A5085503768- Climate change and permafrost
- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Isotope Analysis in Ecology
- Hydrology and Watershed Management Studies
- Freshwater macroinvertebrate diversity and ecology
- Groundwater and Isotope Geochemistry
- Peatlands and Wetlands Ecology
- Fish Ecology and Management Studies
- Geology and Paleoclimatology Research
- Aquatic Invertebrate Ecology and Behavior
- Environmental DNA in Biodiversity Studies
- Soil and Water Nutrient Dynamics
- Climate variability and models
- Marine and coastal ecosystems
- Hydrology and Sediment Transport Processes
- Gut microbiota and health
- Microbial Community Ecology and Physiology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Botany and Plant Ecology Studies
- Urban and Freight Transport Logistics
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
University of Oulu
2016-2025
Abstract Subarctic ecohydrological processes are changing rapidly, but detailed and integrated investigations not as widespread necessary. We introduce an research catchment site (Pallas) for atmosphere, ecosystems, ecohydrology studies in subarctic conditions Finland that can be used a new set of comparative investigations. The Pallas provides unique observational data high‐intensity field measurement datasets over long periods. infrastructure atmosphere‐ to landscape‐scale ecosystem...
Abstract Snowmelt spring floods regulate carbon transport from land to streams. However, these coupled processes are rarely documented through high‐resolution measurements focused on water‐carbon interactions. We collated a state‐of‐the‐art high‐frequency data set throughout snowmelt and early post period, alongside regular samples of stream water, precipitation, isotopes (δ 18 O). Our study was conducted during the 2019 initial season in subarctic, peatland influenced headwater catchment...
Abstract Air temperature at the northernmost latitudes is predicted to increase steeply and precipitation become more variable by end of 21st century, resulting in altered thermal hydrological regimes. We applied five climate scenarios predict future (2070–2100) benthic macroinvertebrate assemblages 239 near‐pristine sites across Finland (ca. 1200 km latitudinal span). used a multitaxon distribution model with air modeled daily flow as predictors. As expected, projected increased most...
Although flow regime is one of the major drivers riverine communities, not much known about how inter‐annual variability and extremes influence community assembly mechanisms. We used data on benthic macroinvertebrates modelled regimes in 23 near‐pristine boreal streams to assess mechanisms species occupancy varied response conditions across 11 successive years encompassing extreme (both low high) events. A null model approach was test whether deterministic or stochastic processes dominated...
Arctic sea-ice loss is emblematic of an amplified water cycle and has critical feedback implications for global climate. Stable isotopes (δ 18 O, δ 2 H, d-excess ) are valuable tracers constraining climate processes through space time. Yet, the paucity well-resolved isotope data preclude empirically derived understanding hydrologic changes occurring today, in deep (geologic) past, future. To address this knowledge gap, Pan-Arctic Precipitation Isotope Network (PAPIN) was established 2018 to...
The Arctic’s winter water cycle is rapidly changing, with implications for snow moisture sources and transport processes. Stable isotope values (δ18O, δ2H, d-excess) of the Arctic snowpack have potential to provide proxy records these processes, yet it unclear how well individual snowfall events are preserved within profiles. Here, we present data from multiple taiga tundra profiles sampled in Alaska Finland, respectively, during 2018–2019. We compare stratigraphy meteoric isotopes (vapor...
Increasing nutrient loads are impairing water quality and ecological status of aquatic ecosystems globally, but their effects on Arctic freshwaters remain less studied. Nutrients in increasing due to expanding anthropogenic land use climate change induced alterations leaching transport. Also increased occurrences non-native semelparous Pacific pink salmon (Oncorhynchus gorbuscha) the northern European rivers can enhance availability. These additional nutrients may be readily available for...
Abstract Stream ecosystems are affected by multiple abiotic stressors, and species responses to simultaneous stressors may differ from those predicted based on single‐stressor responses. Using 12 semi‐natural stream channels, we examined the individual interactive effects of flow level (low or high flow) addition fine sediments (grain size <2 mm) key ecosystem processes (leaf breakdown, algal biomass accrual) benthic macroinvertebrate fungal communities. Both had mostly independent...
Abstract Motivation Aquatic insects comprise 64% of freshwater animal diversity and are widely used as bioindicators to assess water quality impairment ecosystem health, well test ecological hypotheses. Despite their importance, a comprehensive, global database aquatic insect occurrences for mapping biodiversity in macroecological studies applied research is missing. We aim fill this gap present the Global EPTO Database , which includes worldwide geo‐referenced occurrence records four major...
Abstract Dendritic stream networks are an intriguing subject for exploring the spatial and temporal variability of rare common bacterial biosphere, yet very few such studies have been conducted. We sampled riverine bacterioplankton at 13 sites in a subarctic network across 3 years, with five sampling times each year. Ordinations showed consistent pattern downstream shift both abundant subcommunities. also detected signal, seasonal community shifts reflecting changes water temperature...
Despite the fundamental role of river flow in determining structure and function lotic ecosystems, few studies have directly related features natural regime to variation stream invertebrate assemblage composition. We classified 240 near-pristine, snowmelt-dominated Finnish streams into hydrological types. assessed relationship these types with benthic macroinvertebrate examined relative importance variables, local-habitat geographical location predicting structure. used a model obtain...
Abstract. Dissolved organic carbon (DOC) dynamics are evolving in the rapidly changing Arctic and a comprehensive understanding of controlling processes is urgently required. For example, transport governing DOC prone to climate-driven alteration given their strong seasonal nature. Hence, high-resolution long-term studies required assess potential interannual changes processes. In this study, we monitored at 30 min resolution from September 2018 December 2022 headwater peatland-influenced...
The Isotope based Hydrograph Separation (IHS) has been instrumental in understanding the partitioning of streamflow sources and processes. However, uncertainties persist accuracy IHS estimations appropriate definition sampling endmembers. To address these uncertainties, we used field data snowpack, snowfall, snow meltwater isotopes (δ18O) from Pallas, Northern Finland to estimate total contribution during snowmelt period. We investigated biases resulting application different strategies for...
Natural abundance variations in stable isotope ratios of hydrogen and oxygen are important environmental tracers with a significant range applications&#160; (e.g., the exploration present water cycle, paleoclimate reconstructions, ecology, food authenticity). These applications research themes often based on spatially explicit predictions precipitation isotopic obtained from point sample collections measurements through various interpolation techniques. The derivation continuous...
Carbon-water interaction studies between aquatic and terrestrial ecosystems are especially needed today in Arctic Boreal regions, as they facing drastic warming precipitation shifts. Despite the importance of streams carbon cycle, northern stream-based scarce, owing to a lack measurements throughout north, possibly skewing global greenhouse gas estimates. We used combination multiscale quantify water sources (H
Snow plays an important role in the Northern water cycle providing temporary storage, and resulting high flows during spring snowmelt. is experiencing rapid changes due to global warming, process-based understanding of how snowmelt interacts with environment becoming ever more important. Stable isotopes 18O 2H are recognized as reliable tracers for determining sources tracing their movement within a catchment. The Isotope-Based Hydrograph Separation (IHS) used determine mix streams. However,...
Abstract. The Arctic Ocean’s snow cover is crucial in moderating interactions between sea-ice and the atmosphere, yet fully grasping its isotopic composition processes shaping it presents substantial challenges. This study employs a unique dataset from Multidisciplinary drifting Observatory for Study of Climate (MOSAiC) expedition to explore complex deposition post-depositional changes affecting on sea ice. By examining 911 individual isotope measurements collected over full year, we...
Figure S1 Monthly d-excess variations are presented as boxplots, for vapour (pink
Abstract We conducted a series of tracer test experiments in 12 outdoor semi-natural flumes to assess the effects variable flow conditions and sand addition on hyporheic zone gravel beds, mimicking headwater streams under sediment pressure. Two methods were applied each experiment: 2–5 tracer-pulse tests all pulses monitored at three distances downstream flume inlet (0 m, 5 m 10 bed surface), pipes installed into distances. The breakthrough curves (total 120 injections) then analysed with...
&lt;p&gt;Stable isotopes of oxygen and hydrogen in precipitation (&amp;#948;&lt;sup&gt;18&lt;/sup&gt;O&lt;sub&gt;P&lt;/sub&gt;, &amp;#948;&lt;sup&gt;2&lt;/sup&gt;H&lt;sub&gt;P&lt;/sub&gt;, d-excess) are valuable hydrological tracers linked to ocean-atmospheric processes such as moisture source, storm trajectory, seasonal temperature cycles. However, characteristics...