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  • Journals
  • Articles  (13)
  • ELSEVIER SCIENCE BV  (4)
  • GEOTECHNOLOGIEN  (4)
  • IUGG Secretariat, GFZ German Research Centre for Geosciences  (4)
  • Wiley
  • 2010-2014  (13)
  • 1
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    IUGG Electronic Journal Vol. 13 (2013)
    IUGG Secretariat, GFZ German Research Centre for Geosciences
    Details
    Publication Date: 2020-02-12
    Language: English
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  • 2
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    IUGG Electronic Journal Vol. 14 (2014)
    IUGG Secretariat, GFZ German Research Centre for Geosciences
    Details
    Publication Date: 2020-02-12
    Language: English
    Type: info:eu-repo/semantics/other
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  • 3
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    The globally distributed genus Alexandrium: Multifaceted roles in marine ecosystems and impacts on human health (2012)
    ELSEVIER SCIENCE BV
    In:  EPIC3Harmful Algae, ELSEVIER SCIENCE BV, 10, pp. 10-35, ISSN: 1568-9883
    Details
    Publication Date: 2023-06-21
    Description: The dinoflagellate genus Alexandrium is one of the major harmful algal bloom (HAB) genera with respect to the diversity, magnitude and consequences of blooms. The ability of Alexandrium to colonize multiple habitats and to persist over large regions through time is testimony to the adaptability and resilience of this group of species. Three different families of toxins, as well as an as yet incompletely characterized suite of allelochemicals are produced among Alexandrium species. Nutritional strategies are equally diverse, including the ability to utilize a range of inorganic and organic nutrient sources, and feeding by ingestion of other organisms. Many Alexandrium species have complex life histories that include sexuality and often, but not always, cyst formation, which is characteristic of a meroplanktonic life strategy and offers considerable ecological advantages. Due to the public health and ecosystem impacts of Alexandrium blooms, the genus has been extensively studied, and there exists a broad knowledge base that ranges from taxonomy and phylogeny through genomics and toxin biosynthesis to bloom dynamics and modeling. Here we present a review of the genus Alexandrium, focusing on the major toxic and otherwise harmful species.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
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    Groundwater ages, recharge conditions and hydrochemical evolution of a barrier island freshwater lens (Spiekeroog, Northern Germany) (2012)
    ELSEVIER SCIENCE BV
    In:  EPIC3Journal of Hydrology, ELSEVIER SCIENCE BV, 454-45(0), pp. 173-186, ISSN: 0022-1694
    Details
    Publication Date: 2019-07-17
    Description: Freshwater lenses below barrier islands are dynamic systems affected by changes in morphodynamic patterns, groundwater recharge and discharge. They are also vulnerable to pollution and overabstraction of groundwater. Basic knowledge on hydrogeological and hydrochemical processes of freshwater lenses is important to ensure a sustainable water management, especially when taking into account possible effects of climate change. This is the first study which gives a compact overview on the age distribution, recharge conditions and hydrochemical evolution of a barrier island freshwater lens in the southern North Sea (Spiekeroog Island, Eastfrisian Wadden Sea). Two ground- and surface water sampling campaigns were carried out in May and July 2011, supplemented by monthly precipitation sampling from July to October. 3H–3He ages, stable oxygen and hydrogen isotopes and major ion concentrations show that the freshwater lens reaches a depth of 44 mbsl, where an aquitard constrains further expansion in vertical direction. Groundwater ages are increasing from 4.4 years in 12 mbsl up to 〉70 years at the freshwater– saltwater interface. Stable isotope signatures reflect average local precipitation signatures. An annual recharge rate of 300–400 mm was calculated with 3H–3He data. Freshwater is primarily of Na–Ca–Mg–HCO3– and Ca–Na–HCO3–Cl type, while lowly mineralized precipitation and saltwater are of Na–Cl types. A trend towards heavier stable isotope signatures and higher electric conductivities in the shallower, younger groundwater within the freshwater lens may indicate increasing atmospheric temperatures in the last 30 years.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
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    Community infrastructure and repository for marine magnetic identifications (2014)
    Wiley
    In:  EPIC3Geochemistry Geophysics Geosystems, Wiley, 15(4), pp. 1629-1641, ISSN: 1525-2027
    Details
    Publication Date: 2014-06-25
    Description: Magnetic anomaly identifications underpin plate tectonic reconstructions and form the primary dataset from which age of the oceanic lithosphere and seafloor spreading regimes in the ocean basins can be determined. Although these identifications are an invaluable resource, their usefulness to the wider scientific community has been limited due to the lack of a central community infrastructure to organize, host and update these interpretations. We have developed an open-source, community-driven online infrastructure as a repository for quality-checked magnetic anomaly identifications from all ocean basins. We provide a global sample dataset that comprises 96,733 individually picked magnetic anomaly identifications organized by ocean basin and publication reference, and provide accompanying Hellinger-format files, where available. Our infrastructure is designed to facilitate research in plate tectonic reconstructions or research that relies on an assessment of plate reconstructions, for both experts and non-experts alike. To further enhance the existing repository and strengthen its value, we encourage others in the community to contribute to this effort.
    Repository Name: EPIC Alfred Wegener Institut
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  • 6
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    Deep-sea pre-glacial to glacial sedimentation in the Weddell Sea and southern Scotia Sea from a cross-basin seismic transect (2013)
    ELSEVIER SCIENCE BV
    In:  EPIC3Marine Geology, ELSEVIER SCIENCE BV, 336, pp. 61-83, ISSN: 0025-3227
    Details
    Publication Date: 2019-07-17
    Description: Identification of the pre-glacial, transitional and full glacial components in the deep-sea sedimentary record is necessary to understand the ice sheet development of Antarctica and to build circum-Antarctic sediment thickness grids for palaeotopography/-bathymetry reconstructions, which constrain palaeoclimate models. A ~3300 km long Weddell Sea to Scotia Sea multichannel seismic reflection data transect was constructed to define the first basin-wide seismostratigraphy and to identify the pre-glacial to glacial components. Seven main seismic units were mapped: Of these, WS-S1, WS-S2 and WS-S3 comprise the inferred Cretaceous– Palaeocene pre-glacial regime (〉27 Ma in our age model), WS-S4 the Eocene–Oligocene transitional regime (27–11 Ma) and WS-S5, WS-S6, WS-S7 the Miocene–Pleistocene full glacial climate regime (11–1 Ma). Sparse borehole data from ODP Leg 113 and SHALDRIL constrain the ages of the upper three seismic units and seafloor spreading magnetic anomalies compiled from literature constrain the basement ages in the presented age model. The new horizons and stratigraphy often contradict local studies and show an increase in age from southeast to the northwest. The up to 1130 m thick pre-glacial seismic units form a mound in the central Weddell Sea basin and in conjunction with the eroded flank geometry, allow the interpretation of a Cretaceous proto-Weddell Gyre bottom current. The base reflector of the transitional seismic unit has a model age of 26.6–15.5 Ma from southeast to northwest, suggesting similar southeast to northwest initial ice sheet propagation to the outer shelf. We interpret an Eocene East Antarctic Ice Sheet expansion, Oligocene grounding of the West Antarctic Ice Sheet and Early Miocene grounding of the Antarctic Peninsula Ice Sheet. The transitional regime sedimentation rates in the central and northwestern Weddell Sea (6–10 cm/ky) are higher than in the pre-glacial (1–3 cm/ky) and full glacial regimes (4–8 cm/ky). The pre-glacial to glacial rates are highest in the Jane- and Powell Basins (10–12 cm/ky). Total sediment volume in the Weddell Sea deep-sea basin is estimated at 3.3–3.9×10^6 km3.
    Repository Name: EPIC Alfred Wegener Institut
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  • 7
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    Trophic look at soft-bottom communities — Short-term effects of trawling cessation on benthos (2014)
    ELSEVIER SCIENCE BV
    In:  EPIC3Journal of Sea Research, ELSEVIER SCIENCE BV, 85, pp. 18-28, ISSN: 1385-1101
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    Publication Date: 2019-07-16
    Description: The trophic structure of the German Bight soft-bottom benthic community was evaluated for potential changes after cessation of bottom trawling. Species were collected with van-Veen grabs and beam trawls. Trophic position (i.e. nitrogen stable isotope ratios, δ15N) and energy flow (i.e. species metabolism approximated by body mass scaled abundance) of dominant species were compared in trawled areas and an area protected from fisheries for 14 months in order to detect trawling cessation effects by trophic characteristics. At the community level, energy flow was lower in the protected area, but we were unable to detect significant changes in trophic position. At the species level energy flow in the protected area was lower for predating/scavenging species but higher for interface feeders. Species trophic positions of small predators/scavengers were lower and of deposit feeders higher in the protected area. Major reasons for trophic changes after trawling cessation may be the absence of artificial and additional food sources from trawling likely to attract predators and scavengers, and the absence of physical sediment disturbance impacting settlement/survival of less mobile species and causing a gradual shift in food availability and quality. Our results provide evidence that species or community energy flow is a good indicator to detect trawling induced energy-flow alterations in the benthic system, and that in particular species trophic properties are suitable to capture subtle and short-term changes in the benthos following trawling cessation.
    Repository Name: EPIC Alfred Wegener Institut
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  • 8
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    Early Warning Systems for Transportation Infrastructures : Workshop 9 - 10 February 2009 Fraunhofer IITB Karlsruhe Karlsruhe Institute of Technology (KIT) ; Programme & Abstracts (2010)
    GEOTECHNOLOGIEN
    In:  GEOTECHNOLOGIEN Science Report
    Details
    Publication Date: 2020-02-12
    Description: The Workshop focus was on the specific safety requirements of railbound transportation systems. For the latter, early warning is crucial not only because of the long braking times of trains but also because of the high demands on track geometry and stability necessary for safe train operation. In addition, after a natural disaster, reliable and fast information about the state of the railway infrastructure (damage map) is of utmost importance in order to mitigate the consequences of the disaster. During two days experts from the fields of seismology, sensor technology, railway engineering, computer science, and railway safety reviewed the state of the art and the potential of early warning for transportation systems. Major workshop topics were – seismic early warning and sensors, – early warning of endangered trains, – damage assessment for railway infrastructure, – modern geo-standard based information systems, – train control and safety strategies. Another purpose of the workshop was to delineate the possibilities and limitations of a railway infrastructure integrated network of accelerometers that can be used for permanent structural health monitoring and earthquake early warning.
    Language: English
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  • 9
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    Tomography of the Earth’s Crust – From Geophysical Sounding to Real-Time Monitoring : Status Seminar 2. May 2011, GFZ, German Research Centre for Geosciences, Potsdam ; Programme & Abstracts (2011)
    GEOTECHNOLOGIEN
    In:  GEOTECHNOLOGIEN Science Report
    Details
    Publication Date: 2020-02-12
    Description: The intensive usage of the underground with respect to exploitation, storage of disposals, energy source, and infrastructure as well as tunnel construction requires new or enhanced technologies and methods. High resolution time dependent images are necessary to receive important information about the subsurface. The objective of this research topic is the refinement of tomographic methods and their application to geological processes. A lot of technological developments and innovations have been made in recent years like the real-time data acquisition and evaluation in addition to computer-aided visualization programmes. But there is still the need to integrate und combine different methods in particular inversion methods. This volume summarizes the scientific goals and first results presented during the kick-off seminar at the GFZ German Research Centre for Geosciences in May 2011. The articles reflect the interdisciplinary approach of the research topic. Nine different joint projects are being funded since summer 2010 by the German Federal Ministry of Education and Research in the framework of the R&D Programme GEOTECHNOLOGIEN.
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  • 10
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    Observation of the System Earth from Space : Status Seminar 4. October 2010, Rheinische Friedrich Wilhelms Universität Bonn ; Programme & Abstracts (2010)
    GEOTECHNOLOGIEN
    In:  GEOTECHNOLOGIEN Science Report
    Details
    Publication Date: 2020-02-12
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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