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Browsing by Author "Nicholson, Sarah-Anne"

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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
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
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
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
Investigation into the impact of storms on sustaining summer primary productivity in the Sub-Antarctic Ocean

Author: Nicholson, Sarah-Anne ; Lévy, M ; Llort, J ; Swart, S ; Monteiro, Pedro MS Date: Sep 2016 In the Sub-Antarctic Ocean elevated phytoplankton biomass persists through summer at a time when productivity is expected to be low due to iron limitation. Biological iron recycling has been shown to support summer biomass. In addition, we ... 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
OceanGliders: A component of the integrated GOOS

Author: Testor, P ; De Young, B ; Rudnick, DL ; Glenn, S ; Hayes, D ; Lee, CM ; Pattiaratchi, C ; Krug, Marjolaine J ; Nicholson, Sarah-Anne ; Hill, K Date: Oct 2019 The OceanGliders program started in 2016 to support active coordination and enhancement of global glider activity. OceanGliders contributes to the international efforts of the Global Ocean Observation System (GOOS) for Climate, Ocean Health, ... 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
Southern ocean carbon and heat impact on climate

Author: Sallée, JB ; Abrahamsen, EP ; Allaigre, C ; Brearley, JA ; De Lavergne, C ; Ten Doeschate, AMM ; Droste, ES ; Monteiro, PMS ; Nicholson, Sarah-Anne ; The SO-CHI Consortium untranslated Date: May 2023 The Southern Ocean greatly contributes to the regulation of the global climate by controlling important heat and carbon exchanges between the atmosphere and the ocean. Rates of climate change on decadal timescales are therefore impacted by ... Read more
The Southern Ocean mixed layer and its boundary fluxes: Fine-scale observational progress and future research priorities

Author: Swart, S ; Du Plessis, MD ; Nicholson, Sarah-Anne ; Monteiro, Pedro MS ; Dove, LA ; Thomalla, Sandy J ; Thompson, AF ; Biddle, LC ; Edholm, JM ; Giddy, Isabelle Date: May 2023 Interactions between the upper ocean and air-ice-ocean fluxes in the Southern Ocean play a critical role in global climate by impacting the overturning circulation and oceanic heat and carbon uptake. Remote and challenging conditions have led ... Read more
Southern Ocean phytoplankton dynamics and carbon export: Insights from a seasonal cycle approach

Author: Thomalla, Sandy J ; Du Plessis, M ; Fauchereau, N ; Giddy, I ; Gregor, L ; Henson, S ; Joubert, WR ; Little, H ; Monteiro, Pedro MS ; Mtshali, T ; Nicholson, Sarah-Anne ; Ryan-Keogh, Thomas J ; Swart, S Date: May 2023 Quantifying the strength and efficiency of the Southern Ocean biological carbon pump (BCP) and its response to predicted changes in the Earth's climate is fundamental to our ability to predict long-term changes in the global carbon cycle and, ... Read more
Stirring of sea-ice meltwater enhances submesoscale fronts in the Southern Ocean

Author: Giddy, Isabelle ; Swart, S ; Du Plessis, Marcel ; Thompson, AF ; Nicholson, Sarah-Anne Date: Mar 2021 In the sea-ice-impacted Southern Ocean, the spring sea-ice melt and its impact on physical processes set the rate of surface water mass modification. These modified waters will eventually subduct near the polar front and enter the global ... Read more
Storms drive outgassing of CO2 in the subpolar Southern Ocean

Author: Nicholson, Sarah-Anne ; Whitt, DB ; Fer, I ; Du Plessis, Marcel ; Lebéhot, Alice D ; Swart, S ; Sutton, AJ ; Monteiro, Pedro MS Date: Jan 2022 The subpolar Southern Ocean is a critical region where CO2 outgassing influences the global mean air-sea CO2 flux (FCO2). However, the processes controlling the outgassing remain elusive. We show, using a multi-glider dataset combining FCO2 ... Read more
Submesoscale fronts in the antarctic marginal ice zone and their response to wind forcing

Author: Swart, S ; Du Plessis, MD ; Thompson, AF ; Biddle, LC ; Giddy, I ; Linders, T ; Mohrmann, M ; Nicholson, Sarah-Anne Date: Mar 2020 Submesoscale flows in the ocean are energetic motions, O(1–10 km), that influence stratification and the distributions of properties, such as heat and carbon. They are believed to play an important role in sea-ice-impacted oceans by modulating ... Read more
Vertical convergence of turbulent and double-diffusive heat flux drives warming and erosion of Antarctic Winter Water in summer

Author: Giddy, IS ; Fer, I ; Swart, S ; Nicholson, Sarah-Anne Date: May 2023 The seasonal warming of Antarctic Winter Water (WW) is a key process that occurs along the path of deep water transformation to intermediate waters. These intermediate waters then enter the upper branch of the circumpolar overturning circulation. ... Read more

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