A5065321555- Hydrology and Watershed Management Studies
- Cryospheric studies and observations
- Climate change and permafrost
- Precipitation Measurement and Analysis
- Groundwater and Isotope Geochemistry
- Flood Risk Assessment and Management
- Tree-ring climate responses
- Meteorological Phenomena and Simulations
- Hydrological Forecasting Using AI
- Groundwater flow and contamination studies
- Nuclear Physics and Applications
- Environmental DNA in Biodiversity Studies
- NMR spectroscopy and applications
- Geophysics and Gravity Measurements
- Climate variability and models
- Arctic and Antarctic ice dynamics
- Environmental Monitoring and Data Management
- Landslides and related hazards
- Plant Water Relations and Carbon Dynamics
- Soil Moisture and Remote Sensing
- Hydrology and Drought Analysis
- Water-Energy-Food Nexus Studies
- Forest ecology and management
- Soil erosion and sediment transport
- Geology and Paleoclimatology Research
ETH Zurich
2021-2023
University of Lausanne
2017-2021
Indian Institute of Technology Kharagpur
2015-2016
Snowfall may have different stable isotopic compositions compared with rainfall, allowing its contribution to potentially be tracked through the hydrological cycle. This review summarizes state of knowledge how hydrometeorological processes affect composition snow in forms (snowfall, snowpack, and snowmelt), and, selected examples, discusses water isotopes can provide a better understanding processes. A detailed account is given variability changes from precipitation final melting. The...
Abstract Estimation of young water fractions ( F yw ), defined as the fraction in a stream younger than approximately 2–3 months, provides key information for resource management catchments where runoff is dominated by snowmelt. Knowing average dependence summer flow on winter precipitation an essential context comparing regional drought severity and hydrological template downstream users ecosystems. However, estimation based seasonal signals stable isotopes oxygen hydrogen has not yet...
Abstract. The last couple of decades have seen the outburst a number satellite-based precipitation products with Tropical Rainfall Measuring Mission (TRMM) as most widely used for hydrologic applications. Transition TRMM into Global Precipitation Measurement (GPM) promises enhanced spatio-temporal resolution along upgrades to sensors and rainfall estimation techniques. dependence systematic error components in estimates Integrated Multi-satellitE Retrievals GPM (IMERG), their variation...
Abstract. Hydrological processes in high-elevation catchments are strongly influenced by alternating snow accumulation and melt addition to summer rainfall. Although diverse water sources flow paths that generate streamflow the world's towers emerge from these two driving inputs, a detailed process understanding remains poor. We measured combination of natural tracers at high frequency, including stable isotope compositions, electrical conductivity (EC), soil temperature characterize...
Abstract. About 80 % of the precipitation at Colorado River's headwaters is snow, and resulting snowmelt-driven hydrograph a crucial water source for about 40 million people. Snowmelt from alpine subalpine snowpack contributes substantially to groundwater recharge river flow. However, dynamics snowmelt progression are not well understood because observations high-elevation difficult due challenging access in complex mountainous terrain as cost labor intensity currently available methods. We...
Abstract. Hydrological fluxes typically vary across seasons, with several existing metrics available to characterize their seasonality. These are beneficial when many catchments diverse climates and landscapes studied concurrently. Here, we present directional statistics streamflow seasonality, capturing the timing of (center mass) strength its seasonal cycle (concentration). We show that is mathematically more robust than widely used quantify extend application analyse seasonality in other...
The EU-Horizon project CryoSCOPE, launched in February 2025, investigates the interplay between atmospheric, cryospheric, and hydrologic systems across varied landscapes, including Swiss Alps, Finnish Lapland, Svalbard, Himalayas. A key focus CryoSCOPE is to quantify partitioning—how precipitation distributed among streamflow, groundwater, evapotranspiration—in snow-dominated environments. By integrating stable water isotope data different hydrological fluxes,...
Climate change is projected to substantially reduce snow availability, posing significant challenges for downstream sectors such as ski resort operations, aquatic ecosystems, and hydropower, which are heavily reliant on seasonal snowmelt streamflow dynamics. This study presents, the first time, high-resolution (1x1 km²) daily projections of cover water equivalent (SWE) Switzerland under different global warming levels. These derived from an ensemble over 25 statistically downscaled...
Abstract. Spatial rainfall patterns exert a key control on the catchment-scale hydrologic response. Despite recent advances in radar-based sensing, observation remains challenge, particularly mountain environments. This paper analyzes importance of high-density observations for 13.4 km2 catchment located Swiss Alps, where events were monitored during 3 summer months using network 12 low-cost, drop-counting rain gauges. We developed data-based analysis framework to assess help predict...
Abstract In ice‐covered lakes, near‐bottom oxygen concentration decreases for most of the wintertime, sometimes down to point that bottom waters become hypoxic. Studies insofar have reached divergent conclusions on whether climate change limits or reinforces extent and duration hypoxia under ice, raising need a comprehensive understanding drivers dissolved (DO) dynamics lake ice. Using high‐temporal resolution time series DO temperature across 14 mountain we showed ice varies from 0 236 d...
Abstract. Tracers have been used for over half a century in hydrology to quantify water sources with the help of mixing models. In this paper, we build on classic Bayesian methods uncertainty ratios. Such infer probability density function (PDF) ratios by formulating PDFs source and target concentrations inferring underlying via Monte Carlo sampling. However, collected hydrological samples are rarely abundant enough robustly fit PDF concentrations. Our approach, called HydroMix, solves...
Snowfall may have different stable isotopic compositions compared to rainfall, allowing its contribution potentially be tracked through the hydrological cycle. This review summarizes state of knowledge how hydro-meteorological processes affect composition snow, and, selected examples, discusses water isotopes can provide a better understanding snow processes. A detailed account is given variability in changes from precipitation final melting. The effect ablation (sublimation, melting, and...
Abstract. Hydrological processes in high elevation catchments are largely influenced by snow accumulation and melt, as well summer rainfall input. The use of the stable isotopes water a natural tracer has become popular over recent years to characterize flow paths storage such environments, conjunction with electric conductivity (EC) temperature measurements. In this work, we analyzed detail potential year round samples these tracers hydrological snow-dominated Alpine catchment. Our results...
Abstract. Last couple of decades have seen the outburst a number satellite based precipitation products with Tropical Rainfall Measuring Mission (TRMM) as most widely used for hydrologic applications. Transition TRMM into Global Precipitation (GPM) promises enhanced spatio-temporal resolution along upgrades in sensors and rainfall estimation techniques. Dependence systematic error components estimates Integrated Multi-satellitE Retrievals GPM (IMERG), their variation climatology topography,...
Abstract. Spatial rainfall patterns exert a key control on the catchment scale hydrologic response. Despite recent advances in radar-based sensing, observation remains challenge particularly mountain environments. This paper analyzes importance of high-density observations for 13.4 km2 located Swiss Alps where summer events were monitored during 3 months using network 12 low-cost, drop-counting rain gauges. We developed data-based analysis framework to assess help constrain processes. The is...
The hydrologic cycle in Switzerland relies on inputs from winter precipitation, whereby snowmelt plays an important role replenishing soil water, streams and aquifers. Previous studies found that plant water uptake during the summer growing season is dominated by precipitation. Here we use stable isotope data of xylem four experimental catchments two snapshot sampling campaigns to assess what drives seasonal patterns signatures. We unveil divergent trends origin waters used trees compared...
Abstract. Tracers have been used for over half a century in hydrology to quantify water sources with the help of mixing models. In this paper, we build on classic Bayesian methods uncertainty ratios. Such infer probability density function (pdf) ratios by formulating pdfs source and target concentrations inferring underlying via Monte Carlo sampling. However, collected hydrological samples are rarely abundant enough robustly fit pdf sources. Our approach, called HydroMix, solves linear...
<p>The last century of hydrological research has led to significant improvements in representing different processes rainfall-runoff models. With widely available streamflow data, such models are typically calibrated against this reference time series, which can limit their predictive power. One option improve the realism is by incorporating environmental tracers as stable isotopes water, water temperature and electrical conductivity within modeling setup. Conventionally, have...