A5019272540- Marine and coastal ecosystems
- Soil and Water Nutrient Dynamics
- Aquatic Ecosystems and Phytoplankton Dynamics
- Atmospheric and Environmental Gas Dynamics
- Microbial Community Ecology and Physiology
- Atmospheric chemistry and aerosols
- Climate change and permafrost
- Mercury impact and mitigation studies
- Marine Biology and Ecology Research
- Water Quality and Pollution Assessment
- Isotope Analysis in Ecology
- Hydrocarbon exploration and reservoir analysis
- Hydrology and Watershed Management Studies
- Coastal wetland ecosystem dynamics
- Oceanographic and Atmospheric Processes
- Peatlands and Wetlands Ecology
- Environmental Toxicology and Ecotoxicology
- Environmental and Industrial Safety
- Soil erosion and sediment transport
- Fish Ecology and Management Studies
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Aquatic and Environmental Studies
- Microbial Fuel Cells and Bioremediation
- Diatoms and Algae Research
Uppsala University
2015-2024
Abstract Different processes contribute to the loss or transformation of dissolved organic matter (DOM) and change DOM concentration composition systematically along inland water continuum. Substantial efforts have been made estimate importance microbial photochemical degradation for and, some extent, also losses by flocculation, whereas significance adsorption inorganic surfaces has received less attention. Hence, knowledge on possible extent adsorption, its effect loads where aquatic...
Aquatic dissolved organic matter (DOM) is a crucial component of the global carbon cycle, and extent to which DOM escapes mineralization important for transport from continents ocean. persistence strongly depends on its molecular properties, but little known about specific properties cause continuum in reactivity among different molecules. We investigated how fractions, separated according their hydrophobicity, differ biodegradability across three inland water systems. found strong negative...
Abstract The degradation and transformation of organic carbon (C) in inland waters result significant CO 2 emissions from waters. Even though most the C occurs as dissolved (DOC), studies on particulate (POC) how it influences overall reactivity transport are still scarce. We sampled 30 aquatic ecosystems following an continuum including peat surface waters, streams, rivers, lakes. report DOC POC rates, relate patterns to environmental data across these systems, present qualitative changes...
Fluorescence is an easily available analytical technique used to assess the optical characteristics of dissolved organic matter (DOM). Despite widespread use, there has been some confusion about how robust fluorescence spectroscopy differences in solution pH. Here we three natural water samples and one commercially standard (Nordic Reservoir) by modifying pH across a range from 3.5 9.0 at 0.5 increments. We two statistical approaches if intensity shifted significantly this range. identified...
Abstract. Sunlight induces photochemical mineralisation of chromophoric dissolved organic matter (CDOM) to inorganic carbon (DIC) in inland waters, resulting dioxide (CO2) emissions the atmosphere. Photochemical rate modelling is used determine sunlight-induced CO2 on large spatial and temporal scales. A sensitive model parameter wavelength-specific CDOM reactivity, apparent quantum yield (AQY). However, variability AQY spectra within waters remains poorly constrained. Here, we studied a...
Abstract Inland waters receive and process large amounts of colored organic matter from the terrestrial surroundings. These inputs dramatically affect chemical, physical, biological properties water bodies, as well their roles global carbon sinks sources. However, manipulative studies, especially at ecosystem scale, require dissolved with optical chemical resembling indigenous matter. Here, we compared impacts two leonardite products (HuminFeed SuperHume) a freshly derived reverse osmosis...
Abstract Transparent exopolymer particles (TEP) are ubiquitous in aquatic ecosystems and contribute, for example, to sedimentation of organic matter oceans freshwaters. Earlier studies indicate that the formation TEP is related situ activity phytoplankton or bacteria. However, terrestrial sources precursors usually not considered. We investigated concentration its driving factors boreal freshwaters, hypothesizing can enter freshwaters via inputs. In a field survey, we measured concentrations...
Abstract Photochemical degradation of dissolved organic matter (DOM) has been the subject numerous studies; however, its regulation along inland water continuum is still unclear. We aimed to unravel DOM photoreactivity and concurrent compositional changes across 30 boreal aquatic ecosystems including peat waters, streams, rivers, lakes distributed a residence time (WRT) gradient. Samples were subjected standardized exposure simulated sunlight. measured apparent quantum yield (AQY), which...
Abstract. Sunlight induces photochemical mineralisation of chromophoric dissolved organic matter (CDOM) to inorganic carbon (DIC) in inland waters, resulting dioxide (CO2) emissions the atmosphere. Photochemical rate modelling is used determine sunlight-induced CO2 on large spatial and temporal scales. A sensitive model parameter wavelength-specific CDOM reactivity, apparent quantum yield (AQY). The studies so far assume that AQY spectra determined for single lakes occasions represent larger...
Dissolved organic matter (DOM) is a major carbon pool and considered the most bioavailable mobile fraction of matter. DOM generally defined as passing filter pore size 0.2 or 0.45 µm, this cut off means that not only contains dissolved molecules but also colloidal objects aggregates up to few hundred nanometres. The properties fraction, such for example size, shape, surface charge, will affect its actual bioavailability mobility in environment. Although previously well studied,...
Abstract Streams and rivers form an important link in the global carbon cycle by transporting transforming large amounts of imported from terrestrial ecosystems to oceans. Since streams agricultural areas often experience increased concentrations suspended mineral particles soil erosion, they are sites where dissolved organic (DOC) may be adsorbed retained sediment. As extent adsorption varies with molecular composition matter (DOM), which is seasonally variable, we expect also fraction...
Abstract Inland waters receive and process large amounts of colored organic matter from the terrestrial surroundings. These inputs dramatically affect chemical, physical, biological properties water bodies, as well their roles global carbon sinks sources. To understand complex changes associated with allochthonous inputs, experiments are needed. However, manipulative studies, especially at ecosystem scales, require dissolved optical chemical resembling indigenous matter. Here we compared...
Abstract Aquatic dissolved organic matter (DOM) is a crucial component of the global carbon cycle, and extent to which DOM escapes mineralization important for transport from continents ocean. persistence strongly depends on its molecular properties, but little known about specific properties cause continuum in reactivity among different molecules. We investigated how fractions, separated according their hydrophobicity, differ across three inland water systems. found strong negative...
Abstract Photochemical degradation of dissolved organic matter (DOM) has been the subject numerous studies, however, its regulation along inland water continuum is still unclear. We aimed to unravel DOM photoreactivity and concurrent compositional changes across 30 boreal aquatic ecosystems including peat waters, streams, rivers, lakes distributed a retention time (WRT) gradient. Samples were standardized exposure simulated sunlight. measured apparent quantum yield (AQY), which corresponds...
<p>The thawing of permafrost is leading to increased export organic matter into aquatic ecosystems that was previously stored within frozen peatland soils. This has been found be reactive microbial and photochemical processes, so thaw expected lead an production greenhouse gases. Being able predict the fate these loads terrestrial carbon in systems therefore important from a climate change perspective. In previous study we suggest compounds susceptible photodegradation are also...