Gabriel Chiodo

My group

Marina Friedel

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PhD thesis (2020-present) 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 entitled "The role of Arctic ozone in forcing Northern Hemispheric climate", she is assessing 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-present) 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.


Rahel Weber

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Master thesis (01/2022-09/2022) at ETH-Zurich

Project description: In her MSc thesis entitled "Impacts on Stratospheric Chemistry by Stratospheric Aerosol Injection via Solid Particles", Rahel has investigated the efficiency of Climate Intervention measures using stratospheric aerosol injections in our in-house Chemistry Climate Model SOCOL-AERv2. In particular, she explored the impact of Alumina and Calcite particles on stratospheric chemistry and radiative forcing, with emphasis on the chemical, microphysical and radiative processes governing the atmospheric response to this potential Climate Intervention measure. Her results show that solid particles have generally less side effects compared to sulfate aerosols (e.g. reduced ozone depletion and heating), but the uncertainty related to chemical processes on the surface of the solid particles is large. She is in the process of publishing these results as part of a paper.

Svenja Seeber

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Master thesis (02/2022-08/2022) at ETH-Zurich

Project description: Svenja has completed a MSc project on "Arctic ozone and climate change". In this work, she has been investigating the impact of future ozone recovery on climate. She ran multiple future scenario experiments from two ocean coupled chemistry-climate models: SOCOL-MPIOM and CESM1-WACCM4. More specifically, she explored the influence of Arctic ozone recovery on the large-scale atmospheric circulation via radiative and dynamical processes, elucidating the relative roles of ozone vs GHGs (e.g. CO2). Her results show that ozone recovery has a major impact on the thermal structure of the stratosphere, and opposes the effects of CO2. Initial results also reveal sizable impacts on stratospheric dynamics. The results of this work will be part of a paper on climatic impacts of ozone recovery.

Konstantin Weber

Graduate Research Project (03/2022-09/2022) at ETH-Zurich

Project description: Konstantin has worked on a research project on "The climatic impacts of halocarbons in CMIP6 models". In this work, he performed a multi-model intercomparison of the effects of halocarbons (HC) on climate, by using the new AerChemMIP model experiments, which were performed as part of CMIP6. HC species include ozone depleting substances, which played a major role in thinning the ozone layer over 1960-2000, but also have a large global warming potential (GWP), due to their strong absorption in the infrared spectrum. Initial results show that HC contributed to global warming over the second half of the 20th century, but the degree to which HC warmed climate strongly varies across climate models. Part of the uncertainty in the climatic impact of HCs is related to differences in the climate models sensitivity, and part of it is related to model-dependency in the simulated severity of historical ozone depletion. Presently, we are adding more ensemble members to improve the detection of the (small) HC signal in global warming.

Jessica Oehrlein

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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 Nature Geoscience (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.

Jessie is now Assistant Professor in Mathematics at Fitchburg State University. See website

Nora Bergner

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Master thesis (finalized on 09/2021) 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 in under review at Atmospheric Chemistry and Physics (see paper).

Nora is now PhD candidate in Civil and Environmental Engineering at EPFL. See website

Laura Endres

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Master thesis (finalized on 09/2021) at ETH-Zurich

Project description: Laura recently completed a MSc project on "Revisiting the Influence of Solar Variability on North Atlantic Winter Climate". In this project, Laura examined 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 compared 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 explored 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 provides improved statistical constraints on the solar-NAO connection from models and observations, with implications for predictability of North Atlantic winter climate.

Laura is now PhD candidate at the Department of Earth Sciences (D-HEST) at ETH-Zurich. See website