Dr Natasha Wallum

BSc MSc S'ton, DPhil Oxf

Departmental Lecturer

I completed my BSc (Hons) in Physical Geography and MSc in Applied GIS and Remote Sensing at the University of Southampton, where my undergraduate dissertation received national awards from the Royal Geographical Society (with IBG) and the British Society for Geomorphology. After working as a corporate geospatial analyst in London, I returned to academia to undertake a DPhil in Environmental Research at the University of Oxford, funded by the UKRI Natural Environment Research Council (NERC) Doctoral Training Programme and Hertford College. My doctoral research explored the geomorphological and geochemical controls on dust emission from Etosha Pan in Namibia, a major dust source in the Southern Hemisphere. My current role at the University of Oxford combines research and teaching in Physical Geography, with a particular focus on geomorphology, Earth system science, and data-driven approaches to studying environmental change.

I am a Tutor in Physical Geography at Brasenose College, where I teach undergraduates reading Geography across Prelims (first year) and the Final Honours School (second and third years). I teach Prelims papers in Geographical Techniques, Earth Surface Processes, and Geographical Controversies, and Final Honours School papers in Earth System Dynamics, Geographical Thought, and Environmental Geography.

As a College Tutor in Geography at Brasenose, I teach and supervise undergraduates across both the Preliminary Examinations (Prelims) and the Final Honours School (FHS). At the Prelims level, I teach the core papers in Geographical Techniques, Earth Surface Processes, and Geographical Controversies, supporting students in developing analytical, quantitative, and conceptual skills that form the foundation of Physical Geography. In the Final Honours School, I teach and tutor in Earth System Dynamics, Geographical Thought, and Environmental Geography, as well as across the broader Physical Geography curriculum. I also supervise and advise undergraduate, MSc, and DPhil research projects in geomorphology, environmental change, dust emission processes, and Earth observation.

Within the School of Geography and the Environment, I convene and lecture core Prelims papers on Geographical Techniques, Earth Surface Processes, and Geographical Controversies, the FHS paper on Earth System Dynamics, and convene the optional FHS paper Desert Landscapes and Dynamics. My departmental teaching spans geomorphology, Earth system science, and geospatial analysis, with a focus on integrating fieldwork, GIS, and remote sensing in the study of environmental processes and change. I lead and support undergraduate field teaching in both coastal and dryland environments, including field trips to Portland (Prelims) and Tenerife (FHS), and contribute to postgraduate training within Physical Geography and the environmental sciences.

My approach to teaching combines field-based and analytical perspectives to help students link the physical processes shaping Earth’s surface with the wider environmental systems that drive change.

My research interests and experience encompass aspects of aeolian geomorphology and are primarily focused on the global dust cycle, with emphasis on the investigation of the geomorphological and hydrological processes that modulate the emission of atmospheric mineral dust from large ephemeral lake bed sources in dryland regions.

I combine satellite remote sensing, field investigation, and laboratory-based sediment analysis to understand how variations in surface composition, morphology, and hydrology control the timing and intensity of dust emissions. Much of my current work focuses on southern Africa, where I use field and spaceborne imaging spectroscopy to examine the surface mineralogy and geochemistry of major ephemeral lake systems such as Etosha Pan in Namibia. This research contributes to improving the representation of dust source processes in global climate and atmospheric models, with broader implications for climate feedbacks, air quality, and ecosystem dynamics.

https://www.geog.ox.ac.uk/news/decoding-dust-storms-namibias-etosha-pan-reveals-global-climate-connections

A full list of research publications is available here: https://scholar.google.com/citations?user=bjyEYPIAAAAJ&hl=en

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