Hannah Whitby
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View article: Distribution and behaviour of reduced sulfur substances in the oligotrophic and hydrothermal waters of the Western Tropical South Pacific
Distribution and behaviour of reduced sulfur substances in the oligotrophic and hydrothermal waters of the Western Tropical South Pacific Open
Reduced sulfur species (RSS) are involved in essential biological and chemical processes, including metal complexation, yet little is known about their occurrence and behaviour in marine systems. Here, we present a quantitative and qualita…
View article: A hydrothermal plume on the Southwest Indian Ridge revealed by a multi-proxy approach: Impact on iron and manganese distributions (GEOTRACES GS02)
A hydrothermal plume on the Southwest Indian Ridge revealed by a multi-proxy approach: Impact on iron and manganese distributions (GEOTRACES GS02) Open
International audience
View article: Iron-binding by dissolved organic matter in the Western Tropical South Pacific Ocean (GEOTRACES TONGA cruise GPpr14)
Iron-binding by dissolved organic matter in the Western Tropical South Pacific Ocean (GEOTRACES TONGA cruise GPpr14) Open
Iron (Fe) is an essential micronutrient for phytoplankton growth, but its scarcity in seawater limits primary productivity across much of the ocean. Most dissolved Fe (DFe) in seawater is complexed with Fe-binding organic ligands, a poorly…
View article: New Insights into the Organic Complexation of Bioactive Trace Metals in the Global Ocean from the GEOTRACES Era
New Insights into the Organic Complexation of Bioactive Trace Metals in the Global Ocean from the GEOTRACES Era Open
The GEOTRACES program has greatly expanded measurements of dissolved trace metal concentrations across ocean basins, but to understand the behavior and cycling of metals and their impacts on primary productivity, we must understand the che…
View article: The role of humic-type ligands in the bioavailability and stabilization of dissolved iron in the Western Tropical South Pacific Ocean
The role of humic-type ligands in the bioavailability and stabilization of dissolved iron in the Western Tropical South Pacific Ocean Open
The high N 2 fixation rate observed in the Lau Basin of the western tropical South Pacific Ocean (WTSP) is fueled by iron (Fe) released from shallow hydrothermal systems. Understanding Fe bioavailability is crucial but the controls on the …
View article: Influence of shallow hydrothermal fluid release on the functioning of phytoplankton communities
Influence of shallow hydrothermal fluid release on the functioning of phytoplankton communities Open
In the Western Tropical South Pacific (WTSP) Ocean, a hotspot of dinitrogen fixation has been identified. The survival of diazotrophs depends, among others, on the availability of dissolved iron (DFe) largely originating, as recently revea…
View article: Sources, sinks, and cycling of dissolved organic copper binding ligands in the ocean
Sources, sinks, and cycling of dissolved organic copper binding ligands in the ocean Open
Organic Cu-binding ligands have a fundamental influence on Cu distributions in the global ocean and they complex >99% of the dissolved Cu in seawater. Cu-binding ligands however, represent a large diversity of compounds with distinct sourc…
View article: Processes Driving Iron and Manganese Dispersal From the TAG Hydrothermal Plume (Mid-Atlantic Ridge): Results From a GEOTRACES Process Study
Processes Driving Iron and Manganese Dispersal From the TAG Hydrothermal Plume (Mid-Atlantic Ridge): Results From a GEOTRACES Process Study Open
Hydrothermal vents are a recognized source of trace elements to the ocean inventory. Nevertheless, the contribution of slow-spreading ridges remains poorly resolved. To address this, high-resolution dissolved (<0.45 μm) iron (dFe) and mang…
View article: New insights into the distributions of nitrogen fixation and diazotrophs revealed by high-resolution sensing and sampling methods
New insights into the distributions of nitrogen fixation and diazotrophs revealed by high-resolution sensing and sampling methods Open
Nitrogen availability limits marine productivity across large ocean regions. Diazotrophs can supply new nitrogen to the marine environment via nitrogen (N2) fixation, relieving nitrogen limitation. The distributions of diazotrophs and N2 f…
View article: A call for refining the role of humic-like substances in the oceanic iron cycle
A call for refining the role of humic-like substances in the oceanic iron cycle Open
Primary production by phytoplankton represents a major pathway whereby atmospheric CO 2 is sequestered in the ocean, but this requires iron, which is in scarce supply. As over 99% of iron is complexed to organic ligands, which increase iro…
View article: Contribution of Electroactive Humic Substances to the Iron‐Binding Ligands Released During Microbial Remineralization of Sinking Particles
Contribution of Electroactive Humic Substances to the Iron‐Binding Ligands Released During Microbial Remineralization of Sinking Particles Open
Iron is a key micronutrient in seawater, but concentrations would be negligible without the presence of organic ligands. The processes influencing the ligand pool composition are poorly constrained, limiting our understanding of the contro…
View article: Data for: Copper-binding ligands in the NE Pacific
Data for: Copper-binding ligands in the NE Pacific Open
Concentrations of dCu, strong and weak ligand classes and their binding capacities (log K values) obtained for stations P4 and P26 along Line P in the NE Pacific. Full details on sampling, treatment and analyses can be found in the manuscr…
View article: Copper-binding ligands in the NE Pacific
Copper-binding ligands in the NE Pacific Open
Copper distribution and speciation were determined at stations P4 and P26 along Line P as part of a GEOTRACES Process Study in the Northeast Pacific, at depths between 10 and 1400 m. Two ligand classes (L-1 and L-2) were detected at both s…
View article: Chemical Speciation of Copper in a Salt Marsh Estuary and Bioavailability to Thaumarchaeota
Chemical Speciation of Copper in a Salt Marsh Estuary and Bioavailability to Thaumarchaeota Open
The concentrations of dissolved copper (Cu-d), copper-binding ligands, thiourea-type thiols, and humic substances (HScu) were measured in estuarine waters adjacent to Sapelo Island, Georgia, USA, on a monthly basis from April to December 2…
View article: Hydrothermal impacts on trace element and isotope ocean biogeochemistry
Hydrothermal impacts on trace element and isotope ocean biogeochemistry Open
Hydrothermal activity occurs in all ocean basins, releasing high concentrations of key trace elements and isotopes (TEIs) into the oceans. Importantly, the calculated rate of entrainment of the entire ocean volume through turbulently mixin…