Project Overview: This PhD project at the University of Southampton's School of Ocean and Earth Sciences investigates the causes and impacts of the recent and dramatic decline in Antarctic sea-ice, with a particular focus on the record loss observed in 2023. The project aims to address major unresolved questions regarding the drivers of sea-ice reduction and its far-reaching consequences for the ocean and atmosphere, including potential critical climate transitions. Research Areas: The research will span climate science, marine sciences, meteorology, marine geography, data analysis, mathematical modelling, computational physics, and environmental physics. Students will have the opportunity to develop and apply advanced quantitative and computational skills to analyze large datasets and model complex climate and oceanic systems. Supervision and Environment: The project is supervised by a multidisciplinary team: Prof S Josey, Dr H Ayres, Prof R. M. Marsh, Dr A Meijers, and Dr S Tajouri. The University of Southampton is renowned for its research in ocean and earth sciences, providing access to state-of-the-art facilities and a vibrant academic community. Eligibility: Applicants should have or expect to obtain at least a UK 2:1 honours degree (or international equivalent) in a relevant field such as Earth Science, Environmental Science, Physics, Mathematics, Marine Science, or Meteorology. Experience in data analysis, mathematical or computational modelling, and a strong interest in climate science are highly desirable. Non-native English speakers must meet the university's language requirements. Funding: Funding details are not specified in the current advertisement. Prospective applicants are encouraged to check the project link or contact the supervisors for the latest information on funding availability. Application Process: Applications should be submitted online via the University of Southampton's postgraduate application portal by 8 January 2026. Prepare your CV, academic transcripts, and a personal statement outlining your research interests and suitability for the project. Informal inquiries to the supervisors are welcome. For more information and to apply, visit the project webpage .