People

Current Team
Sebastiaan Swart – Associate Professor

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Seb’s research interests are focused on understanding the circulation and dynamics in the open ocean, particularly in the Southern Ocean. As a Wallenberg Academy Fellow at the University of Gothenburg, Sweden, he is investigating the main physical processes of the upper ocean and how these impact both regional and global climate. He employs remotely sensed satellite data and in situ observations from gliders, ships and profiling floats in remote & harsh ocean environments to test novel hypotheses related to submesoscale features, upper ocean stratification and mixed layer processes. He was previously head of a national facility called the South African Marine Engineering & Robotics Centre between 2013-2016. This position spurred my activities in pioneering cutting-edge technology, namely gliders, to obtain high-resolution ocean observations that continue to this day. He is currently Co-Chair of the international Southern Ocean Observing System (SOOS).

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Louise Biddle – Post Doctoral Fellow

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Louise is a postdoctoral researcher in the research group at the University of Gothenburg. She is interested in understanding how freshwater fluxes can affect the upper ocean through mixing or stratification on submesoscales, using a combination of observations and simple ocean process models. Her research at the moment focuses on the marginal ice zone around the Greenwich Meridian, using seal data to extract valuable measurements of temperature and salinity from under the sea ice during winter. Louise also has experience using Seagliders to collect ocean observations: during ship-board operations, piloting and later analysis of the data. She is passionate about developing our current abilities for under ice observations (whether that’s glacial or sea ice)!

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Marcel du Plessis – PhD student
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Marcel is a Ph.D. student at the University of Cape Town, working closely with the CSIR and University of Gothenburg. He has a particular interest in combining ocean observations and modeling to understand how lower atmospheric processes such as direct ocean heating/cooling and storms affect the surface ocean, eddies, currents, and mixing at the sub-mesoscales.

As one of the direct impacts of air-sea interactions at the sub-mesoscale is to change the upper ocean stratification, by either mixing or restratification, he is looking at multiple years of ocean glider datasets to elucidate what drives yearly differences in stratification. Data from profiling floats, shipboard measurements, and satellite observations are used to complement this analysis. These provide information on the lower atmosphere, sea surface and ocean interior, which contains the link between coupled ocean and atmospheric exchanges. Numerical modeling of these processes is done using the PWP 1-D and NEMO 3-D models.

Martin Mohrmann – PhD student

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Martin is a PhD student at the University of Gothenburg under supervision of Seb Swart, Céline Heuzé and Helle Ploug. His main interests are upwelling processes in the ocean. Currently, he is researching the physical and biogeochemical processes and responses in the Weddell Sea Polynya.

He discovered his passion for geosciences with his Bachelor thesis about LIDAR measurements in the upper atmosphere. Specialising in oceanography and climate physics in his master studies at the University of Rostock, Martins master thesis is about the analytical modeling of upwelling systems and the response of the ecosystem. In his free time, he is either conquering the Swedish archipelago by kayak, or tinkering around with some software projects.

Isabelle Giddy – PhD student

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Isabelle is an explorer of the natural world, with an unquenchable thirst for learning – from earth system science to anthropology. She has worked in education and marine conservation, speaks five languages, and is a co-founder of LIMPET South Africa, a rocky shore youth citizen science program. Isabelle is currently doing a PhD, under the supervision of Sebastiaan Swart at the University of Gothenberg, Sweden and the co-supervision of Sarah Nicholson and Isabelle Ansorge at the CSIR and the University of Cape Town, respectively. Her work is focused on understanding submesoscale processes in the Marginal Ice Zone of the Southern Ocean.

Kevin Thielen– PhD student / Fullbright Scholar

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Kevin is a DPhil student at the University of Oxford under Dr. Andrew Wells. He is currently a Fullbright Scholar at the University of Gothenburg. Kevin’s research interests focus on the fluxes of heat and momentum at the interface between frozen sea-ice and the ocean beneath it. Most of his work to date involves performing direct numerical simulations rough sea-ice and investigating the impact of these dynamics on larger scale ocean dynamics such as sub-mesoscale eddy formation and the structure of the Beaufort Gyre in the Arctic Ocean.

Jethan D’Hotman – Masters student

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Jethan is currently a masters student at Nelson Mandela University and is hosted by SAEON Egagasini node. His project is project is investigating shelf water variability inshore of the Agulhas Current. Data for Jethan’s project was collected from during the GINA experiment, which was the first ever deployment of a Wave Glider in the Agulhas Current. Jethan also provides technical support to ASCA, which is the first long term observational program in the Agulhas Current.

Collaborators

Isabelle Ansorge, University of Cape Town, South Africa

Alex Brearly, British Antarctic Survey, UK

Karen Heywood, UEA, UK

Celine Hueze, University of Gothenburg, Sweden

Marjolaine Krug, CSIR, South Africa

Craig Lee, University of Washington, USA

Amala Mahadevan, WHOI-MIT, USA

Mike Meredith, British Antarctic Survey, UK

Pedro Monteiro, CSIR, South Africa

Sarah Nicholson, CSIR, South Africa

Sabrina Speich, Ecole Normal, France

Sandy Thomalla, CSIR, South Africa

Andrew F. Thompson, CalTech, USA

Anna Wahlin, University of Gothenburg, Sweden

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