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  • 11
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    Radon (222Rn) as tracer for submarine groundwater discharge investigation—limitations of the approach at shallow wind‐exposed coastal settings (2022)
    SPRINGER
    In:  EPIC3Environmental Monitoring and Assessment, SPRINGER, 194(798), ISSN: 0167-6369
    Details
    Publication Date: 2022-09-20
    Description: Mapping radon (222Rn) distribution pat- terns in the coastal sea is a widely applied method for localizing and quantifying submarine groundwater discharge (SGD). While the literature reports a wide range of successful case studies, methodical problems that might occur in shallow wind-exposed coastal settings are generally neglected. This paper evalu- ates causes and effects that resulted in a failure of the radon approach at a distinct shallow wind-exposed location in the Baltic Sea. Based on a simple radon mass balance model, we discuss the effect of both wind speed and wind direction as causal for this fail- ure. We show that at coastal settings, which are domi- nated by gentle submarine slopes and shallow waters, both parameters have severe impact on coastal radon distribution patterns, thus impeding their use for SGD investigation. In such cases, the radon approach needs necessarily to allow for the impact of wind speed and wind direction not only during but also prior to the field campaign.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 12
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    Distribution of radioisotopes in polymetallic nodules from the CCZ collected during SONNE cruise SO239 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: This dataset comprises gamma spectrometric measurements of radioisotopes in samples from polymetallic nodules, which were collected in the framework of the European collaborative JPI Oceans MiningImpact project onboard R/V SONNE cruise SO239 in 2015. Samples were taken from different parts of the nodules (topside surface (s), bottom surface (b), interior (i)). The gamma radiation was measured in a Canberra well-type HPGe detector. Emission lines at 46 keV (Pb-210), 63 keV (U-234 via Th-234), 67 keV (Th-230), 186 keV (Ra-226 in absence of U-235 interference), 295 keV (Ra-226 via Rn-222) and 402 keV (Pa-231 via Rn-219 with some uncertainty on the intermediate Pa-231/Ac-227 equilibrium) were evaluated. The diluted uranium ore standard RGU-1 and the uranium ore standard UREM-11 served as calibration and reference, respectively.
    Keywords: AWI_MarGeoChem; BC; BC20; BC28; BC31; BC9; Box corer; Clarion Clipperton Fracture Zone; Depth, bottom/max; Depth, top/min; Event label; isotope data; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Lead-210; Lead-210, error; Marine Geochemistry @ AWI; North Pacific Ocean; polymetallic nodules; Protactinium-231; Protactinium-231, error; Radioactivity; Radium-226; Radium-226, error; Radon-222; Radon-222, error; Sample code/label; Sample mass; Sample type; SO239; SO239_119-1; SO239_180-1; SO239_195-1; SO239_60-1; SO239_88-1; Sonne_2; Thorium-230; Thorium-230, error; Time in seconds; Uranium-234; Uranium-234, error
    Type: Dataset
    Format: text/tab-separated-values, 440 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 13
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    Radionuclide activities for sediment core SO268/2_125-1 (MUC-25) at a disturbed site after a small-scale dredge experiment during RV SONNE cruise SO268/2 in the CCZ, Pacific Ocean (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: This dataset comprises downcore measurements of the activity of different radionuclides for a sediment core (MUC) retrieved from disturbed sites after a small-scale dredge experiment in the framework of the European collaborative JPI Oceans MiningImpact project onboard R/V SONNE cruise SO268 in 2019. The scientific work during cruise SO268 was part of the second phase of the MiningImpact project (Environmental impacts and risks of deep-sea mining) and is designed to assess the environmental impacts of deep-sea mining of polymetallic nodules in the Clarion-Clipperton Zone (CCZ) in the Pacific Ocean. After performing total acid digestions, the sediments were analyzed by isotope dilution using ICP-SF-MS (Element2, Thermo Scientific) for the determination of radionuclides at the Marine Geochemistry Lab, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven.
    Keywords: Anthropogenic disturbances; Area/locality; AWI_MarGeoChem; Clarion-Clipperton Fraction Zone, North East Pacific Ocean; Clarion Clipperton Fracture Zone; Core; deep sea mining; deep sea sediment; DEPTH, sediment/rock; Geochemical data; ICP-SF-MS, Thermo Scientific, Element 2; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Marine Geochemistry @ AWI; MUC-25; Multicorer with television; Salt-corrected; SO268/2; SO268/2_125-1; Sonne_2; Station label; Thorium-230; Thorium-230, error; Thorium-230, supported; Thorium-230 excess; Thorium-230 excess, error; Thorium-232; Thorium-232, error; TVMUC; Uranium-234; Uranium-234, error; Uranium-235; Uranium-235, error; Uranium-238; Uranium-238, error
    Type: Dataset
    Format: text/tab-separated-values, 435 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 14
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    Radon emanation from polymetallic nodules from the CCZ collected during SONNE cruises SO239 and SO268/2 (2022)
    PANGAEA
    Details
    Publication Date: 2024-06-12
    Description: This dataset comprises radon concentrations emanated from four polymetallic nodules of different sizes from the CCZ. The nodules were collected in the framework of the European collaborative JPI Oceans MiningImpact project onboard R/V SONNE cruises SO239 in 2015 and SO268 in 2019. Radon emanation was measured by enclosing the nodules in a glass chamber (volume = 2.02 L) while continuously circulating the gas in the system through a Rad7 device (Durrige Inc.), which is designed to measure specifically radon. As comparison, a 4.6 Bq Ra-226 standard was analyzed. The concentrations were evaluated with the Capture® software.
    Keywords: AWI_MarGeoChem; BC; BC20; BC31; BC9; Box corer; Calculated; calculated, 2 sigma; Clarion-Clipperton Fraction Zone, North East Pacific Ocean; Clarion Clipperton Fracture Zone; Dredge; DRG; DRG-01; Emanated; Event label; isotope data; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Marine Geochemistry @ AWI; North Pacific Ocean; polymetallic nodules; Radioactivity; Radon-222; Radon-222, uncertainty; Sample code/label; SO239; SO239_119-1; SO239_195-1; SO239_60-1; SO268/2; SO268/2_119-1; Sonne_2; Time in hours
    Type: Dataset
    Format: text/tab-separated-values, 750 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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