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Browsing by Subject "Southern Ocean"

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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
Application of a nonparametric approach to analyze delta-pCO2 data from the Southern Ocean

Author: Pretorius, WB ; Das, Sonali ; Mostert, PJ Date: Nov 2011 In this paper the authors discuss the application of a classical nonparametric inference approach to analyse delta-pCO2 measurements from the Southern Ocean, which is a novel method to analysing data in this area, as well as comparing results ... Read more
An assessment of the role of the k-e vertical mixing scheme in the simulation of Southern Ocean upper dynamics

Author: Boodhraj, K ; Vichi, M ; Smit, Jacoba E Date: Nov 2016 Following the work done by Reffrey, Calone and Bourdalle-Badie (2015) we implemented a one dimensional (1D) ocean physical model in the sub-Antarctic Southern Ocean using the Nucleus for the European Modelling of the Ocean(NEMO) model. The ... 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
Eddy dynamics in the Southern Ocean: How does the interaction of the Antarctic Circumpolar Current with sea-bed topography influence the surface mixed layer and hence the carbon-climate feedback processes?

Author: Kobo, Nomkwezane S ; Herbette, S ; Monteiro, Pedro MS ; Reason, C Date: Oct 2012 The Southern Ocean is an important sink for heat and CO2 and is one of the world’s most productive regions. The unique absence of blocking continents allows the Antarctic Circumpolar Current (ACC) to connect all ocean basins (Atlantic, Pacific ... Read more
Empirical methods for the estimation of Southern Ocean CO2: support vector and random forest regression

Author: Gregor, Luke ; Kok, S ; Monteiro, Pedro MS Date: Dec 2017 The Southern Ocean accounts for 40 % of oceanic CO2 uptake, but the estimates are bound by large uncertainties due to a paucity in observations. Gap-filling empirical methods have been used to good effect to approximate pCO2 from satellite ... Read more
Evaluation of chlorophyll-a and POC MODIS aqua products in the Southern Ocean

Author: Moutier, William ; Thomalla, Sandy J ; Bernard, Stewart ; Wind, G ; Ryan-Keogh, Thomas J ; Smith, Marie E Date: Jul 2019 The Southern Ocean (SO) is highly sensitive to climate change. Therefore, an accurate estimate of phytoplankton biomass is key to being able to predict the climate trajectory of the 21st century. In this study, MODerate resolution Imaging ... Read more
Evaluation of satellite and reanalysis wind products with in situ wave glider wind observations in the Southern Ocean

Author: Schmidt, KM ; Swart, S ; Reason, C ; Nicholson, Sarah-Anne Date: Dec 2017 Surface ocean wind datasets are required to be of high spatial and temporal resolution and high precision to accurately force or be assimilated into coupled atmosphere–ocean numerical models and to understand ocean–atmospheric processes. In ... Read more
Exposing XBT bias in the Atlantic sector of the Southern Ocean

Author: Hutchinson, KA ; Swart, S ; Ansorge, IJ ; Goni, GJ Date: Oct 2013 Hydrographic data from three research cruises, occupying the GoodHope line in the Atlantic sector of the Southern Ocean, are used to identify and quantify Expendable Bathythermograph (XBT) temperature biases. A set of 148 collocated XBT and ... 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
Investigating the complex relationship between in situ Southern Ocean pCO2 and its ocean physics and biogeochemical drivers using a nonparametric regression approach

Author: Pretorius, W ; Das, Sonali ; Monteiro, Pedro MS Date: Jan 2014 The objective in this paper is to investigate the use of a non-parametric model approach to model the relationship between oceanic carbon dioxide (pCO(sub2)) and a range of biogeochemical in situ variables in the Southern Ocean, which influence ... Read more
Investigating the turbulence response of a 1-D idealized water column located in the sub-Antarctic zone with focus on the upper ocean dynamics

Author: Boodhraj, Kirodh ; Vichi, M ; Smit, Jacoba E Date: Sep 2017 A one-dimensional ocean physical model was implemented in the sub-Antarctic Southern Ocean using the Nucleus for the European Modelling of the Ocean (NEMO) model. It was used to examine the effects of the turbulence response of the simulation ... Read more
Linking small-scale circulation dynamics with large-scale seasonal production (phytoplankton) in the Southern Ocean

Author: Nicholson, Sarah-Anne Date: Oct 2012 Understanding the seasonal and intra-seasonal (daily to weekly) changes of the upper ocean and the impact on the primary production in the Southern Ocean is key to better understanding the sensitivities of the global carbon cycle. Read more
New approaches for air-sea fluxes in the Southern Ocean

Author: Gille, S ; Josey, S ; Swart, Seb Date: May 2016 Air-sea exchanges in the Southern Ocean of momentum, heat, freshwater, carbon dioxide, and other gases are not well documented because fluxes are sparsely sampled (see Figure 1) and because high winds, high sea state, and lack of calibration ... 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 chemotaxonomy in the Atlantic sector of the Southern Ocean during late summer 2009

Author: Gibberd, M-J ; Kean, E ; Barlow, R ; Thomalla, Sandy J ; Lucas, M Date: Aug 2013 A chemotaxonomic investigation of surface phytoplankton was undertaken on a research cruise to the Atlantic sector of the Southern Ocean during late austral summer 2009. Based on pigment signatures, several distinct regions emerged that were ... Read more

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