Leila Lazemi successfully defended her dissertation entitled "Spatio-temporal variation of particle number concentrations and size distributions across Germany using statistical analysis and modelling" on 11 October 2022. The thesis was supervised by Stephan Weber at the IGÖ.
On 20.05.2022 Agnes Straaten successfully defended her dissertation thesis entitled "Size-resolved particle number flux measurements in the urban boundary layer". Agnes collected a multi-year dataset of size-classified particle fluxes in Berlin using the micrometeorological eddy covariance method and evaluated it with respect to different research questions (e.g., anual variability, particle sources and sinks in the study area, influence of the COVID-19 lockdown on particle fluxes). The work was supervised at the IGÖ by Stephan Weber.
On Feb. 17, 2022, Sara Zaferani successfully defended her dissertation thesis entitled "Role of primary production for sequestration of natural and anthropogenic mercury in ocean sediments". The doctoral advisor is Prof. Harald Biester from the Environmental Geochemistry group.
Deep Joshi has successfully defended his dissertation "Characterization of Soil Hydraulic Properties for Modeling the Soil Water Dynamics at Different Spatiotemoral Scales". The content of his dissertation was to investigate the role of different parameterizations of soil hydraulic properties in describing soil water dynamics at different spatial and temporal scales. The doctoral supervisor is Prof. Wolfgang Durner from the Department of Soil Science and Soil Physics.
The content of this PhD thesis was the investigation of the effective hydraulic properties of stony soils from three perspectives: (i) experimental measurements, (ii) 3D numerical simulations and (iii) analytical methods. His doctoral supervisor is Prof. Wolfgang Durner.
On 28.01.2022 Lars Gerling successfully defended his dissertation entitled "Evaluation of microscale variation of urban ultrafine particle number concentrations and size distributions using a sectional aerosol model and statistical modelling approaches". The thesis was supervised at the IGÖ by Stephan Weber. Thanks also go to the external reviewer Prof. Dr. Tareq Hussein (University of Jordan, University of Helsinki).
Fabian Kalks successfully defended his dissertation on the topic "Dynamics of organic carbon in subsoils" on 20.07.2021. The thesis was prepared at the Institute for Agricultural Climate Protection of the Thünen Institute and supervised by Prof. Dr. Rolf Nieder from the Department of Soil Science and Soil Physics.
On 6 October 2020, Laura Grunwald successfully defended her dissertation within the framework of the disputation. Her dissertation "Urban cold-air paths - Properties and identification by modelling and geospatial analysis" dealt, among other things, with the development of methods for identifying urban cold-air paths by combining a two-dimensional, mathematical-physical cold-air runoff model (KLAM_21) and further analyses with the help of a geoinformation system. Furthermore, a machine learning method for the prediction of cold air pathways in a city was developed.
Diana Goertzen successfully defended her dissertation entitled "Diversity patterns of Central European Odonata in urban environments - a multi-scale perspective" on 20 August 2020. She dealt with the question of whether and under what circumstances dragonflies can achieve high species numbers in urban habitats and makes suggestions on how biodiversity in cities can be promoted in practice. Among other things, she was able to prove that the diversity of dragonflies in cities can be higher than in agricultural landscapes. The work was part of the DBU project Management of water bodies to promote biodiversity - a contribution to the implementation of the biodiversity strategy in cities and took place under the direction of apl. Prof. Dr. Frank Suhling.
Antonio J. Pérez Sánchez successfully defended his PhD thesis on "Response of ant assemblages to changing management practices in permanent grasslands of Central Germany" on 17 August 2020. The aim of his work was to understand the relationship between land use, environmental factors and ant communities (composition, species number and structure) on permanent grasslands in Central Germany in order to improve future conservation measures. His dissertation shows that the influence of grassland use on ants cannot be determined independently of local site characteristics (e.g. temperature and humidity). Thus, both local conditions and the regional context must be taken into account when investigating the relationship between ant communities and management in European grasslands. The work was carried out at the Thünen Institute for Biodiversity under the direction of Prof. Dr. Jens Dauber and in cooperation with the Department of Landscape Ecology & Environmental Systems Analysis. The work was funded by a research grant from the German Academic Exchange Service (DAAD). Congratulations!
Carluvy Baptista-Salazar, Lic., in Chemistry, successfully defended her dissertation on "Biogeochemical cycling of mercury in contaminated forested systems: Species, isotope ratios and fluxes" on 6 December 2018. The thesis was written under the supervision of Prof. Dr. Harald Biester as part of the project "The Role of Fluid Exchange in Earth and Environmental Systems", which was funded by the state of Lower Saxony as a sub-project of the GEOFluxes graduate school. Her dissertation shows that studies focusing on the transport dynamics of particulate Hg and Hg species can contribute to a better understanding of Hg cycles and transformations in the vicinity of former Hg mining sites. The combination of stable Hg isotopes with Hg solid phase speciation provided new insights into potentially different Hg isotope compositions associated with Hg species transformation processes, rather than relying solely on Hg fingerprint-based contamination source localisation. Congratulations!
Cora Vos successfully defended her dissertation on "Spatial variability and driving factors for soil organic carbon stocks, quality and saturation in agricultural soils of Germany" on 29 November 2018. She focused on the main driving factors for spatial variability as well as questions of the stability of different C fractions and the C storage potential of soils. She used extensive analysis results from the current soil condition survey for agriculture as a data basis. The work was carried out at the Thünen Institute for Agricultural Climate Protection under the supervision of PD Dr. Axel Don. At the TU Braunschweig, the work was supervised by Prof. Dr. Rolf Nieder. Congratulations!
Anne-Kathrin Schneider, graduate geoecologist, successfully defended her dissertation on "Spatiotemporal distribution patterns of earthworms and their role in soil hydrological functioning" on 3 July 2018. As part of the DFG research group "Catchments as Organised Systems (CAOS)" (FOR 1598), she created distribution models for earthworms for a mesoscale catchment in Luxembourg and investigated and quantified the relationships between earthworm activity and the occurrence of macropore flow in the field. The work was started at the TU Munich under the supervision of Prof. Dr. Boris Schröder-Esselbach and finished here with the transfer to the TU Braunschweig. Congratulations!
Susan Marina Britz, graduate geoecologist, successfully defended her dissertation on "Europium sorption experiments with muscovite, orthoclase, and quartz: Modelling of surface complexation and reactive transport" on 6 April 2018. The thesis was written at the Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) in the Site Selection Department (Repository Division) under the supervision of Dr Nosek as part of the "WEIMAR" project (further development of the smart-Kd concept for long-term safety analyses). At the TU Brauschweig, she was supervised by her doctoral supervisor Prof. Dr. Wolfgang Durner and Dr. Sascha C. Iden. Ms Britz continues to work at GRS as a postdoctoral researcher. Congratulations!