A5051683564- Oceanographic and Atmospheric Processes
- Marine and coastal ecosystems
- Marine and fisheries research
- Arctic and Antarctic ice dynamics
- Ocean Waves and Remote Sensing
- Methane Hydrates and Related Phenomena
- Marine Biology and Ecology Research
- Geology and Paleoclimatology Research
- Tropical and Extratropical Cyclones Research
- Climate variability and models
- Geological formations and processes
- Microbial Community Ecology and Physiology
- Isotope Analysis in Ecology
- Coastal wetland ecosystem dynamics
- Geological Studies and Exploration
- Coastal and Marine Management
- Marine and environmental studies
- Geophysics and Gravity Measurements
- Offshore Engineering and Technologies
- Soil and Water Nutrient Dynamics
- Fish Ecology and Management Studies
- Atmospheric and Environmental Gas Dynamics
- Cryospheric studies and observations
- Aquatic and Environmental Studies
- Geological and Geophysical Studies
Leibniz Institute for Baltic Sea Research
2016-2025
University College London
2022
Centre for Polar Observation and Modelling
2022
GEOMAR Helmholtz Centre for Ocean Research Kiel
2008
NOAA Pacific Marine Environmental Laboratory
2008
National Oceanic and Atmospheric Administration
2008
Scripps Institution of Oceanography
2008
University of Rostock
2006
Oxygen-poor waters occupy large volumes of the intermediate-depth eastern tropical oceans. conditions have far-reaching impacts on ecosystems because important mobile macroorganisms avoid or cannot survive in hypoxic zones. Climate models predict declines oceanic dissolved oxygen produced by global warming. We constructed 50-year time series dissolved-oxygen concentration for select regions augmenting a historical database with recent measurements. These reveal vertical expansion low-oxygen...
Abstract The index of the North Atlantic Oscillation, dominant mode climatic variability in region, changed late 1980s (1987–1989) from a negative to positive phase. This led regime shifts ecology Sea (NS) and central Baltic (CBS), which involved all trophic levels pelagial these two neighbouring continental shelf seas. Increasing air sea surface temperatures, affected critical physical biological processes, were main direct indirect driving forces. After 1987, phytoplankton biomass both...
The ecological state of the Baltic Sea depends crucially on sufficiently frequent, strong deep water renewal periodic events by inflow oxygen rich saline from North Sea. Due to density stratification these inflows are only source for ventilation. Since early eighties last century frequency has dropped drastically 5 7 major per decade one decade. Wide spread anoxic conditions became usual in central Baltic. rare (MBI) 1993 and 2003 could interrupt bottom temporarily. After more than 10 years...
Abstract. Based on the Baltic Earth Assessment Reports of this thematic issue in System Dynamics and recent peer-reviewed literature, current knowledge effects global warming past future changes climate Sea region is summarised assessed. The study an update Second Climate Change (BACC II) published 2015 focuses atmosphere, land, cryosphere, ocean, sediments, terrestrial marine biosphere. summaries gained palaeo-, historical, regional research, we find that main conclusions from earlier...
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,...
Major Baltic inflow events (MBI) transport large amounts of saline water into the Baltic. They are solely source for deep ventilation in central basins, and control to a extent environmental conditions below permanent halocline. Available series MBI frequency intensity depict strong decrease after 1980ies, followed by long lasting stagnation periods basins. However, expected mean salinity was not observed. Also volume changes has changed, recent model studies predict slight increase with...
Emerging understanding of the variability natural coastal hypoxia is divided between two main hypotheses: biogeochemical oxygen demand linked to locally‐driven organic matter decay or supply low‐oxygen waters by physical processes. The precise role either mechanism in triggering has remained elusive. A combined methane and high resolution year‐long hourly data time series a upwelling system suggests that these systems may be responding complex interaction two. show how anoxia initially...
Abstract We report on methane enrichments that were observed during summer in the upper water column of Gotland Basin, central Baltic Sea. In eastern part basin, concentrations just below thermocline varied between 15 nM and 77 nM, contrast to western where no could be detected. Stable carbon isotope ratios ( δ 13 C‐CH 4 −67.6‰) indicated its situ biogenic origin from CO 2 reduction, which was supported by clonal sequences clustered with Methanomicrobiaceae , a family methanogenic Archaea....
Abstract In December 2014, an exceptional inflow event into the Baltic Sea was observed, a so‐called Major Inflow (MBI). Such events are important for deep water ventilation in and typically occur every 3–10 years. Based on first observational data sets, this had been ranked as third largest since 100 With help of multinested modeling system, reaching from North Atlantic (8 km resolution) to Western (600 m resolution, which is baroclinic eddy resolving), reproduced detail. The model gave...
Abstract Fungi are ubiquitous in the ocean and hypothesized to be important members of marine ecosystems, but their roles carbon cycle poorly understood. Here, we use 13C DNA stable isotope probing coupled with phylogenetic analyses investigate assimilation within diverse communities planktonic benthic fungi Benguela Upwelling System (Namibia). Across redox stratified water column underlying sediments, 13C-labeled from diatom extracellular polymeric substances (13C-dEPS) by correlated...
Abstract The northern Benguela upwelling system is a nutrient‐replete region with high plankton biomass production and seasonally changing oxygen minimum zone. Nitrate:phosphate ratios in fresh water are low due to denitrification the near‐seafloor zone phosphate efflux from sediments. This makes candidate for substantial dinitrogen fixation, which evidence scarce. Nutrient data, N isotope data of nitrate, nitrogen particulate matter, organic carbon content, suspended matter concentrations...