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Faculty for Biology, Chemistry and Earth Sciences

Junior Professorship Atmospheric Chemistry - Prof. Dr. Anke Nölscher

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Anke Nölscher: Theses supervised

Bachelor's Theses
Benedikt Huebner (2023) BVOC Emissions from two Maize Varieties as Drought Stress Indicators

In this study, we sought to determine the impact of drought stress and temperature on the biogenic volatile organic compound (BVOC) emission rates of an old landrace (Pfarrkirchner) and a modern (Benedictio KWS) maize variety. Several maize plants from both varieties were subjected to a drought stress and a nonstress treatment and placed into Plexiglas chambers located in climate cabinets. BVOCs were sampled at several different temperatures and the emission rates were determined using thermal desorption gas chromatography flame ionization detection (TD-GC-FID).

Supervisor: Anke Nölscher, Johanna Pausch
Julian Schultes (2022) Aktive Luftfiltersysteme im Windkanaltest: Welchen Einfluss haben reale Strömungs- und Stickstoffverhältnisse auf die Abscheidewirkung

Eine technische Möglichkeit Stickstoffdioxid (NO2) in der Umgebungsluft zu reduzieren sind aktive Luftfiltersysteme. Diese Bachelorarbeit ist Teil der Pilotstudie "Reinelufft?", die zeigen soll wie wirksam solche Systeme unter realen Bedingungen NO2 filtern können.

Supervisor: Anke Nölscher, Christoph Thomas
Tobias Mayer (2022) Identifikation und Quantifizierung von Reifenabrieb: Methodenentwicklung und Markerkomponententest mit HPLC-MS

Reifenabrieb ist eine bisher nur wenig charakterisierte Quelle für Mikroplastik in der Umwelt. Ziel dieser Bachelorarbeit ist es drei organische Marker darauf zu testen, ob diese zur qualitativen und quantitativen Analyse von Reifenabrieb in Umweltproben mit HPLC-MS geeignet sind.

Supervisor: Anke Nölscher, Sarmite Kernchen
Pia Goecke (2022) Investigating microplastics in the atmosphere around a point source in Bayreuth

The plastic production has increased exponentially in the last 70 years. Not only for packaging, but also in clothes, paints and health care products the use of different polymers plays an important role. While the transport and accumulation of microplastics (MPs) in water is already well investigated, we still know little about MPs in the atmosphere. Therefore, this Bachelor thesis studies the distribution of airborne microplastic particle deposition around a point source in Bayreuth.

Supervisor: Anke Nölscher, Sarmite Kernchen
Maike Rieger (2021) Monoterpene emissions as drought stress indicators in old and modern maize varieties

Drought stress can change the composition of VOC-emissions from plants. Monoterpenes, which are a type of VOC, are known to stabilize the thylakoid membranes and proteins in plants and therefore lead to a higher thermotolerance. The idea of measuring stress in crops by analysing the monoterpene emission rates as non-invasive marker has come up, but not a lot of researchers have tackled this opportunity yet. This Bachelor thesis wants to investigate whether monoterpenes can be used as drought stress indicators in maize. It is embedded in the RhizoTraits project which is exploring the rhizosphere traits of wheat and maize to find out, what traits lead to a higher resistance and resilience to drought. more

Supervisor: Anke Nölscher, Johanna Pausch
Alexander Weiß (2020) Soil sources or sinks for monoterpenes in comparison between agriculturaly used and forest ground more

Supervisor: Anke Nölscher, Eva Lehndorff
Johanna Glaß (2020) Diel and vertical profiles of ozone and nitrogen oxides in urband and forest air

Supervisor: Anke Nölscher, Christoph Thomas
Lina Reichert (2020) The effect of atmospheric micro- and nanoplastics on the production of VOC from the moss Polytrichum formosum

Supervisor: Anke Nölscher, Martin Feulner

Master's Theses
Huaqi Sun (2024) Simulating the OH-initiated photooxidation of decane under urban NOx conditions

Decane can be a precursor for the formation of secondary organic aerosol under urban NOx conditions. This thesis focussed on the OH-initiated oxidation of decane in the controlled set-up of a flow tube. Products in gas- and particle-phase were identified with various methods.

Supervisor: Anke Nölscher, Martin Obst
Hai Anh Nguyen (2023) Experimental Simultaneous Quantification of Water States, Fluxes, and BVOC Exchange in Agricultural Soil

In this thesis, the influences of BVOCs concentration in the atmosphere, the soil water content, and the hysteresis in the soil on the BVOCs exchange in agricultural soil were investigated. During the drying-rewetting periods of pre-saturated soil, the BVOCs mixing ratios before and after entering the soil chamber, as well as the soil water retention, were simultaneously measured.

Supervisor: Anke Nölscher, Efstathios Diamantopoulos
Myriam Younes (2023) Microplastics in the atmospheric deposition of Bayreuth, Germany

Microplastics are small pieces of synthetic polymers with particle sizes of less than 5000 µm. These particles can be transported through the atmosphere and subsequently be deposited far away from their sources, leading to contamination of even remote areas. To date, the relative importance of wet and dry desposition processes for microplastic removal from air remains poorly understood. To address this research gap, we collected and analyzed monthly deposition samples in 2022 and 2023 in Bayreuth, Germany.

Supervisor: Anke Nölscher, Eva Lehndorff
Finja Löher (2023) Assessing yields and reactivity of photooxidation products along the urban-remote gradient by controlled experiments and SPME-GC-MS with on-line derivatization

Atmospheric photooxidation of volatile organic compounds (VOC) has significant effects on the formation of tropospheric ozone and secondary organic aerosol (SOA) as well as for recycling of the OH radical, yet many underlying processes and dependencies are not sufficiently understood to date. In this master thesis, the photooxidation of mixtures of anthropogenic and biogenic VOC is studied.

Supervisor: Anke Nölscher, Martin Obst
Alexander Weiß (2023) Performance investigations of mobile analyzers for ultrafine particles in field and laboratory as part of the UFP-MUC project

This study tests and evaluates the performance of three mobile particle counters for the observation of atmospheric ultrafine particles in field and laboratory experiments.

Supervisor: Anke Nölscher, Andreas Held
Julia David (2022) Ozone risk = Urban risk? Investigations of the non-linear tropospheric ozone production along an urban-rural gradient

Tropospheric ozone is one of the pressing problems related to air pollution worldwide and is non-linearly linked to NOx, ROx, and VOC concentrations in ambient air. This work aims to explore trends in surface ozone concentrations on a temporal and spatial scale. Therefore, datasets from urban, suburban and rural areas will be compared that are available from the Umweltbundesamt (UBA), Bayrisches Landesamt for Umwelt (LfU) and the Bayreuth Center of Ecology and Environmental Research (BayCEER) .

Supervisor: Anke Nölscher, Christoph Thomas
Kenny Rautenberg (2022) What is the link? Fingerprint analysis of Polycyclic Aromatic Hydrocarbons (PAHs) in soil and airborne particles

Polycyclic aromatic hydrocarbons (PAHs) are major organic pollutants which are ubiquitously spread around the globe and are primarily emitted via anthropogenic combustion processes. They have been found in various environmental media and most substances of this group exert a carcinogenic on living organisms including humans. PAHs make up a majority of the organic fraction in atmospheric particles, particularly in ultrafine particles (UFP) – particulate matter with a diameter of ≤ 100 nm. Due to their small size, UFP pose a risk for harmful effects on the human body and the earth’s environment. The aim of this master thesis is to implement and validate a method for the filter extraction and subsequent GC-MS analysis for ambient UFP samples focussing on PAHs.

Supervisor: Anke Nölscher, Eva Lehndorff
Sophia Kraft (2022) Effects of airborne PAH on the formation and composition of biogenic secondary organic aerosol

Supervisor: Anke Nölscher
Shubhi Arora (2021) Analysis of O3, NO and NO2 measured at characteristically varied locations in Bayreuth

Supervisor: Anke Nölscher, Christoph Thomas

PhD Theses
Julius Seidler Investigating origin and transport of ultrafine particles in the vicinities of a major German airport

Supervisor: Anke Nölscher
Elisabeth Eckenberger Optimization and application of novel methods to separate, collect and analyse ultrafine particles in air

Supervisor: Anke Nölscher
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