A5041550287- Oceanographic and Atmospheric Processes
- Marine and coastal ecosystems
- Climate variability and models
- Hydrocarbon exploration and reservoir analysis
- Marine and environmental studies
- Ocean Waves and Remote Sensing
- Meteorological Phenomena and Simulations
- Geological formations and processes
- Methane Hydrates and Related Phenomena
- Marine Biology and Ecology Research
- Geological Studies and Exploration
- Atmospheric and Environmental Gas Dynamics
- Geology and Paleoclimatology Research
- Marine and fisheries research
- Coastal and Marine Dynamics
- Reservoir Engineering and Simulation Methods
- Microbial Community Ecology and Physiology
- Underwater Acoustics Research
- NMR spectroscopy and applications
- Wastewater Treatment and Nitrogen Removal
- Coastal wetland ecosystem dynamics
- Tropical and Extratropical Cyclones Research
- Geological and Geophysical Studies
- Peatlands and Wetlands Ecology
- Selenium in Biological Systems
Leibniz Institute for Baltic Sea Research
2015-2024
Swedish Meteorological and Hydrological Institute
2022
Uganda National Meteorological Authority
2022
Stockholm University
2022
National Institute of Meteorology
2022
AT Sciences (United States)
2022
Leibniz Association
2014
Cefak (Germany)
2004
As a part of the Scientific Committee on Oceanographic Research (SCOR) Working Group #160 “Analyzing ocean turbulence observations to quantify mixing” (ATOMIX), we have developed recommendations best practices for estimating rate dissipation kinetic energy, ε , from measurements shear using probes. The provided here are platform-independent and cover conceivable range rates in ocean, seas, other natural waters. They applicable commonly deployed platforms that include vertical profilers,...
Abstract Recent results from a tracer release experiment have shown that, similar to many lakes and ocean basins, deep‐water mixing in the Baltic Sea is largely determined by processes occurring energetic near‐bottom region. Due complexity small vertical extent of this region, however, previous modeling studies so far not been able provide numerically physically sound representation boundary mixing. Here we discuss first nested high‐resolution simulation central that aims at realistic...
Abstract Recently discovered, ocean submesoscales have attracted considerable attention due to their ability change the upper stratification, affect vertical transport, and induce a downscale cascade of energy toward dissipation. In this paper, we highlight effect submesoscale fronts filaments on surface layer properties dynamics during storm events, extending previous idealized simulations real‐ocean applications. Here, use Baltic Sea as natural laboratory study rich activity system with...
In this study, results from the Baltic Sea Tracer Release Experiment (BATRE) are described, in which deep water mixing rates and processes central were investigated. September 2007, an inert tracer gas (CF 3 SF 5 ) was injected at approximately 200 m depth Gotland Basin, subsequent spreading of observed during six surveys until February 2009. These data describe diapycnal lateral a stagnation period without any significant renewal due to inflow events. As one main results, vertical found...
Abstract We show that inflows of oxygenated waters into sulfidic layers have a strong impact on biogeochemical transformation at oxic/anoxic transition zones. Taking the pelagic methane dynamics in Gotland Basin as an example, we performed our studies when one largest ever recorded entered Baltic Sea March 2015. An inflowing gravity current transported oxic deep and freshly generated near‐bottom secondary redox interface. At upper slope, where water masses were vigorously turbulent main...
Deep water mixing processes in the largest basin of Baltic Sea (Gotland Basin) are investigated here with help long‐term moored instrumentation and turbulence microstructure measurements. Budgets for heat salinity reveal a strong temporal variability deep coefficients that is shown to be coupled wind forcing down time scales individual events. Consistent results from simultaneously conducted tracer release experiment, near‐boundary was identified as key basin‐scale mixing. Turbulent bottom...
Abstract Intrusions of large amounts dense and oxygen‐rich waters during so‐called Major Baltic Inflows (MBIs) form an essential component the Sea overturning circulation deepwater ventilation. Despite their importance, however, detailed observations processes occurring in central basins MBI are virtually lacking. Here data from a long‐term deployment autonomous profiling platform located center one main presented, providing first direct view modifications dynamics induced by largest MBIs...
In lakes and reservoirs, physical processes control temperature dynamics stratification, which are important determinants of water quality. large lakes, even extensive monitoring programs leave some the patterns undiscovered unresolved. Lake models can complement measurements in higher spatial temporal resolution. These require a set driving data, particularly meteorological input compulsory to but at many locations not available desired scale or It remains an open question whether these...
Abstract Based on high-resolution turbulence microstructure and near-surface velocity data, frontal instability its relation to are investigated inside a transient upwelling filament in the Benguela system (southeast Atlantic). The focus of our study is sharp submesoscale front located at edge filament, characterized by persistent downfront winds, strong jet, vigorous turbulence. Our analysis reveals three distinct stability regimes. (i) On light side front, 30–40-m-deep turbulent surface...
Abstract Processes of stratification and destratification in the German Bight region fresh water influence (ROFI) are investigated following an extreme river discharge event June 2013. For this purpose, a high‐resolution baroclinic ocean model is set up validated against field data. The results used to study temporal spatial variability duration persistent relevant processes affecting by analyzing potential energy anomaly budget, with focus on mixing tidal straining. It shown that highly...
Abstract Turbulent mixing in the ocean, lakes and reservoirs facilitates transport of momentum, heat, nutrients, other passive tracers. fluxes are proportional to rate turbulent kinetic energy dissipation per unit mass, ε . A common method for measurements is using microstructure profilers with shear probes. Such now widespread, a non-expert practitioner will benefit from best practice guidelines benchmark datasets. As part Scientific Committee on Oceanographic Research (SCOR) working group...
Coastal zones are often described as effective filters for land-derived nutrient loads, referred to the coastal filter, which applies in particular bays and estuaries with higher water residence times. Open high energy environments sediments influenced by waves currents, time is short. Most open covered permeable sandy sediments. Contrary previous assumptions despite their low organic matter content, contribute benthic nitrogen cycling oxygen dynamics. However, there a lack of understanding...
Abstract Semi‐enclosed marginal seas like the Baltic Sea are often characterized by permanently anoxic deep layers, and may therefore serve as important model systems to study causes consequences of predicted global expansion oxygen minimum zones. Here, we focus on role lateral intrusions in maintaining “hypoxic transition zone” (HTZ) Sea, which characterizes quasi‐permanent hypoxic region located between oxygenized surface layer sulfidic deep‐water region. Based long‐term deployments an...
Abstract Stratified oceanic turbulence is strongly intermittent in time and space, therefore generally underresolved by currently available situ observational approaches. A promising tool to at least partly overcome this constraint are broadband acoustic observations of turbulent microstructure that have the potential provide mixing parameters orders magnitude higher resolution compared conventional Here, we discuss applicability, limitations, measurement uncertainties approach for some...
Abstract Diapycnal mixing impacts vertical transport rates of salt, heat, and other dissolved substances, essential for the overturning circulation ecosystem functioning in marine systems. While most studies have focused on induced by individual obstacles tidal flows, we investigate net effect non‐tidal flow over multiple small‐scale (<1 km) bathymetric features penetrating a strongly‐stratified density interface coastal region. We combine high‐resolution broadband acoustic observations...
Abstract In most observations of diffusive convection in the ocean and lakes, characteristic staircases evolve over long time scales under quasi-stationary background conditions. Baltic Sea, however, develop inside flanks intermittent intrusions that induce strong inverse temperature gradients a vertical range few meters, varying on hours to days. Here, results are discussed from an extensive field campaign conducted summer 2016 southern including microstructure data gliders autonomous...
Summary Lateral intrusions of oxygen caused by small‐scale mixing are thought to shape microbial activity in marine redoxclines. To examine the response prokaryotes such events we employed a shipboard experiment euxinic central Baltic Sea: oxic, nitrate containing and sulfidic water samples without detectable oxygenized substances were incubated directly or after mixing. While nitrate, nitrite ammonium concentrations stayed approximately constant all incubations, observed decrease sulfide...
The impact of synoptic scale and mesoscale variability on the Lagrangian residence time (LRT) surface water in Bay Gdansk was investigated using results from an eddy-resolving model. computed LRT 53–60 days up to four times longer than estimated flushing reported by Witek et al. (2003). highest were those Puck near coast, below 50 m depth, especially during winter. These sites also had annual mean LRT. During summer, when level biological activity is high, distribution very heterogeneous...
Results from measurements are presented that were collected during a full tidal cycle in the Ems estuary, involving two landers and an anchored research vessel. The conditions characterized by very weak winds, no wave effects, low river run-off, so state was close to tide-only. We find lateral (i.e., cross-slope) transport of water suspended particulate matter (SPM) much time shows vertically layered structure, which is however subject sudden transitions. Moreover, even on small spatial...