Armin Hansel
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View article: Global impact of anthropogenic NH <sub>3</sub> emissions on upper tropospheric aerosol formation
Global impact of anthropogenic NH <sub>3</sub> emissions on upper tropospheric aerosol formation Open
Anthropogenic ammonia (NH 3 ) emissions have significantly increased in recent decades due to enhanced agricultural activities, contributing to global air pollution. While the effects of NH 3 on surface air quality are well documented, its…
View article: Isoprene chemistry under upper-tropospheric conditions
Isoprene chemistry under upper-tropospheric conditions Open
View article: Molecular Composition of Organic Peroxides in Secondary Organic Aerosols Revealed by Peroxide-Iodide Reactivity
Molecular Composition of Organic Peroxides in Secondary Organic Aerosols Revealed by Peroxide-Iodide Reactivity Open
Organic peroxides are recognized as major contributors to the toxicity and adverse health effects of secondary organic aerosols (SOA). However, their molecular composition and chemical properties in SOA remain largely unexplored. Here we d…
View article: Calibrating Interdependent Photochemistry, Nucleation, and Aerosol Microphysics in Chamber Experiments
Calibrating Interdependent Photochemistry, Nucleation, and Aerosol Microphysics in Chamber Experiments Open
Laboratory experiments addressing complex phenomena such as atmospheric new-particle formation and growth typically involve numerous instruments measuring a range of key coupled variables. In addition to independent calibration, the combin…
View article: Anthropogenic organic aerosol in Europe produced mainly through second-generation oxidation
Anthropogenic organic aerosol in Europe produced mainly through second-generation oxidation Open
Exposure to anthropogenic atmospheric aerosol is a major health issue, causing several million deaths per year worldwide. The oxidation of aromatic hydrocarbons from traffic and wood combustion is an important anthropogenic source of low-v…
View article: New particle formation from isoprene under upper-tropospheric conditions
New particle formation from isoprene under upper-tropospheric conditions Open
View article: Ammonium CI-Orbitrap: a tool for characterizing the reactivity of oxygenated organic molecules
Ammonium CI-Orbitrap: a tool for characterizing the reactivity of oxygenated organic molecules Open
Oxygenated organic molecules (OOMs) play an important role in the formation of atmospheric aerosols. Due to various analytical challenges with respect to measuring organic vapors, uncertainties remain regarding the formation and fate of OO…
View article: Comment on amt-2023-149
Comment on amt-2023-149 Open
Abstract. Oxygenated organic molecules (OOMs) play an important role in the formation of atmospheric aerosols. Due to various analytical challenges in measuring organic vapors, uncertainties remain in the formation and fat…
View article: Nitrate Radicals Suppress Biogenic New Particle Formation from Monoterpene Oxidation
Nitrate Radicals Suppress Biogenic New Particle Formation from Monoterpene Oxidation Open
Highly oxygenated organic molecules (HOMs) are a major source of new particles that affect the Earth's climate. HOM production from the oxidation of volatile organic compounds (VOCs) occurs during both the day and night and can lead to new…
View article: Temperature, humidity, and ionisation effect of iodine oxoacid nucleation
Temperature, humidity, and ionisation effect of iodine oxoacid nucleation Open
Raising the ionisation rate (IR) increases the ion concentration, but also amplifies ion losses due to ion–ion recombination, consequently diminishing the formation rate of charged clusters at low HIO 3 concentrations.
View article: Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere
Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere Open
The main nucleating vapor in the atmosphere is thought to be sulfuric acid (H 2 SO 4 ), stabilized by ammonia (NH 3 ). However, in marine and polar regions, NH 3 is generally low, and H 2 SO 4 is frequently found together with iodine oxoac…
View article: Opinion: The strength of long-term comprehensive observations to meet multiple grand challenges in different environments and in the atmosphere
Opinion: The strength of long-term comprehensive observations to meet multiple grand challenges in different environments and in the atmosphere Open
To be able to meet global grand challenges (climate change; biodiversity loss; environmental pollution; scarcity of water, food and energy supplies; acidification; deforestation; chemicalization; pandemics), which all are closely interlink…
View article: Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere: data resources
Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere: data resources Open
Data resources for manuscript: "Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere"
View article: Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere: data resources
Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere: data resources Open
Data resources for manuscript: "Iodine oxoacids enhance nucleation of sulfuric acid particles in the atmosphere"
View article: Role of sesquiterpenes in biogenic new particle formation
Role of sesquiterpenes in biogenic new particle formation Open
Biogenic vapors form new particles in the atmosphere, affecting global climate. The contributions of monoterpenes and isoprene to new particle formation (NPF) have been extensively studied. However, sesquiterpenes have received little atte…
View article: Ammonium CI-Orbitrap: a tool for characterizing the reactivity of oxygenated organic molecules
Ammonium CI-Orbitrap: a tool for characterizing the reactivity of oxygenated organic molecules Open
Oxygenated organic molecules (OOMs) play an important role in the formation of atmospheric aerosols. Due to various analytical challenges in measuring organic vapors, uncertainties remain in the formation and fate of OOMs. The chemical ion…
View article: Supplementary material to "Ammonium CI-Orbitrap: a tool for characterizing the reactivity of oxygenated organic molecules"
Supplementary material to "Ammonium CI-Orbitrap: a tool for characterizing the reactivity of oxygenated organic molecules" Open
View article: An intercomparison study of four different techniques for measuring the chemical composition of nanoparticles
An intercomparison study of four different techniques for measuring the chemical composition of nanoparticles Open
Currently, the complete chemical characterization of nanoparticles (< 100 nm) represents an analytical challenge, since these particles are abundant in number but have negligible mass. Several methods for particle-phase characterization ha…
View article: NO at low concentration can enhance the formation of highly oxygenated biogenic molecules in the atmosphere
NO at low concentration can enhance the formation of highly oxygenated biogenic molecules in the atmosphere Open
View article: Oxidized organic molecules in the tropical free troposphere over Amazonia
Oxidized organic molecules in the tropical free troposphere over Amazonia Open
New particle formation (NPF) in the tropical free troposphere (FT) is a globally important source of cloud condensation nuclei, affecting cloud properties and climate. Oxidized organic molecules (OOMs) produced from biogenic volatile organ…
View article: Opinion: The strength of long-term comprehensive observations to meet multiple grand challenges at different environments and in the atmosphere
Opinion: The strength of long-term comprehensive observations to meet multiple grand challenges at different environments and in the atmosphere Open
To be able to meet global grand challenges (climate change; biodiversity loss; environmental pollution; scarcity of water, food and energy supplies; acidification; deforestation; chemicalization; pandemics), which all are closely interlink…
View article: Measurement report: Molecular-level investigation of atmospheric cluster ions at the tropical high-altitude research station Chacaltaya (5240 m a.s.l.) in the Bolivian Andes
Measurement report: Molecular-level investigation of atmospheric cluster ions at the tropical high-altitude research station Chacaltaya (5240 m a.s.l.) in the Bolivian Andes Open
Air ions are the key components for a series of atmospheric physicochemical interactions, such as ion-catalyzed reactions, ion-molecule reactions, and ion-induced new particle formation (NPF). They also control atmospheric electrical prope…
View article: Nitrate radicals suppress biogenic new particle formation from monoterpene oxidation
Nitrate radicals suppress biogenic new particle formation from monoterpene oxidation Open
Highly oxygenated organic molecules (HOMs) are a major source of new particles affecting Earth’s climate1,2. HOM production from the oxidation of volatile organic compounds (VOCs) occurs during both day and night, and can lead t…
View article: Oxidized organic molecules in the tropical free troposphere over Amazonia
Oxidized organic molecules in the tropical free troposphere over Amazonia Open
New particle formation (NPF) in the tropical free troposphere (FT) is a globally important source of cloud condensation nuclei, affecting cloud properties and climate. Oxidized organic molecules (OOMs) produced from biogenic volatile organ…
View article: Molecular Understanding of the Enhancement in Organic Aerosol Mass at High Relative Humidity
Molecular Understanding of the Enhancement in Organic Aerosol Mass at High Relative Humidity Open
The mechanistic pathway by which high relative humidity (RH) affects gas-particle partitioning remains poorly understood, although many studies report increased secondary organic aerosol (SOA) yields at high RH. Here, we use real-time, mol…
View article: Measurement report: Long-range transport and the fate of dimethyl sulfide oxidation products in the free troposphere derived from observations at the high-altitude research station Chacaltaya (5240 m a.s.l.) in the Bolivian Andes
Measurement report: Long-range transport and the fate of dimethyl sulfide oxidation products in the free troposphere derived from observations at the high-altitude research station Chacaltaya (5240 m a.s.l.) in the Bolivian Andes Open
Dimethyl sulfide (DMS) is the primary natural contributor to the atmospheric sulfur burden. Observations concerning the fate of DMS oxidation products after long-range transport in the remote free troposphere are, however, sparse. Here we …
View article: Measurement report: Molecular-level investigation of atmospheric cluster ions at the tropical high-altitude research station Chacaltaya (5240 m a.s.l.) in the Bolivian Andes
Measurement report: Molecular-level investigation of atmospheric cluster ions at the tropical high-altitude research station Chacaltaya (5240 m a.s.l.) in the Bolivian Andes Open
Air ions are the key components for a series of atmospheric physicochemical interactions, such as ion-catalyzed reactions, ion-molecule reactions, and ion-induced new particle formation. They also control atmospheric electrical properties …
View article: Supplementary material to "Measurement report: Molecular-level investigation of atmospheric cluster ions at the tropical high-altitude research station Chacaltaya (5240 m a.s.l.) in the Bolivian Andes"
Supplementary material to "Measurement report: Molecular-level investigation of atmospheric cluster ions at the tropical high-altitude research station Chacaltaya (5240 m a.s.l.) in the Bolivian Andes" 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
Iodine is a reactive trace element in atmospheric chemistry that destroys ozone and nucleates particles. Iodine emissions have tripled since 1950 and are projected to keep increasing with rising O 3 surface concentrations. Although iodic a…
View article: Referee comment on egusphere-2022-887
Referee comment on egusphere-2022-887 Open
Abstract. Dimethyl sulfide (DMS) is the primary natural contributor to the atmospheric sulfur burden. Observations concerning the fate of DMS oxidation products after long-range transport in the remote free troposphere are…