Sam Fredriksson
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View article: Response of a semi-enclosed sea to perturbed freshwater and open ocean salinity forcing
Response of a semi-enclosed sea to perturbed freshwater and open ocean salinity forcing Open
The sensitivity of Baltic Sea salinities to changed fresh water forcing and other forcing factors have been debated during the last decades, since changed salinities would have large impacts on the marine ecosystems, and since this paramet…
View article: Response of a semi-enclosed sea to perturbed freshwater and open ocean salinity forcing
Response of a semi-enclosed sea to perturbed freshwater and open ocean salinity forcing Open
The sensitivity of Baltic Sea salinities to changed fresh water forcing and other forcing factors have been debated during the last decades, since changed salinities would have large impacts on the marine ecosystems, and since this paramet…
View article: Dispersal of invasive species larvae within the Orust-Tjörn fjord system
Dispersal of invasive species larvae within the Orust-Tjörn fjord system Open
The Orust-Tjörn fjord system is located on the west coast of Sweden and consists of several fjords connected by shallow and narrow straits. It is home to nature reserves, harbors, leisure areas, and aquaculture farms, and biodiversity is t…
View article: Effects of climate change on future environment and marine life in the Nordic sea areas
Effects of climate change on future environment and marine life in the Nordic sea areas Open
The report provides new knowledge on the effects of climate change on future environment and marine life in the Nordic sea areas. The United Nations’ Intergovernmental Panel on Climate Change (IPCC) provides a lot of high-quality informati…
View article: Validation of the coupled physical–biogeochemical ocean model NEMO–SCOBI for the North Sea–Baltic Sea system
Validation of the coupled physical–biogeochemical ocean model NEMO–SCOBI for the North Sea–Baltic Sea system Open
The North Sea and the Baltic Sea still experience eutrophication and deoxygenation despite large international efforts to mitigate such environmental problems. Due to the highly different oceanographic frameworks of the two seas, existing …
View article: Comment on bg-2023-116
Comment on bg-2023-116 Open
Abstract. The North Sea and the Baltic Sea still experience eutrophication and deoxygenation in spite of large international efforts to mitigate such environmental problems. Due to the highly different oceanographic frameworks of the two s…
View article: Comment on bg-2023-116
Comment on bg-2023-116 Open
Abstract. The North Sea and the Baltic Sea still experience eutrophication and deoxygenation in spite of large international efforts to mitigate such environmental problems. Due to the highly different oceanographic frameworks of the two s…
View article: Validation of Actuator Line Modeling and Large Eddy Simulations of Kite-Borne Tidal Stream Turbines against ADCP Observations
Validation of Actuator Line Modeling and Large Eddy Simulations of Kite-Borne Tidal Stream Turbines against ADCP Observations Open
The representation of tidal energy in future renewable energy systems is growing. Most of the current tidal turbine designs are limited by the minimum current velocity required for efficient operation. The Deep Green (DG) is a kite-borne t…
View article: Validation of the coupled physical-biogeochemical ocean model NEMO-SCOBI for the North Sea-Baltic Sea system
Validation of the coupled physical-biogeochemical ocean model NEMO-SCOBI for the North Sea-Baltic Sea system Open
The North Sea and the Baltic Sea still experience eutrophication and deoxygenation in spite of large international efforts to mitigate such environmental problems. Due to the highly different oceanographic frameworks of the two seas, model…
View article: Experimental Validation of Numerical Simulation of Tidal Power Plants (Deep Green) using ADCP Measurements
Experimental Validation of Numerical Simulation of Tidal Power Plants (Deep Green) using ADCP Measurements Open
<p>Tidal turbines harnessing power from tidal currents, have the prospective to become an important source for renewable energy production. The tidal power plant studied here, the Deep Green, rather than being fixed like conventional…
View article: The future of Gulf of Bothnia, possible changes on salinity and currents
The future of Gulf of Bothnia, possible changes on salinity and currents Open
<p>Understanding the physical development of the Gulf of Bothnia is vital in estimating the future of the area, both for humans and nature alike.&#160;</p><p>In the SmartSea project we have made simulations of future …
View article: Modelling Deep Green tidal power plant using large eddy simulations and the actuator line method
Modelling Deep Green tidal power plant using large eddy simulations and the actuator line method Open
The Deep Green technique for tidal power generation is suitable for moderate flows which is attractive since larger areas for tidal energy generation hereby can be used. It operates typically at mid-depth and can be seen as a “flying” kite…
View article: 21st century nutrient and oxygen dynamics in the Gulf of Bothnia
21st century nutrient and oxygen dynamics in the Gulf of Bothnia Open
<p>The Gulf of Bothnia is the only sub-basin of the Baltic Sea with no serious eutrophication. However, long-term observations have shown degradation of the water quality over the past years, indicating warning signals for the future…
View article: Extreme events on Gulf of Bothnia
Extreme events on Gulf of Bothnia Open
<p>The future changes in the physical conditions in the Gulf of Bothnia can have considerable impact on various human activities in the area. In this presentation we concentrate on marine heatwaves and ice conditions. The general cha…
View article: Chemical Signaling in the Turbulent Ocean—Hide and Seek at the Kolmogorov Scale
Chemical Signaling in the Turbulent Ocean—Hide and Seek at the Kolmogorov Scale Open
Chemical cues and signals mediate resource acquisition, mate finding, and the assessment of predation risk in marine plankton. Here, we use the chemical properties of the first identified chemical cues from zooplankton together with in sit…
View article: Climate scenarios of the Gulf of Bothnia using a high-resolution regional ocean model (NEMO-SCOBI)
Climate scenarios of the Gulf of Bothnia using a high-resolution regional ocean model (NEMO-SCOBI) Open
<p>How will the Gulf of Bothnia be impacted by future climate change? A changing climate will, in addition to warming, reduce the ice-season, change the salinity, sea level, and wave and current conditions. This will in turn have imp…
View article: Estimating air-water gas transfer velocity during low wind condition with and without buoyancy
Estimating air-water gas transfer velocity during low wind condition with and without buoyancy Open
This work aims at refining the gas transfer velocity parameterization during low wind conditions with and withoutbuoyancy, to be used in regional and global climate models. This parameterization and the enhanced understanding of the smalls…
View article: Tidal power plant simulations using large eddy simulation (LES) and the actuator line method (ALM)
Tidal power plant simulations using large eddy simulation (LES) and the actuator line method (ALM) Open
The share of the renewable energy in the gobal energy mix is to be increased according to the sustainable development goals of the UN. Tidal energy can here potentially play a substantial role for the electric power generation. The tidal p…
View article: Large eddy simulation of the tidal power plant deep green using the actuator line method
Large eddy simulation of the tidal power plant deep green using the actuator line method Open
Tidal energy has the potential to provide asubstantial part of the sustainable electric power generation. Thetidal power plant developed by Minesto, called Deep Green, is anovel technology using a ‘flying’ kite with an attached turbine,mov…
View article: Surface shear stress dependence of gas transfer velocity parameterizations using <scp>DNS</scp>
Surface shear stress dependence of gas transfer velocity parameterizations using <span>DNS</span> Open
Air‐water gas‐exchange is studied in direct numerical simulations (DNS) of free‐surface flows driven by natural convection and weak winds. The wind is modeled as a constant surface‐shear‐stress and the gas‐transfer is modeled via a passive…
View article: Near-surface physics during convection affecting air-water gas transfer
Near-surface physics during convection affecting air-water gas transfer Open
The gas flux at the water surface is affected by physical processes including turbulence from wind shear, microscale wave breaking, large-scale breaking, and convection due to heat loss at the surface. The main route in the parameterizatio…
View article: An evaluation of gas transfer velocity parameterizations during natural convection using <scp>DNS</scp>
An evaluation of gas transfer velocity parameterizations during natural convection using <span>DNS</span> Open
Direct numerical simulations (DNS) of free surface flows driven by natural convection are used to evaluate different methods of estimating air‐water gas exchange at no‐wind conditions. These methods estimate the transfer velocity as a func…