
    DOI: 10.17815/jlsrf-3-160
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - nicht begutachtet
  • 3
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    2. Wochenbericht RV POSEIDON Reise 518/2 [POS518/2] (2017)
    In:  UNSPECIFIED, 2 pp.
    Details
    Publikationsdatum: 2017-10-27
    Beschreibung: 12 Oktober - 27 Oktober 2017 (Bremerhaven - Kiel)
    Materialart: Report , NonPeerReviewed
    Format: text
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Wochenberichte
  • 4
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    1. Wochenbericht RV POSEIDON Reise 518/2 [POS518/2] (2017)
    In:  UNSPECIFIED, 2 pp.
    Details
    Publikationsdatum: 2017-10-27
    Beschreibung: 12 Oktober - 27 Oktober 2017 (Bremerhaven - Kiel)
    Materialart: Report , NonPeerReviewed
    Format: text
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Wochenberichte
  • 5
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    Remotely Operated Vehicle “ROV PHOCA“ (2017)
    Forschungszentrum Jülich GmbH
    In:  Journal of Large-Scale Research Facilities JLSRF, 3 (A118).
    Details
    Publikationsdatum: 2018-04-27
    Beschreibung: The remotely operated vehicle ROV PHOCA is a deep diving platform rated for water depths of 3000 meters. The ROV is linked to a surface vessel via an umbilical cable transmitting power (copper wires) and data (3 single-mode glass fibers). As standard it comes equipped with still and video cameras and two different manipulators providing eyes and hands in the deep. Special emphasis was put on the compatibility of numerous systems with the existing ROV KIEL 6000 to facilitate the use of both systems on various research vessels with a given team of ROV pilots. Besides this, a set of other tools may be added depending on the mission tasks, ranging from simple manipulative tools as chisels and shovels to electrically connected instruments which can send insitu data to the ship through the ROVs network, allowing immediate decisions upon manipulation or sampling strategies.
    Materialart: Article , NonPeerReviewed
    Format: text
    DOI: 10.17815/jlsrf-3-162
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - nicht begutachtet
  • 6
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    Modeling Polyp Activity of Paragorgia arborea using Supervised Learning (2017)
    Elsevier
    Details
    Publikationsdatum: 2022-10-04
    Beschreibung: While the distribution patterns of cold-water corals, such as Paragorgia arborea, have received increasing attention in recent studies, little is known about their in situ activity patterns. In this paper, we examine polyp activity in P. arborea using machine learning techniques to analyze high-resolution time series data and photographs obtained from an autonomous lander cluster deployed in the Stjernsund, Norway. An interactive illustration of the models derived in this paper is provided online as supplementary material. We find that the best predictor of the degree of extension of the coral polyps is current direction with a lag of 3h. Other variables that are not directly associated with water currents, such as temperature and salinity, offer much less information concerning polyp activity. Interestingly, the degree of polyp extension can be predicted more reliably by sampling the laminar flows in the water column above the measurement site than by sampling the more turbulent flows in the direct vicinity of the corals. Our results show that the activity patterns of the P. arborea polyps are governed by the strong tidal current regime of the Stjernsund. It appears that P. arborea does not react to shorter changes in the ambient current regime but instead adjusts its behavior in accordance with the large-scale pattern of the tidal cycle itself in order to optimize nutrient uptake.
    Materialart: Article , PeerReviewed
    Format: text
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 7
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    Submarine pockmarks area localization using in-situ radio-tracing technique in Eckernförde bay, Germany (2017)
    In:  [Talk] In: 26. Annual Symposium of Hellenic Nuclear Physics Society, 09.06.-10.06.2017, Anavyssos, Greece .
    Details
    Publikationsdatum: 2018-05-09
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Vortrag
  • 8
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    Research technologies at GEOMAR (2017)
    In:  [Talk] In: 5. Conference on Mediterranean Sea Research, 14.11.2017, Haifa, Israel .
    Details
    Publikationsdatum: 2017-11-21
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    OceanRep: Vortrag
  • 9
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    Dealing with legacy wells: Leakage of shallow gas along hydrocarbon wells in the North Sea (2017)
    In:  [Talk] In: 11. IEAGHG Monitoring Network Meeting, 13.-15.06.2017, Traverse City, USA .
    Details
    Publikationsdatum: 2018-04-13
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    OceanRep: Vortrag
  • 10
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    Monitoring technologies and modular observatories (2017)
    In:  [Talk] In: Workshop on Future Marine Technologies, Israel Oceanographic and Limnological Research Institute, 15.11.2017, Haifa, Israel .
    Details
    Publikationsdatum: 2017-11-21
    Materialart: Conference or Workshop Item , NonPeerReviewed
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Vortrag
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