Callum E. Flowerday
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View article: High-purity nitrous acid (HONO) generation and quantification using broadband cavity-enhanced absorption spectroscopy (BBCEAS)
High-purity nitrous acid (HONO) generation and quantification using broadband cavity-enhanced absorption spectroscopy (BBCEAS) Open
Nitrous acid (HONO) is a key atmospheric precursor to hydroxyl radicals (OH), which drive oxidation processes in the troposphere. Accurate quantification of HONO is essential for modelling atmospheric chemistry but is often challenging due…
View article: Open Path Spectroscopic Detection of Hydroxyl Radical: A Comparison between Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) and BBCEAS Coupled with a Fabry–Pérot Interferometer (BBCEAS-FP)
Open Path Spectroscopic Detection of Hydroxyl Radical: A Comparison between Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) and BBCEAS Coupled with a Fabry–Pérot Interferometer (BBCEAS-FP) Open
Hydroxyl radical (OH) is the primary atmospheric oxidant, but it is challenging to measure due to its short half-life under atmospheric conditions (approximately 1 s) and low ambient concentrations (approximately 106 molecules/cm3). While …
View article: Historical Analysis of Urban Dust Generated by the Great Salt Lake Playa
Historical Analysis of Urban Dust Generated by the Great Salt Lake Playa Open
The Great Salt Lake (GSL) has undergone a reduction in size, from 1046.0 miles2 on January 1, 2015, to 940.5 miles2 on January 1, 2022, exposing 105.5 miles2 of playa that was once covered. This emerging playa raises concerns regarding the…
View article: OH Radical Detection Using Broadband Cavity Enhanced Absorption Spectroscopy (BBCEAS) in an Open-Path Configuration
OH Radical Detection Using Broadband Cavity Enhanced Absorption Spectroscopy (BBCEAS) in an Open-Path Configuration Open
Hydroxyl radical (OH) is a pivotal oxidant in the atmosphere, exerting significant influence on atmospheric chemistry and participating in diverse environmental processes. However, accurately measuring OH in the atmosphere is challenging d…
View article: Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) Coupled with an Interferometer for On-Band and Off-Band Detection of Glyoxal
Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) Coupled with an Interferometer for On-Band and Off-Band Detection of Glyoxal Open
Glyoxal (CHOCHO) is a trace gas in the atmosphere, often used as an indicator of biogenic emissions. It is frequently compared to formaldehyde concentrations, which serve as indicators of anthropogenic emissions, to gain insights into the …
View article: Twenty-Year Review of Outdoor Air Quality in Utah, USA
Twenty-Year Review of Outdoor Air Quality in Utah, USA Open
Air quality is a prevalent concern due to its imposing health risks. The state of Utah, USA, at times over the last 20 years has suffered from some of the worst air quality in the nation. The propensity for the state of Utah to experience …
View article: Utilizing Low-Cost Sensors to Monitor Indoor Air Quality in Mongolian Gers
Utilizing Low-Cost Sensors to Monitor Indoor Air Quality in Mongolian Gers Open
Air quality has important climate and health effects. There is a need, therefore, to monitor air quality both indoors and outdoors. Methods of measuring air quality should be cost-effective if they are to be used widely, and one such metho…
View article: Local and Regional Contributions to Tropospheric Ozone Concentrations
Local and Regional Contributions to Tropospheric Ozone Concentrations Open
The Wasatch Front in Utah, USA is currently a non-attainment area for ozone according to the Environmental Protection Agency’s (EPA) National Ambient Air Quality Standards (NAAQS). Nitrogen oxides (NOx = NO2 + NO) and volatile organic comp…
View article: Absorption cross-sections for the 5th and 6th vibrational overtones in a series of short chained alcohols using incoherent broadband cavity enhanced-absorption spectroscopy (IBBCEAS)
Absorption cross-sections for the 5th and 6th vibrational overtones in a series of short chained alcohols using incoherent broadband cavity enhanced-absorption spectroscopy (IBBCEAS) Open
Absorption cross-sections for the 5th (6 $\\leftarrow$ 0) and 6th (7\n$\\leftarrow$ 0) OH overtones for gas-phase methanol, ethanol, and isopropanol\nwere measured using a slow flow cell and Incoherent Broadband Cavity-Enhanced\nAbsorption…
View article: Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS)
Detection of Sulfur Dioxide by Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) Open
Sulfur dioxide (SO2) is an important precursor for the formation of atmospheric sulfate aerosol and acid rain. We present an instrument using Broadband Cavity-Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of SO2 with a mini…
View article: Enhanced Fluorescence in a Scattering Medium
Enhanced Fluorescence in a Scattering Medium Open
Often only small amounts of sample are available for spectroscopic analytical determinations. This work investigates the enhancement of signal in columns packed with silica particles. We propose that silica particles cause the light to sca…