Ryan Thalman
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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: Development and Testing of a Rocket-Based Sensor for Atmospheric Sensing Using an Unmanned Aerial System
Development and Testing of a Rocket-Based Sensor for Atmospheric Sensing Using an Unmanned Aerial System Open
Measurements of the vertical structure of the lower atmosphere are important to the understanding of air quality. Unmanned Aerial Systems (UASs, drones) can provide low cost, repeatable measurements of the temperature, pressure, and relati…
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: Laboratory Performance Evaluation of a Low-Cost Electrochemical Formaldehyde Sensor
Laboratory Performance Evaluation of a Low-Cost Electrochemical Formaldehyde Sensor Open
Formaldehyde is a known human carcinogen and an important indoor and outdoor air pollutant. However, current strategies for formaldehyde measurement, such as chromatographic and optical techniques, are expensive and labor intensive. Low-co…
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: Comment on amt-2021-172
Comment on amt-2021-172 Open
Abstract. Sulfur dioxide (SO2) is an important precursor for formation of atmospheric sulfate aerosol and acid rain. We present an instrument using Broad Band Cavity Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of SO2 with…
View article: Comment on amt-2021-172
Comment on amt-2021-172 Open
Sulfur dioxide (SO2) is an important precursor for formation of atmospheric sulfate aerosol and acid rain. We present an instrument using Broad Band Cavity Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of SO2 with a minimum…
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 formation of atmospheric sulfate aerosol and acid rain. We present an instrument using Broad Band Cavity Enhanced Absorption Spectroscopy (BBCEAS) for the measurement of SO2 with a minimum…
View article: Sources of Formaldehyde in Bountiful, Utah
Sources of Formaldehyde in Bountiful, Utah Open
The U.S Environmental Protection Agency’s National Air Toxics Trends Stations Network has been measuring the concentration of hazardous air pollutants (HAPs) including formaldehyde (HCHO) since 2003. Bountiful, Utah (USA) has served as one…
View article: Influence of urban pollution on the production of organic particulate matter from isoprene epoxydiols in central Amazonia
Influence of urban pollution on the production of organic particulate matter from isoprene epoxydiols in central Amazonia Open
The atmospheric chemistry of isoprene contributes to the production of a substantial mass fraction of the particulate matter (PM) over tropical forests. Isoprene epoxydiols (IEPOX) produced in the gas phase by the oxidation of isoprene und…
View article: Data for: Update of the HITRAN collision-induced absorption section
Data for: Update of the HITRAN collision-induced absorption section Open
Supplementary materials for Karman et al "Update of the HITRAN collision-induced absorption section" Icarus (2018) 1. This readme file 1. The tar file containing the Main and Aletrnate folders. Only data that is updated or new with respect…
View article: Cloud droplet activation of secondary organic aerosol is mainly controlled by molecular weight, not water solubility
Cloud droplet activation of secondary organic aerosol is mainly controlled by molecular weight, not water solubility Open
Aerosol particles strongly influence global climate by modifying the properties of clouds. An accurate assessment of the aerosol impact on climate requires knowledge of the concentration of cloud condensation nuclei (CCN), a subset of aero…
View article: Urban influence on the concentration and composition of submicron particulate matter in central Amazonia
Urban influence on the concentration and composition of submicron particulate matter in central Amazonia Open
An understanding of how anthropogenic emissions affect the concentrations and composition of airborne particulate matter (PM) is fundamental to quantifying the influence of human activities on climate and air quality. The central Amazon Ba…
View article: Supplementary material to "Cloud droplet activation of secondary organic aerosol is mainly controlled by molecular weight, not water solubility"
Supplementary material to "Cloud droplet activation of secondary organic aerosol is mainly controlled by molecular weight, not water solubility" Open
Experiments were conducted in
View article: Cloud droplet activation of secondary organic aerosol is mainly controlled by molecular weight, not water solubility
Cloud droplet activation of secondary organic aerosol is mainly controlled by molecular weight, not water solubility Open
Aerosol particles strongly influence global climate by modifying the properties of clouds. An accurate assessment of the aerosol impact on climate requires knowledge of the concentration of cloud condensation nuclei (CCN), a subset of aero…
View article: Long-term observations of cloud condensation nuclei over the Amazon rain forest – Part 2: Variability and characteristics of biomass burning, long-range transport, and pristine rain forest aerosols
Long-term observations of cloud condensation nuclei over the Amazon rain forest – Part 2: Variability and characteristics of biomass burning, long-range transport, and pristine rain forest aerosols Open
Size-resolved measurements of atmospheric aerosol and cloud condensation nuclei (CCN) concentrations and hygroscopicity were conducted over a full seasonal cycle at the remote Amazon Tall Tower Observatory (ATTO, March 2014–February 2015).…
View article: The Green Ocean: precipitation insights from the GoAmazon2014/5 experiment
The Green Ocean: precipitation insights from the GoAmazon2014/5 experiment Open
This study summarizes the precipitation properties collected during the GoAmazon2014/5 campaign near Manaus in central Amazonia, Brazil. Precipitation breakdowns, summary radar rainfall relationships and self-consistency concepts from a co…
View article: Overview: Precipitation characteristics and sensitivities to environmental conditions during GoAmazon2014/5 and ACRIDICON-CHUVA
Overview: Precipitation characteristics and sensitivities to environmental conditions during GoAmazon2014/5 and ACRIDICON-CHUVA Open
This study provides an overview of precipitation processes and their sensitivities to environmental conditions in the Central Amazon Basin near Manaus during the GoAmazon2014/5 and ACRIDICON-CHUVA experiments. This study takes advantage of…
View article: Urban influence on the concentration and composition of submicron particulate matter in central Amazonia
Urban influence on the concentration and composition of submicron particulate matter in central Amazonia Open
Fundamental to quantifying the influence of human activities on climate and air quality is an understanding of how anthropogenic emissions affect the concentrations and composition of airborne particulate matter (PM). The central Amazon ba…
View article: The Green Ocean: Precipitation Insights from the GoAmazon2014/5 Experiment
The Green Ocean: Precipitation Insights from the GoAmazon2014/5 Experiment Open
This study summarizes the precipitation properties collected during the GoAmazon2014/5 campaign near Manaus in central Amazonia, Brazil. Precipitation breakdowns, summary radar rainfall relationships and self-consistency concepts from a co…
View article: Chemistry of Volatile Organic Compounds in the Los Angeles Basin: Formation of Oxygenated Compounds and Determination of Emission Ratios
Chemistry of Volatile Organic Compounds in the Los Angeles Basin: Formation of Oxygenated Compounds and Determination of Emission Ratios Open
We analyze an expanded data set of oxygenated volatile organic compounds (OVOCs) in air measured by several instruments at a surface site in Pasadena near Los Angeles during the National Oceanic and Atmospheric Administration California Ne…
View article: Secondary organic aerosol formation from ambient air in an oxidation flow reactor in central Amazonia
Secondary organic aerosol formation from ambient air in an oxidation flow reactor in central Amazonia Open
Secondary organic aerosol (SOA) formation from ambient air was studied using an oxidation flow reactor (OFR) coupled to an aerosol mass spectrometer (AMS) during both the wet and dry seasons at the Observations and Modeling of the Green Oc…
View article: Overview: Precipitation Characteristics and Sensitivities to the Environmental Conditions during GoAmazon2014/5 and ACRIDICON-CHUVA
Overview: Precipitation Characteristics and Sensitivities to the Environmental Conditions during GoAmazon2014/5 and ACRIDICON-CHUVA Open
Abstract. This is study provides an overview of precipitation processes and their sensitivities to environmental conditions, in the Central Amazon Basin, during the GoAmazon2014/5 and ACRIDICON-CHUVA experiments. Taking advantage of the nu…
View article: Long-term observations of cloud condensation nuclei in the Amazon rain forest – Part 2: Variability and characteristic differences under near-pristine, biomass burning, and long-range transport conditions
Long-term observations of cloud condensation nuclei in the Amazon rain forest – Part 2: Variability and characteristic differences under near-pristine, biomass burning, and long-range transport conditions Open
Size-resolved measurements of atmospheric aerosol and cloud condensation nuclei (CCN) concentrations and hygroscopicity were conducted at the remote Amazon Tall Tower Observatory (ATTO) in the central Amazon Basin over a full seasonal cycl…