Wayne de Jager – Increased Rotational Coupling Between Antarctic Sea Ice and the Atmosphere Over the Last 30 Years
Sebastiaan Swart – The oceans imprint on air sea fluxes: Drivers of turbulent heat flux over the Agulhas Current
Tarron Lamont – Monitoring Western Boundary Current System variability with satellite altimetry
Riesna R. Audh – Rafting of Growing Antarctic Sea Ice Enhances In-Ice Biogeochemical Activity in Winter
Robyn Verrinder – Antarctic MIZ observation platforms: Interdisciplinary approaches to resolve seasonal sea ice variability
Tamaryn Morris – 1. Sustained ocean observations for the Agulhas Current: Realizing the Benefits of Ocean Knowledge through Co-Design. 2. Capturing a cyclonic eddy, and cross-shelf dynamics, in the Agulhas Bight during an early retroflection of the Agulhas Current.
Magata Mangatane – Intercomparison of Antarctic sea-ice thickness estimates from satellite altimetry and assessment over the 2019 data-rich year.
Sharon Nicholson – The seasonal cycle in Southern Hemisphere Africa
Rutger Marquart – Coupled dynamics and thermodynamics modelling of heterogeneous sea ice and ocean waves
Janine Schoombie – Mapping within-island-scale wind variation on Marion Island
Christopher Reason – Multiyear La Niña events, the Mozambique Channel, and rainfall over eastern Africa
Thulwaneng Mashifane – Trait–Based Adjustments: Key to Improving Bloom Seasonal Cycle in the Subantarctic Zone
Sandy Thomalla – VeGAS-pCO2: Versatile glider, atmospheric and ship high precision pCO2 gas flux analyser
Amber Sneddon – Atmospheric River climatology for the South Atlantic Basin based on modern image-processing-based tracking.
Marcel Du Plessis – Storms regulate Southern Ocean summer warming
Sandy Thomalla -Southern Ocean Observing System for sustained and coordinated observations in a changing world
Thomas Ryan-Keogh – How can we effectively manage the impact of climate change on Antarctic ecosystems?
Sandy Thomalla – Climate-driven change to phytoplankton blooms across the global ocean
Nicolette Chang – Investigating Heat and Carbon Exchange in the Southern Ocean: Insights from a Mesoscale-Resolving
Sarah Du Preez – Environmental influence on zooplankton variability around sub-Antarctic Prince Edward Islands
Sarah-Anne Nicholson – The impact of storms on CO2 and heat exchange across the Southern Ocean
Thato Mtshali – Wintertime distribution and mixed layer dissolved iron budget in the south Atlantic sector of the Southern Ocean
Miranda Sitofile – The seasonal iron supply in the Southern Ocean
Chris Reason – Interannual and intraseasonal variability in the Southern Hemisphere
The second session within the Marine and Antarctic Research Strategy research theme : Oceans and marine ecosystems under global change was chaired by Sandy Thomalla and Sarah Nicholson from Southern Ocean Carbon- Climate Observatory (SOCCO). The session title, “The Southern Ocean’s sensitivity to a changing climate: insights from a seasonal cycle approach” were presented through oral presentations and e-posters from SOCCO. (Left Sandy Thomalla, Right Sarah Nicholson, above SOCCO group photo)
Above (l-r): Tesha Toolsee, Tommy Ryan-Keogh, Thapelo Ramalepe, Thato Mtshali.
Sarah Nicholson: The impact of storms on CO2 and heat exchange across the Southern Ocean.
Tesha Toolsee: The complex role of storms in modulating intra-seasonal air-sea CO2 fluxes in the sub-Antarctic Southern Ocean.
Sandy Thomalla: Trends in Southern Ocean Phytoplankton bloom phenology.
Sifiso Mpapane: Understanding photo acclimation effects on Chl:C ratio in the Southern Ocean: modelling considerations and insights into seasonal assemblage composition. (E-poster)
Tommy Ryan-Keogh: Multi-decadal trend of increasing iron stress in the Southern Ocean phytoplankton.
Thapelo Ramalepe: Exploring the seasonal processes governing manganese supply in the Southern Ocean.
Thato Mtshali: Winter-time distributions and dissolved iron mixed layer budget in the south Atlantic sector of the Southern Ocean.
Miranda Sitofile: Investigating seasonal variability of dissolved iron in the South Atlantic sector of the Southern Ocean: Insights from the winter and spring SCALE 2019 cruises. (e-poster)
Lillina Ruiters: Variability of phytoplankton photo physiology in the Southern Ocean: an analysis of assumptions and uncertainties. (e-poster)
Above(l-r): Sifiso Mpapane, Miranda Sitofile, Lillina Ruiters
MARIS started the first session on Southern Ocean research within SANAP with focus on SEA ICE. Above: Rutger Marquart, Magata Mangatane, Dylan White, Anand Nair, Wayne de Jager, Leila Nefdt, Safiyyah Moos, Tokoloho Rampai, Marcello Vichi, Robyn Verrinder, Hayley Swait, Riesna Audh, James van Niekerk. (Photo Credit: MARIS)
The first ocean session covered the Antarctic sea ice research field led by the Sea Ice Team from the Marine and Antarctic Research for Innovation and Sustainability (MARiS). The research themes covered in this session were innovation and development, oceans and marine eco-systems under global change and earth systems observations. The presentations and posters under these research theme covered a diverse range of projects from large-scale sea ice observations, tracking and measurements to the small-scale sea ice dynamics, properties and biogeochemistry. Antarctic sea ice research has received a comparatively limited focus compared to its Arctic counterpart. The MARiS sea ice team is constituted of the departments of Oceanography, Electrical and Chemical Engineering at the University of Cape Town, with projects aimed to contribute new insights and push the boundaries within this research domain. The presentation within this session were on a variety of earth system observations models, simulations of sea ice wave interactions, innovative tool development for lab-based experiments and field-based work investigating sea ice dynamics and properties and the ecological impacts of algae and their biogeochemical significance. The session under the MARS theme; Oceans and marine ecosystems under global change was chaired by Principal investigator Tokoloho Rampai and it included an overview of Maris by Robyn Verrinder. The session was done in round table fashion and included posters and oral presentations. Tokoloho concluded the session with a closing statement
Oral presentations:
Robyn Verrinder – Overview of MARIS.
Rutger Marquart – Numerical modelling of sea ice dynamics and thermodynamics in the Antarctic marginal ice zone. (abstract)
Anand Nair – Three-Dimensional Computational Fluid Dynamics Modelling of Pancake Ice on Waves. (abstract)
Safiyyah Moos – Investigating the dynamics and exchanges across the ice-ocean interface in artificial sea ice. (abstract)
Hayley Swait – Investigating Brine and Air Porosity in Sea Ice from the Eastern Antarctic Marginal Ice Zone. (abstract)
Poster Presentations were displayed in the venue during the symposium and presenters gave a quick introduction to their posters during the round-table session.
Wayne De Jager – Sub-daily Antarctic sea-ice variability estimates using swath-based retrieval methods. (abstract)
Dylan White – Discussion on the Premise of, and Challenges in, the Development of a Ship-Based Radar System for the in-situ Measurement of Sea Ice Thickness. (abstract)
Marcello Vichi – Wind- and wave-driven free-drift dynamics in Antarctic Sea ice.(abstract)
Tokoloho Rampai – Sea ice growth dynamics and their influence on the physical, structural and mechanical properties-A discussion on innovation in in situ testing. (abstract)
James van Niekerk – Investigation of the Interactions Between Sea Ice Algae from the Marginal Ice Zone of Antarctica and Artificial Sea Ice. (abstract)
Riesna Audh – Winter biogeochemical activity is enhanced by rafting in growing Antarctic Sea ice. (abstract)
After the session the group took pictures (Credit: Leila Nefdt)
It is with great sadness that we announce the untimely passing of Dr Precious Thembumuzi Mahlalela.
Dr Mahlalela, Research Coordinator of the South African Polar Research Infrastructure (SAPRI) LTO-Ocean Integrated Facility, passed away on 28 November 2023 after a short battle with cancer.
Dr Mahlalela joined NRF-SAEON (host of SAPRI) in May 2023 at the same time as successfully finishing off the corrections for her PhD in Ocean and Atmospheric Sciences thesis, entitled Variability and Trends in Rainy Season Characteristics of the Eastern Cape. She was due to graduate in December.
Upon joining the SAPRI team, she threw herself straight into the adventure, assisting with SEAmester and providing great support at sea. As soon as she was back on dry land she flew to China to learn about moorings. Although this was her first international trip, she approached it like the other challenges she has faced, with a calm and humble attitude, open to learning and new experiences. Upon her return, she insisted on accompanying the SEAON team on a science engagement roadshow in the Western Cape to inspire young minds. She continued to work with the same positive energy and gentle sense of humour that endeared her to everyone.
“In the short time she was with us at SAPRI she became part of our family. Taken from us far too soon, her light will continue to shine through the friendships she made, the individuals she worked with, and the souls she ignited with inspiration. Fair winds and following seas, shipmate. We have the watch now” Prof Juliet Hermes – SAPRI and SAEON Egagasini Manager.
Dear Precious
Your warmth and gentle spirit shone so brightly that any room you walked into lit up with a soft glow. You were an angel on this earth who combined both a bubbly and calming presence and we will miss you more than any words can convey. We were so honoured to have worked with you.
Go gently dearest Precious. With love, from the SAPRI team.
The SAPRI team and SAEON Egagasini team will miss you dearly.
Our deepest condolences to Precious’s family, friends and everyone who had the privilege of meeting her.
Obituary of Precious Mahlalela by Juliet Hermes, Tammy Morris, Anne Treasure, Errol Julies, Anche Louw, Abu Nguna, Rabia Mathakutha and Riesna R. Audh, 30 November 2023.
Research team on the recent Gough Island takeover expedition.
Phytoplankton are microscopic plants that live in the ocean, and just like plants on land they need to have enough food to grow and be happy. However, some places in the ocean don’t have enough food for them whereas some places do. The Southern Ocean Carbon & Climate Observatory (SOCCO) team based at CSIR, Trace Metals team based at Stellenbosch University (TracEx) and the Department of Forestry, Fisheries and the Environment: Oceans and Coasts team are trying to figure out where those places are (in the Southern Ocean).
During the Gough Island takeover expedition:
The Trace Metal Biogeochemistry research teams sampled upstream and downstream of Gough Island to look at how the Antarctic Circumpolar Current (ACC) interacts with the island to resuspend sediments from the seafloor. This resuspended sediments acts as a source of trace metals to the surface mixed layer in support of phytoplankton blooms. The team used a 12 bottle mini-CTD rosette system (see image below, right) to sample for dissolved trace metals, particulate trace metals and organic trace metal chemistry.
TEAM
Trace Metal Biogeochemistry
Projects Name
Seasonal Iron speciation in the Southern Ocean, from open ocean environments to naturally fertilized sub-Antarctic Islands (Marion and Gough Island)
Principal Investigator
Dr Thomas Ryan-Keogh
Senior Researcher at the Southern Ocean Carbon-Climate Observatory (SOCCO), CSIR South Africa
Co-Principal Investigator (On board DFFE team leader)
Dr TN Mtshali
Department of Forestry, Fisheries and the Environment (DFFE)
Including all ship-based scientists sampling for trace metals
The project in more detail:
The Southern Ocean (SO) is one of the largest high-nutrient low-chlorophyll regions in the World’s Ocean, where primary productivity is limited by iron bioavailability, thereby impacting the strength and efficiency of biological carbon pump. There are, however, exceptions with large phytoplankton blooms persistently observed downstream of the sub-Antarctic Islands. While extensive research has focussed on iron-biogeochemistry around Kerguelen and Crozet islands, no such studies have been conducted at Marion and Gough islands.
Furthermore, whilst our previous studies have made substantial advances toward addressing the gaps in seasonal data coverage through the Southern oCean seAsonaL Experiment (SCALE) 2019 winter and spring expeditions, there is still a paucity of dissolved iron data in the SO, especially from autumn to late spring. This is severely hampering our understanding of the full seasonal biogeochemical iron cycle and its impact on primary production. This project aims to continue its focus on seasonality by expanding seasonal coverage of iron measurements to include autumn (Marion) and late-spring (Gough) expeditions for more comprehensive coverage of the SO seasonal cycle, with a particular focus on quantifying biogeochemical cycling of iron-pool around these understudied islands.
This project is funded by: The National Research Foundation, South African National Antarctic Programme funding (NRF-SANAP).
June 2023 saw the success of the 6th SEAmester expedition, a programme aimed at accelerating marine science as an applied and cross-disciplinary field to postgraduate students all over South Africa. Forty-seven science students from institutions across the country made it through the programme and participated in the SEAmester ten-day at-sea practical training course aboard the flagship South African research vessel, S.A. Agulhas II. The programme was led by Prof. Isabelle Ansorge, head of the Department for Oceanography at the University of Cape Town (UCT) and initiator of the programme; and coordinated by Tahlia Henry.
SEAmester is a programme initiated to meet the Department of Science and Innovation (DSI) objectives of creating platforms to “attract young researchers to the region and retain them by exciting their interest in aspects of global change”. SEAmester introduces marine science as an applied and cross-disciplinary field to students. The strength of SEAmester is that postgraduate students combine theoretical classroom learning with the application of this knowledge through ship-based and hands-on research.
SEAmester was undertaken in collaboration with ASCA, a science project spearheaded by DSI and the South African Environmental Observation Network (SAEON), Egagasini Node. ASCA is a multi-institutional, international collaboration, whose objectives are to determine how the Agulhas Current and its role in the global conveyor belt varies over time by providing the first long-term observations of Agulhas Current volume, heat and salt transport and its variability through seasonal to interannual timescales. To read more about ASCA click here.
Since ASCA provides a large, international programme performing ground-breaking science, and is also being used as a training platform for students, interns and junior staff, teaming SEAmester with ASCA makes an excellent match, one that has worked successfully for all SEAmester expeditions to date.
Students taking photos and soaking in the views as they bid farewell to Cape Town en route to the expedition.
Setting sail
The S.A .Agulhas II voyaged from East Pier, Cape Town on 20 June 2023 to the Agulhas Current, off East London, and docked back in Cape Town on 29 June 2023. The expedition involves running a transect across the core of the Agulhas Current off Port St Johns. The SEAmester VI expedition encompassed a group of forty-three postgraduate students from various Higher Education Institutions (HEIs) across the country (both inland and along the coast), including, two high school learners from the Northwest School, and two junior scientists from Anchor Environmental Consultants, as part of expending its network and reach.
The first two days of the voyage en route to the ASCA transect gave all on board a chance to settle in and combat their seasickness. Among the bird, mammal and weather observations along the way, the students managed to get further acquainted with life at sea.
SEAmester VI Activities
The students were divided into two module steams, “Tools of the Trade” and “Oceans in a Changing Climate”. Oceans in a Changing Climate focuses on the biological aspect of the ocean, the role of the ocean as a carbon source and carbon sink, the interconnectivity of the ocean with the atmosphere and how it affects life in the sea. Tools of the Trade focuses on various methods of measuring the physical properties of the ocean, using an assortment of instrumentation each comprising highly expensive sensors.
Learning comprised of daily class-room lectures, daily assignments and deck work – running in parallel to the ASCA programme. Students from both streams provided research support to specialist scientists and obtained daily hands-on deck training, data collection, sampling and data analysis. Each student gained experience working with the full suite of oceanographic, atmospheric and biological ship-based instrumentation such as CTD, underway measurements and autonomous devices such as Argo, SVP drifters, as well as experience on biological net tows. Training on data analysis following each dedicated SEAmester CTD station was provided, as well as technical and electronic experience in calibrating and modifying each instrument. In addition, a third stream is offered to all students which is the “Art” stream, this allows students to be creative in tasks such as tiled mosaics, photography, and documenting their cruise through journals and film-making. The students also had to work on a specific scientific mini-project related to their area of interest and the scientific research underway.
The spectrum of lectures included Introduction to Physical Oceanography, Microbiology and DNA, Benthic Environment, Oxygen and Nutrients, Molluscs, Seals and Dissections, Micro-plastics, Blue Economy, Oil spills, Maritime Archaeology, Hydrography, GIS Mapping, Film, Photography, Astronomy, Engineering, Acoustics, and Phytoplankton; presented by highly skilled lecturers and professionals from South Africa’s HEIs and organisations alike.
SEAmester VI Takeaways
The jam-packed SEAmester and ASCA operations ran smoothly with no issues to report for the entire expedition. The students were dedicated and rose to the challenge and completed their projects timeously. The programme came to an end on the morning of the 29th of June after the students showcased their SEAmester movies about their journey and received their completion of the programme certificates. The students were then treated to a cake by the SA Agulhas II crew. An art exhibition and farewell gathering was held the night before, where students reflected on their journey and the expedition, expressing that SEAmester has been rewarding both educationally and in terms of the network and connections they made. A social braai and themed party were held on one of the last nights, during this time, all the students and staff came together to unwind after all the tasks had been submitted.
With that said, the biggest success of SEAmester remains to be its ability to break down social, cultural, economical, and racial barriers between students and in doing so build the next generation of integrated marine scientists in South Africa.
Wayne de Jager – Increased Rotational Coupling Between Antarctic Sea Ice and the Atmosphere Over the Last 30 Years
The second session within the 
Above (l-r): Tesha Toolsee, Tommy Ryan-Keogh, Thapelo Ramalepe, Thato Mtshali.
Above(l-r): Sifiso Mpapane, Miranda Sitofile, Lillina Ruiters
MARIS started the first session on Southern Ocean research within SANAP with focus on SEA ICE. Above: Rutger Marquart, Magata Mangatane, Dylan White, Anand Nair, Wayne de Jager, Leila Nefdt, Safiyyah Moos, Tokoloho Rampai, Marcello Vichi, Robyn Verrinder, Hayley Swait, Riesna Audh, James van Niekerk. (Photo Credit: MARIS)
Oral presentations:
Poster Presentations were displayed in the venue during the symposium and presenters gave a quick introduction to their posters during the round-table session.
