A5032410302- Arctic and Antarctic ice dynamics
- Marine and coastal ecosystems
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Microbial Community Ecology and Physiology
- Cryospheric studies and observations
- Hydrocarbon exploration and reservoir analysis
- Ecology and biodiversity studies
- Geological Studies and Exploration
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Fish Ecology and Management Studies
- Marine Bivalve and Aquaculture Studies
- Marine Biology and Ecology Research
- Carbon Dioxide Capture Technologies
- Soil and Water Nutrient Dynamics
- Marine and fisheries research
- Aquatic Ecosystems and Phytoplankton Dynamics
Umeå University
2021-2023
Abisko Scientific Research Station
2022
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 Benthic gross primary production (GPP) is often the most important part of aquatic food webs in northern lakes, which are gradually warming and receiving increased terrestrial colored dissolved organic carbon loadings due to global change. Yet, measurements benthic GPP fairly uncommon, methods unit dimensions unstandardized rarely compared. In this study, we measured 27 headwater lakes from three regions Sweden analyzed potential constraining drivers z rates at discrete depths...
Abstract Aquatic microbial responses to changes in the amount and composition of dissolved organic carbon (DOC) are fundamental ecological biogeochemical importance. Parallel factor (PARAFAC) analysis excitation–emission fluorescence spectra is a common tool characterize DOC, yet its ability predict bacterial production (BP), respiration (BR), growth efficiency (BGE) vary widely, potentially because inorganic nutrient limitation decouples processes from their dependence on DOC composition....
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 Lakes evade significant amounts of carbon dioxide (CO 2 ) to the atmosphere; yet magnitude and origin evasion are still poorly constrained. We quantified annual CO its (in‐lake net ecosystem production vs. lateral inputs from terrestrial ecosystems) in 14 high‐latitude lakes through high‐frequency estimates open water flux metabolism inorganic mass‐balance before after ice breakup. Annual ranged 1 25 g C m −2 yr −1 which an average 57% was evaded over a short period at ice‐breakup....
<p><strong>Internal and external sources of CO<sub>2</sub> release in subarctic lakes</strong></p><p>Most lakes are supersaturated with CO<sub>2</sub>, thus net CO<sub>2 </sub>to the atmosphere. Lakes can only sustain annual </sub>emissions through either 1) mineralization terrestrial carbon flushed into system or 2) transfer...