A5011579041- Climate variability and models
- Plant Water Relations and Carbon Dynamics
- Meteorological Phenomena and Simulations
- Hydrology and Watershed Management Studies
- Atmospheric and Environmental Gas Dynamics
- Hydrology and Drought Analysis
- Soil Moisture and Remote Sensing
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Climate change impacts on agriculture
- Climate change and permafrost
- Flood Risk Assessment and Management
- Climate Change and Health Impacts
- Climate Change Policy and Economics
- Tree-ring climate responses
- Fire effects on ecosystems
- Plant Ecology and Soil Science
- Geology and Paleoclimatology Research
- Precipitation Measurement and Analysis
- Water-Energy-Food Nexus Studies
- Water resources management and optimization
- demographic modeling and climate adaptation
- Solar and Space Plasma Dynamics
- Soil and Unsaturated Flow
- Atmospheric chemistry and aerosols
ETH Zurich
2016-2025
Board of the Swiss Federal Institutes of Technology
2006-2024
Institute of Atmospheric Sciences and Climate
2010-2022
Swiss Epilepsy Center
2022
Columbia University
2019
ARC Centre of Excellence for Climate System Science
2015
UNSW Sydney
2015
Hess (United States)
2012
Weatherford College
2011-2012
Goddard Space Flight Center
2004-2007
A holistic perspective on changing rainfall-driven flood risk is provided for the late 20th and early 21st centuries. Economic losses from floods have greatly increased, principally driven by expanding exposure of assets at risk. It has not been possible to attribute rain-generated peak streamflow trends anthropogenic climate change over past several decades. Projected increases in frequency intensity heavy rainfall, based models, should contribute precipitation-generated local flooding...
The role of land surface–related processes and feedbacks during the record-breaking 2003 European summer heat wave is explored with a regional climate model. All simulations are driven by lateral boundary conditions sea surface temperatures from ECMWF operational analysis 40-yr Re-Analysis (ERA-40), thereby prescribing large-scale circulation. In particular, contribution soil moisture anomalies their interactions atmosphere through latent sensible fluxes investigated. Sensitivity experiments...
Abstract Droughts and heatwaves cause agricultural loss, forest mortality, drinking water scarcity, especially when they occur simultaneously as combined events. Their predicted increase in recurrence intensity poses serious threats to future food security. Still today, the knowledge of how droughts start evolve remains limited, so does our understanding climate change may affect them. have been suggested intensify propagate via land–atmosphere feedbacks. However, a global capacity observe...
Compound climate extremes are receiving increasing attention because of their disproportionate impacts on humans and ecosystems. However, risks assessments generally focus univariate statistics. We analyze the co-occurrence hot dry summers show that these correlated, inducing a much higher frequency concurrent than what would be assumed from independent combination Our results demonstrate how dependence structure between variables affects occurrence multivariate extremes. Assessments based...
Most of the recent European summer heat waves have been preceded by a pronounced spring precipitation deficit. The lack and associated depletion soil moisture result in reduced latent cooling thereby amplify temperature extremes. In order to quantify contribution land‐atmosphere interactions, we conduct regional climate simulations with without coupling for four selected major 1976, 1994, 2003, 2005. coupled simulation uses fully land‐surface model, while uncoupled mean seasonal cycle is...
Global warming increases the occurrence probability of hot extremes, and improving predictability such events is thus becoming critical importance. Hot extremes have been shown to be induced by surface moisture deficits in some regions. In this study, we assess whether a relationship holds at global scale. We find that wide areas world display strong between number days regions’ hottest month preceding precipitation deficits. The an above-average over 70% after most parts South America as...
Abstract Dryness stress can limit vegetation growth and is often characterized by low soil moisture (SM) high atmospheric water demand (vapor pressure deficit, VPD). However, the relative role of SM VPD in limiting ecosystem production remains debated difficult to disentangle, as are coupled through land-atmosphere interactions, hindering ability predict responses dryness. Here, we combine satellite observations solar-induced fluorescence with estimates show that dominant driver dryness on...
The respiratory release of carbon dioxide (CO(2)) from the land surface is a major flux in global cycle, antipodal to photosynthetic CO(2) uptake. Understanding sensitivity processes temperature central for quantifying climate-carbon cycle feedback. We approximated terrestrial ecosystem respiration air (Q(10)) across 60 FLUXNET sites with use methodology that circumvents confounding effects. Contrary previous findings, our results suggest Q(10) independent mean annual temperature, does not...