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  • ELSEVIER SCI LTD  (1)
  • Hanse Wissenschaftskolleg  (1)
  • MINERALOGICAL SOC AMER  (1)
  • Royal Society of London  (1)
  • 2015-2019  (4)
  • 1
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    Coastal ocean and shelf-sea biogeochemical cycling of trace elements and isotopes: lessons learned from GEOTRACES (2016)
    Royal Society of London
    In:  Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 374 (2081). p. 20160076.
    Details
    Publication Date: 2020-06-12
    Description: Continental shelves and shelf seas play a central role in the global carbon cycle. However, their importance with respect to trace element and isotope (TEI) inputs to ocean basins is less well understood. Here, we present major findings on shelf TEI biogeochemistry from the GEOTRACES programme as well as a proof of concept for a new method to estimate shelf TEI fluxes. The case studies focus on advances in our understanding of TEI cycling in the Arctic, transformations within a major river estuary (Amazon), shelf sediment micronutrient fluxes and basin-scale estimates of submarine groundwater discharge. The proposed shelf flux tracer is 228-radium (T1/2 = 5.75 yr), which is continuously supplied to the shelf from coastal aquifers, sediment porewater exchange and rivers. Model-derived shelf 228Ra fluxes are combined with TEI/ 228Ra ratios to quantify ocean TEI fluxes from the western North Atlantic margin. The results from this new approach agree well with previous estimates for shelf Co, Fe, Mn and Zn inputs and exceed published estimates of atmospheric deposition by factors of approximately 3–23. Lastly, recommendations are made for additional GEOTRACES process studies and coastal margin-focused section cruises that will help refine the model and provide better insight on the mechanisms driving shelf-derived TEI fluxes to the ocean.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1098/rsta.2016.0076
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Processes that regulate trace element distribution in the ocean (2018)
    MINERALOGICAL SOC AMER
    In:  EPIC3Elements, MINERALOGICAL SOC AMER, 14, pp. 391-396, ISSN: 1811-5209
    Details
    Publication Date: 2019-01-16
    Description: Trace elements are powerful tracers – and in some instances drivers – of ocean interactions with the atmosphere, the hydrological cycle, the geology of the seafloor, and life on Earth. The concentration and the isotopic composition of trace elements are, therefore, diagnostic tools for the state of the ocean and its role as part of Earth’s dynamic system. Dissolved and particulate transport mechanisms determine how fast the ocean responds to change. The new wealth of data from the international GEOTRACES programme reveals new sources and sinks at all ocean boundaries, highlighting a much more dynamic equilibrium between the seafloor and the ocean than previously thought.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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    PAPER (OA)
  • 3
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    Pacific Proving Grounds radioisotope imprint in the Philippine Sea sediments (2017)
    ELSEVIER SCI LTD
    In:  EPIC3Journal of Environmental Radioactivity, ELSEVIER SCI LTD, ISSN: 0265-931X
    Details
    Publication Date: 2018-05-25
    Description: Radionuclide concentrations were studied in sediment cores taken at the continental slope of the Philippine Sea off Mindanao Island in the equatorial Western Pacific. High resolution deposition records of anthropogenic radionuclides were collected at this site. Excess 210Pb together with excess 228Th and anthropogenic radionuclides provided information about accumulation rates. Concentrations of Am and Pu isotopes were detected by gamma spectrometry, alpha spectrometry and ICP-MS. The Pu ratios indicate a high portion (minimum of 60%) of Pu from the Pacific Proving Grounds (PPG). This implies that the transport of PPG derived plutonium with the Mindanao Current southward is similarly effective as the previously known transport towards the north with the Kuroshio Current. The record is compared to other studies from northwest Pacific marginal seas and Lombok basin in the Indonesian Archipelago. The sediment core top was found to contain a 6 cm thick layer dominated by terrestrial organic matter, which was interpreted as a result of the 2012 Typhoon Pablo-related fast deposition.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 4
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    Glacial and Interglacial Circulation of the Southwest Pacific_An Update (2017)
    Hanse Wissenschaftskolleg
    In:  EPIC3Atmosphere-ocean changes in the Southeast Pacific – from glacial/interglacial to instrumental time-scales, Hanse Wissenschaftskolleg, 2017-04-03-2017-04-06Delmenhorst, Hanse Wissenschaftskolleg
    Details
    Publication Date: 2017-07-31
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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    PAPER (OA)
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