A5049791334- Atmospheric and Environmental Gas Dynamics
- Molecular Spectroscopy and Structure
- Methane Hydrates and Related Phenomena
- Peatlands and Wetlands Ecology
- Advanced Chemical Physics Studies
- Atmospheric Ozone and Climate
- Coastal wetland ecosystem dynamics
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Organoselenium and organotellurium chemistry
- Synthesis and characterization of novel inorganic/organometallic compounds
- Coal Properties and Utilization
- Chemical Reactions and Mechanisms
- Water Quality Monitoring and Analysis
- Offshore Engineering and Technologies
- Hydrocarbon exploration and reservoir analysis
- Photochemistry and Electron Transfer Studies
- Clinical Nutrition and Gastroenterology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and coastal ecosystems
- Soil and Water Nutrient Dynamics
- Carbon Dioxide Capture Technologies
- Microplastics and Plastic Pollution
- Landfill Environmental Impact Studies
- Chemical Reactions and Isotopes
Max Planck Institute for Biogeochemistry
2024
Memorial University of Newfoundland
2018-2023
St. Francis Xavier University
2022
Gansu Agricultural University
2022
Fort Hays State University
1981
Abstract. Vast amounts of methane (CH4) stored in submarine sediments are susceptible to release a warming Arctic, further exacerbating climate change positive feedback. It is therefore critical monitor CH4 over pan-regional scales detect early signs release. However, our ability hampered remote northern regions by sampling and logistical constraints, few good baseline data exist many areas. From high-resolution atmospheric measurements discrete surface water samples, we estimated...
According to recent data-driven upscaling, emissions from rivers in the Arctic-boreal region offset between half all of wetland carbon dioxide (CO2) sink, and release substantial amounts methane (CH4) despite their much smaller surface area. However, observational data natural riverine ecosystems this remain scarce, emission estimates show large uncertainties.In order estimate budget a river, we determined chamber-derived water-air fluxes partial pressures CO2 CH4 on four transects along...
The oil and gas industry is Canada’s largest contributor to national methane (CH4) emissions. To quantify the input of active inactive (suspended abandoned) infrastructure regional CH4 budgets, we conducted truck-based measurements (transect-based OTM 33A) with a greenhouse analyzer, complimented optical imaging at oil-producing sites Saskatchewan, including understudied regions. We found that regionally accounted for roughly 43% total measured emissions in Lloydminster, 9% Kindersley, 0%...
<div>Methane emissions were measured at ~7000 sites across major oil and gas producing regions in Canada to examine regional emission trends, derive an inventory estimate for Canada’s upstream sector. Emissions varied by fluid type geographic region, with the heavy region of Lloydminster ranking highest on both absolute intensity-based scales. Emission intensities widely natural production, where older, low-producing developments showed high intensities, intensity...
Temporal changes in a feedlot drainage lagoon with predominance of the phototrophic purple sulfur bacterium, Thiopedia rosea , were investigated during 3-year period. The surface protein and bacteriochlorophyll concentrations, which indirectly measure T. abundance, peaked annually fall months coincided intensity pink coloration. Surface concentration correlated pH, alkalinity, protein. pH range was optimal for survival rosea. sulfide concentration, increased over winter early spring, reached...
Climate warming and vegetation composition change are expected to influence greenhouse gas emissions from boreal peatlands. However, the interactive effects of different compositions on N2O dynamics poorly known, although is a very potent gas. In this study, manipulated were conducted in peatland investigate fluxes during growing seasons 2015 2016. We did not find significant effect treatment combination treatments fluxes. sedge removal significantly increased by three-fold. Compared with...
Cultures of Bacillus cereus were permitted to sporulate in a chemically defined sporulation medium containing various concentrations lactate and acetate. At intervals throughout the process intracellular concentration poly-?-hydroxybutyrate, sensitivity ultraviolet irradiation, number spores determined. Increasing acetate resulted increasing polymer. The maximum polymer accumulation within cells occurred approximately 3 hours before onset sporulation. Cells allowed accumulate more polymer,...
Abstract. Vast amounts of methane (CH4) stored in permafrost and submarine sediments are susceptible to release a warming Arctic, further exacerbating climate change positive feedback. It is therefore critical monitor CH4 over pan-regional scales detect early signs release. However, our ability hampered remote northern regions by sampling logistical constraints few good baseline data exist many areas. To create study current background levels North Atlantic waters, we collected continuous...
Arctic wetlands have been identified as significant emitters of CH4, accounting for about 2% the global methane budget, but underlying processes remain poorly constrained. These show not only a considerable variability in CH4 flux estimates, also varying levels emissions between different regions and even among various elements within same wetland. The pronounced spatial ecosystem characteristics across scales requires observational approaches that can cover larger landscapes while still...
Arctic and sub-Arctic regions host a large number of waterbodies that serve as carbon sources to the atmosphere within an environment is predominantly characterized by sequestration. The ongoing permafrost thaw in warming anticipated alter distribution freshwater ecosystems, subsequently affecting their contribution overall budget. Estimates global budgets largely disregard emissions caused thaw, also for ecosystems are highly uncertain date. A general constraint this field data scarcity...
The Arctic-boreal zone and its permafrost regions have historically been sparsely measured for carbon dioxide methane fluxes. This data sparsity has created significant uncertainties in budget estimates. However, over the past decade, availability of flux increased substantially. Yet, it remains scattered across different repositories, papers, unpublished sources, making hard to estimate more accurate budgets. To address this research gap, we compiled a database fluxes (ABCFlux v2) from...
Abstract. Our understanding of how rapid Arctic warming and permafrost thaw affect global climate dynamics is restricted by limited spatio-temporal data coverage due to logistical challenges the complex landscape regions. It therefore crucial make best use available observations, including integrated analysis across disciplines observational platforms. To alleviate compilation process for syntheses, cross-scale analyses, earth system models, remote sensing applications, we introduce ARGO, a...
Ninety-three bile samples, taken during surgery at three hospitals serving rural Kansas, were cultured for aerobic and anaerobic microorganisms. Forty-seven percent of the cultures positive 55% these grew anaerobes. Fifty (22 cultures) contained one species 15 Clostridium was most frequent isolate accounted 22% total isolates. Isolates recovered less frequently Escherichia coli (12%), Klebsiella (10%), Propionibacterium (10%). The containing anaerobes incidence high compared to other...
Canada is a signatory to the Global Methane Pledge and aiming achieve 75% cut in methane from 2030 levels oil gas production through regulatory updates 50% waste sector emissions using new regulations. Despite numerous large-scale studies that have measured identified emission sources Canada's sector, there are virtually no measurements of landfills Canada. As such, inventory values for landfill based on combination industry-submitted data factors. could design better policies regulations if...