J. Kirkby
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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: Design and performance of the Cluster Ion Counter (CIC)
Design and performance of the Cluster Ion Counter (CIC) Open
A dilute plasma is continuously maintained in the troposphere by ionizing particle radiation from galactic cosmic rays and radon decay. Small ions in the 1–2 nm size range play an important role in atmospheric processes such as ion-induced…
View article: Isoprene Aerosol Growth in the Upper Troposphere: Application of the Diagonal Volatility Basis Set to CLOUD Chamber Measurements
Isoprene Aerosol Growth in the Upper Troposphere: Application of the Diagonal Volatility Basis Set to CLOUD Chamber Measurements Open
Isoprene oxygenated organic molecules (IP-OOM) can nucleate new particles in the upper troposphere. These particles may grow into cloud condensation nuclei and influence the clouds and climate. However, little is known about the individual…
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: New particle formation from alpha pinene and trace sulfuric acid in the CERN CLOUD chamber
New particle formation from alpha pinene and trace sulfuric acid in the CERN CLOUD chamber Open
New particle formation (NPF) contributes to about half of all cloud condensation nuclei worldwide (Gordon et al. 2017) and plays a critical role in understanding anthropogenic climate change (IPCC, 2021). A keymechanism driving atmospheric…
View article: Investigating Isoprene Oxidation in the Upper Troposphere: Insights from Cold-Temperature Chamber Experiments
Investigating Isoprene Oxidation in the Upper Troposphere: Insights from Cold-Temperature Chamber Experiments Open
Isoprene, the most abundantly volatile organic compound (VOC), plays a significant role in atmospheric chemistry, particularly in the upper troposphere. In the tropics, it is emitted in large quantities by rainforests. Driven by prevailing…
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: A diagonal volatility basis set to assess the condensation of organic vapors onto particles
A diagonal volatility basis set to assess the condensation of organic vapors onto particles Open
We present a “diagonal” Volatility Basis Set (dVBS) comparing gas-phase concentrations of oxygenated organic molecules (OOM) to their condensed-phase mass fractions.
View article: Design and performance of the Cluster Ion Counter (CIC)
Design and performance of the Cluster Ion Counter (CIC) Open
A dilute plasma is continuously maintained in the troposphere by ionising particle radiation from galactic cosmic rays and radon decay. Small ions in the 1–2 nm size range play an important role in atmospheric processes such as ion-induced…
View article: Low temperature growth of sub 10 nm particles by ammonium nitrate condensation
Low temperature growth of sub 10 nm particles by ammonium nitrate condensation Open
Ammonium nitrate will condense to tiny particles under sub-zero conditions, activating well below 10 nm.
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: The impact of ammonia on particle formation in the Asian Tropopause Aerosol Layer
The impact of ammonia on particle formation in the Asian Tropopause Aerosol Layer Open
During summer, ammonia emissions in Southeast Asia influence air pollution and cloud formation. Convective transport by the South Asian monsoon carries these pollutant air masses into the upper troposphere and lower stratosphere (UTLS), wh…
View article: Earth’s atmosphere protects the biosphere from nearby supernovae
Earth’s atmosphere protects the biosphere from nearby supernovae Open
Geological evidence indicates that a supernova within 100 parsecs of Earth occurs around once per million years. Such nearby supernovas can produce an intense gamma-ray burst and a 100-fold increase of cosmic rays, lasting several centurie…
View article: Potential pre-industrial–like new particle formation induced by pure biogenic organic vapors in Finnish peatland
Potential pre-industrial–like new particle formation induced by pure biogenic organic vapors in Finnish peatland Open
Pure biogenic new particle formation (NPF) induced by highly oxygenated organic molecules (HOMs) could be an important mechanism for pre-industrial aerosol formation. However, it has not been unambiguously confirmed in the ambient due to t…
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 fate of OOMs. The ch…
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: Assessing the importance of nitric acid and ammonia for particle growth in the polluted boundary layer
Assessing the importance of nitric acid and ammonia for particle growth in the polluted boundary layer Open
Inhomogeneities in temperature and ammonia concentrations can cause rapid growth of nanoparticles in polluted environments.
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: Interactions of peroxy radicals from monoterpene and isoprene oxidation simulated in the radical volatility basis set
Interactions of peroxy radicals from monoterpene and isoprene oxidation simulated in the radical volatility basis set Open
Isoprene affects new particle formation rates in environments and experiments also containing monoterpenes.
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: 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: Measurement of the collision rate coefficients between atmospheric ions and multiply charged aerosol particles in the CERN CLOUD chamber
Measurement of the collision rate coefficients between atmospheric ions and multiply charged aerosol particles in the CERN CLOUD chamber Open
Aerosol particles have an important role in Earth's radiation balance and climate, both directly and indirectly through aerosol–cloud interactions. Most aerosol particles in the atmosphere are weakly charged, affecting both their collision…
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…