I am a researcher at the School of Earth and Environment, University of Leeds.
- Tropical cyclones
- The Indian summer monsoon
- Air-sea interactions
- Weather model simulations
- Volcanic ash dispersion modelling
Current research projects
Coupled Air-Sea Prediction of Extreme Rainfall (CASPER), WCSSP India. (PDRA, University of Leeds.)
- Extreme weather events in India impact the livelihoods of its over 1 billion inhabitants. Extreme weather events are often linked to monsoon depressions and tropical cyclones; successful prediction of the evolution of these events would improve the ability of emergency planners to respond effectively. We are evaluating the ability of a high-resolution air-sea coupled model to forecast the evolution of monsoon depressions and tropical cyclones in the Bay of Bengal, and analysing the structure of these systems as they make landfall over India. In collaboration with partners at the Met Office, the University of Reading, National Centre for Atmospheric Science (NCAS), Centre for Ecology and Hydrology (CEH), and in India.
Past research projects
From needles to plates: extreme volcanic ash shapes and implications for dispersion modelling (PhD project, NERC CASE studentship: University of Bristol / Met Office UK).
- Volcanic ash is hazardous to aircraft and can remain in the atmosphere for days or longer after an eruption. The rate of removal depends on meteorology and particle terminal fall velocity, which is sensitive to particle shape. However, most operational forecasters use a spherical particle approximation. I determined the shape range of volcanic ash, assessed the accuracy of drag laws for non-spheres using analogue particle settling experiments, and investigated the sensitivity of an atmospheric dispersion model (NAME; Met Office, UK) to the physical characteristics of the particles. I used the results of these experiments to make recommendations (default shape and drag law) on parameterising shape in operational dispersion modelling systems. In collaboration with the Met Office, UK.
The subsurface structure of Ilopango caldera, El Salvador (Master's project, University of Bristol).
- The Ilopango caldera in El Salvador has a long history of violent silicic eruptions, but little is known about its subsurface structure; a greater understanding would aid in predicting future eruption triggers. We created a Bouguer anomaly map of the caldera and surroundings using 106 new gravity benchmarks, revealing a significant subsurface density low. The depth of the modelled anomaly is consistent with a remnant magma body being present under Ilopango. Analysis of regional tectonic structures confirms a strong relationship between the complex transtensional tectonics of the El Salvador Fault Zone and magmatism at Ilopango. Fieldwork was carried out in collaboration with Ministerio de Medio Ambiente y Recursos Naturales (MARN), El Salvador.