A5064935855- Plant Water Relations and Carbon Dynamics
- Tree-ring climate responses
- Hydrology and Watershed Management Studies
- Atmospheric chemistry and aerosols
- Geology and Paleoclimatology Research
- Ultrasonics and Acoustic Wave Propagation
- Forest Biomass Utilization and Management
- Non-Destructive Testing Techniques
- Antibiotic Resistance in Bacteria
- Irrigation Practices and Water Management
- Atmospheric Ozone and Climate
- Antibiotics Pharmacokinetics and Efficacy
- Greenhouse Technology and Climate Control
- Plant responses to water stress
- Soil and Unsaturated Flow
- Gene Regulatory Network Analysis
- Simulation Techniques and Applications
- Geophysical Methods and Applications
- Odor and Emission Control Technologies
- Air Quality and Health Impacts
- Cryospheric studies and observations
- Soil Moisture and Remote Sensing
- Hydrology and Sediment Transport Processes
- Groundwater and Isotope Geochemistry
- Urinary Tract Infections Management
Swiss Federal Institute for Forest, Snow and Landscape Research
2020-2024
ETH Zurich
2021-2024
Amt für Umwelt
2022
World Economic Forum
2022
GeoInformation (United Kingdom)
2022
University of Fribourg
2017
École Polytechnique Fédérale de Lausanne
2016-2017
Present and future climatic trends are expected to markedly alter water fluxes stores in the hydrologic cycle.In addition, demand continues grow due increased human use a growing population.Sustainably managing resources requires thorough understanding of storage flow natural, agricultural, urban ecosystems.Measurements stable isotopes (hydrogen oxygen) cycle (atmosphere, soils, plants, surface water, groundwater) can provide information on transport pathways, sourcing, dynamics, ages, pools...
Central Europe has been experiencing unprecedented droughts during the last decades, stressing decrease in tree water availability. However, assessment of physiological drought stress is challenging, and feedback between soil vegetation often omitted because scarce belowground data. Here we aimed to model Swiss forests' availability 2015 2018 by implementing mechanistic soil-vegetation-atmosphere-transport (SVAT) LWF-Brook90 taking advantage regionalized depth-resolved information. We...
Abstract In ecohydrology, water isotopologues are used to assess potential sources of root uptake by comparing xylem signatures with source signatures. Such comparisons affected the variability and uncertainty isotope plant sources. The tree‐scale stand‐scale variabilities in stem often unknown but important for sampling design estimation assessing tree uptake. Here, we quantified beech, oak spruce trees a mature forest on Swiss plateau. For water, sub‐daily replicates different cardinal...
The hydrogen (δ²H) and oxygen (δ¹⁸O) isotopic signatures of tree rings depend on that the environmental water sources, such as precipitation soil water, taken up by trees (i.e., "source water"). Analyzing δ²H δ¹⁸O is thus a promising approach for reconstructing spatio-temporal origins sources. However, reconstructions remain rare, likely due to methodological challenges, including analysis isotopes in...
Third-generation cephalosporin (3GC)-resistant Enterobacteriaceae are classified as critical priority pathogens, with extended-spectrum β-lactamases (ESBLs) principal resistance determinants. Enmetazobactam (formerly AAI101) is a novel ESBL inhibitor developed in combination cefepime for empirical treatment of serious Gram-negative infections settings where ESBLs prevalent. Cefepime-enmetazobactam has been investigated phase 3 trial patients complicated urinary tract or acute pyelonephritis.
In ecohydrology, water isotopes are used to study root uptake by plants from potential source waters comparing xylem signatures with signatures. Such comparisons affected variability and the uncertainty of measurements in plant waters. Tree-scale stand-scale variabilities isotope composition stem often unknown but important for sampling design estimation when assessing sources tree uptake. Here, we quantified tree-scale isotopic beech, oak, spruce trees a mature forest on Swiss plateau. For...
Abstract. Secondary organic aerosol (SOA) formed by α-pinene and 1,3,5-trimethylbenzene photooxidation under different NOx regimes is simulated using the Master Chemical Mechanism v3.2 (MCM) coupled with an absorptive gas–particle partitioning module. Vapor pressures for individual compounds are estimated SIMPOL.1 group contribution model determining apportionment of reaction products to each phase. We apply chemoinformatic tools harvest functional (FG) composition from simulations estimate...
Corrosion due to adverse environmental conditions can occur for a range of industrial structures, e.g., ships and offshore oil platforms. Pitting corrosion generalized lead the reduction strength thus degradation structural integrity. The nondestructive detection monitoring damage in difficult access areas be achieved using high frequency guided ultrasonic waves propagating along structure. Using standard transducers with single sided structure, two fundamental Lamb wave modes were...
This study revisits the stability of hydromechanical gates for upstream water surface regulation, also known as AMIL gates. are used in irrigation canals, where they often installed series. From regulation perspective, instabilities undesired because generate waves and fluctuations discharge. A mathematical model an gate is described a nonlinear dynamical system, which permits analyzing dynamic interaction between local level position. The feedback effect on introduced by considering storage...
Although the hydrogen (δ2H) and oxygen (δ18O) isotopic signature of tree rings is dependent on environmental water, such as precipitation soil water that trees have taken up (i.e. “source water”), estimating spatio-temporal origin sources through analysis stable isotopes in not a straightforward approach. This because 1) our knowledge contribution variability individual fractionation steps between source limited, 2) situ measurements consider seasonality...
Soil-vegetation systems partition incoming precipitation into either the freshwater system ("blue water") or back to atmosphere as evapotranspiration ("green water"). The isotope signatures of these fluxes are observed be distinct. We investigate partitioning and illustrate one potential mechanism for this "apparent" isotopic fractionation root water uptake by means an isotope-enabled mechanistic balance model [1]. Stable were collected at a Swiss forest site dominated beech trees (>60 cm...
Abstract. Stable isotope ratios of hydrogen (δ2H) and oxygen (δ18O) are crucial for studying ecohydrological dynamics in forests. However, most studies confined to single sites, resulting a lack large-scale data understanding tree water uptake. Here, we provide first systematic dataset soil stem xylem collected during two pan-European sampling campaigns at 40 beech (Fagus sylvatica), spruce (Picea abies), or mixed beech-spruce forest sites spring summer 2023 (Lehmann et al., 2024). The is...
Abstract Mechanistic vegetation models serve to estimate terrestrial carbon fluxes and climate impacts on ecosystems across diverse biotic abiotic conditions. Systematically informing them with data is key for enhancing their predictive accuracy estimating uncertainty. Here we present the Simulating Optimal FUNctioning {rsofun} R package, providing a computationally efficient parallelizable implementation of P-model site-scale simulations ecosystem photosynthesis, complemented...
<p>Recent advances in stable isotope measurements within the soil-plant-atmosphere continuum have paved way to high-resolution sub-daily observations of plant water supply (Stumpp et al. 2018, Volkmann 2016a, 2016b). It seems time is ripe for in-depth assessments long-standing yet much-debated assumptions such as complete, homogenous mixing vadose zone (“one world” versus "two world") or absence fractionation during root uptake and...
<p>Processes in the rooting zone and root water uptake decisively affect ecosystem resilience to stressors such as drought or deposition of air pollutants. However, is literally a black box. Water stable isotopes may shed light on some parts this box tell us about residence times, mixing different pools, plant sources, preferential flow, soil evaporation, many more. While flexibility use advantageous, it also entails degrees freedom. The additional collinearity hydrogen oxygen...
<p>The water balance in forest soils is strongly affected by vertical distribution of root uptake. Our objective to constrain the parametrization uptake field using naturally occurring, seasonal variability stable isotope signatures precipitation trace fluxes through soil and into trees.</p> 1D hydrologic model LWFBrook90.jl contains necessary processes accurately reproduce hydrometric observations volumetric moisture content matric potential at sites Switzerland....