Gabriel Chiodo

My group



Marina Friedel

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PhD thesis (2020-2023) at ETH-Zurich. See IAC-ETH website

Short Bio: Marina studied physics at the University of Tübingen, Germany, including a stay at the University of Cape Town, South Africa. During her studies, she mainly focused on elementary particle physics and the application of particle physics for medical purposes. For her Master’s thesis at the department of radiation oncology at the University hospital in Tübingen, she developed a method for the quality assurance of magnetic-resonance guided radiotherapy using Monte-Carlo simulations (See webpage).

Project description: In her PhD thesis, she will assess the influence of Arctic ozone on Northern hemispheric climate examining its feedback on stratosphere-troposphere coupling and surface projections on various time scales. She will explore the mechanisms whereby ozone affects the circulation, such as zonal asymmetries in the distribution of Arctic ozone, as well as the impact of uncertainties in future ozone trends and their influence on projections of Northern hemisphere climate change. Her thesis is supervised by Prof. T. Peter and myself, and is part of the SNF-funded TORSO project, which I am leading.

Sandro Vattioni

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PhD thesis (2020-2023) at ETH-Zurich. See IAC-ETH website

Short Bio: Sandro studied Earth Sciences at ETH Zurich. For his Masters, he focused on atmospheric and climate sciences including a semester abroad at Hong Kong University of Science and Technology. Sandro conducted his Master's thesis at Harvard University in the group of Prof. David Keith at the School of Engineering and Applied Science. In his Master's thesis, he used a global aerosol chemistry climate model to investigate microphysical and chemical impacts of various stratospheric solar geoengineering sulfate emission scenarios (see paper). Sandro is a weather officer in the Swiss armed forces where he served for about 2 years, and where he soon will be going to be geography teacher at secondary education level.

Project description: In his PhD thesis, Sandro will work on the chemical and climatic impacts of solid particles for stratospheric solar geo-engineering. He will perform exploratory work, which includes in a first step various lab experiments to investigate the chemical and microphysical interactions of calcite and alumina particles in stratospheric conditions. In a second step the results of the lab experiments will be used to build parameterizations in the global aerosol chemistry climate model SOCOL-AER-MPIOM. The model will then be used to investigate the impacts of stratospheric solar geoengineering by solid aerosols on stratospheric chemistry (including ozone) and dynamics as well as climate feedbacks in general. The project includes collaborations with various institutes and laboratories at ETH Zurich, Paul Scherrer Institute and the Keutsch group at Harvard University. His thesis is supervised by Prof. T. Peter and myself, and is part of an ETH Research Grant on Stratospheric Solar Geoengineering, which I am leading.

Jessica Oehrlein

PhD thesis (2018-2021) at Columbia University (co-supervised with Prof. L.M.Polvani). See CU website

Project description: Jessie holds a MSc degree in applied mathematics from Columbia University. She completed a MSc project on the connection between solar variability and North Atlantic climate, which resulted in a paper published in the prestigious Nature Geoscience journal (see here). For her PhD, she investigated Sudden Stratospheric Warmings, their drivers (e.g. ENSO) and impacts on tropospheric climate, including the effects of interactive ozone, and the role of natural variability in the surface signature of SSWs. Her thesis has been supervised by Prof. L.M. Polvani and myself.

Nora Bergner

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Master thesis (2021) at ETH-Zurich

Project description: Nora recently completed a MSc project on The Role of Antarctic Stratospheric Vortex and Ozone Variability in Forcing Surface Climate. More specifically, she assessed the relationship between Antarctic stratospheric vortex variability and the Southern Annular Mode, as well as regional climate in the Southern Hemisphere in re-analysis and coupled chemistry climate model (CCM) simulations. In particular, she quantified the impact of interactive ozone chemistry on stratosphere-troposphere coupling, with emphasis on the surface signature of polar vortex variability. Her research shows that ozone feedbacks introduce persistence in the stratosphere, but that dynamical coupling irrespective of ozone variability plays a dominant role on tropospheric and surface signals. However, CCMs underestimate ozone variability compared to the observations, and overestimate the lifetime of the polar vortex. A paper about the results of this research project is in preparation.

Laura Endres

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Master thesis (2021) at ETH-Zurich

Project description: Laura is currently completing a MSc project on "Revisiting the Influence of Solar Variability on North Atlantic Winter Climate". In this project, Laura is examining the relationship between solar variability and the North Atlantic Oscillation (NAO), by using sets of simulations from three coupled chemistry-climate models (SOCOL-MPIOM, WACCM and GISS-E2-1) and re-analysis (ERA5 and ERA-20C). She compares transient (historical) simulations as well as idealized runs with and without the solar cycle to find a better-constrained estimate of the strength and character of the solar influence on the North Atlantic Oscillation. In particular, she explores the coherence between atmospheric variables and solar forcing, by performing detailed time-frequency analysis using different spectral analysis methods such as wavelets and multi-taper spectra. This work aims at providing improved statistical constraints on the solar-NAO connection from models and observations, with implications for predictability of North Atlantic winter climate.