Hannah S. Halliday
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View article: Trace Organic Gas Analyzer Time-of-Flight mass spectrometer (TOGA-TOF) system for airborne observations of formaldehyde
Trace Organic Gas Analyzer Time-of-Flight mass spectrometer (TOGA-TOF) system for airborne observations of formaldehyde Open
Formaldehyde (HCHO) is a ubiquitous atmospheric constituent, originating from primary emissions (natural and anthropogenic) and secondary production via the oxidation of volatile organic compounds (VOCs). In addition to being a regulated p…
View article: Supplementary material to "Trace Organic Gas Analyzer Time-of-Flight mass spectrometer (TOGA-TOF) system for airborne observations of formaldehyde"
Supplementary material to "Trace Organic Gas Analyzer Time-of-Flight mass spectrometer (TOGA-TOF) system for airborne observations of formaldehyde" Open
View article: Age of smoke sampled by aircraft during FIREX-AQ: methods and critical evaluation
Age of smoke sampled by aircraft during FIREX-AQ: methods and critical evaluation Open
The age of smoke, meaning the time elapsed since it was produced in a fire, is an important parameter for interpreting measurements of evolving smoke composition. This study describes the smoke age estimates developed for large plumes samp…
View article: Evolution of Reactive Organic Compounds and Their Potential Health Risk in Wildfire Smoke
Evolution of Reactive Organic Compounds and Their Potential Health Risk in Wildfire Smoke Open
Wildfires are an increasing source of emissions into the air, with health effects modulated by the abundance and toxicity of individual species. In this work, we estimate reactive organic compounds (ROC) in western U.S. wildland forest fir…
View article: Airborne Observations Constrain Heterogeneous Nitrogen and Halogen Chemistry on Tropospheric and Stratospheric Biomass Burning Aerosol
Airborne Observations Constrain Heterogeneous Nitrogen and Halogen Chemistry on Tropospheric and Stratospheric Biomass Burning Aerosol Open
Heterogeneous chemical cycles of pyrogenic nitrogen and halides influence tropospheric ozone and affect the stratosphere during extreme Pyrocumulonimbus (PyroCB) events. We report field‐derived N 2 O 5 uptake coefficients, γ (N 2 O 5 ), an…
View article: Parameterizations of US wildfire and prescribed fire emission ratios and emission factors based on FIREX-AQ aircraft measurements
Parameterizations of US wildfire and prescribed fire emission ratios and emission factors based on FIREX-AQ aircraft measurements Open
Extensive airborne measurements of non-methane organic gases (NMOGs), methane, nitrogen oxides, reduced nitrogen species, and aerosol emissions from US wild and prescribed fires were conducted during the 2019 NOAA/NASA Fire Influence on Re…
View article: Airborne Observations Constrain Heterogeneous Nitrogen and Halogen Chemistry on Tropospheric and Stratospheric Biomass Burning Aerosol
Airborne Observations Constrain Heterogeneous Nitrogen and Halogen Chemistry on Tropospheric and Stratospheric Biomass Burning Aerosol Open
Heterogeneous chemical cycles of pyrogenic nitrogen and halides influence tropospheric ozone and affect the stratosphere during extreme pyrocumulonimbus (PyroCB) events. We report field-derived N2O5 uptake coefficients, γ(N2O5), and ClNO2 …
View article: Emission Factors for Crop Residue and Prescribed Fires in the Eastern US During FIREX‐AQ
Emission Factors for Crop Residue and Prescribed Fires in the Eastern US During FIREX‐AQ Open
Agricultural and prescribed burning activities emit large amounts of trace gases and aerosols on regional to global scales. We present a compilation of emission factors (EFs) and emission ratios from the eastern portion of the Fire Influen…
View article: Comment on egusphere-2023-1439
Comment on egusphere-2023-1439 Open
Abstract. Extensive airborne measurements of non-methane organic gases (NMOGs), methane, nitrogen oxides, reduced nitrogen-species, and aerosol emissions from US wild and prescribed fires were conducted during the 2019 NOA…
View article: Parameterizations of US wildfire and prescribed fire emission ratios and emission factors based on FIREX-AQ aircraft measurements
Parameterizations of US wildfire and prescribed fire emission ratios and emission factors based on FIREX-AQ aircraft measurements Open
Extensive airborne measurements of non-methane organic gases (NMOGs), methane, nitrogen oxides, reduced nitrogen-species, and aerosol emissions from US wild and prescribed fires were conducted during the 2019 NOAA/NASA Fire Influence on Re…
View article: Characterization of PFAS air emissions from thermal application of fluoropolymer dispersions on fabrics
Characterization of PFAS air emissions from thermal application of fluoropolymer dispersions on fabrics Open
During thermal processes utilized in affixing fluoropolymer coatings dispersion to fibers and fabrics, coating components are vaporized. It is suspected that per- and polyfluoroalkyl substances (PFAS) from the dispersions may undergo chemi…
View article: Measurement report: Emission factors of NH <sub>3</sub> and NH <sub> <i>x</i> </sub> for wildfires and agricultural fires in the United States
Measurement report: Emission factors of NH <sub>3</sub> and NH <sub> <i>x</i> </sub> for wildfires and agricultural fires in the United States Open
During the 2019 Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) study, the NASA DC-8 carried out in situ chemical measurements in smoke plumes emitted from wildfires and agricultural fires in the contiguous Uni…
View article: Comment on egusphere-2022-879
Comment on egusphere-2022-879 Open
Abstract. During the 2019 Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) study, the NASA DC-8 carried out in situ chemical measurements in smoke plumes emitted from wildfires and agri…
View article: Emission factors and evolution of SO <sub>2</sub> measured from biomass burning in wildfires and agricultural fires
Emission factors and evolution of SO <sub>2</sub> measured from biomass burning in wildfires and agricultural fires Open
Fires emit sufficient sulfur to affect local and regional air quality and climate. This study analyzes SO2 emission factors and variability in smoke plumes from US wildfires and agricultural fires, as well as their relationship to sulfate …
View article: Supplementary material to "Measurement report: Emission factors of NH <sub>3</sub> and NH <sub>x</sub> for wildfires and agricultural fires in the United States"
Supplementary material to "Measurement report: Emission factors of NH <sub>3</sub> and NH <sub>x</sub> for wildfires and agricultural fires in the United States" Open
View article: Impact of <scp>do‐it‐yourself</scp> air cleaner design on the reduction of simulated wildfire smoke in a controlled chamber environment
Impact of <span>do‐it‐yourself</span> air cleaner design on the reduction of simulated wildfire smoke in a controlled chamber environment Open
During wildfire smoke events public health agencies release advisories to stay indoors, close doors and windows, and operate a portable air cleaner (PAC). The do-it-yourself (DIY) air cleaner consisting of a box fan and a furnace filter is…
View article: Measurement report: Emission factors of NH <sub>3</sub> and NH <sub>x</sub> for wildfires and agricultural fires in the United States
Measurement report: Emission factors of NH <sub>3</sub> and NH <sub>x</sub> for wildfires and agricultural fires in the United States Open
During the 2019 Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) study, the NASA DC-8 carried out in situ chemical measurements in smoke plumes emitted from wildfires and agricultural fires in the contiguous US.…
View article: Fuel layer specific pollutant emission factors for fire prone forest ecosystems of the western U.S. and Canada
Fuel layer specific pollutant emission factors for fire prone forest ecosystems of the western U.S. and Canada Open
View article: Comparison of airborne measurements of NO, NO <sub>2</sub> , HONO, NO <sub> <i>y</i> </sub> , and CO during FIREX-AQ
Comparison of airborne measurements of NO, NO <sub>2</sub> , HONO, NO <sub> <i>y</i> </sub> , and CO during FIREX-AQ Open
We present a comparison of fast-response instruments installed onboard the NASA DC-8 aircraft that measured nitrogen oxides (NO and NO2), nitrous acid (HONO), total reactive odd nitrogen (measured both as the total (NOy) and from the sum o…
View article: Comment on acp-2022-309
Comment on acp-2022-309 Open
Abstract. Fires emit sufficient sulfur to affect local and regional air quality and climate. This study analyzes SO2 emission factors and variability in smoke plumes from US wild and agricultural fires, and thei…
View article: Comment on acp-2022-309 Please check rate constant
Comment on acp-2022-309 Please check rate constant Open
Fires emit sufficient sulfur to affect local and regional air quality and climate. This study analyzes SO2 emission factors and variability in smoke plumes from US wild and agricultural fires, and their relationship to sulfate and hydroxym…
View article: Supplementary material to "Emission factors and evolution of SO <sub>2</sub> measured from biomass burning in wild and agricultural fires"
Supplementary material to "Emission factors and evolution of SO <sub>2</sub> measured from biomass burning in wild and agricultural fires" Open
View article: Emission factors and evolution of SO <sub>2</sub> measured from biomass burning in wild and agricultural fires
Emission factors and evolution of SO <sub>2</sub> measured from biomass burning in wild and agricultural fires Open
Fires emit sufficient sulfur to affect local and regional air quality and climate. This study analyzes SO2 emission factors and variability in smoke plumes from US wild and agricultural fires, and their relationship to sulfate and hydroxym…
View article: Comment on amt-2021-432
Comment on amt-2021-432 Open
We present a comparison of fast-response instruments installed onboard the NASA DC-8 aircraft that measured nitrogen oxides (NO and NO2), nitrous acid (HONO), total reactive odd nitrogen (measured both as the total (NOy) and from the sum o…
View article: Comment on amt-2021-432
Comment on amt-2021-432 Open
Abstract. We present a comparison of fast-response instruments installed onboard the NASA DC-8 aircraft that measured nitrogen oxides (NO and NO2), nitrous acid (HONO), total reactive odd nitrogen (…
View article: Measurements from inside a Thunderstorm Driven by Wildfire: The 2019 FIREX-AQ Field Experiment
Measurements from inside a Thunderstorm Driven by Wildfire: The 2019 FIREX-AQ Field Experiment Open
The 2019 Fire Influence on Regional to Global Environments and Air Quality (FIREX-AQ) field experiment obtained a diverse set of in situ and remotely sensed measurements before and during a pyrocumulonimbus (pyroCb) event over the Williams…
View article: Supplementary material to "Comparison of airborne measurements of NO, NO <sub>2</sub> , HONO, NO <sub>y</sub> and CO during FIREX-AQ"
Supplementary material to "Comparison of airborne measurements of NO, NO <sub>2</sub> , HONO, NO <sub>y</sub> and CO during FIREX-AQ" Open
S1. Characterization of aerosol transmission in the CL instrument NOy inletAgreement within stated uncertainties between total NOy measured by CL and SNOy (Figure 9), where pNO3 (including both inorganic and organic fractions) was often a …
View article: Comparison of airborne measurements of NO, NO <sub>2</sub> , HONO, NO <sub>y</sub> and CO during FIREX-AQ
Comparison of airborne measurements of NO, NO <sub>2</sub> , HONO, NO <sub>y</sub> and CO during FIREX-AQ Open
We present a comparison of fast-response instruments installed onboard the NASA DC-8 aircraft that measured nitrogen oxides (NO and NO2), nitrous acid (HONO), total reactive odd nitrogen (measured both as the total (NOy) and from the sum o…
View article: Formaldehyde evolution in US wildfire plumes during the Fire Influence on Regional to Global Environments and Air Quality experiment (FIREX-AQ)
Formaldehyde evolution in US wildfire plumes during the Fire Influence on Regional to Global Environments and Air Quality experiment (FIREX-AQ) Open
Formaldehyde (HCHO) is one of the most abundant non-methane volatile organic compounds (VOCs) emitted by fires. HCHO also undergoes chemical production and loss as a fire plume ages, and it can be an important oxidant precursor. In this st…
View article: Ozone chemistry in western U.S. wildfire plumes
Ozone chemistry in western U.S. wildfire plumes Open
While ozone increases rapidly in wildfire plumes, downwind its production rate slows dramatically as nitrogen oxide levels decline.