Jemma Jeffree is a PhD candidate in the Climate Fluid Physics group.  She uses novel methods to quantify the internal variability of the climate system, in both models and observations. Mostly, her projects involve reducing large datasets to extract and synthesise useful information. Her Honours work developed a method of processing GRACE satellite gravity data to measure Antarctic Bottom Water (AABW). In previous work, she has used a conceptual model to explore decadal variability in El Niño Southern Oscillation (ENSO) within a large ensemble reanalysis. Her PhD focuses on the predictability and decadal variability of ENSO complexity using large ensembles. In particular, she is currently investigating the impacts of different ocean regions on ENSO forecasts, and how this varies between climate models and lead times.