A5043015290- Oceanographic and Atmospheric Processes
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Ocean Waves and Remote Sensing
- Atmospheric and Environmental Gas Dynamics
- Arctic and Antarctic ice dynamics
- Marine and coastal ecosystems
- Geological Studies and Exploration
- Climate variability and models
- Geological formations and processes
- Hydrocarbon exploration and reservoir analysis
- Tropical and Extratropical Cyclones Research
- Isotope Analysis in Ecology
- Microbial Community Ecology and Physiology
- Cryospheric studies and observations
- Marine and fisheries research
- Maritime Navigation and Safety
- Marine and environmental studies
- earthquake and tectonic studies
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Ocean Acidification Effects and Responses
- Geological and Geochemical Analysis
- Marine Biology and Ecology Research
- Geophysics and Gravity Measurements
University of Bremen
2013-2024
Arctic Ocean properties and processes are highly relevant to the regional global coupled climate system, yet still scarcely observed, especially in winter. Team OCEAN conducted a full year of physical oceanography observations as part Multidisciplinary drifting Observatory for Study Climate (MOSAiC), drift with sea ice from October 2019 September 2020. An international team designed implemented program characterize system unprecedented detail, seafloor air-sea ice-ocean interface,...
The effect of volcanic activity on submarine hydrothermal systems has been well documented along fast‐ and intermediate‐spreading centers but not from slow‐spreading ridges. Indeed, eruptions are expected to be rare axes. Here we report the presence venting associated with extremely fresh lava flows at an elevated, apparently magmatically robust segment center southern Mid‐Atlantic Ridge near 5°S. Three high‐temperature vent fields have recognized so far over a strike length less than 2 km...
The southwestern part of the subpolar North Atlantic east Grand Banks Newfoundland and Flemish Cap is a crucial area for Meridional Overturning Circulation. Here exchange between subtropical gyre takes place, southward flowing cold fresh water replaced by northward warm salty within Current (NAC). As long-term experiment, circulation has been studied seven repeat hydrographic sections along (2003–2011), 2 year time series current velocities at continental slope (2009–2011), 19 years sea...
Abstract Species within the genus Alcanivorax are well known hydrocarbon-degraders that propagate quickly in oil spills and natural seepage. They also inhabitants of deep-sea have been found several hydrothermal plumes. However, an in-depth analysis is currently lacking. In this study, we used multiple culture-independent techniques to analyze microbial community composition plumes Northern Tonga arc Northeastern Lau Basin focusing on autecology Alcanivorax. The vents feeding hosted volcano...
Abstract The Aurora hydrothermal system, Arctic Ocean, hosts active submarine venting within an extensive field of relict mineral deposits. Here we show the site is associated with a neovolcanic mound located Gakkel Ridge rift-valley floor, but deep-tow camera and sidescan surveys reveal to be ≥100 m across—unusually large for volcanically hosted vent on slow-spreading ridge more comparable tectonically systems that require time-integrated heat-fluxes form. plume emanating from exhibits much...
Agulhas Rings are anticyclonic, warm-core eddies that play a crucial role in the exchange of water masses between Indian and Atlantic Oceans. Formed at Retroflection near southern tip Africa, these rings constitute an essential component global thermohaline circulation, transporting ocean properties such as heat, salt, energy. Their movement property transfer significantly influence regional climate systems large-scale dynamics. It is well established differ their characteristics. However,...
Winds play a substantial role in the energetic balance of ocean-atmosphere coupled system. They are known to largely influence ocean dynamics, namely by cooling water surface, or inducing upper turbulence. Another consequence passing wind event is excitation internal waves that oscillate at frequency close inertial (near waves, NIWs). These carry energy into different layers and participate their vertical mixing generating shear instability.Both observations models show input mixed layer...
Atmospheric cyclones with strong winds significantly impact ocean circulation, regional sea surface temperature, and deep water formation across the global oceans. Thus they are expected to play a key role in variety of energy transport mechanisms. Even though wind-generated internal gravity waves thought contribute balance ocean, their excitation mechanisms only partly understood. The present study investigates generation during geostrophic adjustment process Boussinesq model axisymmetric...
Abstract Understanding the temporal variability of internal tides plays a crucial role in identifying sources and sinks energy ocean. Using 10‐month‐long time series from moored instruments inside tidal beam south Azores, magnitude underlying causes first two modes tide flux was studied. We analyzed changes direction coherence flux, its modal structure, impact eddies. Semidiurnal fluxes were further compared with estimates 1/10° ocean global circulation model, as well derived satellite...
Conductivity‐temperature‐depth tracer and direct current measurements collected in the northern Red Sea February March 1999 are used to study formation of deep bottom water that region. Historical data showed open ocean convection can contribute renewal intermediate or but cannot ventilate water. The observations no evidence for during winter 1998/1999. overflow from Gulf Aqaba was found be densest mass Sea. An anomaly chlorofluorocarbon component CFC‐12 observed at suggests a strong...
Abstract. There has been a steady increase in interest mining of deep-sea minerals the Clarion–Clipperton Zone (CCZ) eastern Pacific Ocean during last decade. This region is known to be one most eddy-rich regions world ocean. Typically, mesoscale eddies are generated by intense wind bursts channeled through gaps Sierra Madre mountains Central America. Here, we use combination satellite and situ observations evaluate relationship between current variability potential future eddy kinetic...
Oceanic spreading centers north of Iceland are characterized by ultraslow rates, and related hydrothermal activity has been detected in the water column at seafloor along nearly all ridge segments. An exception is 500-km-long Knipovich Ridge, from where, until now, no vents were known. Here we report investigation first vent field which was discovered July 2022 during expedition MSM109. The newly field, named Jøtul associated with eastern bounding fault rift valley rather than an axial...
Hydrothermal vents emit hot fluids enriched in energy sources for microbial life. Here, we compare the ecological and biogeochemical effects of hydrothermal venting two recently discovered volcanic seamounts, Polaris Aurora Gakkel Ridge, ice-covered Central Arctic Ocean. At both sites, persistent plumes increased up to 800 m into deep In non-buoyant plumes, rates carbon fixation were strongly elevated compared background values 0.5-1 μmol
A large‐scale hydrographic survey from 2003 (RV Meteor cruise M59/2) is used to map turbulent mixing by means of eddy diffusivities finescale shear and strain in the subpolar North Atlantic, covering various bathymetric conditions. Results analysis indicate small (O(10 −5 ) m 2 s −1 below Labrador Sea Water layer at mid‐depth open ocean. Higher values exceeding 10 −4 are found abyss close rough topography over flanks Mid‐Atlantic Ridge. The strongest with −3 occurs Deep Western Boundary...
Hydrothermal vents are a source of many trace metals to the oceans. Compared mid-ocean ridges, hydrothermal vent systems at arcs occur in shallower water depth and much more diverse fluid composition, resulting highly variable column metal concentrations. However, only few studies have focused on dynamics plumes volcanic arcs. During R/V Sonne cruise SO253 2016/2017, from two hydrothermally active submarine volcanoes along Kermadec arc Southwest Pacific Ocean were sampled: (1) Macauley,...
The Aurora vent field (82°53.83' N, 6°15.32' W) is located in the weakly stratified Arctic Ocean under perennial ice cover at western edge of ultraslow-spreading Gakkel Ridge, slowest spreading mid-ocean ridge on Earth. Here, we report data dispersal proximal hydrothermal plume this extreme environment. unusual dimensions, with a small horizontal, but large vertical extent, which caused by hydrography Ocean. Water column parameters such as turbidity and redox potential show highly variable...