Matthew S. Johnson
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View article: Hyperlocal air pollution in London: Nitrogen dioxide measured with a low-cost sensor network and mobile monitoring
Hyperlocal air pollution in London: Nitrogen dioxide measured with a low-cost sensor network and mobile monitoring Open
View article: EigenFlux: A Stable Multi-Stream Radiative Transfer Method for Strongly Backward-Scattering Media
EigenFlux: A Stable Multi-Stream Radiative Transfer Method for Strongly Backward-Scattering Media Open
The radiative transfer (RT) of light and radiation through a medium such as an atmosphere, pigment, or water is of interest to many research communities, such as atmospheric physics and chemistry, metereology, climate research, astronomy, …
View article: Hydrogen Peroxide in the North China Plain: A Review of Can Ye et al.
Hydrogen Peroxide in the North China Plain: A Review of Can Ye et al. Open
View article: First field Demonstration of a Novel Gas-Phase Photo-oxidation Method for Mitigation of Methane, Ammonia, and Odor from Agricultural sources
First field Demonstration of a Novel Gas-Phase Photo-oxidation Method for Mitigation of Methane, Ammonia, and Odor from Agricultural sources Open
There is significant climate and environmental benefit to mitigating the environmental impacts of livestock and biogas production. Methane is a strong greenhouse gas that leads to global warming, ammonia emissions pollute groundwater, and …
View article: Photocatalytic Chlorine Production From Iron Chlorides in Atmospheric Aerosols: Strategies for Quantifying Methane and Tropospheric Ozone Control
Photocatalytic Chlorine Production From Iron Chlorides in Atmospheric Aerosols: Strategies for Quantifying Methane and Tropospheric Ozone Control Open
It was recently discovered that chlorine is produced photocatalytically from mineral dust‐sea spray aerosols, impacting methane and tropospheric ozone, and an evaluation was made of the climate and environmental impact of a chlorine‐based …
View article: Feasibility of robust estimates of ozone production rates using a synergy of satellite observations, ground-based remote sensing, and models
Feasibility of robust estimates of ozone production rates using a synergy of satellite observations, ground-based remote sensing, and models Open
Ozone pollution is secondarily produced through a complex, non-linear chemical process. Our understanding of the spatiotemporal variations in photochemically produced ozone (i.e., PO3) is limited to sparse aircraft campaigns and chemical t…
View article: Advanced airborne eDNA sampling allows robust spatiotemporal characterisation of vertebrate communities
Advanced airborne eDNA sampling allows robust spatiotemporal characterisation of vertebrate communities Open
Effective biodiversity survey methods are crucial for monitoring ecosystems threatened by climatic fluctuations and anthropogenic pressures. Here we advance methods for the collection of a novel source of biodiversity data - airborne envir…
View article: Removing Ammonia, Odor and Dilute Methane from Ventilation Air from Cow, Pig and Biogas Facilities
Removing Ammonia, Odor and Dilute Methane from Ventilation Air from Cow, Pig and Biogas Facilities Open
There is significant interest in mitigating the environmental impacts of cow and pig production, and biogas manufacture. Ammonia emissions pollute groundwater, public agencies regulate odor for obvious reasons, and there is an increased fo…
View article: Comment on egusphere-2024-3860
Comment on egusphere-2024-3860 Open
View article: Comment on egusphere-2024-3937
Comment on egusphere-2024-3937 Open
View article: Comments on ‘Intended and Unintended Consequences of Atmospheric Methane Oxidation Enhancement’
Comments on ‘Intended and Unintended Consequences of Atmospheric Methane Oxidation Enhancement’ Open
View article: America the Divisible:  Local Taxes and the SALT Subsidy
America the Divisible: Local Taxes and the SALT Subsidy Open
View article: Simultaneous Improvement in Building Energy Efficiency and Indoor Air Quality with Smart Demand Controlled Ventilation
Simultaneous Improvement in Building Energy Efficiency and Indoor Air Quality with Smart Demand Controlled Ventilation Open
View article: Electronic excitation in manganese(II) chlorides MnCl<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si7.svg" display="inline" id="d1e736"><mml:msubsup><mml:mrow/><mml:mrow><mml:mi>n</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>n</mml:mi></mml:mrow></mml:msubsup></mml:math> for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si8.svg" display="inline" id="d1e751"><mml:mi>n</mml:mi></mml:math> = 1..3
Electronic excitation in manganese(II) chlorides MnCl for = 1..3 Open
View article: Assessment of human exposure to particle-associated organic pollutants in home environments of Lisbon, Portugal
Assessment of human exposure to particle-associated organic pollutants in home environments of Lisbon, Portugal Open
View article: Photocatalytic Chlorine Production from Iron Chlorides in Atmospheric Aerosols: Strategies for Quantifying Methane and Tropospheric Ozone Control
Photocatalytic Chlorine Production from Iron Chlorides in Atmospheric Aerosols: Strategies for Quantifying Methane and Tropospheric Ozone Control Open
It was recently discovered that chlorine is produced photocatalytically from mineral dust sea spray aerosols, impacting methane and tropospheric ozone, and an evaluation was made of the climate and environmental impact of a chlorine-based …
View article: Catalytic efficiencies for atmospheric methane removal in the high-chlorine regime
Catalytic efficiencies for atmospheric methane removal in the high-chlorine regime Open
Catalytic production of chlorine atoms from iron salt aerosols (ISA) has been suggested as a means of achieving atmospheric methane reduction (AMR). The feasibility of this approach its efficiency and the optimum conditions for deployment …
View article: Extreme Isotopic Fractionation in CO and H2 Formed in Formaldehyde Photolysis; Theory and Experiment
Extreme Isotopic Fractionation in CO and H2 Formed in Formaldehyde Photolysis; Theory and Experiment Open
Formaldehyde is a common intermediate in reactions of atmospheric organic compounds, it is the most abundant atmospheric carbonyl, and its degradation is a large source of CO and H2. Isotopic analysis is valuable for characterizing molecul…
View article: Extreme Isotopic Fractionation in CO and H2 Formed in Formaldehyde Photolysis; Theory and Experiment
Extreme Isotopic Fractionation in CO and H2 Formed in Formaldehyde Photolysis; Theory and Experiment Open
Formaldehyde is a common intermediate in reactions of atmospheric organic compounds, it is the most abundant atmospheric carbonyl, and its degradation is a large source of CO and H2. Isotopic analysis is valuable for characterizing molecul…
View article: Impact of Sensor Placement on Indoor Air Quality Monitoring: A Comparative Analysis
Impact of Sensor Placement on Indoor Air Quality Monitoring: A Comparative Analysis Open
This study investigates the impact of sensor placement on the accuracy and responsiveness of indoor air quality (IAQ) monitoring focusing on particulate matter concentrations. Measurements were conducted in a controlled environment using t…
View article: Physical and practical constraints on atmospheric methane removal technologies
Physical and practical constraints on atmospheric methane removal technologies Open
Despite their apparent utility in mitigating climate change, technologies for removing methane from air are in early stages of development. Here we evaluate the limiting physical constraints, for three types of systems: two- and three-dime…
View article: Growth and longevity of two imperilled mussel species from the Edwards Plateau of Central Texas and its implications for freshwater mussel conservation and management
Growth and longevity of two imperilled mussel species from the Edwards Plateau of Central Texas and its implications for freshwater mussel conservation and management Open
Life history information such as growth and longevity have been useful for understanding evolutionary relationships and predicting species responses to management and habitat alteration for aquatic species. For unionid mussels, which are g…
View article: Supplementary material to "Feasibility of robust estimates of ozone production rates using satellite observations"
Supplementary material to "Feasibility of robust estimates of ozone production rates using satellite observations" Open
View article: Feasibility of robust estimates of ozone production rates using satellite observations
Feasibility of robust estimates of ozone production rates using satellite observations Open
Ozone pollution is secondarily produced through a complex, non-linear chemical process. Our understanding of the spatiotemporal variations in photochemically produced ozone (i.e., PO3) is limited to sparse aircraft campaigns and chemical t…
View article: The reduced net carbon uptake over Northern Hemisphere land causes the close-to-normal CO <sub>2</sub> growth rate in 2021 La Niña
The reduced net carbon uptake over Northern Hemisphere land causes the close-to-normal CO <sub>2</sub> growth rate in 2021 La Niña Open
La Niña climate anomalies have historically been associated with substantial reductions in the atmospheric CO 2 growth rate. However, the 2021 La Niña exhibited a unique near-neutral impact on the CO 2 growth rate. In this study, we invest…
View article: Opinion: A research roadmap for exploring atmospheric methane removal via iron salt aerosol
Opinion: A research roadmap for exploring atmospheric methane removal via iron salt aerosol Open
The escalating climate crisis requires rapid action to reduce the concentrations of atmospheric greenhouse gases and lower global surface temperatures. Methane will play a critical role in near-term warming due to its high radiative forcin…
View article: Synthesis of 13C-depleted organic matter from CO in a reducing early Martian atmosphere
Synthesis of 13C-depleted organic matter from CO in a reducing early Martian atmosphere Open
Organic matter found in early Martian sediment may yield clues to the planet’s environmental conditions, prebiotic chemistry and habitability, but its origin remains unclear. Strong 13 C depletion in sedimentary organic matter at Gale crat…
View article: Hyperlocal Air Pollution in London: Validating Low-Cost Sensors for Mobile Measurements from Vehicles
Hyperlocal Air Pollution in London: Validating Low-Cost Sensors for Mobile Measurements from Vehicles Open
This study assesses low-cost sensors (LCS) for the mobile monitoring of air quality, which has thus far been scarcely investigated. NO2 and PM2.5 were measured using LCS and higher-grade instruments while driving across various environment…
View article: The use of δ <sup>13</sup>C in CO to determine removal of CH<sub>4</sub> by Cl radicals in the atmosphere <sup>*</sup>
The use of δ <sup>13</sup>C in CO to determine removal of CH<sub>4</sub> by Cl radicals in the atmosphere <sup>*</sup> Open
The reaction of CH 4 with chlorine (Cl) radicals in the atmosphere is associated with an extraordinarily strong isotopic fractionation, where 12 CH 4 reacts about 70 ‰ faster with Cl than 13 CH 4 . Therefore, although the Cl-based sink of …
View article: Evaluating the potential of iron-based interventions in methane reduction and climate mitigation
Evaluating the potential of iron-based interventions in methane reduction and climate mitigation Open
Keeping global surface temperatures below international climate targets will require substantial measures to control atmospheric CO 2 and CH 4 concentrations. Recent studies have focused on interventions to decrease CH 4 through enhanced a…