Theodore K. Koenig
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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: Modelling Arctic lower-tropospheric ozone: processes controlling seasonal variations
Modelling Arctic lower-tropospheric ozone: processes controlling seasonal variations Open
Previous assessments on modelling Arctic tropospheric ozone (O3) have shown that most atmospheric models continue to experience difficulties in simulating tropospheric O3 in the Arctic, particularly in capturing the seasonal variations at …
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: Modelling Arctic Lower Tropospheric Ozone: processes controlling seasonal variations
Modelling Arctic Lower Tropospheric Ozone: processes controlling seasonal variations Open
Previous assessments on modelling Arctic tropospheric ozone (O3) have shown that most atmospheric models continue to experience difficulties in simulating tropospheric O3 in the Arctic, particularly in capturing the seasonal variations at …
View article: Troposphere–stratosphere-integrated bromine monoxide (BrO) profile retrieval over the central Pacific Ocean
Troposphere–stratosphere-integrated bromine monoxide (BrO) profile retrieval over the central Pacific Ocean Open
Bromine monoxide (BrO) is relevant to atmospheric oxidative capacity, affecting the lifetime of greenhouse gases (i.e., methane, dimethylsulfide) and mercury oxidation. However, measurements of BrO radical vertical profiles are rare, and B…
View article: Major source categories of PM2.5 oxidative potential in wintertime Beijing and surroundings based on online dithiothreitol-based field measurements
Major source categories of PM2.5 oxidative potential in wintertime Beijing and surroundings based on online dithiothreitol-based field measurements Open
Fine particulate matter (PM2.5) causes millions of premature deaths each year worldwide. Oxidative potential (OP) has been proposed as a better metric for aerosol health effects than PM2.5 mass concentration alone. In…
View article: Oxygenated organic molecules produced by low-NO <sub> <i>x</i> </sub> photooxidation of aromatic compounds: contributions to secondary organic aerosol and steric hindrance
Oxygenated organic molecules produced by low-NO <sub> <i>x</i> </sub> photooxidation of aromatic compounds: contributions to secondary organic aerosol and steric hindrance Open
Oxygenated organic molecules (OOMs) produced by the oxidation of aromatic compounds are key components of secondary organic aerosol (SOA) in urban environments. The steric effects of substitutions and rings and the role of key reaction pat…
View article: Global Observations of Tropospheric Bromine Monoxide (BrO) Columns From TROPOMI
Global Observations of Tropospheric Bromine Monoxide (BrO) Columns From TROPOMI Open
Bromine monoxide (BrO) plays an important role in tropospheric chemistry. The state‐of‐the‐science TROPOspheric Monitoring Instrument (TROPOMI) offers the potential to monitor atmospheric composition with a fine spatial resolution of up to…
View article: Comment on egusphere-2023-2150
Comment on egusphere-2023-2150 Open
Abstract. Bromine is a reactive trace element in the atmosphere, that destroys ozone, oxidizes mercury, modifies oxidative capacity and affects the lifetime of climate-active gases (e.g., methane). About 75 % of tropospher…
View article: Troposphere – stratosphere integrated BrO profile retrieval over the central Pacific Ocean
Troposphere – stratosphere integrated BrO profile retrieval over the central Pacific Ocean Open
Bromine is a reactive trace element in the atmosphere, that destroys ozone, oxidizes mercury, modifies oxidative capacity and affects the lifetime of climate-active gases (e.g., methane). About 75 % of tropospheric ozone and methane is des…
View article: Supplementary material to "Troposphere – stratosphere integrated BrO profile retrieval over the central Pacific Ocean"
Supplementary material to "Troposphere – stratosphere integrated BrO profile retrieval over the central Pacific Ocean" Open
View article: Comment on egusphere-2023-1215
Comment on egusphere-2023-1215 Open
Abstract. Oxygenated organic molecules (OOMs) produced by the oxidation of aromatic compounds are key components of secondary organic aerosol (SOA) in urban environments. The steric effects of substitutions and rings and t…
View article: Troposphere - stratosphere integrated BrO profile retrieval over the central Pacific Ocean
Troposphere - stratosphere integrated BrO profile retrieval over the central Pacific Ocean Open
Data are reported in Troposphere - stratosphere integrated BrO profile retrieval over the central Pacific Ocean by Koenig et. al, 2023 in preparation. File names are descriptive. In brief, they are: 1) Average twilight dSCDs for sensitivit…
View article: Troposphere - stratosphere integrated BrO profile retrieval over the central Pacific Ocean
Troposphere - stratosphere integrated BrO profile retrieval over the central Pacific Ocean Open
Data are reported in Troposphere - stratosphere integrated BrO profile retrieval over the central Pacific Ocean by Koenig et. al, 2023 in preparation. File names are descriptive. In brief, they are: 1) Average twilight dSCDs for sensitivit…
View article: Comment on egusphere-2023-1215
Comment on egusphere-2023-1215 Open
Abstract. Oxygenated organic molecules (OOMs) produced by the oxidation of aromatic compounds are key components of secondary organic aerosol (SOA) in urban environments. The steric effects of substitutions and rings and t…
View article: Supplementary material to "Oxygenated organic molecules produced by low-NO <sub>x</sub> photooxidation of aromatic compounds and their contributions to secondary organic aerosol"
Supplementary material to "Oxygenated organic molecules produced by low-NO <sub>x</sub> photooxidation of aromatic compounds and their contributions to secondary organic aerosol" Open
View article: Oxygenated organic molecules produced by low-NO <sub>x</sub> photooxidation of aromatic compounds and their contributions to secondary organic aerosol
Oxygenated organic molecules produced by low-NO <sub>x</sub> photooxidation of aromatic compounds and their contributions to secondary organic aerosol Open
Oxygenated organic molecules (OOMs) produced by the oxidation of aromatic compounds are key components of secondary organic aerosol (SOA) in urban environments. The steric effects of substitutions and rings and the role of key reaction pat…
View article: Observed in-plume gaseous elemental mercury depletion suggests significant mercury scavenging by volcanic aerosols
Observed in-plume gaseous elemental mercury depletion suggests significant mercury scavenging by volcanic aerosols Open
Terrestrial volcanism is known to emit mercury (Hg) into the atmosphere. However, despite many years of investigation, its net impact on the atmospheric Hg budget remains insufficiently constrained, in part because the transformations of H…
View article: O2-O2, SO2, BrO, and IO differential slant column densities (dSCDs) measured by the University of Colorado Multi-AXis Differential Optical Absorption Spectroscopy (CU MAX-DOAS) instrument at Maido Observatory during April 29, 2018 and May 4, 2018
O2-O2, SO2, BrO, and IO differential slant column densities (dSCDs) measured by the University of Colorado Multi-AXis Differential Optical Absorption Spectroscopy (CU MAX-DOAS) instrument at Maido Observatory during April 29, 2018 and May 4, 2018 Open
Description: O2-O2, SO2, BrO, and IO differential slant column densities (dSCDs) measured by the University of Colorado Multi-AXis Differential Optical Absorption Spectroscopy (CU MAX-DOAS) instrument at Ma…
View article: O2-O2, SO2, BrO, and IO differential slant column densities (dSCDs) measured by the University of Colorado Multi-AXis Differential Optical Absorption Spectroscopy (CU MAX-DOAS) instrument at Maido Observatory during April 29, 2018 and May 4, 2018
O2-O2, SO2, BrO, and IO differential slant column densities (dSCDs) measured by the University of Colorado Multi-AXis Differential Optical Absorption Spectroscopy (CU MAX-DOAS) instrument at Maido Observatory during April 29, 2018 and May 4, 2018 Open
Description: O2-O2, SO2, BrO, and IO differential slant column densities (dSCDs) measured by the University of Colorado Multi-AXis Differential Optical Absorption Spectroscopy (CU MAX-DOAS) instrument at Ma…
View article: Observed in-plume gaseous elemental mercury depletion suggests significant mercury scavenging by volcanic aerosols
Observed in-plume gaseous elemental mercury depletion suggests significant mercury scavenging by volcanic aerosols Open
We observed complete GEM depletion in a volcanic plume.
View article: Heterogeneous Reactions Significantly Contribute to the Atmospheric Formation of Nitrated Aromatic Compounds During the Haze Episode in Urban Beijing
Heterogeneous Reactions Significantly Contribute to the Atmospheric Formation of Nitrated Aromatic Compounds During the Haze Episode in Urban Beijing Open
View article: The gas-phase formation mechanism of iodic acid as an atmospheric aerosol source
The gas-phase formation mechanism of iodic acid as an atmospheric aerosol source Open
View article: Ozone depletion due to dust release of iodine in the free troposphere
Ozone depletion due to dust release of iodine in the free troposphere Open
Iodine released from dust destroys ozone and indicates a missing atmospheric process in the geochemical iodine cycle.
View article: Biomass burning nitrogen dioxide emissions derived from space with TROPOMI: methodology and validation
Biomass burning nitrogen dioxide emissions derived from space with TROPOMI: methodology and validation Open
Smoke from wildfires is a significant source of air pollution, which can adversely impact air quality and ecosystems downwind. With the recently increasing intensity and severity of wildfires, the threat to air quality is expected to incre…
View article: Precursors and Pathways Leading to Enhanced Secondary Organic Aerosol Formation during Severe Haze Episodes
Precursors and Pathways Leading to Enhanced Secondary Organic Aerosol Formation during Severe Haze Episodes Open
Molecular analyses help to investigate the key precursors and chemical processes of secondary organic aerosol (SOA) formation. We obtained the sources and molecular compositions of organic aerosol in PM2.5 in winter in Beijing b…
View article: Iodine chemistry in the chemistry–climate model SOCOL-AERv2-I
Iodine chemistry in the chemistry–climate model SOCOL-AERv2-I Open
In this paper, we present a new version of the chemistry–climate model SOCOL-AERv2 supplemented by an iodine chemistry module. We perform three 20-year ensemble experiments to assess the validity of the modeled iodine and to quantify the e…
View article: The driving factors of new particle formation and growth in the polluted boundary layer
The driving factors of new particle formation and growth in the polluted boundary layer Open
New particle formation (NPF) is a significant source of atmospheric particles, affecting climate and air quality. Understanding the mechanisms involved in urban aerosols is important to develop effective mitigation strategies. However, NPF…
View article: Global tropospheric halogen (Cl, Br, I) chemistry and its impact on oxidants
Global tropospheric halogen (Cl, Br, I) chemistry and its impact on oxidants Open
We present an updated mechanism for tropospheric halogen (Cl + Br + I) chemistry in the GEOS-Chem global atmospheric chemical transport model and apply it to investigate halogen radical cycling and implications for tropospheric oxidants. I…
View article: Comment on amt-2021-223
Comment on amt-2021-223 Open
Abstract. Smoke from wildfires is a significant source of air pollution, which can adversely impact air quality and ecosystems downwind. With the recently increasing intensity and severity of wildfires, the threat to…