Fredrik Wulff - Academia.edu (original) (raw)

Papers by Fredrik Wulff

Research paper thumbnail of Sediment-water Nutrient Fluxes in the Gulf of Finland, Baltic Sea

Estuarine, Coastal and Shelf Science, 1997

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Research paper thumbnail of Modelling regional and large-scale response of Baltic Sea ecosystems to nutrient load reductions

Biological, Physical and Geochemical Features of Enclosed and Semi-enclosed Marine Systems, 1999

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Research paper thumbnail of Searching Efficient Protection Strategies for the Eutrophied Gulf of Finland: The Combined Use of One-Dimensional and Three Dimensional Modeling in Assessing Long-Term State Scenarios with High Spatial Resolution

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Research paper thumbnail of State of the Gulf of Bothnia today and in the future

ABSTRACT Skärgård, ISSN 0356-9381, vol. 1, 67-87

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Research paper thumbnail of Omsättning av närsalter i Bottniska viken 1991 = Nutrient dynamics in the Gulf of Bothnia, 1991

Vatten, ISSN 0042-2886, vol. 50, nr. 3, 220-230 Based on the intensive hydrochemical measurements... more Vatten, ISSN 0042-2886, vol. 50, nr. 3, 220-230 Based on the intensive hydrochemical measurements during the Gulf of Bothnia Year 1991, we present descriptions of the regional variations of freshwater and nutrient inputs and hydrographic and nutrient conditions in the basins for this particular year. These data are then used to construct budgets of silicate, inorganic and organic nitrogen and phosphorus for the Bothnian Sea and Bay. The variations of internal sources and sinks and advective transports between the basins and with the Baltic proper show the relative importance and magnitude of biogeochemical and physical processes for the development of nutrient concentrations in these basins. Annual budget estimates show that the Bothnian Sea appears to function as a very efficient sink for nitrogen. There is a very small exchange of nitrogen with the Baltic proper, in contrast to the large amounts of phosphorus imported and silica exported. Overall N/P ratios show the high rates typ...

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Research paper thumbnail of Management optioNS AND EFFECTS ON A MARINE ECOSYSTEM: ASSESSING THE FUTURE OF THE BALTIC

We are using the coupled models of decision support system NEST, to evaluate the response of the ... more We are using the coupled models of decision support system NEST, to evaluate the response of the marine ecosystem to changes in external loads through various management options. The models address all the seven major marine basins and the entire drainage basin. A series of future scenarios have been developed, in close collaboration with HELCOM, to see the possible effects

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Research paper thumbnail of A model for the dynamics of nutrients and oxygen in the Baltic proper

Journal of Marine Research, 1987

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Research paper thumbnail of Long-term, seasonal and spatial variations of nitrogen, phosphorus and silicate in the Baltic: An overview

Marine Environmental Research, 1988

... Variations of nitrogen, phosphorus and silicate in the Baltic 25 central station in the easte... more ... Variations of nitrogen, phosphorus and silicate in the Baltic 25 central station in the eastern Gothland Basin may well describe the average conditions. RESULTS In order to describe typicalseasonal and spatial distribution patterns, the interpolated monthly surface (0-5 m) mean ...

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Research paper thumbnail of Sediment-water oxygen and nutrient exchanges along a depth gradient in the Baltic Sea

Marine Ecology Progress Series, 1990

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Research paper thumbnail of Time series analysis of nutrient inputs to the Baltic Sea and changing DSi:DIN ratios

Marine Ecology Progress Series, 1996

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Research paper thumbnail of Using parallel salinity and temperature profiles for calculations of estuarine fluxes with reference to the baltic proper

Netherlands Journal of Sea Research, 1992

ABSTRACT A diagnostic advection-diffusion equation system in a ‘natural coordinate’ frame of refe... more ABSTRACT A diagnostic advection-diffusion equation system in a ‘natural coordinate’ frame of reference is investigated in order to improved its robustness. The dependence of the leading-order solutions on higher-order features of the hydrographic data has been decreased and a differential equation with and analytical solution is obtained. The properties of the lowest-order equation are compared with previous studies where the undegenerated equations were used to estimate the distribution of both the diapycnal salt flux and the oxygen consumption within the Baltic proper. The agreement found is within the acceptable bounds. Finally a pilot study of a silicate budget of the Baltic proper has been performed.

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Research paper thumbnail of Carbon flows in Baltic Sea food webs — a re-evaluation using a mass balance approach

Journal of Marine Systems, 2000

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Research paper thumbnail of Nitrogen fixation in the Baltic proper: an empirical study

Journal of Marine Systems, 2000

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Research paper thumbnail of The Baltic Sea a century ago — a reconstruction from model simulations, verified by observations

Journal of Marine Systems, 2008

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Research paper thumbnail of Nutrient Reductions to the Baltic Sea: Ecology, Costs and Benefits

Journal of Environmental Management, 1997

The environmental conditions of the Baltic Sea have been of concern for approximately the last th... more The environmental conditions of the Baltic Sea have been of concern for approximately the last three decades. In spite of this concern, the Sea is far from being in good ecological condition. One important reason may be the lack of an overview of costs and benefits associated with the pollution reductions needed for the restoration of the Sea. The purpose

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Research paper thumbnail of Long-term modeling of large-scale nutrient cycles in the entire Baltic Sea

Hydrobiologia, 2009

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Research paper thumbnail of A time-dependent budget model for nutrients in the Baltic Sea

Global Biogeochemical Cycles, 1989

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Research paper thumbnail of Sediment-water Nutrient Fluxes in the Gulf of Finland, Baltic Sea

Estuarine, Coastal and Shelf Science, 1997

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Research paper thumbnail of Adsorption capacity of phosphorus in Baltic Sea sediments

Estuarine, Coastal and Shelf Science, 1989

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Research paper thumbnail of Non-parametric trend test of baltic sea data

Environmetrics, 1991

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Research paper thumbnail of Sediment-water Nutrient Fluxes in the Gulf of Finland, Baltic Sea

Estuarine, Coastal and Shelf Science, 1997

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Modelling regional and large-scale response of Baltic Sea ecosystems to nutrient load reductions

Biological, Physical and Geochemical Features of Enclosed and Semi-enclosed Marine Systems, 1999

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Searching Efficient Protection Strategies for the Eutrophied Gulf of Finland: The Combined Use of One-Dimensional and Three Dimensional Modeling in Assessing Long-Term State Scenarios with High Spatial Resolution

Bookmarks Related papers MentionsView impact

Research paper thumbnail of State of the Gulf of Bothnia today and in the future

ABSTRACT Skärgård, ISSN 0356-9381, vol. 1, 67-87

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Omsättning av närsalter i Bottniska viken 1991 = Nutrient dynamics in the Gulf of Bothnia, 1991

Vatten, ISSN 0042-2886, vol. 50, nr. 3, 220-230 Based on the intensive hydrochemical measurements... more Vatten, ISSN 0042-2886, vol. 50, nr. 3, 220-230 Based on the intensive hydrochemical measurements during the Gulf of Bothnia Year 1991, we present descriptions of the regional variations of freshwater and nutrient inputs and hydrographic and nutrient conditions in the basins for this particular year. These data are then used to construct budgets of silicate, inorganic and organic nitrogen and phosphorus for the Bothnian Sea and Bay. The variations of internal sources and sinks and advective transports between the basins and with the Baltic proper show the relative importance and magnitude of biogeochemical and physical processes for the development of nutrient concentrations in these basins. Annual budget estimates show that the Bothnian Sea appears to function as a very efficient sink for nitrogen. There is a very small exchange of nitrogen with the Baltic proper, in contrast to the large amounts of phosphorus imported and silica exported. Overall N/P ratios show the high rates typ...

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Management optioNS AND EFFECTS ON A MARINE ECOSYSTEM: ASSESSING THE FUTURE OF THE BALTIC

We are using the coupled models of decision support system NEST, to evaluate the response of the ... more We are using the coupled models of decision support system NEST, to evaluate the response of the marine ecosystem to changes in external loads through various management options. The models address all the seven major marine basins and the entire drainage basin. A series of future scenarios have been developed, in close collaboration with HELCOM, to see the possible effects

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Research paper thumbnail of A model for the dynamics of nutrients and oxygen in the Baltic proper

Journal of Marine Research, 1987

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Long-term, seasonal and spatial variations of nitrogen, phosphorus and silicate in the Baltic: An overview

Marine Environmental Research, 1988

... Variations of nitrogen, phosphorus and silicate in the Baltic 25 central station in the easte... more ... Variations of nitrogen, phosphorus and silicate in the Baltic 25 central station in the eastern Gothland Basin may well describe the average conditions. RESULTS In order to describe typicalseasonal and spatial distribution patterns, the interpolated monthly surface (0-5 m) mean ...

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Research paper thumbnail of Sediment-water oxygen and nutrient exchanges along a depth gradient in the Baltic Sea

Marine Ecology Progress Series, 1990

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Research paper thumbnail of Time series analysis of nutrient inputs to the Baltic Sea and changing DSi:DIN ratios

Marine Ecology Progress Series, 1996

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Research paper thumbnail of Using parallel salinity and temperature profiles for calculations of estuarine fluxes with reference to the baltic proper

Netherlands Journal of Sea Research, 1992

ABSTRACT A diagnostic advection-diffusion equation system in a ‘natural coordinate’ frame of refe... more ABSTRACT A diagnostic advection-diffusion equation system in a ‘natural coordinate’ frame of reference is investigated in order to improved its robustness. The dependence of the leading-order solutions on higher-order features of the hydrographic data has been decreased and a differential equation with and analytical solution is obtained. The properties of the lowest-order equation are compared with previous studies where the undegenerated equations were used to estimate the distribution of both the diapycnal salt flux and the oxygen consumption within the Baltic proper. The agreement found is within the acceptable bounds. Finally a pilot study of a silicate budget of the Baltic proper has been performed.

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Carbon flows in Baltic Sea food webs — a re-evaluation using a mass balance approach

Journal of Marine Systems, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nitrogen fixation in the Baltic proper: an empirical study

Journal of Marine Systems, 2000

Bookmarks Related papers MentionsView impact

Research paper thumbnail of The Baltic Sea a century ago — a reconstruction from model simulations, verified by observations

Journal of Marine Systems, 2008

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Nutrient Reductions to the Baltic Sea: Ecology, Costs and Benefits

Journal of Environmental Management, 1997

The environmental conditions of the Baltic Sea have been of concern for approximately the last th... more The environmental conditions of the Baltic Sea have been of concern for approximately the last three decades. In spite of this concern, the Sea is far from being in good ecological condition. One important reason may be the lack of an overview of costs and benefits associated with the pollution reductions needed for the restoration of the Sea. The purpose

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Long-term modeling of large-scale nutrient cycles in the entire Baltic Sea

Hydrobiologia, 2009

Bookmarks Related papers MentionsView impact

Research paper thumbnail of A time-dependent budget model for nutrients in the Baltic Sea

Global Biogeochemical Cycles, 1989

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Sediment-water Nutrient Fluxes in the Gulf of Finland, Baltic Sea

Estuarine, Coastal and Shelf Science, 1997

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Adsorption capacity of phosphorus in Baltic Sea sediments

Estuarine, Coastal and Shelf Science, 1989

Bookmarks Related papers MentionsView impact

Research paper thumbnail of Non-parametric trend test of baltic sea data

Environmetrics, 1991

Bookmarks Related papers MentionsView impact