A5040299688- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Fish Ecology and Management Studies
- Soil and Water Nutrient Dynamics
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Microbial Community Ecology and Physiology
- Cryospheric studies and observations
- Methane Hydrates and Related Phenomena
- Peatlands and Wetlands Ecology
- Forest ecology and management
- Isotope Analysis in Ecology
- Fire effects on ecosystems
- Ocean Acidification Effects and Responses
- Hydrocarbon exploration and reservoir analysis
- Geology and Paleoclimatology Research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Groundwater flow and contamination studies
- Hydrology and Watershed Management Studies
- Aeolian processes and effects
- Ecology and biodiversity studies
- Geological Studies and Exploration
- Groundwater and Isotope Geochemistry
- Tree Root and Stability Studies
- Oceanographic and Atmospheric Processes
Swedish University of Agricultural Sciences
2020-2024
Czech Academy of Sciences, Global Change Research Institute
2024
Umeå University
2013-2023
University of Vienna
2021
Aarhus University
2021
Wasser Cluster Lunz
2021
Abisko Scientific Research Station
2021
Humboldt-Universität zu Berlin
2011
Potsdam Institute for Climate Impact Research
2011
Abstract. Strong winds may uproot and break trees represent a major natural disturbance for European forests. Wind disturbances have intensified over the last decades globally are expected to further rise in view of effects climate change. Despite importance such disturbances, there currently no spatially explicit databases wind-related impact at pan-European scale. Here, we present new database wind forests (FORWIND). FORWIND is comprised more than 80 000 delineated areas Europe that were...
Scientific Significance Statement Metabolic stoichiometry predicts that dissolved oxygen (O 2 ) and carbon dioxide (CO in aquatic ecosystems should covary inversely; however, field observations often diverge from theoretical expectations. Here, we propose a suite of metrics describing this O CO decoupling introduce conceptual framework for interpreting these within ecosystems. Within framework, interpret cross‐system patterns high‐frequency measurements 11 northern lakes extract emergent...
High-elevation mountains have experienced disproportionately rapid warming, yet the effect of warming on lateral export terrestrial carbon to rivers remains poorly explored and understood in these regions. Here, we present a long-term data set dissolved inorganic (DIC) more detailed, short-term DIC, δ13CDIC, organic from two major Qinghai–Tibetan Plateau, Jinsha River (JSR) Yalong (YLR). In higher-elevation JSR with ∼51% continuous permafrost coverage, (>3 °C) increasing precipitation...
Abstract Estimating air–water gas transfer velocities ( k ) is integral to understand biogeochemical and ecological processes in aquatic systems. In lakes, commonly predicted using wind-based empirical models, however, their predictive performance under conditions that differ from original calibration remains largely unassessed. Here, we collected 2222 published estimates derived various methods 46 globally distributed lakes (1) evaluate the predictions of a selection six available...
Abstract Globally, inland waters emit over 2 Pg of carbon per year as dioxide, which the majority originates from streams and rivers. Despite global significance fluvial dioxide emissions, little is known about their diel dynamics. Here we present a large-scale assessment day- night-time fluxes at water-air interface across 34 European streams. We directly measured four times between October 2016 July 2017 using drifting chambers. Median are 1.4 2.1 mmol m −2 h −1 midday midnight,...
Abstract Carbon dioxide (CO 2 ) concentrations in lakes vary strongly over time. This variability is rarely captured by environmental monitoring but crucial for accurately assessing the magnitude of lake CO emissions. However, it unknown to what extent temporal needs be understand important drivers carbon cycling such as climate and land management. We used data Swedish forest collected autumn ( n = 439) throughout whole open water season 22) from a wet dry year assess effects forestry on...
Abstract Oxygen depletion in lake bottom waters has adverse impacts on ecosystem health including decreased water quality from release of nutrients and reduced substances sediments, the reduction fish growth reproduction. Depletion occurs when oxygen is consumed during decomposition organic matter, replenishment limited by column stratification. Arctic–alpine lakes are often well mixed oxygenated, but rapid climate change these regions an important driver shifts catchment vegetation that...
Mountain streams are hot spots for the exchange of gases such as oxygen or carbon dioxide with atmosphere. Air-water gas is accelerated by air bubbles entrained in turbulent flow and depends on bubble concentration size. Yet, our understanding mechanisms ability to upscale fluxes hampered a severe lack data size distributions streams. Here, we measured 16 step-pool systems across six stream reaches two mountain ranges (Dolomites, Italy; Vosges, France), combining Acoustic Bubble Spectrometry...
Abstract. Dissolved organic carbon (DOC) may be removed, transformed, or added during water transit through lakes, resulting in changes DOC composition and pigmentation (color). However, the process-based understanding of these is incomplete, especially for headwater lakes. We hypothesized that because heterotrophic bacteria preferentially consume noncolored DOC, while photochemical processing removes colored fractions, overall color upon passage a lake depend on relative importance two...
Abstract In seasonally ice‐covered lakes, carbon dioxide (CO 2 ) and methane (CH 4 emission at ice‐off can account for a significant fraction of the annual budget. Yet knowledge mechanisms controlling below lake‐ice (C) dynamics subsequent CO CH emissions is limited. To understand control ice C dynamics, in spring, we measured spatial variation , dissolved inorganic organic from ice‐on to ice‐off, small boreal lake during winter with sporadic melting events. Winter melt events were...
ABSTRACT Cryogenic soil activity caused by differential movements during freeze‐thaw cycles is of fundamental importance for Arctic ecosystem functioning, but its response to climate warming uncertain. Eight proxies cryogenic (including measurements surface motion, vegetation and grey values aerial photographs) were examined at eight study sites where non‐sorted patterned ground spans an elevation gradient (400–1150 m asl) a precipitation (300–1000 mm yr ‐1 ) near Abisko, northern Sweden....
Quantifying air-water gas exchange is critical for estimating greenhouse fluxes and metabolism in aquatic ecosystems. In high-energy streams, the rate k poorly constrained, due to an incomplete understanding of turbulence bubble contributions k. We performed a flume experiment with air additions evaluate combined effects bubbles on helium, argon, xenon, methane. created contrasting hydraulic conditions by varying channel slope, bed roughness, water discharge, flux. found that increased from...
Abstract Anthropogenic activities are increasing inorganic nitrogen (N) loadings to unproductive boreal lakes. In many of these lakes phytoplankton N limited, consequently fertilization may affect ecosystem productivity and consumer resource use. Here, we conducted whole lake experiments with six small limited (three control three enriched) in an area receiving low deposition one reference two impact years. Our aim was assess the effects on pelagic biomass production We found that primary...
Abstract Ecological theory predicts that the relative distribution of primary production across habitats influence fish size structure and biomass production. In this study, we assessed individual, population, community-level consequences for brown trout ( Salmo trutta ) Arctic char Salvelinus alpinus variation in estimated habitat specific (benthic pelagic) total whole lake (GPP gross 27 northern oligotrophic lakes. We found higher contribution benthic to GPP was associated with community...
Abstract Global warming and land use scenarios suggest increased 21 st century nitrogen (N) inputs to aquatic systems. Nitrogen affects in‐lake processing and, potentially, atmospheric exchange of greenhouse gases, probably being most relevant in unproductive Here, we test for the first time effect a whole‐lake experimental increase (threefold) external nitrate loads on carbon dioxide (CO 2 ), methane (CH 4 nitrous oxide (N O) from N‐limited boreal lakes. Nitrate enrichment effects were...
Abstract. Forestry practices often result in an increased export of carbon and nitrogen to downstream aquatic systems. Although these losses affect the greenhouse gas (GHG) budget managed forests, it is unknown if they modify GHG emissions recipient To assess this question, air–water fluxes dioxide (CO2), methane (CH4) nitrous oxide (N2O) were quantified for humic lakes their inlet streams four boreal catchments using a before-after control-impact experiment. Two treated with forest...
Abstract Groundwater is one of the largest continental carbon reservoirs and tightly linked to globally important fluxes such as uptake on land, degassing from inland waters delivery oceans. Despite emerging evidence that these are sensitive environmental changes, long-term dynamics in groundwater remain widely unknown. Here I show dissolved inorganic dioxide concentrations groundwater, calculated monitoring data (e.g. alkalinity, pH), have increased average by 28% 49%, respectively, across...
Abstract In lakes, the rates of gross primary production (GPP), ecosystem respiration (R), and net (NEP) are often controlled by resource availability. Herein, we explore how catchment vs. within lake predictors metabolism compare using data from 16 lakes spanning 39°N to 64°N, a range inflowing streams, trophic status. For each lake, combined stream loads dissolved organic carbon (DOC), total nitrogen (TN), phosphorus (TP) with DOC, TN, TP concentrations high frequency in situ monitoring...
Abstract Air–water gas exchange velocities ( k ) are critical components of many biogeochemical and ecological process studies in aquatic systems. However, their high spatiotemporal variability is difficult to capture with traditional methods, especially turbulent flow. Here, we investigate the potential sound spectral analysis infer running waters, based on rationale that both turbulence entrained bubbles drive cause a characteristic sound. We explored relationship between properties using...
Abstract. Carbon dioxide (CO2) emissions from running waters represent a key component of the global carbon cycle. However, quantifying CO2 fluxes across air–water boundaries remains challenging due to practical difficulties in estimation reach-scale standardized gas exchange velocities (k600) and water equilibrium concentrations. Whereas craft-made floating chambers supplied by internal sensors promising technique estimate rivers, existing literature lacks rigorous comparisons among...
Abstract Metabolism is one of the most fundamental ecosystem processes, but drivers variation in metabolic rates among lakes dominated by benthic primary producers remain poorly constrained. Here, we report magnitudes and potential whole‐lake metabolism across 43 Swedish arctic–alpine lakes, based on free‐water diel oxygen technique with sondes deployed during open‐water season near surface bottom lakes. Gross production (GPP) respiration (R) were strongly coupled ranged from 0.06 to 0.45 mg...
Abstract Current estimates of carbon dioxide (CO 2 ) evasion from Arctic lakes are highly uncertain because few studies integrate seasonal variability, specifically during spring ice‐melt. We quantified annual CO for 14 clear‐water in Northern Sweden through mass balance (ice‐melt period) and high‐frequency loggers (open‐water period). On average, 80% (SD: ± 18) occurred within 10 d following The contribution the ice‐melt period to was high compared earlier (47% 32%). Across all lakes,...
Abstract Understanding controls on primary productivity is essential for describing ecosystems and their responses to environmental change. In lakes, pelagic gross (GPP) strongly controlled by inputs of nutrients dissolved organic matter. Although past studies have developed process models this nutrient‐color paradigm (NCP), broad empirical tests these are scarce. We used data from 58 globally distributed, mostly temperate lakes test such a model improve understanding prediction the lake...
Abstract Aim Although running waters are getting recognized as important methane sources, large‐scale geographical patterns of microorganisms controlling the net balance streams still unknown. Here we aim at describing community compositions methanogenic and methanotrophic large spatial scales linking their abundances to potential sediment production (PMP) oxidation rates (PMO). Location The study spans across 16 European from northern Spain Sweden western Ireland Bulgaria. Taxon...