Matthew Humphreys
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View article: Blank variability in coulometric measurements of dissolved inorganic carbon
Blank variability in coulometric measurements of dissolved inorganic carbon Open
Marine dissolved inorganic carbon (DIC) is by far the largest pool of carbon in the Earth surface system that exchanges with the atmosphere on human-relevant timescales. Measurements of DIC are therefore necessary to study the changing mar…
View article: Mature Listeria monocytogenes Biofilms Exhibit Reduced Susceptibility to Sanitizers – Relevance to the (Leafy Green) Fresh Food Supply Chain
Mature Listeria monocytogenes Biofilms Exhibit Reduced Susceptibility to Sanitizers – Relevance to the (Leafy Green) Fresh Food Supply Chain Open
Salads and herbs are important for a healthy diet but during their processing and packaging, they may be exposed to environmental contamination from foodborne pathogens. Of particular concern is Listeria monocytogenes, a Gram-positive, fac…
View article: Marine carbonate system variability from tidal to seasonal timescales at the interface between the North Sea and Wadden Sea
Marine carbonate system variability from tidal to seasonal timescales at the interface between the North Sea and Wadden Sea Open
Shelf seas are important for global carbon cycling, but their carbonate system dynamics remain poorly understood due to complex spatial and temporal variability driven by interacting biological, physical and hydrological processes. To unde…
View article: Supplementary material to "Marine carbonate system variability from tidal to seasonal timescales at the interface between the North Sea and Wadden Sea"
Supplementary material to "Marine carbonate system variability from tidal to seasonal timescales at the interface between the North Sea and Wadden Sea" Open
View article: Solubility of high-magnesium calcite in seawater and its implementation in (Py)CO2SYS
Solubility of high-magnesium calcite in seawater and its implementation in (Py)CO2SYS Open
The calcium carbonate pump is an important part of the ocean's carbon cycle but our knowledge of it is incomplete. For example, alkalinity data suggest that carbonate mineral dissolution happens at shallow depths where bulk seawater is ove…
View article: Supplementary material to "Solubility of high-magnesium calcite in seawater and its implementation in (Py)CO2SYS"
Supplementary material to "Solubility of high-magnesium calcite in seawater and its implementation in (Py)CO2SYS" Open
View article: Reply to RC2
Reply to RC2 Open
View article: Reply on RC1
Reply on RC1 Open
View article: From small-scale variability to mesoscale stability in surface ocean pH: implications for air–sea CO <sub>2</sub> equilibration
From small-scale variability to mesoscale stability in surface ocean pH: implications for air–sea CO <sub>2</sub> equilibration Open
One important aspect of understanding ocean acidification is the nature and drivers of pH variability in surface waters on smaller spatial (i.e. areas up to 100 km2) and temporal (i.e. days) scales. However, there has been a lack of high-q…
View article: Blank variability in coulometric measurements of dissolved inorganic carbon
Blank variability in coulometric measurements of dissolved inorganic carbon Open
Marine dissolved inorganic carbon (DIC) is by far the largest pool of carbon in the Earth surface system that exchanges with the atmosphere on human-relevant timescales. Measurements of DIC are therefore necessary to study the changing mar…
View article: Spatial redistribution of a globally constant marine biological carbon pump
Spatial redistribution of a globally constant marine biological carbon pump Open
Marine dissolved inorganic carbon (DICtotal) is a key component of the global ocean carbon cycle. Over recent decades, DIC has increased due to rising anthropogenic CO2, but the component of DIC change due to the biological carbon pump (BC…
View article: RADIv2, an Adaptable and Versatile Diagenetic Model for Coastal and Open-Ocean Sediments
RADIv2, an Adaptable and Versatile Diagenetic Model for Coastal and Open-Ocean Sediments Open
Ocean biogeochemistry is being altered by anthropogenic processes such as warming, acidification, eutrophication, and deoxygenation. Global-ocean biogeochemistry models are essential for investigating present and projecting future conditio…
View article: Comment on egusphere-2025-458
Comment on egusphere-2025-458 Open
View article: Synthesis of data products for ocean carbonate chemistry
Synthesis of data products for ocean carbonate chemistry Open
As the largest active carbon reservoir on Earth, the ocean is a cornerstone of the global carbon cycle, playing a pivotal role in modulating ocean health and regulating climate. Understanding these crucial roles requires access to a broad …
View article: Maintaining Inter-Comparability of Nutrient Measurements
Maintaining Inter-Comparability of Nutrient Measurements Open
Measurements of marine nutrient concentrations are necessary to investigate global biogeochemical cycles, including in the context of climate change, as nutrients are closely coupled to the carbon cycle. To study these phenomena on a globa…
View article: From small scale variability to mesoscale stability in surface ocean pH: implications for air-sea CO <sub>2</sub> equilibration
From small scale variability to mesoscale stability in surface ocean pH: implications for air-sea CO <sub>2</sub> equilibration Open
One important aspect of understanding ocean acidification is the nature and drivers of pH variability in surface waters on smaller spatial (i.e., areas up to 100 km2) and temporal (i.e., days) scales. However, there has been a lack of high…
View article: Supplementary material to "From small scale variability to mesoscale stability in surface ocean pH: implications for air-sea CO <sub>2</sub> equilibration"
Supplementary material to "From small scale variability to mesoscale stability in surface ocean pH: implications for air-sea CO <sub>2</sub> equilibration" Open
View article: Temperature effect on seawater <i>f</i> CO <sub>2</sub> revisited: theoretical basis, uncertainty analysis and implications for parameterising carbonic acid equilibrium constants
Temperature effect on seawater <i>f</i> CO <sub>2</sub> revisited: theoretical basis, uncertainty analysis and implications for parameterising carbonic acid equilibrium constants Open
The sensitivity of the fugacity of carbon dioxide in seawater (fCO2) to temperature (denoted υ, reported in % °C−1) is critical for the accurate fCO2 measurements needed to build global carbon budgets and for understanding the drivers of a…
View article: The Changing Biological Carbon Pump of the South Atlantic Ocean
The Changing Biological Carbon Pump of the South Atlantic Ocean Open
Global marine anthropogenic CO 2 inventories have traditionally emphasized the North Atlantic's role in the carbon cycle, while Southern hemisphere processes are less understood. The South Subtropical Convergence (SSTC) in the South Atlant…
View article: Synthesis of In Situ Marine Calcium Carbonate Dissolution Kinetic Measurements in the Water Column
Synthesis of In Situ Marine Calcium Carbonate Dissolution Kinetic Measurements in the Water Column Open
Calcium carbonate (CaCO 3 ) dissolution is an integral part of the ocean's carbon cycle. However, laboratory measurements and ocean alkalinity budgets disagree on the rate and loci of dissolution. In situ dissolution studies can help to br…
View article: The annual update GLODAPv2.2023: the global interior ocean biogeochemical data product
The annual update GLODAPv2.2023: the global interior ocean biogeochemical data product Open
The Global Ocean Data Analysis Project (GLODAP) is a synthesis effort providing regular compilations of surface to bottom ocean biogeochemical bottle data, with an emphasis on seawater inorganic carbon chemistry and related variables deter…
View article: The Changing Biological Carbon Pump of the South Atlantic Ocean
The Changing Biological Carbon Pump of the South Atlantic Ocean Open
Global marine anthropogenic CO2 inventories have traditionally emphasized the North Atlantic’s role in the carbon cycle, while Southern hemisphere processes are less understood. The South Subtropical Convergence (SSTC) in the South Atlanti…
View article: Post-mortem pteropod degradation in the Southern Atlantic twilight zone
Post-mortem pteropod degradation in the Southern Atlantic twilight zone Open
Part of the carbon taken up by the ocean is transformed into biogenic particulate matter, that eventually leaves the surface ocean, settling toward the seafloor. Planktonic organisms secreting a calcium carbonate (CaCO3) shell occupy a key…
View article: Supplementary material to "Temperature effect on seawater ƒCO <sub>2</sub> revisited: theoretical basis, uncertainty analysis, and implications for parameterising carbonic acid equilibrium constants"
Supplementary material to "Temperature effect on seawater ƒCO <sub>2</sub> revisited: theoretical basis, uncertainty analysis, and implications for parameterising carbonic acid equilibrium constants" Open
View article: Temperature effect on seawater ƒCO <sub>2</sub> revisited: theoretical basis, uncertainty analysis, and implications for parameterising carbonic acid equilibrium constants
Temperature effect on seawater ƒCO <sub>2</sub> revisited: theoretical basis, uncertainty analysis, and implications for parameterising carbonic acid equilibrium constants Open
The sensitivity of the fugacity of carbon dioxide in seawater (ƒCO2) to temperature (denoted υ, reported in % °C–1) is critical for the accurate ƒCO2 measurements needed to build global carbon budgets and for understanding the drivers of a…
View article: Comment on essd-2023-468
Comment on essd-2023-468 Open
Abstract. The Global Ocean Data Analysis Project (GLODAP) is a synthesis effort providing regular compilations of surface-to-bottom ocean biogeochemical bottle data, with an emphasis on seawater inorganic carbon chemistry …
View article: Laboratory Observation of the Buffering Effect of Aragonite Dissolution at the Seafloor
Laboratory Observation of the Buffering Effect of Aragonite Dissolution at the Seafloor Open
Carbon dioxide entering and acidifying the ocean can be neutralized by the dissolution of calcium carbonate, which is mainly found in two mineral forms. Calcite is the more stable form and is often found in deep‐sea sediments, whilst arago…
View article: The annual update GLODAPv2.2023: the global interior ocean biogeochemical data product
The annual update GLODAPv2.2023: the global interior ocean biogeochemical data product Open
The Global Ocean Data Analysis Project (GLODAP) is a synthesis effort providing regular compilations of surface-to-bottom ocean biogeochemical bottle data, with an emphasis on seawater inorganic carbon chemistry and related variables deter…
View article: Supplementary material to "The annual update GLODAPv2.2023: the global interior ocean biogeochemical data product"
Supplementary material to "The annual update GLODAPv2.2023: the global interior ocean biogeochemical data product" Open
The Global Ocean Data Analysis Project (GLODAP) is a synthesis effort providing regular compilations of surface-to-bottom ocean biogeochemical bottle data, with an emphasis on seawater inorganic carbon chemistry and related variables deter…
View article: Proton Binding Characteristics of Dissolved Organic Matter Extracted from the North Atlantic
Proton Binding Characteristics of Dissolved Organic Matter Extracted from the North Atlantic Open
Marine dissolved organic matter (DOM) presents key thermodynamic properties that are not yet fully constrained. Here, we report the distribution of binding sites occupied by protons (i.e., proton affinity spectra) and parametrize the media…