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Forensic oceanography: how does winter leave a fingerprint in the ocean? (STEVENSUMTH21ARIES)

School of Mathematics

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Prof D Stevens , Prof K Heywood No more applications being accepted Competition Funded PhD Project (Students Worldwide)

About the Project

Scientific Background
The Southern Ocean is a critical component of the global climate system, accounting for about 75% of ocean heat uptake and 40% of ocean anthropogenic carbon uptake. Winter Water, the remnant of the previous winter’s mixed layer, represents a snapshot of previous winter’s interaction between ocean, ice and atmosphere. Despite its importance, processes responsible for Winter Water formation are not thought to be well represented in current Earth System Models. The aim of this project is to assess Winter Water and its variability, in both newly-available Southern Ocean observational data sets and the UK’s climate models, determine the underlying physical mechanisms, and test Winter Water layer depth as a metric to assess Earth System Model performance.

Research Methodology
You will join a productive research team of climate modellers and physical oceanographers at UEA and the Met Office in Exeter (CASE partner). You will analyse Winter Water temperature, salinity and depth in observations from tagged seals, research ships and Argo floats. You will assess the performance of the UK’s climate models at different resolutions and with different mixing parameterizations in simulating Winter Water and its variability. You will use simplified models to investigate the key physical processes responsible for Winter Water formation, e.g. air-sea interaction, sea ice formation/melting and eddy subduction. You will test the hypothesis that Winter Water depth is a more robust indicator than mixed layer depth of Earth System Model performance.

This project will provide you with a thorough training in data analysis, numerical modelling, ocean dynamics and air-sea interactions. Researchers at UEA regularly lead and take part in field campaigns and we anticipate that you will participate in a Southern Ocean research cruise to gain oceanographic observational expertise. There will also be opportunities for you to attend summer schools.

Person Specification
We seek an enthusiastic candidate with strong scientific interests and self-motivation. They will have a degree in physics, mathematics, oceanography, meteorology, or climate science with good numerical skills.

For more information on the supervisor for this project, please go here

This is a PhD programme.

The start date is 1st October 2021.

The mode of study is full or part time (visa restrictions may apply).

The studentship length is 3.5 years.

Funding Notes

This project has been shortlisted for funding by the ARIES NERC DTP.

Successful candidates who meet UKRI’s eligibility criteria are awarded a NERC studentship covering fees, stipend (£15,285 p.a., 2020-21) and research funding. International applicants (EU/non-EU) are eligible for fully-funded studentships. Please note ARIES funding does not cover visa costs (including immigration health surcharge) or other additional costs associated with relocation to the UK.

Excellent applicants from quantitative disciplines with limited experience in environmental sciences may be considered for an additional 3-month stipend to take advanced-level courses.

ARIES is committed to equality, diversity, widening participation and inclusion in all areas of its operation. We encourage enquiries and applications from all sections of the community regardless of gender, ethnicity, disability, age, sexual orientation and transgender status. Academic qualifications are considered alongside significant relevant non-academic experience.

For further information, please visit

Funding Notes

Entry Requirements

Acceptable first degree in Physics, Mathematics, Oceanography, Meteorology or Climate Science.


1. Heuzé, C., K.J. Heywood, D.P. Stevens, and J.K. Ridley (2013) Southern Ocean bottom water characteristics in CMIP5 models, Geophysical Research Letters, 40, 1409-1414.
2. Heuzé, C., K.J. Heywood, D.P. Stevens and J.K. Ridley (2015) Changes in global ocean bottom properties and volume transports in CMIP5 models under climate change scenarios, Journal of Climate, 28, 2917-2944.
3. Hyder, P. et al (2018) Critical Southern Ocean climate model biases traced to atmospheric model cloud errors. Nature Communications, 9, 3625.
4. Mallett, H.K.W., L. Boehme, M. Fedak, K.J. Heywood, D.P. Stevens, and F. Roquet (2018) Variation in the distribution and properties of Circumpolar Deep Water in the eastern Amundsen Sea, on seasonal timescales, using seal-borne tags, Geophysical Research Letters, 45, 4982-4990.
5. Munday, D.R., and X. Zhai (2017) The impact of atmospheric storminess on the sensitivity of Southern Ocean circulation to wind stress changes, Ocean Modelling, 115, 14-26.
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