A5004573115- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Geological Studies and Exploration
- Spacecraft and Cryogenic Technologies
- Marine and environmental studies
- Hydraulic Fracturing and Reservoir Analysis
- CO2 Sequestration and Geologic Interactions
- Microbial Community Ecology and Physiology
- Seismic Imaging and Inversion Techniques
- Isotope Analysis in Ecology
- Water Quality Monitoring and Analysis
- earthquake and tectonic studies
- Metabolomics and Mass Spectrometry Studies
- Geological and Geophysical Studies Worldwide
- Scientific Computing and Data Management
- Marine and coastal ecosystems
- Marine Bivalve and Aquaculture Studies
- Machine Learning in Materials Science
- Geological and Geophysical Studies
- Topic Modeling
- Geological formations and processes
- Seismology and Earthquake Studies
University of Bremen
2022-2025
GEOMAR Helmholtz Centre for Ocean Research Kiel
2011-2020
Leibniz Institute for Neurobiology
2011
published or not.The documents may come from teaching and research institutions in France abroad, public private centers.
The accumulation of methane hydrate in marine sediments is controlled by a number physical and biogeochemical parameters including the thickness gas stability zone (GHSZ), solubility pore fluids, particulate organic carbon at seafloor, kinetics microbial matter degradation generation sediments, sediment compaction ascent deep-seated fluids into GHSZ. Our present knowledge on these controlling factors discussed new estimates global fluxes are provided applying transport-reaction model scale....
Abstract Large amounts of methane hydrate locked up within marine sediments are vulnerable to climate change. Changes in bottom water temperatures may lead their destabilization and the release into column or even atmosphere. In a multimodel approach, possible impact destabilizing hydrates onto global next century is evaluated. The focus set on changing infer response inventory future Present evaluated by combined use hindcast high‐resolution ocean circulation simulations modeling for...
Microbial cells buried in subseafloor sediments comprise a substantial portion of Earth's biosphere and control global biogeochemical cycles; however, the rate at which they use energy (i.e., power) is virtually unknown. Here, we quantify organic matter degradation calculate power utilization microbial throughout Quaternary-age sediments. Aerobic respiration, sulfate reduction, methanogenesis mediate 6.9, 64.5, 28.6% degradation, respectively. The total sediment 37.3 gigawatts, less than...
Marine transform faults and associated fracture zones (MTFFZs) cover vast stretches of the ocean floor, where they play a key role in plate tectonics, accommodating lateral movement tectonic plates allowing connections between ridges trenches. Together with continental counterparts MTFFZs, these structures also pose risk to human societies as can generate high magnitude earthquakes trigger tsunamis. Historical examples are Sumatra-Wharton Basin Earthquake 2012 (M8.6) Atlantic Gloria Fault...
Abstract Marine sediments contribute significantly to global element cycles on multiple time scales. This is due in large part microbial activity the shallower layers and abiotic reactions resulting from increasing temperatures pressures at greater depths. Quantifying rates of these diagenetic changes requires a three-dimensional description physiochemical properties marine sediments. In step toward reaching this goal, we have combined data sets describing bathymetry, heat conduction,...
Abstract. Spatial predictions of total organic carbon (TOC) concentrations and stocks are crucial for understanding marine sediments’ role as a significant sink in the global cycle. In this study, we present geospatial prediction TOC at 5 x arc minute grid scale, using deep learning model — novel machine approach based on new compilation over 22,000 measurements set predictors, such seafloor lithologies, grain size distribution, an alpha-chlorophyll satellite data. our compared discuss...
Abstract Our study presents a basin‐scale 3‐D modeling solution, quantifying and exploring gas hydrate accumulations in the marine environment around Green Canyon (GC955) area, Gulf of Mexico. It is first that considers full complexity formation natural geological system. Overall, it comprises comprehensive basin reconstruction, accounting for depositional transient thermal history basin, source rock maturation, petroleum components generation, expulsion migration, salt tectonics, associated...
Abstract A bottom‐simulating reflector (BSR) occurs west of Svalbard in water depths exceeding 600 m, indicating that gas hydrate occurrence marine sediments is more widespread this region than anywhere else on the eastern North Atlantic margin. Regional BSR mapping shows presence and free several areas, with largest area located north Knipovich Ridge, a slow spreading ridge segment Mid Ridge system. Here heat flow high (up to 330 mW m −2 ), increasing toward axis. The coinciding maxima...
The gas hydrate stability zone (GHSZ) is defined by pressure-temperature-salinity (pTS) constraints of natural (GH) system. It refers to a depth interval which usually extends several hundred meters into the sediment column at sufficient water depths. lower boundary GHSZ often coincides in seismic reflection data with bottom simulating reflector (BSR), indicates transition between underlying free and overlying no-free thermodynamic boundary. geological systems dynamic can shift response...
Abstract. Spatial predictions of total organic carbon (TOC) concentrations and stocks are crucial for understanding marine sediments’ role as a significant sink in the global cycle. In this study, we present geospatial prediction TOC on 5 × arcmin grid, using novel neural network approach. We also provide apply new compilation over 21 000 measurements set predictors, including features such seafloor lithologies, benthic oxygen fluxes, chlorophyll-a satellite data. Moreover, compare different...
Abstract A site at the gas hydrate stability limit was investigated offshore northwestern Svalbard to study methane transport in sediment. The characterized by chemosynthetic communities (sulfur bacteria mats, tubeworms) and venting. Sediments were sampled with situ porewater collectors gravity coring followed analyses of constituents, sediment carbonate geochemistry, microbial activity, taxonomy, lipid biomarkers. Sulfide alkalinity concentrations showed concentration maxima near‐surface...
Marine sediments of the Blake Ridge province exhibit clearly defined geophysical indications for presence gas hydrates and a free phase. Despite being one world’s best-studied hydrate provinces having been drilled during Ocean Drilling Program (ODP) Leg 164, discrepancies between previous model predictions reported chemical profiles as well concentrations result in uncertainty regarding methane sources possible co-existence near base stability zone (GHSZ). Here, by using new multi-phase...
Marine sediments comprise one of the largest microbial habitats and organic carbon sinks on planet. However, it is unclear how variations in sediment physicochemical properties impact microorganisms a global scale. Here we investigate patterns distribution cells, carbon, amounts power used by sediments. Our results show that continental shelves margins predominantly anoxic contains cells whose utilization decreases with depth age. Sediment abyssal zones microbes use low per cell basis,...
The basin-scale distribution of gas hydrates and methane migration pathways in the western Black Sea remains enigmatic, owing to region's complex geological history. Characterizing abundant hydrate accumulations across temporal scales poses significant challenges. In this study, we developed applied a 3D large-scale numerical model study formation, development, fate natural systems sub-basin. Our enables us simulate dynamic evolution basin geometry facies over last 98 million years under...