Douglas W.R. Wallace
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Effect of Strain Applied During Thermomechanical Processing on Austenite Grain Size After Carburizing in Microalloyed Steels Open
Thermomechanical processing (TMP) in the warm work temperature regime, coupled with microalloying, can produce fine austenite grains that resist growth during carburizing, which is an essential requirement for electric vehicle drivetrain c…
The coupled oxygen and carbon dynamics in the subsurface waters of the Gulf and Lower St. Lawrence Estuary and implications for artificial oxygenation Open
The Gulf and Lower St. Lawrence Estuary have experienced major environmental change over the past century, including the development of hypoxic bottom waters and their simultaneous warming and acidification. Here, we use biogeochemical obs…
The changing composition of the Gulf of St. Lawrence inflow waters observed from transient tracer measurements Open
The deep waters of the Gulf of St. Lawrence (GSL) have experienced a significant reduction in dissolved oxygen content during the past decades. One widely documented driver of this deoxygenation is a change in the composition of the deep i…
New Deoxygenation Threshold for N<sub>2</sub> and N<sub>2</sub>O Production in Coastal Waters and Sediments Open
Bioavailable nitrogen governs ocean productivity and carbon fixation by regulating phytoplankton growth and community composition. Nitrogen input primarily results from fixation, while denitrification and anammox remove bioavailable nitrog…
The coupled oxygen and carbon dynamics in the subsurface waters of the Gulf and Lower St. Lawrence Estuary and Implications for Artificial Oxygenation Open
The Gulf and Lower St. Lawrence Estuary have experienced major environmental change over the past century, including the development of hypoxic bottom waters and their simultaneous warming and acidification. Here, we use biogeochemical obs…
A Pilot Site Study to Remediate Low oxygen Conditions in Coastal Seas Open
Deoxygenation of the marine environment has been linked to: 1) global climate change, through decreasing gas solubility, increased stratification reducing deep ventilation and changes of the spatiotemporal and biogeochemical properties of …
An observation-based method to estimate carbonate system variations in the Labrador Sea Open
The ocean carbonate system consists of pH, alkalinity, inorganic carbon and the partial pressure of carbon dioxide, and during the current era of anthropogenic change, its dynamics are key for understanding changes in the ocean and its eco…
Thriving Through Synergy: Fostering a SOLAS Science Community Built on Equity, International Connections, and the Integration of Early Career Scientists Open
The Surface Ocean-Lower Atmosphere Study (SOLAS) is a global research network dedicated to advancing coupled oceanographic and atmospheric science, a field that requires both interdisciplinary and globally distributed expertise. Since 2004…
To kill or to piggyback: Switching of viral lysis-lysogeny strategies depending on host dynamics Open
Viruses wield significant influence over microbial communities and ecosystem function in marine environments. However, the selection of viral life strategies and their impacts on microbial communities remains enigmatic. In this study, we u…
Seasonality of pCO2 and air-sea CO2 fluxes in the Central Labrador Sea Open
The Labrador Sea in the subpolar North Atlantic is known for its large air-to-sea CO 2 fluxes, which can be around 40% higher than in other regions of intense ocean uptake like the Eastern Pacific and within the Northwest Atlantic. This re…
Deep inflow transport and dispersion in the Gulf of St. Lawrence revealed by a tracer release experiment Open
The Gulf of St. Lawrence is increasingly affected by bottom water hypoxia; however, the timescales and pathways of deep water transport remain unclear. Here, we present results from the Deep Tracer Release eXperiment (TReX Deep), during wh…
Fixed-nitrogen loss in a deoxygenating coastal ocean: Insights from the Estuary and Gulf of St. Lawrence Open
Bioavailable nitrogen governs ocean productivity and carbon fixation by regulating phytoplankton growth and community composition. Nitrogen input primarily results from fixation, while denitrification and ANAMMOX removes bioavailable nitro…
Use of an urban fjord as a living laboratory for understanding impacts of hypoxia on nitrous oxide production and iodine cycling, and for testing of mitigation strategies. Open
The Bedford Basin is a a 70 m deep, seasonally stratified and hypoxic semi-enclosed fjord on the West Atlantic coast (Nova Scotia, Canada). The basin is connected to the Atlantic Ocean (Scotian Shelf) via a narrow 20 m deep sill that restr…
Ocean Alk-Align: an international research project to assess the potential of Ocean Alkalinity Enhancement for marine Carbon Dioxide Removal Open
Of the various marine Carbon Dioxide Removal (CDR) technologies proposed to date, ocean alkalinity enhancement (OAE) has, arguably, the largest carbon removal potential. OAE has several advantages over other approaches: it does not compete…
The global energy transition offers new options for mitigation of coastal hypoxia: Do we know enough? Open
The mitigation of climate change and pollution-related hypoxia and anoxia is a growing challenge for coastal communities. Known ocean conservation measures do not show the desired fast results counteracting deoxygenation. The new infrastru…
Comment on egusphere-2023-2538 Open
Abstract. We use output of an eddy-permitting biogeochemical ocean general circulation model to investigate the drivers of the observed decline in the pre-bloom inventory of dissolved silicate (DSi) and its InterAnnual Variability (IAV) ov…
Comment on egusphere-2023-2538 Open
Abstract. We use output of an eddy-permitting biogeochemical ocean general circulation model to investigate the drivers of the observed decline in the pre-bloom inventory of dissolved silicate (DSi) and its InterAnnual Variability (IAV) ov…
Contribution of physical processes to variability of dissolved silicate in the Labrador Sea between 1980 and 2015 Open
We use output of an eddy-permitting biogeochemical ocean general circulation model to investigate the drivers of the observed decline in the pre-bloom inventory of dissolved silicate (DSi) and its InterAnnual Variability (IAV) over the per…
Fjords Are Potential Hotspots of Refractory Dissolved Organic Matter Production: Insights From 1 Year of Weekly Time‐Series Observations of Fluorescent Dissolved Organic Matter in the Bedford Basin, a Northwestern Atlantic Fjord Open
Fjords are representative marine ecosystems that play an important role in regulating coastal carbon cycling. As fingerprints of the dissolved organic matter (DOM) pool, fluorescent DOM (FDOM) is widely used to study the ocean carbon cycle…
Decadal variability of oxygen uptake, export, and storage in the Labrador Sea from observations and CMIP6 models Open
The uptake of dissolved oxygen from the atmosphere via air-sea gas exchange and its physical transport away from the region of uptake are crucial for supplying oxygen to the deep ocean. This process takes place in a few key regions that fe…
Speciation of dissolved inorganic iodine in a coastal fjord: a time-series study from Bedford Basin, Nova Scotia, Canada Open
We report a long-term (4.5 year) time-series with weekly resolution of iodide and iodate measurements made at 4 depths within the Bedford Basin: a 70 m deep, seasonally stratified, coastal fjord located near Halifax, Nova Scotia, Canada. T…
Speciation of Dissolved Inorganic Iodine in a Coastal Fjord: A Time-Series Study from Bedford Basin, Nova Scotia, Canada Open
4.5 years observation of iodine in Bedford Basin, Nova Scotia, Canada.
Sources and sinks of bottom water oxygen in a seasonally hypoxic fjord Open
Deoxygenation of the ocean has been occurring over the last half century, particularly in poorly ventilated coastal waters. In coastal and estuarine environments, both the water column and sediments play key roles in controlling oxygen var…
View article: Temporal and spatial evolution of bottom-water hypoxia in the St Lawrence estuarine system
Temporal and spatial evolution of bottom-water hypoxia in the St Lawrence estuarine system Open
Persistent hypoxic bottom waters have developed in the Lower St Lawrence Estuary (LSLE) and have impacted fish and benthic species distributions. Minimum dissolved oxygen concentrations decreased from ∼ 125 µmol L−1 (38 % saturation) in th…
Formation of intermediate water in the Greenland Sea during the 1990s Open
The transformation rates of upper water into intermediate water (500 to 1600 m) of the central Greenland Sea are deduced from annual changes in CFC tracer inventories between 1991 and 2000. Transformation was found to be intermittent in ti…
View article: Comment on egusphere-2022-1090
Comment on egusphere-2022-1090 Open
Persistent hypoxic bottom waters have developed in the Lower St. Lawrence Estuary (LSLE) and have impacted fish and benthic species distributions. Minimum dissolved oxygen concentrations decreased from ~125 µmol L-1 (38 % saturation) in th…