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Browsing by Author "Fawcett, Sarah"

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Biogeochemical controls on ammonium accumulation in the surface layer of the TD: Southern Ocean

Author: Smith, Shantelle Date: 2022 The production and assimilation of ammonium (NH₄⁺) are essential upper-ocean nitrogen (N) cycle pathways. However, in the Southern Ocean where the alternation between biological nitrate drawdown in summer and physical nitrate resupply in ... Read more
Drivers of short-term variability in phytoplankton production in an embayment of the southern Benguela upwelling system: an observational and modelling study

Author: Burger, Jessica Date: 2018 In the southern Benguela upwelling system (SBUS), the wind-driven supply of nutrient-rich water from depth sustains elevated levels of primary productivity. St Helena Bay (SHB), a coastal embayment in the SBUS positioned north of an upwelling ... Read more
Exploring South Africa’s southern frontier: A 20-year vision for polar research through the South African National Antarctic Programme

Author: Ansorge, Isabelle J ; Skelton, Paul ; Bekker, Annie ; de Bruyn, P J Nico ; Butterworth, Doug S ; Cilliers, Pierre ; Cooper, John ; Cowan, Don A ; Dorrington, Rosemary ; Fawcett, Sarah ; Fietz, Susanne ; Findlay, Ken P ; Froneman, P William ; Grantham, Geoff H ; Greve, Michelle ; Hedding, David ; Hofmeyr, G J Greg ; Kosch, Michael ; le Roux, Peter ; Lucas, Mike ; MacHutcho, Keith ; Meiklejohn, Ian ; Nel, Werner ; Pistorius, Pierre ; Ryan, Peter ; Stander, Johan ; Swart, Sebastiaan ; Treasure, Anne ; Vichi, Marcello ; Jansen van Vuuren, Bettine Date: Jun 2017 Antarctica, the sub-Antarctic islands and surrounding Southern Ocean are regarded as one of the planet’s last remaining wildernesses, ‘insulated from threat by [their] remoteness and protection under the Antarctic Treaty System’1 . Antarctica ... Read more c b
Investigating the biogeochemistry of the Mozambique Channel thermocline using an optimum multiparameter analysis approach

Author: Harris, Eesaa Date: 2022 The ocean's thermocline represents the transition zone between the surface and deep ocean. Its formation is linked to vertical and horizontal diffusion, and it constitutes part of the ocean's wind driven circulation, playing a critical role ... Read more
Mixed layer nitrogen cycling in the Southern Ocean: seasonality, kinetics, and biogeochemical implications

Author: Mdutyana, Mhlangabezi Date: 2021 The alternation between summertime nitrate drawdown and wintertime nitrate recharge is central to the role of the Southern Ocean in setting atmospheric CO2. However, active cycling of nitrogen (N) in the seasonally-varying mixed layer – ... Read more
Modelling waves and near-shore circulation around the Cape Peninsula: towards enhanced predictions for South African coastal activities

Author: de Vos, Marc Date: 2022 South Africa's coastal oceans support a multitude of human and ecological interests. My work at the confluence of academia, industry and government highlighted a gap in knowledge and capacity in the marine environmental information space. ... Read more
On-shelf nutrient trapping enhances the fertility of the southern Benguela upwelling system

Author: Flynn, Raquel Date: 2019 The southern Benguela upwelling system (SBUS), located off the southwest coast of Africa, supports high rates of primary productivity that sustain important commercial fisheries. The exceptional fertility of this system is reportedly fuelled ... Read more
Toward an improved understanding of the Southern Ocean's biological pump: phytoplankton group-specific contributions to nitrogen and carbon cycling across the Subantarctic Indian Ocean

Author: Forrer, Heather Date: 2021 Iron (and silicate) (co-)limitation of phytoplankton is considered a primary cause of the Southern Ocean's inefficient biological pump. However, the role of phytoplankton community structure and response to nutrient cycling remains poorly ... Read more
Towards high fidelity mapping of global inland water quality using earth observation data

Author: Kravitz, Jeremy Date: 2021 This body of work aims to contribute advancements towards developing globally applicable water quality retrieval models using Earth Observation data for freshwater systems. Eutrophication and increasing prevalence of potentially toxic algal ... Read more
Wintertime nitrate isotope dynamics in the Atlantic sector of the Southern Ocean

Author: Smart, Sandi Date: 2014 We provide the first data on wintertime patterns of the nitrogen (N) and oxygen (O) isotopes of seawater nitrate for the region south of Africa. Water column profile and underway surface samples collected in July 2012 span a range of latitudes ... Read more

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Browsing by Author "Fawcett, Sarah"

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