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  • 1
    Online Resource
    Online Resource
    Major bottom water ventilation events do not significantly reduce basin-wide benthic N and P release in the Eastern Gotland Basin (Baltic Sea) (2017)
    Associated volumes
    Details Availability
    In: Frontiers in Marine Science, Lausanne : Frontiers Media, 2014, Bd. 4 (2017), Article 18, 2296-7745
    In: volume:4
    In: year:2017
    Type of Medium: Online Resource
    Pages: Diagramme, Karten
    ISSN: 2296-7745
    URL: https://www.frontiersin.org/articles/10.3389/fmars.2017.00018/full
    DOI: 10.3389/fmars.2017.00018
    Language: English
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  • 2
    Online Resource
    Online Resource
    Global-scale quantification of mineralization pathways in marine sediments : a reaction-transport modeling approach (2009)
    Associated volumes
    Details Availability
    In: Geochemistry, geophysics, geosystems, Hoboken, NJ : Wiley, 2000, 10(2009), 10, 1525-2027
    In: volume:10
    In: year:2009
    In: number:10
    In: extent:24
    Type of Medium: Online Resource
    Pages: 24 , graph. Darst
    ISSN: 1525-2027
    DOI: 10.1029/2009GC002484
    Language: English
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  • 3
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    Report on the Managing Impacts of Deep-seA reSource exploitation (MIDAS) workshop on environmental management of deep-sea mining (2016)
    In:  EPIC3Research Ideas and Outcomes, 2, pp. e10292, ISSN: 2367-7163
    Details
    Publication Date: 2017-01-27
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , notRev , info:eu-repo/semantics/article
    Format: application/pdf
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    PAPER (OA)
  • 4
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    A method for the calculation of anaerobic oxidation of methane rates across regional scales: an example from the Belt Seas and The Sound (North Sea–Baltic Sea transition) (2013)
    SPRINGER
    In:  EPIC3Geo-Marine Letters, SPRINGER, 33, pp. 299-310, ISSN: 0276-0460
    Details
    Publication Date: 2017-06-21
    Description: Estimating the amount of methane in the seafloor globally as well as the flux of methane from sediments toward the ocean–atmosphere system are important considerations in both geological and climate sciences. Nevertheless, global estimates of methane inventories and rates of methane production and consumption through anaerobic oxidation in marine sediments are very poorly constrained. Tools for regionally assessing methane formation and consumption rates would greatly increase our understanding of the spatial heterogeneity of the methane cycle as well as help constrain the global methane budget. In this article, an algorithm for calculating methane consumption rates in the inner shelf is applied to the gas-rich sediments of the Belt Seas and The Sound (North Sea–Baltic Sea transition). It is based on the depth of free gas determined by hydroacoustic techniques and the local methane solubility concentration. Due to the continuous nature of shipboard hydroacoustic measurements, this algorithm captures spatial heterogeneities in methane fluxes better than geochemical analyses of point sources such as observational/sampling stations. The sensibility of the algorithm with respect to the resolution of the free gas depth measurements (2 m vs. 50 cm) is proven of minor importance (a discrepancy of 〈10%) for a small part of the study area. The algorithm-derived anaerobic methane oxidation rates compare well with previous measured and modeling studies. Finally, regional results reveal that contemporary anaerobic methane oxidation in worldwide inner-shelf sediments may be an order of magnitude lower (ca. 0.24 Tmol year–1) than previous estimates (4.6 Tmol year–1). These algorithms ultimately help improve regional estimates of anaerobic oxidation of methane rates.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
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    Towards improved monitoring of offshore carbon storage: A real-world field experiment detecting a controlled sub-seafloor CO2 release (2021)
    In:  EPIC3International Journal of Greenhouse Gas Control, 106, pp. 103237, ISSN: 17505836
    Details
    Publication Date: 2021-12-15
    Description: Carbon capture and storage (CCS) is a key technology to reduce carbon dioxide (CO2) emissions from industrial processes in a feasible, substantial, and timely manner. For geological CO2 storage to be safe, reliable, and accepted by society, robust strategies for CO2 leakage detection, quantification and management are crucial. The STEMM-CCS (Strategies for Environmental Monitoring of Marine Carbon Capture and Storage) project aimed to provide techniques and understanding to enable and inform cost-effective monitoring of CCS sites in the marine environment. A controlled CO2 release experiment was carried out in the central North Sea, designed to mimic an unintended emission of CO2 from a subsurface CO2 storage site to the seafloor. A total of 675 kg of CO2 were released into the shallow sediments (~3 m below seafloor), at flow rates between 6 and 143 kg/d. A combination of novel techniques, adapted versions of existing techniques, and well-proven standard techniques were used to detect, characterise and quantify gaseous and dissolved CO2 in the sediments and the overlying seawater. This paper provides an overview of this ambitious field experiment. We describe the preparatory work prior to the release experiment, the experimental layout and procedures, the methods tested, and summarise the main results and the lessons learnt.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
    Format: application/pdf
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  • 6
    Electronic Resource
    Electronic Resource
    The role of dimensionality in the kinetic Ising model of spinodal decomposition: Evidence from zero-temperature quenches (1987)
    Springer
    Journal of statistical physics 49 (1987), S. 661-667 
    Details
    ISSN: 1572-9613
    Keywords: Kinetic Ising model ; nonequilibrium phenomena ; dimensionality ; relevant variables ; spinodal decomposition ; interface energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study a three-dimensional Ising lattice gas model with spin-exchange dynamics quenched from infinite to zero temperature. We consider a wide range of values of the binary composition (i.e., magnetization) and annealed vacancy concentration. We find that, as in two dimensions, the system freezes in a configuration very far from equilibrium, and that the interface energy per bond in the frozen state, which is very large, in all cases takes very nearly the same values as in two dimensions. We discuss the implications of these results regarding the irrelevance of dimensionality in this problem.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01009351
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Un morceau (1993)
    [s.l.] : Nature Publishing Group
    Nature 363 (1993), S. 577-577 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR - The British Library has purchased the William Petty papers from Lord Shelburne for £1 million. . . A million pounds was paid, I read1, To satisfy Lord Shelburne's need. (It would be libellous, I fear, If "greed" for "need" were written here!) Sir William's papers, maps and things, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/363577e0
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  • 8
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    Growth and survival of the winged oyster Pteria colymbus in suspended culture: influence of environmental factors associated to upwelling periods (2017)
    Springer
    In:  Aquaculture International, 25 (4). pp. 1653-1666.
    Details
    Publication Date: 2020-02-06
    Description: The present study examines the influence that environmental variables exerted on changes in condition index (CI), shell height (SH—dorsal-ventral axis) and soft tissue mass increments (STM) of the winged oyster Pteria colymbus in suspended culture during periods of upwelling (December to April) and non-upwelling (August to November) in the Cariaco Gulf, northeastern Venezuela. Environmental variables recorded between April 2012 and May 2013 included seston, water transparency, temperature, dissolved oxygen, chlorophyll a (Chl a) and the upwelling index (UI). Individuals were cultivated in lantern nets with an overall density of 56 individuals/0.123 m2. From three randomly chosen baskets, five individuals were sampled each month and changes in CI, STM and SH were related to the environmental variables using Spearman correlation and PCA. Results show that during upwelling, both Chl a and UI presented a positive and significant relationship with the oyster condition and growth parameters. During non-upwelling (low UI), this relationship was inverse, demonstrating the important influence of upwelling and non-upwelling periods on the ecophysiology of the species. Furthermore, it was shown that the non-upwelling, characterized by high temperatures and low food availability, is a critical period for P. colymbus, judging by a decrease in growth and survival rate. Nonetheless, this species reached 50 mm in 5 months, a size considered as commercially viable, suggesting that the study area is favourable to the cultivation of the winged oyster despite a dramatic decrease in upwelling intensity in the last decade.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1007/s10499-017-0141-2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 9
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    Carbon regeneration in the Cariaco Basin, Venezuela (2017)
    Instituto Oceanográfico da Universidade de São Paulo, SciELO
    In:  Brazilian Journal of Oceanography, 65 (1). pp. 19-28.
    Details
    Publication Date: 2020-02-06
    Description: The carbon regeneration in the water column of the Cariaco Basin (Venezuela) was investigated using a regression model of total alkalinity (TA) and the concentration of total inorganic carbon (TCO2). Primary productivity (PP) was determined from the inorganic carbon fraction assimilated by phytoplankton and the variation of the 22 and 23ºC isotherm was used as an indicator of coastal upwelling. The results indicate that CO2 levels were lowest (1962 µmol/kg) at the surface and increased to 2451 µmol/kg below the oxic-anoxic redox interface. The vertical regeneration distribution of carbon was dominated (82%) by organic carbon originating from the soft tissue of photosynthetic organisms, whereas 18% originated from the dissolution of biogenic calcite. The regeneration of organic carbon was highest in the surface layer in agreement with the primary productivity values. However, at the oxic-anoxic interface a second more intense maximum was detected (70-80%), generated by chemotrophic respiration of organic material by microorganisms. The percentages in the anoxic layers were lower than in the oxic zone because aerobic decomposition occurs more rapidly than anaerobic respiration of organic material because more labile fractions of organic carbon have already been mineralized in the upper layers.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1590/S1679-87592017121406501
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 10
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    Sedimentary molybdenum cycling in the aftermath of seawater inflow to the intermittently euxinic Gotland Deep, Central Baltic Sea (2018)
    Elsevier
    In:  Chemical Geology, 491 . pp. 27-38.
    Details
    Publication Date: 2021-02-08
    Description: Molybdenum (Mo) concentrations and isotope compositions in sediments and shales are commonly used as proxies for anoxic and sulfidic (i.e., euxinic) conditions in the water column of paleo-marine systems. A basic assumption underlying this practice is that the proxy signal extracted from the geological record is controlled by long-term (order of decades to millennia) Mo scavenging in the euxinic water column rather than Mo deposition during brief episodes or events (order of weeks to months). To test whether this assumption is viable we studied the biogeochemical cycling of Mo and its isotopes in sediments of the intermittently euxinic Gotland Deep in the central Baltic Sea. Here, multiannual to decadal periods of euxinia are occasionally interrupted by inflow events during which well‑oxygenated water from the North Sea penetrates into the basin. During these events manganese (Mn) (oxyhydr)oxide minerals are precipitated in the water column, which are known to scavenge Mo. We present sediment and pore water Mo and Mo isotope data for sediment cores which were taken before and after a series of inflow events between 2014 and 2016. After seawater inflow, pore water Mo concentrations in anoxic surface sediments exceed the salinity-normalized concentration by more than two orders of magnitude and coincide with transient peaks of dissolved Mn. A fraction of the Mo liberated into the pore water is transported by diffusion in a downward direction and sequestered by organic matter within the sulfidic zone of the sediment. Diffusive flux calculations as well as a mass balance that is based on the sedimentary Mo isotope composition suggest that about equal proportions of the Mo accumulating in the basin are delivered by Mn (oxyhydr)oxide minerals during inflow events and Mo scavenging with hydrogen sulfide during euxinic periods. Since the anoxic surface sediment where Mo is released from Mn (oxyhydr)oxides are separated by several centimeters from the deeper sulfidic layers where Mo is removed, the solid phase record of Mo concentration and isotope composition would be misinterpreted if steady state Mo accumulation was assumed. Based on our observations in the Gotland Deep, we argue that short-term redox fluctuations need to be considered when interpreting Mo-based paleo-records.
    Type: Article , PeerReviewed
    Format: text
    Format: other
    Format: other
    Format: text
    DOI: 10.1016/j.chemgeo.2018.04.031
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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