Rosie Archer

Department of Geography

PhD Candidate

PhD candidate Rosie Archer

Full contact details

Rosie Archer
Department of Geography
Geography and Planning Building
Winter Street
S3 7ND

My background is in Mathematics, specialising in Statistics. I am interested in applying statistics to real-world problems.

I am currently studying for my PhD within the PALGLAC project, working to create an optimal numerical model of the last Eurasian Ice Sheet using statistical techniques.

My other research interests include Bayesian statistics, machine learning and statistical distributions of landform morphology.

Emulating the Last Eurasian Ice Sheet

My project is looking at using statistical techniques, such as emulation, to improve approaches to modelling the last Eurasian Ice Sheet. Ice sheet models are computationally expensive, and produce large uncertainties. An emulator is a statistical representation of model simulations, which can be used to infer model behaviour for parameter combinations that have not been run through a model. This means that an emulator can help quantify uncertainties as well as reducing the computational power required. In my project, I will model the EIS using the Parallel Ice Sheet Model (PISM). Output from the model will be used to train a Gaussian Process emulator. The emulator will use model-data comparison techniques, to find how different parameter combinations alter the fit to palaeo data.

Current techniques of model-data comparison techniques are primitive in their statistical approach and rarely used. From the emulator, a Bayesian history matching approach will be used to further refine parameter values to use within the main ice sheet model. By improving the model-data comparison framework, my aim is to better utilise the record from palaeo-ice sheets to find optimal parameter combinations, which in turn may help improve ice sheet model formulations.

Supervisors: Dr Jeremy Ely, Dr Tim Heaton, Prof Chris Clark.


2017-2020: BSc Mathematics, The University of Sheffield

Teaching activities

ACS234 - Systems Engineering Mathematics II (Graduate Teaching Assistant, 2020-2021)
MAS113 - Introduction to Probability and Statistics (Graduate Teaching Assistant, 2020-2021)
MAS115 - Mathematical Investigation Skills (Graduate Teaching Assistant, 2020-2021)
MAS223 - Statistical Inference and Modelling (Graduate Teaching Assistant, 2020-2021)
MAS275 - Probability Modelling (Graduate Teaching Assistant, 2020-2021)

Professional activities

SIAM-IMA Sheffield Chapter Summer Postgraduate Poster Competition First Prize – July 2021
Institute of Mathematics and its Applications Prize for outstanding performance of a final year student - July 2020.

Institute of Mathematics and its Application, Associate Member.
Society for Industrial and Applied Mathematics, Student Member.