A5028323058- Atmospheric and Environmental Gas Dynamics
- Marine and coastal ecosystems
- Methane Hydrates and Related Phenomena
- Hydrocarbon exploration and reservoir analysis
- Per- and polyfluoroalkyl substances research
- Hydraulic Fracturing and Reservoir Analysis
- Aquatic Ecosystems and Phytoplankton Dynamics
- Climate variability and models
- Groundwater and Isotope Geochemistry
- Peatlands and Wetlands Ecology
- Reservoir Engineering and Simulation Methods
- Carbon Dioxide Capture Technologies
- Enhanced Oil Recovery Techniques
- Atmospheric chemistry and aerosols
- Integrated Water Resources Management
- Soil and Water Nutrient Dynamics
Linköping University
2020-2024
Uppsala University
2021
Significance Methane (CH 4 ) emissions from lakes are significant, yet still highly uncertain and a key bottleneck for understanding the global methane budget. Current lake flux estimates do not account diel variability of CH flux. Here, we apply high-resolution spatiotemporal measurement approach in multiple report extensive data on between day night emissions. Our results demonstrate clear consistent pattern with more than twofold higher daytime fluxes. We show that it is critical to...
Abstract The CO 2 flux () from lakes to the atmosphere is a large component of global carbon cycle and depends on air–water concentration gradient (ΔCO ) gas transfer velocity ( k ). Both ΔCO can vary multiple timescales understanding their contributions important for explaining variability in fluxes developing optimal sampling designs. We measured derived one full ice‐free period 18 using floating chambers estimated variability. Generally, contributed more than short‐term (1–9 d) With...
Abstract Lakes are generally supersaturated in carbon dioxide (CO 2 ) and emitters of CO to the atmosphere. However, estimates flux ( from lakes seldom based on direct measurements usually do not account for nighttime emissions, yielding risk biased assessments. Here, we present automated floating chambers collected every 2–3 hr spanning 115 24 periods three boreal during summer stratification before after autumn mixing most eutrophic lake these. We observed 40%–67% higher mean daytime...
Abstract An increasing number of rivers is being dammed, particularly in the tropics, and reservoir water surfaces can be a substantial anthropogenic source greenhouse gases. On average, 80% CO 2 ‐equivalent emission reservoirs globally has been attributed to CH 4 , which predominantly emitted via ebullition. Since ebullition highly variable across space time, both measuring upscaling an entire challenging, estimates are therefore not well constrained. We measured at high spatial resolution...
Large greenhouse gas emissions occur via the release of carbon dioxide (CO2) and methane (CH4) from surface layer lakes. Such are modeled air–water concentration gradient transfer velocity (k). The links between k physical properties water have led to development methods convert gases through Schmidt number normalization. However, recent observations found that such normalization apparent estimates field measurements can yield different results for CH4 CO2. We estimated CO2 gradients fluxes...
Methane (CH 4 ) is an important component of the carbon (C) cycling in lakes. CH production enables sediments to be either reintroduced food web via oxidation or emitted as a greenhouse gas making lakes one largest natural sources atmospheric . Large stable isotopic fractionation during makes changes 13 C: 12 C ratio (δ C) powerful and widely used tool determine extent which lake oxidized, rather than emitted. This relies on correct δ values original sources, variability has rarely been...
Abstract Lakes contribute 9%–19% of global methane (CH 4 ) emissions to the atmosphere. Dissolved molecular oxygen (DO) in lakes can inhibit production CH and promote oxidation. DO is therefore often considered an important regulator from lakes. Presence or absence water above sediments affect by (a) influencing if be fueled most reactive organic matter top sediment layer rely on deeper less degradable matter, (b) enabling accumulation deep waters potentially large upon column turnover....
Methane (CH4) emissions (FCH4) from northern freshwater lakes are not only significant but also highly variable in time and one driver suggested to be important is precipitation. Rain can have various, potentially large effects on FCH4 across multiple frames, verifying the impact of rain lake key understand both contemporary flux regulation, predict future related possible changes frequency intensity rainfall climate change. The main objective this study was assess short-term typically...
<p>Lakes are responsible for substantial emissions of methane (CH<sub>4</sub>) to the atmosphere globally, but their contribution is poorly constrained and current estimates vary widely. One reasons this large uncertainty lies in practical challenges involved collecting CH<sub>4</sub> concentration flux data at suitable temporal spatial scales capture natural variability. Here, we present results an attempt account...
<p>Lakes are major global sources of atmospheric methane (CH<sub>4</sub>), representing an important greenhouse gas. Dissolved molecular Oxygen (DO) in lakes hinders production CH<sub>4</sub> while promoting oxidation. Consequently, it has been suggested as regulator emissions from lakes. Presence or absence DO at the sediment-water interface could therefore influence extent top sediment layers, and amount that is stored...
<p>Lakes emit CO<sub>2</sub> to the atmosphere at magnitudes significant for global carbon cycle, in form of diffusive CO<sub>2</sub> flux (F<sub>CO2</sub>). As direct F<sub>CO2</sub> measurements are time-consuming, F<sub>CO2</sub> is often estimated from air-water...