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  • PANGAEA  (110)
  • ASLO (Association for the Sciences of Limnology and Oceanography)  (2)
  • 2015-2019  (112)
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Year
  • 1
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    Linked sediment and water-column methanotrophy at a man-made gas blowout in the North Sea: Implications for methane budgeting in seasonally stratified shallow seas (2016)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 61 (S1). S367-S386.
    Details
    Publication Date: 2019-02-01
    Description: Large quantities of the greenhouse gas methane (CH4) are stored in the seafloor. The flux of CH4 from the sediments into the water column and finally to the atmosphere is mitigated by a series of microbial methanotrophic filter systems of unknown efficiency at highly active CH4-release sites in shallow marine settings. Here, we studied CH4-oxidation and the methanotrophic community at a high-CH4-flux site in the northern North Sea (well 22/4b), where CH4 is continuously released since a blowout in 1990. Vigorous bubble emanation from the seafloor and strongly elevated CH4 concentrations in the water column (up to 42 µM) indicated that a substantial fraction of CH4 bypassed the highly active (up to ∼2920 nmol cm−3 d−1) zone of anaerobic CH4-oxidation in sediments. In the water column, we measured rates of aerobic CH4-oxidation (up to 498 nM d−1) that were among the highest ever measured in a marine environment and, under stratified conditions, have the potential to remove a significant part of the uprising CH4 prior to evasion to the atmosphere. An unusual dominance of the water-column methanotrophs by Type II methane-oxidizing bacteria (MOB) is partially supported by recruitment of sedimentary MOB, which are entrained together with sediment particles in the CH4 bubble plume. Our study thus provides evidence that bubble emission can be an important vector for the transport of sediment-borne microbial inocula, aiding in the rapid colonization of the water column by methanotrophic communities and promoting their persistence close to highly active CH4 point sources.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.1002/lno.10388
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Effects of climate change on methane emissions from seafloor sediments in the Arctic Ocean: A review (2016)
    ASLO (Association for the Sciences of Limnology and Oceanography)
    In:  Limnology and Oceanography, 61 (S1). pp. 301-309.
    Details
    Publication Date: 2019-09-24
    Description: Large quantities of methane are stored in hydrates and permafrost within shallow marine sediments in the Arctic Ocean. These reservoirs are highly sensitive to climate warming, but the fate of methane released from sediments is uncertain. Here, we review the principal physical and biogeochemical processes that regulate methane fluxes across the seabed, the fate of this methane in the water column, and potential for its release to the atmosphere. We find that, at present, fluxes of dissolved methane are significantly moderated by anaerobic and aerobic oxidation of methane. If methane fluxes increase then a greater proportion of methane will be transported by advection or in the gas phase, which reduces the efficiency of the methanotrophic sink. Higher freshwater discharge to Arctic shelf seas may increase stratification and inhibit transfer of methane gas to surface waters, although there is some evidence that increased stratification may lead to warming of sub-pycnocline waters, increasing the potential for hydrate dissociation. Loss of sea-ice is likely to increase wind speeds and seaair exchange of methane will consequently increase. Studies of the distribution and cycling of methane beneath and within sea ice are limited, but it seems likely that the sea-air methane flux is higher during melting in seasonally ice-covered regions. Our review reveals that increased observations around especially the anaerobic and aerobic oxidation of methane, bubble transport, and the effects of ice cover, are required to fully understand the linkages and feedback pathways between climate warming and release of methane from marine sediments.
    Type: Article , PeerReviewed , info:eu-repo/semantics/article
    Format: text
    DOI: 10.1002/lno.10307
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    TRACTION - a transport reaction model specifically designed to account for non-ideal transport and reaction effects (2018)
    PANGAEA
    In:  Supplement to: Haffert, Laura; Haeckel, Matthias (2019): Quantification of non-ideal effects on diagenetic processes along extreme salinity gradients at the Mercator mud volcano in the Gulf of Cadiz. Geochimica et Cosmochimica Acta, 244, 366-382, https://doi.org/10.1016/j.gca.2018.09.038
    Details
    Publication Date: 2023-01-13
    Description: Presented is an example of the transport-reaction code (TRACTION) applied to the simulation of pore water species in the seawater mixing zone at Mercator Mud volcano in the Gulf of Cadiz. TRACTION was specifically designed to account for non-ideal transport effects in the presence of thermodynamic (e.g. salinity or temperature) gradients. The model relies on the most fundamental concept of solute diffusion, which states that the chemical potential gradient (Maxwell's model) rather than the concentration gradient (Fick's law) is the driving force for diffusion. In turn, this requires accounting for species interactions by applying Pitzer's method to derive species chemical potentials and Onsager coefficients instead of using the classical diffusion coefficients. Electrical imbalances arising from varying diffusive fluxes in multicomponent systems, like seawater, are avoided by applying an electrostatic gradient as an additional transport contribution.
    Type: Dataset
    Format: application/zip, 1.4 MBytes
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    DATA PANGAEA
  • 4
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    The SUGAR Toolbox - Version 7 (2015)
    PANGAEA
    In:  Supplement to: Kossel, Elke; Bigalke, Nikolaus; Piñero, Elena; Haeckel, Matthias (2013): The SUGAR Toolbox - A library of numerical algorithms and data for modelling of gas hydrate systems and marine environments. GEOMAR Report (N. Ser.), 8, 160 pp., https://doi.org/10.3289/geomar_rep_ns_8_2013
    Details
    Publication Date: 2023-02-24
    Description: The SUGAR Toolbox contains scripts coded in MATLAB for calculating various thermodynamic, kinetic, and geologic properties of substances occurring in the marine environment, particularly gas hydrate and seep systems. Brief descriptions of the toolbox scripts and some notes on the underlying basic theory as well as tables of additional property values can be found in the accompanying documentation.
    Keywords: GEOMAR; Helmholtz Centre for Ocean Research Kiel
    Type: Dataset
    Format: application/zip, 3.7 MBytes
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    DATA PANGAEA
  • 5
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    CaCO3 corrected metal geochemistry data of gravity cores from SONNE cruise SO242/1 at the DISCOL area, Peru Basin (2019)
    PANGAEA
    Details
    Publication Date: 2023-05-04
    Description: In order to account for dilution effects of carbonate layers, metal data has been CaCO3 corrected for better comparison within and between the cores.
    Keywords: Aluminium; Barium; CaCO3 corrected; Calcium carbonate; Cerium; Cobalt; Copper; Depth, corrected; DEPTH, sediment/rock; Dysprosium; Elevation of event; Erbium; Europium; Event label; Gadolinium; GC; Gravity corer; Holmium; Iron; JPI-OCEANS; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Lanthanum; Latitude of event; Longitude of event; Lutetium; Manganese; Molybdenum; Neodymium; Nickel; Phosphorus; Praseodymium; Samarium; Sample code/label; SO242/1; SO242/1_100-1; SO242/1_100-1_GC 5; SO242/1_123-1; SO242/1_123-1_GC 6; SO242/1_132-1; SO242/1_132-1_GC 7; SO242/1_38-1; SO242/1_38-1_GC 1; SO242/1_51-1; SO242/1_51-1_GC 2; SO242/1_84-1; SO242/1_84-1_GC 3; SO242/1_89-1; SO242/1_89-1_GC 4; Sonne_2; Terbium; Thulium; Uranium; Vanadium; Ytterbium; Yttrium
    Type: Dataset
    Format: text/tab-separated-values, 2687 data points
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    DATA PANGAEA
  • 6
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    North Sea Gas Release Experiment with link to ROV video during station CE12010_44 (2019)
    PANGAEA
    In:  Supplement to: Vielstädte, Lisa; Linke, Peter; Schmidt, Mark; Sommer, Stefan; Haeckel, Matthias; Braack, Malte; Wallmann, Klaus (2019): Footprint and detectability of a well leaking CO₂ in the Central North Sea: Implications from a field experiment and numerical modelling. International Journal of Greenhouse Gas Control, 84, 190-203, https://doi.org/10.1016/j.ijggc.2019.03.012
    Details
    Publication Date: 2023-07-07
    Description: Video showing the gas release experiment, which has been conducted at ~80 m water depth in the vicinity of the Sleipner CO2 storage site in the North Sea. The gas discharge was observed in situ during a 4 hour dive with GEOMAR's remotely operated vehicle ROV Kiel 6000 equipped with HD camera/video device.
    Keywords: 44ROV12; carbon dioxide; CE12010; CE12010_44; Celtic Explorer; ECO2; gas release experiment; geological storage; leakage; North Sea; Remote operated vehicle; ROV; Sleipner; Sub-seabed CO2 Storage: Impact on Marine Ecosystems
    Type: Dataset
    Format: video/quicktime, 517.2 MBytes
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    DATA PANGAEA
  • 7
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    Geochemistry of sediment cores during SONNE cruises SO242/1 and SO242/2 at the DISCOL area, Peru Basin (2019)
    PANGAEA
    Details
    Publication Date: 2024-02-16
    Description: This data compilation includes geochemical data on the solid and solute phases of the seafloor sediments in the DISCOL area in the Peru basin (South Pacific). The DISCOL area represents a part of the deep sea that is extensively covered with manganese nodules and represents a unique study area, where in 1989 a circular area with a diameter of about 2 nautical miles was intensely disturbed with a plough-harrow. The presented data was collected during the two legs of the SO242 research cruise in 2015 with the aim to better understand the ecological impacts of deep-sea seafloor disturbances (e.g. through nodule mining operations). Several devices were deployed at each sampling site to retrieve surface and subsurface sediment samples: (i) a Oktopus multiple-corer (MUC), which samples the upper 20 – 40 cm of the sediment including the overlying bottom water; The corer was equipped with a TV-Camera system for precise positioning, e.g. for sampling specific seafloor features like the disturbance tracks; (ii) a ROV-deployed push-corer (PUC) focusing on small-scale topographic features created by the seafloor disturbance; (iii) a box-corer (BC - USNEL Spade Corer) to sample the sediment inclusive macrofauna as well as associated nodules; and (iv) a gravity-corer (GC) extracting sediment up to 10 mbsf.
    Keywords: JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact
    Type: Dataset
    Format: application/zip, 64 datasets
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    DATA PANGAEA
  • 8
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    Porewater geochemistry of sediment push core SO242/2_169_PUC-10 (2018)
    PANGAEA
    In:  GEOMAR - Helmholtz Centre for Ocean Research Kiel
    Details
    Publication Date: 2024-02-16
    Keywords: DEPTH, sediment/rock; JPI-OCEANS; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Nitrite; Photometry; PUC; Push corer; SO242/2; SO242/2_169_PUC-10; Sonne_2; South Pacific Ocean, Peru Basin
    Type: Dataset
    Format: text/tab-separated-values, 10 data points
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    DATA PANGAEA
  • 9
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    Particulate geochemistry of sediment core SO242/1_129-1_BC 26 (2018)
    PANGAEA
    In:  GEOMAR - Helmholtz Centre for Ocean Research Kiel
    Details
    Publication Date: 2024-02-16
    Keywords: BC; Box corer; Calcium carbonate; Carbon, inorganic, total; Carbon, organic, total; Carbon, total; DEPTH, sediment/rock; Element analyser CNS, Carlo Erba NA1500; JPI-OCEANS; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Nitrogen, total; Porosity, volume; SO242/1; SO242/1_129-1; SO242/1_129-1_BC 26; Sonne_2; Sulfur, total
    Type: Dataset
    Format: text/tab-separated-values, 133 data points
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    DATA PANGAEA
  • 10
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    Particulate geochemistry of sediment core SO242/1_132-1_GC 7 (2018)
    PANGAEA
    In:  GEOMAR - Helmholtz Centre for Ocean Research Kiel
    Details
    Publication Date: 2024-02-16
    Keywords: Calcium carbonate; Carbon, inorganic, total; Carbon, organic, total; Carbon, total; DEPTH, sediment/rock; Element analyser CNS, Carlo Erba NA1500; GC; Gravity corer; JPI-OCEANS; JPI Oceans - Ecological Aspects of Deep-Sea Mining; JPIO-MiningImpact; Nitrogen, total; Porosity, volume; SO242/1; SO242/1_132-1; SO242/1_132-1_GC 7; Sonne_2; Sulfur, total
    Type: Dataset
    Format: text/tab-separated-values, 520 data points
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    DATA PANGAEA
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