A5010139488- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Planetary Science and Exploration
- Astro and Planetary Science
- Geological and Geochemical Analysis
- Space Exploration and Technology
- earthquake and tectonic studies
- Ocean Acidification Effects and Responses
- CO2 Sequestration and Geologic Interactions
- Paleontology and Stratigraphy of Fossils
- Geological and Geophysical Studies
- Geochemistry and Elemental Analysis
- Marine and environmental studies
- Marine and coastal ecosystems
- Geochemistry and Geologic Mapping
- Oceanographic and Atmospheric Processes
- Offshore Engineering and Technologies
- Geological formations and processes
- Underwater Acoustics Research
- Sparse and Compressive Sensing Techniques
- Groundwater and Isotope Geochemistry
- Geological Studies and Exploration
- Marine Biology and Ecology Research
GEOMAR Helmholtz Centre for Ocean Research Kiel
2016-2025
Brock University
2011-2024
Graz University of Technology
2022
Geological Survey of Canada
2015
University of British Columbia
2008-2014
Kiel University
2000-2012
Laboratoire des Sciences du Climat et de l'Environnement
2012
Institut national de recherche en informatique et en automatique
2011
University of Bayreuth
2004-2011
Sorbonne Université
2011
This article reviews recent advances in convex optimization algorithms for Big Data, which aim to reduce the computational, storage, and communications bottlenecks.We provide an overview of this emerging field, describe contemporary approximation techniques like first-order methods randomization scalability, survey important role parallel distributed computation.The new Data are based on surprisingly simple principles attain staggering accelerations even classical problems. Convex wake...
Inland waters transport and transform substantial amounts of carbon account for ∼18% global methane emissions. Large reservoirs with higher areal release rates than natural contribute significantly to freshwater However, there are millions small dams worldwide that receive trap high loads organic can therefore potentially emit significant the atmosphere. We evaluated effect damming on emissions in a central European impounded river. Direct comparison riverine reservoir reaches, where...
Enhanced weathering of mafic and ultra-mafic minerals has been suggested as a strategy for carbon dioxide removal (CDR) contribution to achieve balance between global CO 2 sources sinks (net zero emission). This study was designed assess CDR by dissolution ultramafic sand (UMS) in artificial seawater (ASW). Fine grained UMS with an olivine content ~75% reacted ASW up 134 days at 1 bar 21.5–23.9°C. A decline total alkalinity (TA) observed over the course experiments. unexpected result...
Research Article| March 01, 2004 Fluid expulsion related to mud extrusion off Costa Rica—A window the subducting slab C. Hensen; Hensen 1Sonderforschungsbereich 574, Kiel University, Wischhofstrasse 1-3, 24148 Kiel, Germany, and GEOMAR, Germany Search for other works by this author on: GSW Google Scholar K. Wallmann; Wallmann 2GEOMAR, Sonderforschungsbereich M. Schmidt; Schmidt 3Institute of Geosciences, Ludewig-Meyn-Strasse 10, 24118 C.R. Ranero; Ranero 4 E. Suess Author Article Information...
We developed a portable mass spectrometric system ("miniRuedi") for quantificaton of the partial pressures He, Ne (in dry gas), Ar, Kr, N2, O2, CO2, and CH4 in gaseous aqueous matrices environmental systems with an analytical uncertainty 1-3%. The miniRuedi does not require any purification or other preparation sampled gases therefore allows maintenance-free autonomous operation. apparatus is most suitable on-site gas analysis during field work at remote locations due to its small size (60...
Carbon capture and storage (CCS) is a key technology to reduce carbon dioxide (CO2) emissions from industrial processes in feasible, substantial, timely manner. For geological CO2 be safe, reliable, accepted by society, robust strategies for leakage detection, quantification management are crucial. The STEMM-CCS (Strategies Environmental Monitoring of Marine Capture Storage) project aimed provide techniques understanding enable inform cost-effective monitoring CCS sites the marine...
Recent studies have begun to explore the potential of enhanced benthic weathering (EBW) in Baltic Sea as a measure for climate change mitigation. To augment understanding EBW under seasonally changing conditions, this study aims investigate processes anoxia hypoxia corrosive bottom waters, which reflect late summer conditions Sea. Dunite and calcite were added sediment cores retrieved from Eckernförde Bay (Western Sea) with constant flow-through deoxygenated, CO 2 -enriched water. The...
ABSTRACT The brine-seawater interface of the Kebrit Deep, northern Red Sea, was investigated for presence microorganisms using phylogenetic analysis combined with cultivation methods. Under strictly anaerobic culture conditions, novel halophiles were isolated. new rod-shaped isolates belong to halophilic genus Halanaerobium and are first representatives obtained from deep-sea, brine pools. Within , they represent species which grow chemoorganotrophically at NaCl concentrations ranging 5 34%....
Coronary Heart Disease can be diagnosed by assessing the regional motion of heart walls in ultrasound images left ventricle. Even for experts, are difficult to interpret leading high intra-observer variability. Previous work indicates that order approach this problem, interactions between different regions and their overall influence on clinical condition need considered. To do this, we propose a method jointly learning structure parameters conditional random fields, formulating these tasks...
Abstract During opening of a new ocean, magma intrudes into the surrounding sedimentary basins. Heat provided by intrusions matures host rock, creating metamorphic aureoles potentially releasing large amounts hydrocarbons. These hydrocarbons may migrate to seafloor in hydrothermal vent complexes sufficient volumes trigger global warming, e.g., during Paleocene-Eocene Thermal Maximum (PETM). Mound structures at top buried observed seismic data off Norway were previously interpreted as...
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. Benthic microbial methanogenesis is a known source of methane in marine systems. In most sediments, the majority located below sulfate-reducing zone, as sulfate reducers outcompete methanogens for major substrates hydrogen and acetate. The coexistence reduction has been shown before possible through usage noncompetitive by such methanol or methylated amines. However, knowledge about magnitude, seasonality, environmental controls this production sparse. present study, presence...
Abstract First reported in the 1960s, offshore freshened groundwater (OFG) has now been documented most continental margins around world. In this review we compile a database documenting OFG occurrences and analyze it to establish general characteristics controlling factors. We also assess methods used map characterize OFG, identify major knowledge gaps, propose strategies address them. global volume of 1 × 10 6 km 3 ; predominantly occurs within 55 coast down water depth 100 m. is mainly...
Hydrocarbon gas emissions from with decommissioned wells are an underreported source of greenhouse in oil and provinces. The associated may partly counteract efforts to mitigate fossil fuel infrastructure. We have developed approach for assessing methane leakage marine based on a combination existing regional industrial seismic newly acquired hydroacoustic water column imaging data the Central North Sea. Here, we present which show that 28 out 43 investigated release seafloor into column....
The interface between the hypersaline brine and overlying sea-water (brine-seawater interface) of Shaban Deep, northern Red Sea was investigated for presence microorganisms using 16S rRNA gene as a molecular marker. Samples south east basin (depth: 1331 m 1332 respectively) were selected to ascertain microbial diversity this extreme and, so far, unexplored environment. Phylogenetic analysis revealed novel lineages within Bacteria, Crenarchaeota Euryarchaeota. Novel representatives KB1...
Research Article| June 01, 2006 Submarine volcanoes and high-temperature hydrothermal venting on the Tonga arc, southwest Pacific Peter Stoffers; Stoffers 1 Institute of Geosciences, University Kiel, Olshausenstrasse 40, 24118 Germany Search for other works by this author on: GSW Google Scholar Tim J. Worthington; Worthington Ulrich Schwarz-Schampera; Schwarz-Schampera 2Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, 30655 Hannover, Mark D. Hannington; Hannington 3Department...
Submersible dives on 22 active submarine volcanoes the Mariana and Tonga‐Kermadec arcs have discovered systems six of these that, in addition to discharging hot vent fluid, are also venting a separate CO 2 ‐rich phase either form gas bubbles or liquid droplets. One most impressive is Champagne site NW Eifuku northern Arc, which cold droplets at an estimated rate 23 mol /s, about 0.1% global mid‐ocean ridge (MOR) carbon flux. Three other Arc (NW Rota‐1, Nikko, Daikoku), two (Giggenbach...
[1] A natural carbon dioxide (CO2) seep was discovered during an expedition to the southern German North Sea (October 2008). Elevated CO2 levels of ∼10–20 times above background were detected in seawater a salt dome ∼30 km north East-Frisian Island Juist. single elevated value 53 higher than measured, indicating possible point source from seafloor. Measured pH values around 6.8 support modeled for observed high concentration. These results are presented context seepage detection, light...