A5014514759- Marine and coastal ecosystems
- Oceanographic and Atmospheric Processes
- Aquatic Ecosystems and Phytoplankton Dynamics
- Arctic and Antarctic ice dynamics
- Hydrology and Watershed Management Studies
- Geology and Paleoclimatology Research
- Fish Ecology and Management Studies
- Geological formations and processes
- Hydrology and Sediment Transport Processes
- Cryospheric studies and observations
- Climate variability and models
- Flood Risk Assessment and Management
- Hydrological Forecasting Using AI
- Marine and environmental studies
- Aquatic Invertebrate Ecology and Behavior
- Water Quality Monitoring Technologies
- Coastal and Marine Dynamics
- Microbial Community Ecology and Physiology
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Water Quality and Pollution Assessment
- Meteorological Phenomena and Simulations
- Methane Hydrates and Related Phenomena
- Marine Biology and Ecology Research
- Soil erosion and sediment transport
Swiss Federal Institute of Aquatic Science and Technology
2017-2025
University of Lausanne
2022-2025
Baum Consult
2021
École Polytechnique Fédérale de Lausanne
2013-2019
Queen's University
2012-2017
Aquatic Systems (United States)
2017
Large lakes of the world are habitats for diverse species, including endemic taxa, and valuable resources that provide humanity with many ecosystem services. They also sentinels global local change, recent studies in limnology paleolimnology have demonstrated disturbing evidence their collective degradation terms depletion (water food), rapid warming loss ice, destruction ecosystems, accelerating pollution. particularly exposed to anthropogenic climatic stressors. The Second Warning Humanity...
Abstract Long‐term lake ice phenological records from around the Northern Hemisphere provide unique sensitive indicators of climatic variations, even prior to existence physical meteorological measurement stations. Here, we updated phenology for 60 lakes with time‐series ranging 107–204 years first re‐assessment Hemispheric trends since 2004 by adding 15 additional and 40 our study. We found that, on average, ice‐on was 11.0 days later, ice‐off 6.8 earlier, duration 17.0 shorter per century...
Abstract. Empirical evidence demonstrates that lakes and reservoirs are warming across the globe. Consequently, there is an increased need to project future changes in lake thermal structure resulting biogeochemistry order plan for likely impacts. Previous studies of impacts climate change on have often relied a single model forced with limited scenario-driven projections relatively small number lakes. As result, our understanding effects fragmentary, based scattered using different data...
Lake surface water temperatures (LSWTs) are sensitive to atmospheric warming and have previously been shown respond regional changes in the climate. Using a combination of situ simulated from 20 Central European lakes, with data spanning between 50 ∼100 years, we investigate long-term increase annually averaged LSWT. We demonstrate that lakes most spring experience seasonal variation LSWT trends. calculate significant during past few decades illustrate, using sequential t test analysis...
Abstract Low concentrations of dissolved oxygen remain a global concern regarding the ecological health lakes and reservoirs. In addition to high nutrient loads, climate‐induced changes in lake stratification mixing represent additional anthropogenic menace resulting decreased deepwater levels. The analysis 43 years monitoring data from Lake Geneva shows no decreasing trend neither areal hypolimnetic mineralization rate nor extent hypoxia. Instead, hypoxic conditions are predominantly...
Lakes and other confined water bodies are not exposed to tides, their wind forcing is usually much weaker compared ocean basins estuaries. Hence, convective processes often the dominant drivers for shaping mixing stratification structures in inland waters. Due diverse environments of lakes—defined by local morphological, geochemical, meteorological conditions, among others—a fascinating variety can develop with remarkably unique signatures. Whereas classical cooling-induced shear-induced...
Abstract Turbulent mixing produced by breaking of internal waves plays an important role in setting the patterns downwelling and upwelling deep dense waters thereby helps sustain global ocean overturning circulation. A key parameter used to characterize turbulent is its efficiency, defined here as fraction energy available turbulence that invested mixing. Efficiency conventionally approximated a constant value near one sixth. Here we show efficiency varies significantly abyssal can be large...
Environmental management depends on high-quality monitoring and its meaningful interpretation. The combination of local weather dynamics, regional anthropogenic stresses global environmental changes make the evaluation information in dynamic freshwater systems a challenging task. While lake ecosystems gather many complex biogeochemical interactions, they remain constrained by same physical environment mixing transport. It is therefore crucial to obtain system insight. Three-dimensional...
Abstract Studies of future 21 st century climate warming in lakes along altitudinal gradients have been partially obscured by local atmospheric phenomena unresolved models. Here we forced the physical lake model Simstrat with locally downscaled models under three scenarios to investigate impact on 29 Swiss lakes, varying size an gradient. Results from worst-case scenario project substantial change at end duration ice-cover mid high altitude (−2 −107 days), stratification (winter −17 −84...
Abstract. Long-term effects of climate change on lakes globally will include a substantial modification in the thermal regime and oxygen solubility lakes, resulting alteration ecosystem processes, habitats, concentrations critical substances. Recent efforts have led to development long-term model projections lake regimes solubility. However, such are hardly ever confronted with observations extending over multiple decades. Furthermore, global-scale forcing parameters models present several...
Abstract Climate change is contributing to rapid changes in lake ice cover across the Northern Hemisphere, thereby impacting local communities and ecosystems. Using time‐series spanning over 87 yr for 43 lakes we found that interannual variability duration, measured as standard deviation, significantly increased only half of our studied lakes. We observed duration peaked when were, on average, covered by about 1 month, while both longer shorter long‐term mean resulted lower duration. These...
Key Points SOD and HOD contribute equally to hypoxia hypolimnion thickness affects the relative contribution of These observation apply a wide range lakes
Abstract High‐resolution field data, collected during April to October of 2008–2009, were analyzed investigate the quantitative contribution sediment resuspension high‐turbidity events in central Lake Erie. Resuspension distinguished within according turbidity, fluorescence and acoustic backscatter timeseries, as well satellite images. We observed 16 events, causing a total duration ∼20 d (out 344 d) with elevated nearbed turbidity (> 10 NTU). Of these 64% correlated algal biomass,...
A 10,000‐km 2 hypoxic ‘dead zone’ forms, during most years, in the central basin of Lake Erie. To investigate processes driving hypoxia, we conducted a 2‐yr field campaign where mixing lake interior stratification period was examined using current meters and temperature‐loggers data, as well > 600 temperature microstructure profiles, from which turbulent computed. Near‐inertial Poincaré waves drive shear instability, generating ∼ 1‐m amplitude 10‐m wavelength high‐frequency internal with...
We investigated radiatively driven under-ice convection in Lake Onego (Russia) during 3 consecutive late winters. In ice-covered lakes, where the temperature of water is below maximum density, heating upper column induces unstable density distributions leading to gravitational convection. this work, we quantified key parameters characterise convection: (1) effective buoyancy flux, B∗ (driver), and its vertical distribution; (2) convective mixed-layer thickness, hCML (depth scale); (3)...
Abstract Anthropogenic heat emissions into inland waters influence water temperature and affect stratification, nutrient fluxes, deep renewal, biota. Given the increased thermal stress on these systems by growing cooling demands of riparian/coastal infrastructures in combination with climate warming, question arises how to best monitor manage systems. In this study, we investigate local system‐wide physical effects medium‐sized perialpine Lake Biel (Switzerland), influenced point‐source...
Abstract. One-dimensional hydrodynamic models are nowadays widely recognized as key tools for lake studies. They offer the possibility to analyze processes at high frequency, here referring hourly timescales, investigate scenarios and test hypotheses. Yet, simulation outputs mainly used by modellers themselves often not easily reachable outside community. We have developed an open-access web-based platform visualization promotion of easy access model output data updated in near-real time...
Abstract. The understanding of physical dynamics is crucial to provide scientifically credible information on lake ecosystem management. We show how the combination in situ observations, remote sensing data, and three-dimensional hydrodynamic (3D) numerical simulations capable resolving various spatiotemporal scales involved dynamics. This achieved through data assimilation (DA) uncertainty quantification. In this study, we develop a flexible framework by incorporating DA into 3D models....
The extent of littoral influence on lake gas dynamics remains debated in the aquatic science community due to lack direct quantification lateral transport. prevalent assumption diffusive horizontal transport budgets fails explain anomalies observed pelagic concentrations. Here, we demonstrate through high-frequency measurements a eutrophic that daily convective circulation generates littoral-pelagic advective fluxes one order magnitude larger than typical used budgets. These are sufficient...
Abstract. Thermal responses of inland waters to climate change varies on global and regional scales. The extent warming is determined by system-specific characteristics such as fluvial input. Here we examine the impact ongoing two alpine tributaries, Aare River Rhône River, their respective downstream peri-alpine lakes: Lake Biel Geneva. We propagate atmospheric temperature effects into river discharge projections. These, together with anthropogenic heat sources, are in turn incorporated...