Stephen D. Archer
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The antimethanogenic efficacy and fate of bromoform and its transformation products in rumen fluid Open
Enteric methane emissions from ruminant livestock are a significant source of atmospheric methane. Efforts to address rising atmospheric methane concentrations have led to an expansion of research into mitigating enteric methane production…
Ocean alkalinity enhancement (OAE) does not cause cellular stress in a phytoplankton community of the subtropical Atlantic Ocean Open
A natural plankton community from oligotrophic subtropical waters of the Atlantic near Gran Canaria, Spain, was subjected to varying degrees of ocean alkalinity enhancement (OAE) to assess the potential physiological effects in the context…
View article: The seascape of VOC production and cycling in a tropical coral reef
The seascape of VOC production and cycling in a tropical coral reef Open
Volatile organic compounds (VOCs) have been proposed to indicate coral reef health, but little is known about their cycling processes in coral reefs and the roles of reef components. We studied the distribution and cycling of ocean-leaving…
View article: Iodine speciation in snow during the MOSAiC expedition and its implications for Arctic iodine emissions
Iodine speciation in snow during the MOSAiC expedition and its implications for Arctic iodine emissions Open
Photolysis of iodide in surface snow is a plausible mechanism for supplying reactive volatile iodine to the Arctic atmosphere.
View article: Warm and moist air intrusions drive black carbon deposition and accelerate central Arctic snowmelt
Warm and moist air intrusions drive black carbon deposition and accelerate central Arctic snowmelt Open
In the central Arctic, warm and moist air intrusions (WAMIs) are increasingly prevalent during winter and spring, significantly impacting the near-surface energy budget. This study investigates WAMI-induced transport and wet deposition of …
Functional stress responses in Glaucophyta: Evidence of ethylene and abscisic acid functions in <i>Cyanophora paradoxa</i> Open
Glaucophytes, an enigmatic group of freshwater algae, occupy a pivotal position within the Archaeplastida, providing insights into the early evolutionary history of plastids and their host cells. These algae possess unique plastids, known …
Assessing the impact of CO <sub>2</sub> -equilibrated ocean alkalinity enhancement on microbial metabolic rates in an oligotrophic system Open
Ocean alkalinity enhancement (OAE) is a negative emissions technology (NET) that shows significant potential for climate change mitigation. By increasing the bicarbonate ion concentration in ocean water, OAE could enhance long-term carbon …
Ocean Alkalinity Enhancement (OAE) does not cause cellular stress in a phytoplankton community of the sub-tropical Atlantic Ocean Open
A natural plankton community from oligotrophic subtropical waters of the Atlantic near Gran Canaria, Spain, was subjected to varying degrees of ocean alkalinity enhancement (OAE) to assess the potential physiological effects, in the contex…
A Cost Model for Ocean Iron Fertilization as a Means of Carbon Dioxide Removal That Compares Ship‐ and Aerial‐Based Delivery, and Estimates Verification Costs Open
We present a cost model for implementing a deployment scale effort for conducting ocean iron fertilization (OIF) for marine‐based carbon dioxide removal (CDR). The model incorporates basic oceanographic parameters critical for estimating t…
Comment on egusphere-2023-2409 Open
Abstract. Ocean Alkalinity Enhancement (OAE) is a Negative Emissions Technology (NET) that shows significant potential for climate change mitigation. By increasing the bicarbonate ion concentration in ocean water, OAE could enhance long-te…
Phytoplankton physiology and functional traits under artificial upwelling with varying Si:N Open
Introduction Artificial upwelling has been discussed as a nature-based solution to fertilize currently unproductive areas of the ocean to enhance food web productivity and atmospheric CO 2 sequestration. The efficacy of this approach may b…
Assessing the impact of CO <sub>2</sub> equilibrated ocean alkalinity enhancement on microbial metabolic rates in an oligotrophic system Open
Ocean Alkalinity Enhancement (OAE) is a Negative Emissions Technology (NET) that shows significant potential for climate change mitigation. By increasing the bicarbonate ion concentration in ocean water, OAE could enhance long-term carbon …
Functional stress responses in Glaucophyta: evidence of ethylene and abscisic acid functions in <i>Cyanophora paradoxa</i> Open
Glaucophytes, an enigmatic group of freshwater algae, occupy a pivotal position within the Archaeplastida, providing insights into the early evolutionary history of plastids and their host cells. These algae possess unique plastids, known …
Osmotrophy of dissolved organic compounds by coccolithophore populations: Fixation into particulate organic and inorganic carbon Open
Coccolithophores are typically thought of as photoautotrophs, yet a few genera inhabit sub-euphotic environments with insufficient light for photosynthesis, suggesting that other carbon acquisition strategies are likely. Field experiments …
Data for Widespread detection of chlorine oxyacids in the Arctic atmosphere: Villum Research Station and Ny-Ålesund observations Open
The data includes: 1) Data for the time series of HClO3 and HClO4 together with relevant data from the Villum Research Station observations. 2) Data for the time series of HClO3 from Ny-Ålesund observation. 3) Data of the estimated cross-s…
Data for Widespread detection of chlorine oxyacids in the Arctic atmosphere: Villum Research Station and Ny-Ålesund observations Open
The data includes: 1) Data for the time series of HClO3 and HClO4 together with relevant data from the Villum Research Station observations. 2) Data for the time series of HClO3 from Ny-Ålesund observation. 3) Data of the estimated cross-s…
Low ozone dry deposition rates to sea ice during the MOSAiC field campaign: Implications for the Arctic boundary layer ozone budget Open
Dry deposition to the surface is one of the main removal pathways of tropospheric ozone (O3). We quantified for the first time the impact of O3 deposition to the Arctic sea ice on the planetary boundary layer (PBL) O3 concentration and bud…
Thin and transient meltwater layers and false bottoms in the Arctic sea ice pack—Recent insights on these historically overlooked features Open
The rapid melt of snow and sea ice during the Arctic summer provides a significant source of low-salinity meltwater to the surface ocean on the local scale. The accumulation of this meltwater on, under, and around sea ice floes can result …
Modelling the coupled mercury-halogen-ozone cycle in the central Arctic during spring Open
Near-surface mercury and ozone depletion events occur in the lowest part of the atmosphere during Arctic spring. Mercury depletion is the first step in a process that transforms long-lived elemental mercury to more reactive forms within th…
Year-round trace gas measurements in the central Arctic during the MOSAiC expedition Open
Despite the key role of the Arctic in the global Earth system, year-round in-situ atmospheric composition observations within the Arctic are sparse and mostly rely on measurements at ground-based coastal stations. Measurements of a suite o…
Valorization of waste materials from seaweed industry: An industry survey based biorefinery approach Open
An increasing demand for carbon-neutral, sustainable alternatives to petrochemical products has invigorated interests around the industrial utilization of biomass and biomass-derived feedstocks.1, 2 In addition, a closed-loop system in whi…
View article: Benefits and Challenges of a Stakeholder-Driven Shellfish Toxicity Forecast in Coastal Maine
Benefits and Challenges of a Stakeholder-Driven Shellfish Toxicity Forecast in Coastal Maine Open
Paralytic shellfish poison (PSP) is a human health concern for shellfish aquaculture and wild harvest. This paper discusses lessons learned from a forecasting program for PSP in coastal Maine, USA, designed based on stakeholder input, and …
Saturation Approach to Determine Grazing Mortality in Picoeukaryote and Synechococcus Populations Open
A substantial component of phytoplankton production in the oceans is channeled through protistan grazers but understanding what dictates the magnitude of this process on a regional and temporal basis is limited, in part, by a shortage of e…
View article: Overview of the MOSAiC expedition: Atmosphere
Overview of the MOSAiC expedition: Atmosphere Open
With the Arctic rapidly changing, the needs to observe, understand, and model the changes are essential. To support these needs, an annual cycle of observations of atmospheric properties, processes, and interactions were made while driftin…
View article: Dihydrodinophysistoxin-1 Produced by Dinophysis norvegica in the Gulf of Maine, USA and Its Accumulation in Shellfish
Dihydrodinophysistoxin-1 Produced by Dinophysis norvegica in the Gulf of Maine, USA and Its Accumulation in Shellfish Open
Dihydrodinophysistoxin-1 (dihydro-DTX1, (M-H)−m/z 819.5), described previously from a marine sponge but never identified as to its biological source or described in shellfish, was detected in multiple species of commercial shellfish collec…
View article: The impacts of ocean acidification on marine trace gases and the implications for atmospheric chemistry and climate
The impacts of ocean acidification on marine trace gases and the implications for atmospheric chemistry and climate Open
Surface ocean biogeochemistry and photochemistry regulate ocean–atmosphere fluxes of trace gases critical for Earth's atmospheric chemistry and climate. The oceanic processes governing these fluxes are often sensitive to the changes in oce…