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PI: Isolde Puts
Taking primary production measurements in lakes around Ekträsk using net and solar radiation from Svartberget. These measurements are part of a survey investigating pelagic primary production in a DOC gradient.
The project aims to increase the understanding of hydrological processes and transport in the surface and subsurface system under different climate conditions. We aim to develop a coupled hydrological-biogeochemical transport model that we can use to investigate different sites under different climate conditions. A coupled model describing solute transport at a landscape level will provide valuable information to the development of biosphere models. The impact on transport and biogeochemical processes in the landscape caused by differences in hydrology and climate are vital to get a better understanding of, especially when conceptualizing the ecosystem models used for radionuclide transport and dos-calculations. Nevertheless, the understanding of how and if a conceptual model of an eco-system needs to be changed in different climate scenarios is limited. One aim of this project is to identify conceptual differences in transport and accumulation of matter within and between eco-system under changing climate states.
PI: Jan Karlsson
The aim of the project is to assess the effect of forestry on the GHG emission from boreal streams. We will test hypothesis that forestry has major impacts on stream GHG emissions over the full forest rotation cycle but also that the effects vary depending on forest management practices and variability in climatic conditions.
What is the effect of climate change on water quality in boreal and temperate catchments? Studying water transit times in long time-series and their coupling to biogeochemical processes
In this project, we will have the unique opportunity to integrate state-of-the-art estimates of catchment transit time with a wealth of existing and ongoing stream monitoring data to determine how hydrological transit time variation shape stream biogeochemical patterns within drainage networks. The combination of hydrological modeling, stream chemistry monitoring, and isotopic analysis will provide a powerful opportunity to advance our understanding of how catchments function as biogeochemical units.
PI: Emma Kritzberg
This is a project that will exploit moitoring data of chemistry in headwater streams and soil profiles to explore how trends of increasing Fe concentations in streams vary with dominating land cover and which factors may drive these trends. In addition, detailed analyses of Fe speciation in soil soil water and streams is planned.
PI: Emma Lindborg
CatchNet (Catchment transport and Cryo-hydrology Network) aims at advancing our understanding of hydrological and biogeochemical transport processes for a range of cold-climate conditions in the context of long-term, deep geological disposal of spent nuclear fuel.The aim with CatchNet is to involve several nuclear waste organisations and academic research groups in an effort to bridge both the industrial and academic worlds. The main focus of this activity is hydrology in the periglacial landscape even though the coupling to other hydrological features, such as the ice and the sub-glacial water system are important in order to conceptualize the periglacial hydrological system. There is also a close coupling with biogeochemistry related to transport of elements in the periglacial system, where hydrology is one of the main drivers
PI: Martin Berggren
Anthropogenic drivers lead to unwanted loading of nutrients to freshwater and marine ecosystems, potentially causing eutrophication and loss of biodiversity and fish stocks. The ability to predict these ecological responses is limited by the current understanding of nutrient bioavailability, i.e. the degree to which nutrients can be assimilated by biota. Traditionally, coastal water management has focused on inorganic nutrients, but recent evidence suggests that also organic forms of nitrogen (N) and (P), especially in the form of brown-pigmented organic compounds, can be both highly abundant and bioavailable. Scientists and managers lack the conceptual framework and toolkit required to make biologically meaningful assessments of nutrient bioavailability, necessary to understand and predict the consequences of anthropogenic loading to aquatic habitats. We here apply a new, simple, and inexpensive tool to simultaneously determine N, P and organic carbon bioavailability in surface waters. We use this tool to characterize patterns of bioavailable nutrient loading from land, and to explain spatial and temporal variability in nutrient limitation of primary production and bacterioplankton production in inland and coastal waters. We also address the physical transformation of bioavailable organic nutrients that happens in the mixing zone between fresh and salt water.