The Group

Our group collaborates with colleagues across Exeter's Earth Systems Science and Geography disciplines, the Met Office Hadley Centre and the Centre for Environment, Fisheries and Aquaculture Science

Dr Paul Halloran (Group Leader)

Paul imagePaul’s primary research interests focus on understanding the role of the marine carbon cycle within the Earth system. His multi-disciplinary background allows this to be tacked in a novel way. Paul’s degree and PhD were in the Department of Earth Sciences in Oxford, where working with Ros Rickaby, he examined ENSO change over the Pliocene, developed novel geochemical climate proxy techniques, and investigated the impact of ocean acidification on calcifying phytoplankton. After his PhD Paul moved to the Met Office Hadley Centre as a scientist, then senior scientist in ocean biogeochemical modeling. In the Hadley Centre Paul was heavily involved in the development, validation and application of the Earth System Model HadGEM2-ES. Working with this model, Paul and colleagues investigated the mechanisms behind novel biogeochemical climate feedbacks, the role of anthropogenic aerosols in recent climate change, reversibility in the earth system and more. In 2013 Paul took up a lectureship in the School of Geography, University of Exeter, becoming a senior lecturer in 2016, where he is working to unite past and future climate research to help improve our understanding of the Earth system.

Sarah Holmes (PhD Student)

anon imageSarah has just accepted a NERC CASE (with Cefas) funded PhD studentship to work on an exciting project which will bring together annually resolved palaeoclimate reconstructions from bivalves with shelf-sea modelling. The project aims to deliver new understanding about the climate drivers of ecosystem change in the North West European shelf seas. Sarah's undergraduate dissertation project, based in Exeter, but working closely with colleagues in Bangor, produced a novel 99 year Glycymeris glycymeris chronology from the English Channel.

Freya Garry (PDRA)

MAtt imageFreya is working between Exeter and the Met Office on the NERC funded CLAM (Climate of the Last Millennium) project. Freya will be analysising CMIP5 simulations and  performing new HadGEM3 simulations to test hypotheses of the drivers of decadal and longer Atlantic surface circulation variability, and by doing so understand exciting new annually resolved seawater temperature and salinity resconstructions spanning the last millenium.

Jen McWhorter (PhD student)

MAtt imageJen is a PhD student with an Exeter-Queensland scholarship (supervised by Pete Mumby in Queensland) to work on downscaling global climate and biogeochemical model data to the costal ocean to drive novel coral reef projections.

George Manville (PhD Student)

MAtt imageWe have recently appointed a PhD student to work on Southern Ocean marine trace gasses and climate, joint with the Met Office.

Co-supervised Students:

Gen Hinde

MAtt imageGen is a NERC GW4+ funded PhD student working on a PhD led by Dr Marie-Jose Messias and the ocean tracers team. Her project will use transient tracers observations to investigate the uptake of heat and CO2 by the Southern Ocean.

Gen graduated with an MSci Oceanography from the University of Southampton in 2017 with a year spent abroad at the University of Washington, Seattle. Whilst in Seattle she took part in a student research cruise to Vancouver Island and collected data within Nootka Sound, a fjord system. She used this data to produce a thesis looking at the influence of coastal upwelling on the surface CO2 flux within the fjords. Once back in Southampton Gen completed her final year project looking at methods to detect subsurface meltwater outflows from Antarctic ice shelves.

Aimee Coggins

MAtt imageAimee is a Royal Society funded PhD student working on the Southern Ocean carbon cycle, lead supervisor Andy Watson.


Alice Lebehot (PhD Student)

Alice Lebehot (Lead supervison, Paul Halloran, co-supervisors, Andy Watson, Doug McNeall, Ute Schuster). Moved to Capetown to work with Pedro Monteiro. Alice worked on the RAGNARoCC project. Her work aims to understand how, and how well, Earth System models simulate observed North Atlantic pCO2 variability, to help constrain our confidence in model projections of future CO2 uptake. Numerous observational campaigns and data from ships of opportunity over the past two decades have lead to the suggestion that modes of climate variability (NAO and AMO) dominate recent N. Atlantic air-sea CO2 flux changes (Thomas et al, 2008, Watson et al, 2009). Links between air-sea CO2 flux and the NAO and AMO, if robust, are extremely valuable because they allow mechanisms for changing CO2 uptake, verified in the real world, to be considered in the context of past and future natural and anthropogenic forcing. As promising as these relationships may seem, the observational CO2 air-sea flux record spans less that one full cycle of the NAO‘s, and less than half a cycle of the AMO’s multi-decadal variability, and therefore our confidence in these relationships is very limited. We must therefore look to carefully validated models to extend our observational understanding and place observed changes in a future context. Alice also worked with us for 6 months on the NERC CURBCO2 project.

Lester Kwiatkowski
(Lead supervisor, Peter Cox). Moved to work as PDRA in Stanford with Ken Caldera and is now at IPSL working with Laurent Bopp in France.

Matthew Couldrey (Lead supervisor, Kevin Oliver, Southampton). Moved to work as PDRA with Jonathan Gregory in Reading.

Tobia Tudino. Tobia completed a 6 month contract with us after his PhD to work on the CurbCO2 project.