A5003891927- Atmospheric and Environmental Gas Dynamics
- Plant Water Relations and Carbon Dynamics
- Atmospheric chemistry and aerosols
- Methane Hydrates and Related Phenomena
- Spectroscopy and Laser Applications
- Hydrocarbon exploration and reservoir analysis
- Vehicle emissions and performance
- Hydrology and Watershed Management Studies
- Urban Heat Island Mitigation
- Climate variability and models
- Tree-ring climate responses
- Plant responses to elevated CO2
- Groundwater flow and contamination studies
- Landfill Environmental Impact Studies
- Wind and Air Flow Studies
- Atmospheric Ozone and Climate
- CO2 Sequestration and Geologic Interactions
- Coal Properties and Utilization
- Environmental and Agricultural Sciences
- Air Quality Monitoring and Forecasting
- Meteorological Phenomena and Simulations
- Traffic Prediction and Management Techniques
- Geophysics and Gravity Measurements
- Forest ecology and management
- Robotics and Automated Systems
Swiss Federal Laboratories for Materials Science and Technology
2013-2014
ETH Zurich
2010-2014
Federal Office of Meteorology and Climatology MeteoSwiss
2014
University of Bern
2008
University of Minnesota
2008
Since the European summer heat wave of 2003, considerable attention has been paid to impacts exceptional weather events on terrestrial ecosystems. While our understanding effects drought ecosystem carbon and water vapour fluxes recently advanced, spring remain unclear. In Switzerland, 2011 (March–May) was warmest among driest since beginning meteorological measurements. This study synthesizes Swiss FluxNet data from three grassland two forest ecosystems investigate this drought. Across all...
Evapotranspiration is an important term of energy and water budgets in urban areas responsible for multiple ecosystem services provided by vegetation.The spatial heterogeneity surface types with different seasonal use patterns (e.g., trees turfgrass lawns) complicates efforts to predict manage evapotranspiration rates, necessitating a type, or component-based, approach.In suburban neighborhood Minneapolis-Saint Paul, Minnesota, United States, we simultaneously measured its main component...
Abstract. Fast response optical analyzers based on laser absorption spectroscopy are the preferred tools to measure field-scale mixing ratios and fluxes of a range trace gases. Several state-of-the-art instruments have become commercially available gaining in popularity. This paper aims for critical field evaluation intercomparison two compact, cryogen-free fast instruments: quantum cascade spectrometer from Aerodyne Research, Inc., an off-axis integrated cavity output Los Gatos Inc. In this...
Turf-grass lawns are ubiquitous in the United States. However direct measurements of land–atmosphere fluxes using eddy-covariance method above lawn ecosystems challenging due to typically small dimensions and heterogeneity land use an urbanised landscape. Given their patch sizes, there is potential that CO2 measured turf-grass may be influenced by nearby sources such as passing traffic. In this study, we report on two years flux a 1.5 ha which assess contribution traffic emissions flux. We...
For regional‐scale investigations of greenhouse gas budgets the spatially explicit information from local emission sources is needed, which then can be compared with flux measurements. Here we present first validation a section CH 4 inventory Switzerland. The was done for agriculturally dominated Reuss Valley using measurements low‐flying aircraft (50–500 m above ground level). We distributed national estimates to grid 500 cell size available geostatistical data. Validation were obtained...
Abstract. We present the first high-resolution (500 m × 500 m) gridded methane (CH4) emission inventory for Switzerland, which integrates 90 % of national totals reported to United Nations Framework Convention on Climate Change (UNFCCC) and recent CH4 flux studies conducted by research groups across Switzerland. In addition anthropogenic emissions, we also include natural semi-natural fluxes, i.e., emissions from lakes reservoirs, wetlands, wild animals as well uptake forest soils. National...
Abstract. Recently, instruments became available on the market that provide possibility to perform eddy covariance flux measurements of CH4 and many other trace gases, including traditional CO2 H2O. Most these employ laser spectroscopy, where a cross-sensitivity H2O is frequently observed leading an increased dilution effect. Additionally, sorption processes at intake tube walls modify delay signal in closed-path systems more strongly than sampled gas. Thereby, phase shift between gas...
Abstract. Alpine grasslands are an important source of fodder for the cattle farmers. Only during short summer season can these pastures be used grazing. With anticipated climate change, it is likely that plant production – and thus basis will influenced. Investigating dependence biomass on topoclimatic factors allow us to better understand how change may influence this traditional farming system. Because small-scale topoclimatological variations main meteorological variables: temperature,...
Abstract. We present the first high-resolution (500 m × 500 m) gridded methane (CH4) emission inventory for Switzerland, which integrates national totals reported to United Nations Framework Convention on Climate Change (UNFCCC) and recent CH4 flux studies conducted by research groups across Switzerland. In addition anthropogenic emissions, we also include natural semi-natural fluxes, i.e., emissions from lakes reservoirs, wetlands, wild animals as well uptake forest soils. National were...
Abstract. Fast response optical analyzers based on laser absorption spectroscopy are the preferred tools to measure field-scale mixing ratios and fluxes of a range trace gases. Several state-of-the-art instruments have become commercially available gaining in popularity. This paper aims for critical field evaluation intercomparison two compact, cryogen-free fast instruments: quantum cascade spectrometer from Aerodyne Research, Inc., an off-axis integrated cavity output Los Gatos Inc. In this...