Margot E. White
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View article: Deltaic Burial of Authigenic Calcite Modulates the Carbon Balance of Hardwater Lakes
Deltaic Burial of Authigenic Calcite Modulates the Carbon Balance of Hardwater Lakes Open
Inland waters play an important role in the terrestrial carbon cycle by burying carbon in aquatic sediments while simultaneously releasing CO2 to the atmosphere and laterally exporting carbon along the land-ocean aquatic continuum. Especia…
View article: Tropical cyclones drive oxygen minimum zone shoaling and simultaneously alter organic matter production
Tropical cyclones drive oxygen minimum zone shoaling and simultaneously alter organic matter production Open
Tropical cyclones regularly form above the ocean’s largest subsurface oxygen minimum zone (OMZ) in the eastern tropical North Pacific Ocean (ETNP), yet how these powerful storms affect this biogeochemically important region remains unknown…
View article: Tracing the export of terrestrial biospheric carbon from source-to-sink through molecular 14C analyses in two large Alpine catchments
Tracing the export of terrestrial biospheric carbon from source-to-sink through molecular 14C analyses in two large Alpine catchments Open
The residence time of organic carbon (OC) in terrestrial reservoirs, particularly soils and freshwater systems, plays a crucial role in modulating the dynamics of the global carbon cycle. Radiocarbon (14C) is an invaluable tool for tracing…
View article: Seasonally Dynamic Dissolved Carbon Cycling in a Large Hard Water Lake
Seasonally Dynamic Dissolved Carbon Cycling in a Large Hard Water Lake Open
Inland waters play a crucial role in the global carbon cycle, with lakes integrating carbon from various sources within their catchment in addition to that fixed by local primary productivity. Isotopic measurements of carbon pools can diff…
View article: Pre‐aged organic matter dominates organic carbon burial in a major perialpine lake system
Pre‐aged organic matter dominates organic carbon burial in a major perialpine lake system Open
Organic carbon (OC) burial in lake sediments is comparable to that in marine sediments globally. However, climatic and carbon cycle implications depend on the origin of buried OC. This study utilizes high‐resolution radiocarbon ( 14 C) mea…
View article: Sources and fate of dissolved inorganic carbon in rivers of Switzerland
Sources and fate of dissolved inorganic carbon in rivers of Switzerland Open
Each year, rivers export more than one teragram of carbon out of Switzerland as dissolved inorganic carbon (DIC), integrating diverse atmospheric, terrestrial, and aquatic carbon sources over their catchments. However, the contributions of…
View article: Radiocarbon measurements of archived fish scales reconstruct past carbon cycle changes in a peri-alpine lake
Radiocarbon measurements of archived fish scales reconstruct past carbon cycle changes in a peri-alpine lake Open
Climate change and other anthropogenic impacts such as nutrient pollution result in perturbations to freshwater systems that alter aquatic carbon cycling. In the alpine Rhine basin, for example, long-term monitoring over the past four deca…
View article: Constraining atmosphere-terrestrial-aquatic carbon cycle processes at national and ecoregional scales with radiocarbon data: Introducing the Radiocarbon Inventories of Switzerland (RICH) project
Constraining atmosphere-terrestrial-aquatic carbon cycle processes at national and ecoregional scales with radiocarbon data: Introducing the Radiocarbon Inventories of Switzerland (RICH) project Open
New constraints on carbon exchanges between atmospheric, terrestrial and aquatic systems are needed to reduce uncertainty in future predictions of the global carbon cycle and climate change. Radiocarbon is a powerful tool for studying the …
View article: Radiocarbon as a key constraint for prediction of river carbon biogeochemistry
Radiocarbon as a key constraint for prediction of river carbon biogeochemistry Open
The lateral transport of riverine carbon is a key component of the global carbon cycle, yet several aspects are poorly understood. In particular, the magnitude and nature of carbon cycle responses in freshwater aquatic networks to on-going…
View article: Direct radiocarbon measurements of dissolved inorganic carbon from environmental water using a gas ion source 
Direct radiocarbon measurements of dissolved inorganic carbon from environmental water using a gas ion source  Open
An increasing demand for radiocarbon analysis of small samples has led to the development of various methods to further improve and simplify the CO2 extraction needed for accelerator mass spectrometer (AMS) measurements. Here, the performa…
View article: Radiocarbon signatures of carbon phases exported by Swiss rivers in the Anthropocene
Radiocarbon signatures of carbon phases exported by Swiss rivers in the Anthropocene Open
Lateral carbon transport through the land-to-ocean-aquatic-continuum (LOAC) represents a key component of the global carbon cycle. This LOAC involves complex processes, many of which are prone to anthropogenic perturbation, yet the influen…
View article: Refractory Dissolved Organic Matter has Similar Chemical Characteristics but Different Radiocarbon Signatures With Depth in the Marine Water Column
Refractory Dissolved Organic Matter has Similar Chemical Characteristics but Different Radiocarbon Signatures With Depth in the Marine Water Column Open
The >5,000‐year radiocarbon age ( 14 C‐age) of much of the 630 ± 30 Pg C oceanic dissolved organic carbon (DOC) reservoir remains an enigma in the marine carbon cycle. The fact that DOC is significantly older than dissolved inorganic carbo…
View article: A new UV-Oxidation set up for AMS radiocarbon analysis for small dissolved organic carbon in marine and fresh water samples
A new UV-Oxidation set up for AMS radiocarbon analysis for small dissolved organic carbon in marine and fresh water samples Open
Radiocarbon measurements of dissolved organic carbon (DOC) can give us valuable information about origin and age of DOC, a major, yet little understood component in the global carbon cycle. One way to measure DOC in water is to remove diss…
View article: Using the radiocarbon bomb spike to constrain the age of soil organic carbon delivered to Lake Constance sediments.
Using the radiocarbon bomb spike to constrain the age of soil organic carbon delivered to Lake Constance sediments. Open
The residence time of carbon in terrestrial ecosystems, such as soils and freshwater, sets the pace of the terrestrial carbon cycle. Understanding export pathways and turnover times of soil organic carbon (OCSoil) is crucial to assess resp…
View article: A Radiocarbon Inventory of Switzerland’s Lakes
A Radiocarbon Inventory of Switzerland’s Lakes Open
The Radiocarbon Inventories of Switzerland (RICH) project aims to construct the first national-scale census of (radio)carbon across aquatic, terrestrial, and atmospheric reservoirs. Within the carbon cycle, inland waters play a crucial rol…
View article: Radiocarbon signatures of carbon phases exported by swiss rivers in the Anthropocene
Radiocarbon signatures of carbon phases exported by swiss rivers in the Anthropocene Open
Lateral carbon mobilization processes are particularly prone to anthropogenic perturbations due to human intervention of the land surface as well as aquatic corridors yet remain poorly constrained despite their importance as a key componen…
View article: Illuminating the dark metabolome of <i>Pseudo‐nitzschia</i> –microbiome associations
Illuminating the dark metabolome of <i>Pseudo‐nitzschia</i> –microbiome associations Open
The exchange of metabolites mediates algal and bacterial interactions that maintain ecosystem function. Yet, while thousands of metabolites are produced, only a few molecules have been identified in these associations. Using the ubiquitous…
View article: Novel sulfur isotope analyses constrain sulfurized porewater fluxes as a minor component of marine dissolved organic matter
Novel sulfur isotope analyses constrain sulfurized porewater fluxes as a minor component of marine dissolved organic matter Open
Marine dissolved organic matter (DOM) is a major reservoir that links global carbon, nitrogen, and phosphorus. DOM is also important for marine sulfur biogeochemistry as the largest water column reservoir of organic sulfur. Dissolved organ…
View article: Substantial oxygen consumption by aerobic nitrite oxidation in oceanic oxygen minimum zones
Substantial oxygen consumption by aerobic nitrite oxidation in oceanic oxygen minimum zones Open
Oceanic oxygen minimum zones (OMZs) are globally significant sites of biogeochemical cycling where microorganisms deplete dissolved oxygen (DO) to concentrations <20 µM. Amid intense competition for DO in these metabolically challenging en…
View article: Non-targeted tandem mass spectrometry enables the visualization of organic matter chemotype shifts in coastal seawater
Non-targeted tandem mass spectrometry enables the visualization of organic matter chemotype shifts in coastal seawater Open
Urbanization along coastlines alters marine ecosystems including contributing molecules of anthropogenic origin to the coastal dissolved organic matter (DOM) pool. A broad assessment of the nature and extent of anthropogenic impacts on coa…
View article: Non-target tandem mass spectrometry enables the prioritization of anthropogenic pollutants in seawater along the northern San Diego coast
Non-target tandem mass spectrometry enables the prioritization of anthropogenic pollutants in seawater along the northern San Diego coast Open
Anthropogenic pollutants inundate marine ecosystems as human population growth and urbanization rapidly increase along the coast. The analytical methods applied to detect anthropogenic imprints in coastal seawater are historically aimed at…
View article: Non-Targeted Metabolomics Enables the Prioritization and Tracking of Anthropogenic Pollutants in Coastal Seawater
Non-Targeted Metabolomics Enables the Prioritization and Tracking of Anthropogenic Pollutants in Coastal Seawater Open
Anthropogenic pollutants inundate marine ecosystems as human population growth and urbanization rapidly increase along the coast. Our analytical methods are typically aimed at measuring and monitoring a restricted number of compounds. To p…
View article: Non-targeted tandem mass spectrometry enables the visualization of organic matter chemotype shifts in coastal seawater
Non-targeted tandem mass spectrometry enables the visualization of organic matter chemotype shifts in coastal seawater Open
Urbanization along coastlines alters marine ecosystems including contributing molecules of anthropogenic origin to the coastal dissolved organic matter (DOM) pool. A broad assessment of the nature and extent of anthropogenic impacts on coa…
View article: Recent Increases in Water Column Denitrification in the Seasonally Suboxic Bottom Waters of the Santa Barbara Basin
Recent Increases in Water Column Denitrification in the Seasonally Suboxic Bottom Waters of the Santa Barbara Basin Open
Denitrification in the anoxic sediments of the Santa Barbara Basin has been well documented in the historic and modern record, but the regulation of and frequency with which denitrification occurs in the overlying water column are less und…
View article: Mass Spectrometry-Based Visualization of Molecules Associated with Human Habitats
Mass Spectrometry-Based Visualization of Molecules Associated with Human Habitats Open
The cars we drive, the homes we live in, the restaurants we visit, and the laboratories and offices we work in are all a part of the modern human habitat. Remarkably, little is known about the diversity of chemicals present in these enviro…