Anette Jönsson - Academia.edu (original) (raw)

Papers by Anette Jönsson

The wave field in the Baltic Sea has been modelled for a two-year period with the spectral wave m... more The wave field in the Baltic Sea has been modelled for a two-year period with the spectral wave model HYPAS. There is a large seasonal variation in the field and a minor annual one, both reflect th ...

I november 2019 arrangerade SMHI en workshop pa temat stigande havsnivaer. Deltog gjorde bland an... more I november 2019 arrangerade SMHI en workshop pa temat stigande havsnivaer. Deltog gjorde bland annat representanter fran nationella och internationella myndigheter, kommuner, universitet och forskn ...

This Final Report is written and compiled by the authors listed. Many other researchers have also... more This Final Report is written and compiled by the authors listed. Many other researchers have also contributed to the MIMIC project. This is reflected in the authorship of the articles, reports and presentations in which the project's results are presented (p. 52-59).

In a climate change context, changes in extreme sea-levels rather than changes in the mean are of... more In a climate change context, changes in extreme sea-levels rather than changes in the mean are of particular interest from the coastal protection point of view. In this work, extreme sea-levels in the Baltic Sea are investigated based on daily tide gauge records for the period 1916Á2005 using the annual block maxima approach. Extreme events are analysed based on the generalised extreme value distribution considering both stationary and time-varying models. The likelihood ratio test is applied to select between stationary and nonstationary models for the maxima and return values are estimated from the final model. As an independent and complementary approach, quantile regression is applied for comparison with the results from the extreme value approach. The rates of change in the uppermost quantiles are in general consistent and most pronounced for the northernmost stations.

This study compares the extent and frequency of seafloor disturbances due to anthropogenic proces... more This study compares the extent and frequency of seafloor disturbances due to anthropogenic processes (bottom trawling and dredging) with those due to wind-driven waves in the Baltic Proper. There i ...

Wave heights and periods of surface waves in the Baltic Sea have been modelled for a two-year per... more Wave heights and periods of surface waves in the Baltic Sea have been modelled for a two-year period (1999-2000) with the wave model Hypas on an 11x11-km grid scale. There is a clear seasonal varia ...

We present Nemo-Nordic, a Baltic & North Sea model based on the NEMO ocean engine. Surrounded by ... more We present Nemo-Nordic, a Baltic & North Sea model based on the NEMO ocean engine. Surrounded by highly industrialised countries, the Baltic and North seas, and their assets associated with shipping, fishing and tourism; are vulnerable to anthropogenic pressure and climate change. Ocean models providing reliable forecasts, and enabling climatic studies, are important tools for the shipping infrastructure and to get a better understanding of effects of climate change on the marine ecosystems. Nemo-Nordic is intended to come as a tool for both short term and long term simulations, and to be used for 5 ocean forecasting as well as process and climatic studies. Here, the scientific and technical choices within Nemo-Nordic are introduced, and the reasons behind the design of the model and its domain, and the inclusions of the two seas, are explained. The model's ability to represent barotropic and baroclinic dynamics, as well as the vertical structure of the water column, is presented. Biases are shown and discussed. The short term capabilities of the model are presented, and especially its capabilities to represent sea level on an hourly timescale with a high degree of accuracy. We also show that the model can 10 represent longer time scale, with a focus on the Major Baltic Inflows and the variability of deep water salinity in the Baltic Sea. tant role for biogeochemical processes as it influences primary production, the start of the spring phytoplankton bloom, and the nutrient cycling in the North Sea (

Journal of Marine Systems, Dec 1, 2006

During 28 November-5 December 1999 three storms passed the Baltic Sea area. The modelled surface ... more During 28 November-5 December 1999 three storms passed the Baltic Sea area. The modelled surface waves in the Baltic Proper during this period have been used to calculate the amount of suspended sand in the water mass. Different parameterisations depending on the flow regimes (rippled bed flow or sheet flow) have been used for the suspended sediment calculations. The study shows that the shallow areas along the eastern and southern sides of the Baltic Proper were most exposed to the wave induced resuspension during this period. The resuspension events lasted for about 6-12 h, thereafter the sediment settled again within an hour. During each low passage, about 2.5 Mton sand were suspended, releasing about 0.5•10 6 m 3 earlier trapped interstitial water. This might have a large effect on the nutrient concentrations in the water mass above these bottoms.

At the Faculty of Arts and Science at Linköping University, research and doctoral studies are car... more At the Faculty of Arts and Science at Linköping University, research and doctoral studies are carried out within broad problem areas. Research is organised in interdisciplinary research environments and doctoral studies mainly in graduate schools. Jointly, they publish the series Linköping Studies in Arts and Science. This thesis comes form the Department of Water and Environmental Studies at the Tema Institute.

In: IMEMS 2005 : The 8th International Marine Environmental Modeling Seminar. Helsinki, Finland, ... more In: IMEMS 2005 : The 8th International Marine Environmental Modeling Seminar. Helsinki, Finland, 23-25 August, 2005. Abstract Proceedings. [Helsinki], SINTEF, SYKE. P. 65. IMEMS 2005 : The 8th International Marine Environmental Modeling Seminar. Helsinki, Finland, 23-25 August, 2005

Analysis and Design of Marine Structures V, 2015

Ocean Engineering, 2003

The surface waves in the Baltic Sea are hindcast with the spectral wave model HYPAS during a 12-m... more The surface waves in the Baltic Sea are hindcast with the spectral wave model HYPAS during a 12-month period. The model results show a strong temporal and spatial variation in the wave field due to the physical dimensions of the different basins and the predominant wind field. The highest waves in the area are found in the outer part of

Journal of Sea Research, 2007

Waves induce resuspension of surface sediments and contribute to the long-term mobilisation of pa... more Waves induce resuspension of surface sediments and contribute to the long-term mobilisation of particulate matter from erosion to accumulation bottoms. This has a major impact on the nutrient cycle in shallow seas by enhancing degradation, microbial production and recycling. The Baltic Sea represents such an area. The aim of this work is to analyse the spatial and temporal resuspension patterns

Journal of Marine Systems, 2000

Nitrogen as the limiting nutrient for primary production in the eutrophic Baltic proper has been ... more Nitrogen as the limiting nutrient for primary production in the eutrophic Baltic proper has been under debate. Based on only a limited number of actual measurements, nitrogen fixation has been assumed to be the only significant internal nitrogen source. It is then assumed that about one fifth of the net nitrogen load to the Baltic proper comes from nitrogen Ž . fixation by cyanobacteria. An alternative or additional source is utilisation of dissolved organic nitrogen DON .

Continental Shelf Research, 2005

Surface waves play an important role for the sediment distribution in the shallow Baltic Sea. Thi... more Surface waves play an important role for the sediment distribution in the shallow Baltic Sea. This paper presents the large-scale spatio-temporal distribution of wave-induced bottom friction velocity, u Ã ; based on modelled wave data for the years 1999 and 2000. The highest values of u Ã are found along the eastern coasts of the Baltic Proper and Bothnian Sea-areas characterised by long fetches for the dominant winds. Temporally, the dynamics follow that of the wind climate with higher velocities during winter and lower during summer.

... Abstract. In: 4th EuroGOOS Conference : European operational Oceanography: present and future... more ... Abstract. In: 4th EuroGOOS Conference : European operational Oceanography: present and future. 6-9 June 2005, Brest Frannce : Abstracts. Brest, Institut français de recherche pour l'exploitation de la mer (IFREMER). P. 180.. ...