Thomas B. Ryerson
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View article: A nitrate photolysis source of tropospheric HONO is incompatible with current understanding of atmospheric chemistry
A nitrate photolysis source of tropospheric HONO is incompatible with current understanding of atmospheric chemistry Open
Recent observations of nitrous acid (HONO) in the remote troposphere show much higher concentrations than can be explained through known sources, with important implications for air quality and climate. Laboratory evidence and modelling of…
View article: Enhancement of O <sub>3</sub> –CO ratios at tropospheric subtropical latitudes: Photochemistry and stratospheric influence
Enhancement of O <sub>3</sub> –CO ratios at tropospheric subtropical latitudes: Photochemistry and stratospheric influence Open
The subtropics are influenced by stratosphere-troposphere exchange processes through the subtropical jet streams and tropopause folding events, which are commonly identified by the opposing gradients of ozone (O3) and carbon monoxide (CO) …
View article: Observational ozone datasets over the global oceans and polar regions (version 2024)
Observational ozone datasets over the global oceans and polar regions (version 2024) Open
Studying tropospheric ozone over the remote areas of the planet, such as the open oceans and the polar regions, is crucial to understand the role of ozone as a global climate forcer and regulator of atmospheric oxidative capacity. A focus …
View article: Global Observations of Acetyl Peroxynitrate (PAN) in the Remote Troposphere
Global Observations of Acetyl Peroxynitrate (PAN) in the Remote Troposphere Open
We present global airborne observations of acetyl peroxynitrate (CH 3 C(O)OONO 2 , PAN) in the remote troposphere from the Atmospheric Tomography (ATom) campaign. These observations show that biomass burning is the dominant source of PAN i…
View article: Enhancement of O₃–CO ratios at tropospheric subtropical latitudes: Photochemistry and stratospheric influence
Enhancement of O₃–CO ratios at tropospheric subtropical latitudes: Photochemistry and stratospheric influence Open
The subtropics are influenced by stratosphere-troposphere exchange processes through the subtropical jet streams and tropopause folding events, which are commonly identified by the opposing gradients of ozone (O3) and carbon monoxide (CO) …
View article: Supplementary material to "Enhancement of O₃–CO ratios at tropospheric subtropical latitudes: Photochemistry and stratospheric influence"
Supplementary material to "Enhancement of O₃–CO ratios at tropospheric subtropical latitudes: Photochemistry and stratospheric influence" Open
View article: Observations of tropospheric HONO are incompatible with understanding of atmospheric chemistry
Observations of tropospheric HONO are incompatible with understanding of atmospheric chemistry Open
Recent observations of nitrous acid (HONO) in the remote troposphere found much higher concentrations than can be explained through known sources, with important implications for air quality and climate. Laboratory evidence and modelling o…
View article: Supplementary material to "Observations of tropospheric HONO are incompatible with understanding of atmospheric chemistry"
Supplementary material to "Observations of tropospheric HONO are incompatible with understanding of atmospheric chemistry" Open
View article: Observational ozone data over the global oceans and polar regions: The TOAR-II Oceans data set version 2024
Observational ozone data over the global oceans and polar regions: The TOAR-II Oceans data set version 2024 Open
Studying tropospheric ozone over the remote areas of the planet, such as the open oceans and the polar regions, is crucial to understand the role of ozone as a global climate forcer and regulator of atmospheric oxidative capacity. A focus …
View article: Widespread trace bromine and iodine in remote tropospheric non-sea-salt aerosols
Widespread trace bromine and iodine in remote tropospheric non-sea-salt aerosols Open
Reactive halogens catalytically destroy O3 and therefore affect (1) stratospheric O3 depletion and (2) the oxidative capacity of the troposphere. Reactive halogens also partition into the aerosol phase, but what governs halogen-aerosol par…
View article: Tropical tropospheric ozone distribution and trends from in situ and satellite data
Tropical tropospheric ozone distribution and trends from in situ and satellite data Open
Tropical tropospheric ozone (TTO) is important for the global radiation budget because the longwave radiative effect of tropospheric ozone is higher in the tropics than midlatitudes. In recent decades the TTO burden has increased, partly d…
View article: Comment on egusphere-2023-3095
Comment on egusphere-2023-3095 Open
Abstract. Tropical tropospheric ozone (TTO) is important for the global radiation budget because the longwave radiative effect of tropospheric ozone is higher in the tropics than mid-latitudes. In recent decades the TTO bu…
View article: Comment on egusphere-2023-3095
Comment on egusphere-2023-3095 Open
Abstract. Tropical tropospheric ozone (TTO) is important for the global radiation budget because the longwave radiative effect of tropospheric ozone is higher in the tropics than mid-latitudes. In recent decades the TTO bu…
View article: Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O <sub>3</sub> destruction
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O <sub>3</sub> destruction Open
Bromine activation (the production of Br in an elevated oxidation state) promotes ozone destruction and mercury removal in the global troposphere and commonly occurs in both springtime polar boundary layers, often accompanied by nearly com…
View article: O3 formation sensitivity to precursors and lightning in the tropical troposphere based on airborne observations
O3 formation sensitivity to precursors and lightning in the tropical troposphere based on airborne observations Open
Tropospheric ozone (O) is an important greenhouse gas that is also hazardous to human health. O is formed photochemically from nitrogen dioxide (NO) (with oxygen and sunlight), which in turn is generated through oxidation of nitric oxide (…
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: Supplementary material to "Tropical tropospheric ozone distribution and trends from in situ and satellite data"
Supplementary material to "Tropical tropospheric ozone distribution and trends from in situ and satellite data" Open
View article: Tropical tropospheric ozone distribution and trends from in situ and satellite data
Tropical tropospheric ozone distribution and trends from in situ and satellite data Open
Tropical tropospheric ozone (TTO) is important for the global radiation budget because the longwave radiative effect of tropospheric ozone is higher in the tropics than mid-latitudes. In recent decades the TTO burden has increased, partly …
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: Sources of Formaldehyde in U.S. Oil and Gas Production Regions
Sources of Formaldehyde in U.S. Oil and Gas Production Regions Open
We analyzed observational and model data to study the sources of formaldehyde over oil and gas production regions and to investigate how these observations may be used to constrain oil and gas volatile organic compound (VOC) emissions. The…
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: Comment on egusphere-2023-860
Comment on egusphere-2023-860 Open
Abstract. Active bromine (e.g., Br2, BrCl, BrO, HOBr) promotes atmospheric ozone destruction and mercury removal. Here we report a previously unidentified participant in active-Br chemistry, cyanogen bromide (Br…
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: Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O <sub>3</sub> destruction
Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O <sub>3</sub> destruction Open
Active bromine (e.g., Br2, BrCl, BrO, HOBr) promotes atmospheric ozone destruction and mercury removal. Here we report a previously unidentified participant in active-Br chemistry, cyanogen bromide (BrCN), measured during the NASA Atmosphe…
View article: Supplementary material to "Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O <sub>3</sub> destruction"
Supplementary material to "Observations of cyanogen bromide (BrCN) in the global troposphere and their relation to polar surface O <sub>3</sub> destruction" Open
Supplement to: BrCN in the global troposphere 1 Formation of BrCN from HOBr chemistryThe formation of XCN compounds from reactions of HCN/CN¯ in the condensed phase is well known, so deserves consideration in the context of the polar bound…
View article: Pyrocumulonimbus affect average stratospheric aerosol composition
Pyrocumulonimbus affect average stratospheric aerosol composition Open
Pyrocumulonimbus (pyroCb) are wildfire-generated convective clouds that can inject smoke directly into the stratosphere. PyroCb have been tracked for years, yet their apparent rarity and episodic nature lead to highly uncertain climate imp…
View article: Heterogeneity and chemical reactivity of the remote troposphere defined by aircraft measurements – corrected
Heterogeneity and chemical reactivity of the remote troposphere defined by aircraft measurements – corrected Open
The NASA Atmospheric Tomography (ATom) mission built a photochemical climatology of air parcels based on in situ measurements with the NASA DC-8 aircraft along objectively planned profiling transects through the middle of the Pacific and A…
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: Project Falcon data
Project Falcon data Open
Continuous monitoring data from the 7 upstream production sites instrumented during Project Falcon; two files per site, the first contains the 1-minute-average measured data, and the second contains the 15-minute averaged data and the calc…