A5021801263- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Geology and Paleoclimatology Research
- Arctic and Antarctic ice dynamics
- Meteorological Phenomena and Simulations
- Atmospheric chemistry and aerosols
- Cryospheric studies and observations
- Atmospheric aerosols and clouds
- Methane Hydrates and Related Phenomena
- Atmospheric Ozone and Climate
- Groundwater and Isotope Geochemistry
- Marine and coastal ecosystems
- Landslides and related hazards
- Climate change and permafrost
- Isotope Analysis in Ecology
- Tree-ring climate responses
- Nuclear Physics and Applications
- Aeolian processes and effects
- Spacecraft and Cryogenic Technologies
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Winter Sports Injuries and Performance
- Oceanographic and Atmospheric Processes
- Sensor Technology and Measurement Systems
- Solar and Space Plasma Dynamics
University of Vienna
2021-2025
Earth and Space Research
2019-2023
University of Washington
2019-2023
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2023
ETH Zurich
2015-2018
Norwegian Meteorological Institute
2015-2016
With the Arctic rapidly changing, needs to observe, understand, and model changes are essential. To support these needs, an annual cycle of observations atmospheric properties, processes, interactions were made while drifting with sea ice across central during Multidisciplinary Observatory for Study Climate (MOSAiC) expedition from October 2019 September 2020. An international team designed implemented comprehensive program document characterize all aspects system in unprecedented detail,...
Abstract Frequency and intensity of warm moist air-mass intrusions into the Arctic have increased over past decades been related to sea ice melt. During our year-long expedition in remote central Ocean, a record-breaking increase temperature, moisture downwelling-longwave radiation was observed mid-April 2020, during an intrusion carrying air pollutants from northern Eurasia. The two-day intrusion, caused drastic changes aerosol size distribution, chemical composition particle...
Abstract The deuterium excess ( d ) is a useful measure for nonequilibrium effects of isotopic fractionation and can therefore provide information about the meteorological conditions in evaporation regions or during ice cloud formation. In addition to fractionation, two other change phase transitions. first dependence equilibrium factors on temperature, second nonlinearity δ scale which defined. effect be avoided by using an alternative definition that based logarithmic scale. However, this...
Abstract. In early 2020, an international team set out to investigate trade-wind cumulus clouds and their coupling the large-scale circulation through field campaign EUREC4A: ElUcidating RolE of Clouds-Circulation Coupling in ClimAte. Focused on western tropical Atlantic near Barbados, EUREC4A deployed a number innovative observational strategies, including large network water isotopic measurements collectively known as EUREC4A-iso, study shallow convective environment. The goal was...
Abstract. Numerical methods and simulation codes are essential for the advancement of our understanding complex atmospheric processes. As technology computer hardware continue to evolve, development sophisticated code is vital accurate efficient simulations. In this paper, we present recent advancements made in FLEXPART, a Lagrangian particle dispersion model, which has been used wide range transport studies over past three decades, extending from tracing radionuclides Fukushima nuclear...
Abstract The fate of the West Antarctic Ice Sheet (WAIS) 1 is largest cause uncertainty in long-term sea-level projections. In last interglacial (LIG) around 125,000 years ago, data suggest that sea level was several metres higher than today 2–4 , and required a significant contribution from ice loss, with WAIS usually implicated. Antarctica Southern Ocean were warmer 5–8 by amounts comparable to those expected 2100 under moderate high future warming scenarios. However, direct evidence about...
Computer mirrors are important for studying air. Most computer about fixed points in space and time. This approach is good many studies, but studies focused on going through the air could use moving We made a mirror using time all world winds from Everyone can this mirror. It be used to study dry wet times, water hot air, long air-situations. will present some uses of
In September 2024, cyclone Boris brought intense precipitation to Central and Eastern Europe, causing severe flooding in Austria, Czech Republic, Poland, neighboring countries. Understanding the processes that led this event is important for improving prediction mitigation of similar events future. Here we trace origin transport pathways moisture contributing during using a Lagrangian source diagnostic. The results show evapotranspiration from land played more role than previously thought:...
In this study, we present and analyze the first continuous time series of relevant aerosol precursorvapors from central Arctic (north 80° N) during Multidisciplinary drifting Observatory for Study ofArctic Climate (MOSAiC) expedition. These precursor vapors include sulfuric acid (SA), methanesulfonic acid(MSA), iodic (IA). We use FLEXPART simulations, inverse modeling, sulfur dioxide (SO2) mixingratios, chlorophyll a (chl a) observations to interpret seasonal variability in vapor...
Abstract. Meteorological reanalyses are crucial datasets in atmospheric research, providing the foundation for many scientific applications. However, most follow a Eulerian framework, data at specific, fixed points space and time. This fixed-location approach is suitable analyses, but studies focused on transport atmosphere would benefit from Lagrangian which provides along dynamic, continuous trajectories following movement of air. To achieve this, particle dispersion model FLEXPART was...
Abstract The evolution of tropical anvil clouds from their origin in deep convective cores to slow decay determines the climatic effects regions. Despite relevance for climate and responses global warming, processes dominating are not well understood. Currently available observational data reveal instantaneous snapshots cloud properties, but cannot provide a process‐based perspective on evolution. We therefore conduct simulations with high resolution version exascale earth system model which...
Abstract The West Antarctic Ice Sheet (WAIS) may have collapsed during the last interglacial period, between 132 000 and 116 years ago. changes in topography resulting from WAIS collapse would be accompanied by significant surface climate, atmospheric circulation, ocean conditions. Evidence of these recorded water-isotope ratios precipitation archived ice. We conduct high-resolution simulations with an isotope-enabled version Weather Research Forecasting Model over Antarctica, boundary...
Abstract Supersaturation with respect to ice determines the strength of nonequilibrium fractionation during vapor deposition onto or snow and therefore influences water isotopic composition precipitation in cold environments. Historically, most general circulation models formed clouds through saturation adjustment prevented supersaturation. To match observed content, especially deuterium excess, polar regions, ratio ( S i ) was parameterized, usually by assuming a linear dependence on...
Abstract Numerical model simulations of stable water isotopes help to improve our understanding the complex processes driving isotopic variability in atmospheric moisture. We use isotope‐enabled Consortium for Small‐Scale Modelling (COSMO) study governing mechanisms δ 2 H variations an idealized extratropical cyclone. A set experiments with differing initial conditions vapor and partly deactivated fractionation allows us quantify relative roles cloud vertical horizontal advection simulated...
Abstract. Stable water isotopes are naturally available tracers of moisture in the atmosphere. Due to isotopic fractionation, they record information about condensation and evaporation processes during transport air parcels, therefore present a valuable means for studying global cycle. However, meteorological driving variations complex not very well understood so far, particular on short (hourly daily) timescales. This study presents Lagrangian method attributing composition parcels...
Abstract The Arctic is experiencing unprecedented moistening which expected to have far‐reaching impact on global climate and weather patterns. However, it remains unclear whether this newly sourced moisture originates locally from ice‐free ocean regions or advected lower latitudes. In study, we use water vapor isotope measurements in combination with trajectory‐based diagnostics an isotope‐enabled atmosphere general circulation model, assess seasonal shifts sources transport pathways the...
Abstract. Naturally available, stable, and heavy water molecules such as HDO H218O have a lower saturation vapour pressure than the most abundant light molecule H216O; therefore, these preferentially condense rain out during cloud formation. Stable isotope observations thus potential to provide information on processes in trade-wind region, particular when combined with high-resolution model simulations. In order evaluate this potential, nested COSMOiso (isotope-enabled Consortium for Small...
Abstract. In early 2020, an international team set out to investigate trade wind cumulus and their coupling the large-scale circulation through field campaign EUREC4A: ElUcidating RolE of Clouds‐Circulation Coupling in ClimAte. Focused on western tropical Atlantic near Barbados, EUREC4A deployed a number innovative observational strategies, including large network water isotopic measurements, study shallow convective environment. The goal measurements was elucidate processes that regulate...
Abstract. Numerical methods and simulation codes are essential for the advancement of our understanding complex atmospheric processes. As technology computer hardware continue to evolve, development sophisticated code is vital accurate efficient simulations. In this paper, we present recent advancements made in FLEXible PARTicle dispersion model (FLEXPART), a Lagrangian particle model, which has been used wide range transport studies over past 3 decades, extending from tracing radionuclides...
<title>Abstract</title> In the central Arctic, warm and moist air intrusions (WAMIs) are increasingly prevalent during winter spring, significantly impacting near-surface energy budget. This study investigates WAMI-induced transport wet deposition of black carbon (BC) its subsequent influence on snow properties melting. Using a modeling approach combined with extensive observational data from 2019–2020 Multidisciplinary drifting Observatory for Study Arctic Climate (MOSAiC) expedition, we...
Abstract. In this study, we present and analyze the first continuous time series of relevant aerosol precursor vapors from central Arctic (north 80° N) during Multidisciplinary drifting Observatory for Study Climate (MOSAiC) expedition. These include sulfuric acid (SA), methanesulfonic (MSA), iodic (IA). We use FLEXPART simulations, inverse modeling, sulfur dioxide (SO2) mixing ratios, chlorophyll a (chl a) observations to interpret seasonal variability in vapor concentrations identify...
Abstract Paleotemperature reconstructions from ice cores are mixed signals of changes in climate and ice‐surface elevation. A common, temperature‐based paleoaltimetry method suggests these can be disentangled by comparing two proxy locations with similar climates. The difference between the records is assumed to due elevation, which estimated scaling temperature a lapse rate. We investigate uncertainty associated this approach using case study Antarctic Ice Sheet during Last Glacial Maximum....