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Browsing Research Publications/Outputs by Impact Area "Ocean Systems and Climate"

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Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone

Author: Singh, Asmita ; Fietz, S ; Thomalla, Sandy J ; Sanchez, N ; Ardelan, MV ; Moreau, S ; Kauko, HM ; Fransson, A ; Chierici, M ; Ryan-Keogh, Thomas J Date: Jul 2023 The high nutrient–low chlorophyll condition of the Southern Ocean is generally thought to be caused by the low bioavailability of micronutrients, particularly iron, which plays an integral role in phytoplankton photosynthesis. Nevertheless, ... Read more
Atmospheric rivers contribute to summer surface buoyancy forcing in the atlantic sector of the southern ocean

Author: Edholm, JM ; Swart, S ; Plessis, Marcel D ; Nicholson, Sarah-Anne Date: Aug 2022 Atmospheric rivers (ARs) dominate moisture transport globally; however, it is unknown what impact ARs have on surface ocean buoyancy. This study explores the surface buoyancy gained by ARs using high-resolution surface observations from a ... Read more
Bacteria and archaea regulate particulate organic matter export in suspended and sinking marine particle fractions

Author: Dithugoe, Choaro D ; Bezuidt, OKI ; Cavan, EL ; Froneman, WP ; Thomalla, Sandy J ; Makhalanyane, TP Date: Apr 2023 The biological carbon pump (BCP) in the Southern Ocean is driven by phytoplankton productivity and is a significant organic matter sink. However, the role of particle-attached (PA) and free-living (FL) prokaryotes (bacteria and archaea) and ... Read more
A circum-antarctic plankton isoscape: Carbon export potential across the summertime Southern Ocean

Author: Stirnimann, J ; Bornman, TG ; Forrer, HJ ; Mirkin, J ; Ryan-Keogh, Thomas J ; Flynn, RF ; Dorrington, RA ; Verheye, HM ; Fawcett, SE Date: Jan 2024 The Southern Ocean accounts for 30% of the ocean's CO2 sink, partly due to its biological pump that transfers surface-produced organic carbon to deeper waters. To estimate large-scale Southern Ocean carbon export potential and characterize ... Read more
Climate-driven variability of the Southern Ocean CO2 sink

Author: Mayot, N ; Le Quéré, C ; Rödenbeck, C ; Bernardello, R ; Bopp, L ; Djeutchouang, LM ; Gehlen, M ; Gruber, N ; Hauck, J ; Iida, Y Date: Jun 2023 The Southern Ocean is a major sink of atmospheric CO2, but the nature and magnitude of its variability remains uncertain and debated. Estimates based on observations suggest substantial variability that is not reproduced by process-based ocean ... Read more
The daily-resolved Southern Ocean mixed layer: Regional contrasts assessed using glider observations

Author: Du Plessis, MD ; Swart, S ; Biddle, LC ; Giddy, IS ; Monteiro, Pedro M ; Reason, CJC ; Thompson, AF ; Nicholson, Sarah-Anne Date: Apr 2022 Water mass transformation in the Southern Ocean is vital for driving the large-scale overturning circulation, which transports heat from the surface to the ocean interior. Using profiling gliders, this study investigates the role of summertime ... Read more
Deriving a proxy for iron limitation from chlorophyll fluorescence on buoyancy gliders

Author: Ryan-Keogh, Thomas J ; Thomalla, Sandy J Date: May 2020 Chlorophyll fluorescence, primarily used to derive phytoplankton biomass, has long been an underutilized source of information on phytoplankton physiology. Diel fluctuations in chlorophyll fluorescence are affected by both photosynthetic ... Read more
Developing an Observing Air-Sea Interactions Strategy (OASIS) for the global ocean

Author: Cronin, MF ; Swart, S ; Marandino, CA ; Anderson, C ; Browne, P ; Chen, S ; Joubert, WR ; Schuster, U ; Venkatesan, R ; Nicholson, Sarah-Anne Date: Sep 2022 The Observing Air–Sea Interactions Strategy (OASIS) is a new United Nations Decade of Ocean Science for Sustainable Development programme working to develop a practical, integrated approach for observing air–sea interactions globally for ... Read more
Global Carbon Budget 2021

Author: Friedlingstein, P ; Jones, MW ; O’Sullivan, M ; Andrew, RM ; Bakker, DCE ; Hauck, J ; Le Quéré, C ; Peters, GP ; Peters, W ; Djeutchouang, Laique M Date: Apr 2022 Accurate assessment of anthropogenic carbon dioxide (CO2) emissions and their redistribution among the atmosphere, ocean, and terrestrial biosphere in a changing climate is critical to better understand the global carbon cycle, support the ... Read more
High latitude Southern Ocean phytoplankton have distinctive bio-optical properties

Author: Robinson, CM ; Huot, Y ; Schuback, N ; Ryan-Keogh, Thomas J ; Thomalla, Sandy J ; Antoine, D Date: Jul 2021 Studying the biogeochemistry of the Southern Ocean using remote sensing relies on accurate interpretation of ocean colour through bio-optical and biogeochemical relationships between quantities and properties of interest. During the Antarctic ... Read more
The IPCC assessment report six working group 1 report and southern Africa: Reasons to take action

Author: Engelbrecht, FA ; Monteiro, Pedro MS Date: Nov 2021 The release of the Intergovernmental Panel on Climate Change (IPCC) Assessment Report Six (AR6) Working Group I (WG1) report in August 2021 brought to completion what is arguably the most thorough and scrutinised assessment of climate knowledge ... Read more
Multidecadal trend of increasing iron stress in Southern Ocean phytoplankton

Author: Ryan-Keogh, Thomas J ; Thomalla, Sandy J ; Scheel Monteiro, Pedro M ; Tagliabue, A Date: Feb 2023 Southern Ocean primary productivity is principally controlled by adjustments in light and iron limitation, but the spatial and temporal determinants of iron availability, accessibility, and demand are poorly constrained, which hinders accurate ... Read more
Phenology and environmental control of phytoplankton blooms in the Kong Håkon VII Hav in the Southern Ocean

Author: Kauko, HM ; Hattermann, T ; Ryan-Keogh, Thomas J ; Singh, Asmita ; De Steur, L ; Fransson, A ; Chierici, M ; Falkenhaug, T ; Hallfredsson, EH ; Bratbak, G Date: Mar 2021 Knowing the magnitude and timing of pelagic primary production is important for ecosystem and carbon sequestration studies, in addition to providing basic understanding of phytoplankton functioning. In this study we use data from an ecosystem ... Read more
Phenology and Environmental Control of Phytoplankton Blooms in the Kong Håkon VII Hav in the Southern Ocean

Author: Kauko, HM ; Hattermann, T ; Ryan-Keogh, Thomas J ; Singh, Asmita ; De Steur, L ; Fransson, A ; Chierici, M ; Falkenhaug, T ; Hallfredsson, EH ; Bratbak, G Date: Mar 2021 Knowing the magnitude and timing of pelagic primary production is important for ecosystem and carbon sequestration studies, in addition to providing basic understanding of phytoplankton functioning. In this study we use data from an ecosystem ... Read more
Phytoplankton photophysiology utilities: A python toolbox for the standardization of processing active chlorophyll-a fluorescence data

Author: Ryan-Keogh, Thomas J Date: Jul 2021 The uptake and application of single turnover chlorophyll fluorometers to the study of phytoplankton ecosystem status and microbial functions has grown considerably in the last two decades. However, standardization of measurement protocols, ... Read more
Recommendations for plankton measurements on OceanSITES moorings with relevance to other observing sites

Author: Boss, E ; Waite, AM ; Karstensen, J ; Trull, T ; Muller-Karger, F ; Sosik, HM ; Uitz, J ; Acinas, SG ; Acinas, SG ; Fennel, K ; Thomalla, Sandy J Date: Dec 2022 Measuring plankton and associated variables as part of ocean time-series stations has the potential to revolutionize our understanding of ocean biology and ecology and their ties to ocean biogeochemistry. It will open temporal scales (e.g., ... Read more
Remote sensing of phytoplankton community composition in the northern Benguela upwelling system

Author: Moloto, Tebatso M ; Thomalla, Sandy J ; Smith, Marie E ; Martin, B ; Louw, DC ; Koppelmann, R Date: Sep 2023 Marine phytoplankton in the northern Benguela upwelling system (nBUS) serve as a food and energy source fuelling marine food webs at higher trophic levels and thereby support a lucrative fisheries industry that sustain local economies in ... Read more
Sea-ice impacts inter-annual variability in bloom phenology and carbon export in the Weddell Sea

Author: Giddy, IS ; Nicholson, Sarah-Anne ; Queste, RY ; Thomalla, Sandy J ; Swart, S Date: Aug 2023 The Antarctic Marginal Ice Zone (MIZ) accounts for 15% of the Southern Ocean's primary production (PP), but limited data has hindered understanding of its variability and connection to carbon export. Using a combination of gliders, biogeochemical ... Read more
The seasonal cycle of nitrogen uptake and nitrification in the Atlantic sector of the Southern Ocean

Author: Mdutyana, M ; Thomalla, Sandy J ; Philibert, R ; Ward, BB ; Fawcett, SE Date: Jul 2020 Net primary production (NPP) fueled by nitrate is often equated with carbon export, providing a metric for CO2 removal to the deep ocean. This “new production paradigm” assumes that nitrification, the oxidation of regenerated ammonium to ... Read more
A seasonal transition in biological carbon pump efficiency in the northern Scotia Sea, Southern Ocean

Author: Henson, SA ; Briggs, N ; Carvalho, F ; Manno, C ; Mignot, A ; Thomalla, Sandy J Date: Apr 2023 The biological carbon pump (BCP) contributes to the oceanic CO2 sink by transferring particulate organic carbon (POC) into the deep ocean. The magnitude and efficiency of the BCP is likely to vary on timescales of days to seasons, however ... Read more c b n d

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