A5013099153- Soil and Water Nutrient Dynamics
- Marine and coastal ecosystems
- Fish Ecology and Management Studies
- Hydrology and Watershed Management Studies
- Water Quality and Pollution Assessment
- Peatlands and Wetlands Ecology
- Groundwater and Isotope Geochemistry
- Atmospheric and Environmental Gas Dynamics
- Integrated Water Resources Management
- Heavy metals in environment
- Freshwater macroinvertebrate diversity and ecology
- Aquatic Invertebrate Ecology and Behavior
- Fire effects on ecosystems
- Marine and fisheries research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Water Quality and Resources Studies
- Cryospheric studies and observations
- Environmental Science and Water Management
- Hydrology and Sediment Transport Processes
- Ocean Acidification Effects and Responses
- Soil erosion and sediment transport
- Marine Bivalve and Aquaculture Studies
- Science and Climate Studies
- Climate variability and models
- Phosphorus and nutrient management
Swedish University of Agricultural Sciences
2014-2025
Uppsala University
1989-2011
IVL Swedish Environmental Research Institute
2007
Abstract Increasing concentrations of organic matter (OM) in surface waters have been noted over large parts the boreal/nemoral zone Europe and North America. This has raised questions about causes likelihood further increases. A number drivers proposed, including temperature, hydrology, as well ‐ Cl − deposition. The data reported so far, however, insufficient to define relative importance different landscapes where they interact. Thirty‐five years monthly measurements absorbance chemical...
For more than 50 years, scientific insights from surface water monitoring have supported Swedish evidence-based environmental management. Efforts to understand and control eutrophication in the 1960s led construction of wastewater treatment plants with phosphorus retention, while acid rain research 1970s contributed international legislation curbing emissions. By 1990s, long-time series were being used infer climate effects on chemistry biology. Monitoring data play a key role implementing...
Surface water browning, the result of increasing concentrations dissolved organic matter (DOM), has been widespread in northern ecosystems recent decades. Here, we assess a database 426 undisturbed headwater lakes and streams Europe North America for evidence trends DOM between 1990 2016. We describe contrasting changes (decelerating) (accelerating), which are consistent with solubility responses to declines sulfate deposition. While earlier (1990-2004) were almost entirely related...
Long-term (1987–2012) water quality monitoring in 36 acid-sensitive Swedish lakes shows slow recovery from historic acidification. Overall, strong acid anion concentrations declined, primarily as a result of declines sulfate. Chloride is now the dominant many lakes. Base cation have declined less rapidly than concentrations, leading to an increase charge balance neutralizing capacity. In lakes, modeled organic acidity approximately equal inorganic acidity. The observed trends chemistry...
We present an analysis of long-term (1988-2013; 26years) total phosphorus (TP) concentration trends in 81 Swedish boreal lakes subject to minimal anthropogenic disturbance. Near universal increases dissolved organic carbon (DOC) concentrations and a widespread but hitherto unexplained decline TP were observed. Over 50% the (n=42) had significant declining over past quarter century (Sen's slope=2.5%y-1). These declines linked catchment processes related changes climate, recovery from...
Suspended solids (SS) are important carriers of pollutants such as phosphorus (P) in streams, but the sampling frequency monitoring programs is usually insufficiently frequent to capture episodic SS and total P (TP) peaks. The suitability turbidity conductivity a surrogate for TP was studied using 108 stations located catchments different sizes, land uses, pollution levels. use high-frequency measurements estimate loads compared with two methods (grab, flow-proportional sampling) case study....
Concentrations of organic acids in freshwaters have increased significantly during recent decades across large parts Europe and North America. Different theories the causes (e.g., recovery from acidification, climate change, land use) different implications for defining preindustrial levels dissolved carbon (DOC), which are crucial assessing acidification other aspects water quality. We demonstrate this by classifying status 66 lakes with long-term observations, representative about 12,700...
Abstract. Long term data series (1996 through 2009) for trace metals were analyzed from a large number of streams and rivers across Sweden varying in tributary watershed size 0.05 to 48 193 km2. The final set included 139 stream sites with arsenic (As), cobalt (Co), copper (Cu), chromium (Cr), nickel (Ni), lead (Pb), zinc (Zn), vanadium (V). Between 7 % 46 the showed significant trends according seasonal Kendall test. However, contrast previous studies depositional patterns, substantial...
Surface water eutrophication resulting from excessive phosphorus (P) inputs is one of today's most challenging environmental issues. Riverine total (TP) concentrations have high temporal variability, which complicates flux estimation. We evaluated the usefulness frequency in-situ turbidity measurements as a proxy for TP in Sävjaån, river draining mixed land use catchment (722 km2) central Sweden. Turbidity was monitored every 10th-15th minute during 6 consecutive years (2012-2017). Linear...
Abstract. Wildfires are the major disturbance in boreal ecosystems and of great importance for biogeochemical cycles carbon (C) nutrients. However, these fire-induced impacts hard to quantify rarely assessed together at an ecosystem level incorporating both aquatic terrestrial environments. Following a wildfire Sweden area with ongoing monitoring, we conducted pre-fire (9 years) post-fire (4 multi-catchment investigation element losses (combustion leaching) on water quality. Direct C...
• Three decades of brownification in 164 Swedish watercourses were evaluated. Widespread organic carbon increases ceased 2010, color 2000. Organic many became less colored after Long-term trends must be evaluated with appropriate statistical methods. Abstract art caption: The mean estimated trend TOC concentration based on 1990–2020. matter (OM) content surface waters, as measured by and (OC), are a major issue for aquatic ecosystems. monitoring programs revealed the “brownification”,...
Climate change in combination with land use alterations may lead to significant changes soil erosion and sediment fluxes streams. Optical turbidity sensors can monitor high frequency be used as a proxy for suspended concentration (SSC) provided there is an acceptable calibration curve measured by SSC from water samples. This study such data 31 streams 11 different research projects or monitoring programmes six Northern European countries. The aim was find patterns the turbidity-SSC...
ABSTRACT Paleolimnological reconstructions of past changes in carbon stable isotopic composition chironomid head capsules (δ 13 C HC ) were used to quantify the impacts atmospheric sulphur and nitrogen depositions on processing at base lake food webs. We hypothesised that deposition flows through webs are influenced by nutrient limitation, as increasing inputs expected drive higher primary producer biomass nitrogen‐limited lakes, thus its availability for benthic consumers. The δ values...
<title>Abstract</title> The annual mean concentration of nutrients is a commonly used parameter in implementing the Water Framework Directive, to assess current environmental status and distance from goal. However, streams may vary significantly over short time spans so finding ‘true mean’ can be difficult. We hourly turbidity data optical sensors 10 four Nordic countries, we prepared mimic series for weekly, fortnightly, monthly sampling strategies. calibrated sensor with total phosphorus...
Quantifying human impacts on the natural environment requires credible reconstructions of reference conditions. Anthropogenic acidification surface waters is strongly influenced by total organic carbon (TOC) concentrations. Because both degree and recovery are dependent historical TOC concentrations, simple models to estimate changes in water between conditions (1860) present day (2012) needed. We used visible near infrared spectroscopy (VNIRS) lake sediments reconstruct condition long-term...
Generalized additive models are increasingly used to identify and describe environmental trends. A major advantage of these models, as compared simpler statistical tools such linear regression or Mann-Kendall tests, is that they provide estimates prevailing levels trend magnitudes at any given point in time instead an overall measure. For multiple series, this versatility has be followed by flexible visualization methods can summarize visualize analysis results for many series...
Abstract Small streams with catchment areas < 2 km make up the majority of all stream length and are great ecological importance. Surveys first second order reveal spatial temporal variability in water chemistry these headwaters, but their assessment presents a serious challenge since systematic, representative data usually only collected larger rivers. Using low flow synoptic survey from seven mesoscale Swedish catchments, this study tests hypothesis that downstream monitoring can be...