A5025229696- Oceanographic and Atmospheric Processes
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Ocean Waves and Remote Sensing
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Geological Studies and Exploration
- Arctic and Antarctic ice dynamics
- Microbial Community Ecology and Physiology
- Fish Ecology and Management Studies
- Marine Biology and Ecology Research
- Geology and Paleoclimatology Research
- Marine and fisheries research
- Peatlands and Wetlands Ecology
- Geological and Geochemical Analysis
- Cryospheric studies and observations
- Tropical and Extratropical Cyclones Research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Aquatic and Environmental Studies
- Groundwater and Isotope Geochemistry
- Climate variability and models
- Geological formations and processes
- Underwater Acoustics Research
- Marine and Offshore Engineering Studies
- Hydrological Forecasting Using AI
University of Gothenburg
2006-2022
In a 2.5-year-long environmental engineering experiment in the By Fjord, surface water was pumped into deepwater where frequency of renewals increased by factor 10. During experiment, became long-term oxic, and nitrate dominating dissolved inorganic nitrogen component. The amount phosphate column decreased 5 due to increase flushing reduction leakage from sediments when sediment oxidized. Oxygenation did not toxic metals organic pollutants. bacterial community first show changes after...
The external phosphorus (P) loading has been halved, but the P content in water column and area of anoxic bottoms Baltic proper increased during last 30 years. This can be explained by a temporary internal source dissolved inorganic (DIP) that is turned on when above bottom sediment becomes anoxic. A load-response model, explaining evolution from 1980 to 2005, suggests average specific DIP flux about 2.3 g m−2 year−1. commensurable with fluxes estimated situ open hydrographic data deep part...
Palsas are a permafrost landform found in northern peatlands, characterized by peat mounds with frozen core. Climatic changes cause widespread degradation of palsas, affecting biodiversity, hydrology, carbon fluxes, and local infrastructure. Therefore, palsa mires considered priority habitat under the EU Species Habitat Directive integrated into Sweden’s environmental goals, such as maintaining Thriving Wetlands. Despite their threatened status, largest coherent mire Sweden,...
Profiles of dissipation rates and stratification between 10 120 m depth were measured with a loosely tethered profiler over 9‐day winter period in the Gotland Basin Baltic Sea. Supplementary measurements current profiles made moored ADCPs. Temporal spatial patterns observed by means towed CTD. Shallow freshwater lenses surface mixed layer, mesoscale eddies, inertial oscillations, waves as part internal wave spectrum provided marine physical environment for small‐scale turbulence. Two...
The submarine tufa columns of Ikka Fjord in Southwest Greenland have been studied during multiple field campaigns since 1995. fjord contains close to thousand previously shown consist the metastable carbonate mineral ikaite (CaCO3·6H2O), which requires near-freezing conditions remain stable over longer periods time. During a campaign summer 2019, seawater temperatures 6–9 °C and visual physical changes were observed. These are highest recorded measured three decades research. In response,...
The Baltic Sea Experiment (BALTEX) is one of the five continental-scale experiments Global Energy and Water Cycle (GEWEX). More than 50 research groups from 14 European countries are participating in this project to measure model energy water cycle over large drainage basin northern Europe. BALTEX aims provide a better understanding processes climate system improve validate regional numerical models for weather forecasting studies. A major effort undertaken couple interactively atmosphere...
It has earlier been hypothesized that the deep water flowing into Baltic Sea forms a bottom pool in Arkona Sea, just inside entrance sills. The flow from farther was assumed to be baroclinic geostrophic and controlled by stratification. This supported realistic statistical description of deepwater computed using historical vertical density profiles hydrographical station Sea. However, basin‐wide synoptic measurements currents were not available for direct verification model. A hydrographic...
Field-based thermal infrared cameras provide surface temperature information at very high spatial and temporal resolution could complement existing phenological camera spectral sensor networks. Since is one of the main drivers ecosystem respiration (ER), field-based offer a new opportunity to model upscale ER in unprecedented detail. We present such an approach based on manual chamber CO2 flux measurements imagery from tower-based Unmanned Aerial Vehicle (UAV) flights. Data were collected...
We obtained high‐resolution data on a deep‐water renewal in the basin of Gullmar Fjord, Sweden, using an autonomous profiling platform. In middle fjord, where platform is anchored, starts with passage gravity current front and continues steady thickening new, oxygen‐rich, low‐nitrate bottom layer associated lifting old, oxygen‐depleted, high‐nitrate water. The continuously fills to sill level during period 10 d. At mouth three‐layer structure develops. Renewal driven by density difference...
Internal seiche motions with period 1–3 days in Gullmar Fjord are investigated based on mooring data high vertical and time resolution. The structure of the internal seiches well described by a simple analytical three-layer model taking into account blocking basin water at sill. Energy budgets for forcing damping estimated. forced direct wind stress surface coastal waves frequency close to seiches, latter contribution being little larger. e-folding timescale is approximately equal periods,...
We use data from a CTD plume‐mapping campaign conducted during the Arctic Gakkel Vents (AGAVE) expedition in 2007 to constrain nature of hydrothermal processes on Ridge at 85°E. Thermal and redox potential ( Eh ) anomalies were detected two discrete depth intervals: 2400–2800 m (Interval 1) 3000–3800 2). The spatial temporal patterns signals indicate that Interval 1 most likely generated by single large, high‐temperature (T > 100°C) vent field located fault terraces form NE axial valley...
Abstract This study investigates the dissipation rates and flow conditions at Drøbak Sill in Oslofjord. The area was transected 13 times with a free-falling microstructure shear probe during 4 days June 2011. At same time, an ADCP deployed inside sill. During most tidal cycles, internal hydraulic jumps high were found on downstream side of However, response varied strongly between different cycles similar barotropic forcing. In beginning observational period, ebb tides had no jumps, end one...
The mixing in the basin water (the below sill level) of Gullmar Fjord has been investigated with main focus on contribution from internal seiches. A companion paper reports evidence for dissipation seiche energy after near-critical reflection bottom. In present magnitude and variation is investigated, using budget method. results are related to variations three sources, namely (i) seiches, (ii) tides, (iii) waves generated by external seiche. efficiency, defined as irreversible work against...
Abstract For aquatic scientists mesocosm experiments are important tools for hypothesis testing as they offer a compromise between experimental control and realism. Here we present new infrastructure—SITES AquaNET—located in five lakes connected to field stations Sweden that cover ~760 km latitudinal gradient. SITES AquaNet overcomes major hindrances research through: (i) openness the scientific community, (ii) potential implement coordinated across sites time, (iii) high‐frequency...
Two microstructure profilers, two ships, and four moorings with acoustic Doppler current profilers conductivity–temperature loggers were used in an intensive effort to map the spatial temporal variations of vertical mixing stagnant deep basin Gullmar Fjord, Sweden. During three days beginning August 2001 a continuous time series turbulent kinetic energy dissipation profiles was obtained one profiler at fixed position near deepest part fjord. same period other obtain six sections through...
Abstract. Observations of velocity, pressure, temperature and salinity in the inner Oslofjord have been analysed to provide new information about relationships between internal tides generated by tidal currents across Drøbak Sill dissipation diffusivity fjord. The most energetic vertical displacement density surfaces inside sill is associated with first mode that has maximum amplitude around depth. depth correlates surface elevation, and, at a distance 1 km sill, ratio amplitudes 38,...
Abstract Dissipation time series and moored velocity density on the inner slopes of Gullmar Fjord sill showed that internal tides generated at radiated to head fjord, were reflected, then back sill, where they dissipated their energy mainly below level. A large amount dissipation was caused by a transitional flow particular phase tide, when bottom layer descended down slope had pass constriction set up submarine hill. The inward, baroclinic bottom-layer transformed into supercritical jet,...