Birger Bohn
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View article: Measurement report: Comprehensive seasonal study of the composition and sources of submicron aerosol during the JULIAC campaign in Germany
Measurement report: Comprehensive seasonal study of the composition and sources of submicron aerosol during the JULIAC campaign in Germany Open
The seasonal variations of aerosol sources and their atmospheric evolution are investigated using observations from the year-long JULIAC (Jülich Atmospheric Chemistry Project) campaign (January–November 2019) in Jülich, Germany. Non-refrac…
View article: Introducing aerosol-cloud interactions in the ECMWF model reveals new constraints on aerosol representation
Introducing aerosol-cloud interactions in the ECMWF model reveals new constraints on aerosol representation Open
Realistic number concentrations of aerosol cloud condensation nuclei (CCN) are critical to simulate the Earth’s atmosphere radiative budget. However, CCN concentrations are very uncertain, which critically limits our capacity to precisely …
View article: Measurement report: Comprehensive Seasonal Study of the Composition and Sources of Submicron Aerosol during the JULIAC Campaign in Germany
Measurement report: Comprehensive Seasonal Study of the Composition and Sources of Submicron Aerosol during the JULIAC Campaign in Germany Open
The seasonal variations of aerosol sources and their atmospheric evolution are investigated using observations from the year-long JULIAC campaign (January–November 2019) in Jülich, Germany. Non-refractory submicron aerosol components were …
View article: Ozone Production Efficiencies in the Three Largest United States Cities from Airborne Measurements
Ozone Production Efficiencies in the Three Largest United States Cities from Airborne Measurements Open
Despite ongoing reductions in emissions of ozone (O3) precursors, nitrogen oxides (NOx = NO + NO2) and volatile organic compounds (VOCs), the three largest urban areas in the United States ─ New York City (NYC), Chicago, and Los Angeles (L…
View article: Investigation of APNs Chemistry from the Oxidation of Volatile Organic Compounds in the Atmospheric Simulation Chamber SAPHIR
Investigation of APNs Chemistry from the Oxidation of Volatile Organic Compounds in the Atmospheric Simulation Chamber SAPHIR Open
Acyl peroxy nitrates (APNs) are important secondary pollutants in the troposphere, acting as reservoir for NOx (=NO2+NO). The relatively long lifetime of APNs (around 40 min at 298K) allows them to be transported from highly polluted areas…
View article: Isoprene nitrates drive new particle formation in Amazon’s upper troposphere
Isoprene nitrates drive new particle formation in Amazon’s upper troposphere Open
New particle formation (NPF) in the tropical upper troposphere is a globally important source of atmospheric aerosols 1–4 . It is known to occur over the Amazon basin, but the nucleation mechanism and chemical precursors have yet to be ide…
View article: Observational evidence reveals the significance of nocturnal chemistry in seasonal secondary organic aerosol formation
Observational evidence reveals the significance of nocturnal chemistry in seasonal secondary organic aerosol formation Open
Oxidized Organic Aerosol (OOA), a major component of fine atmospheric particles, impacts climate and human health. Previous experiments and atmospheric models emphasize the importance of nocturnal OOA formation from NO 3 · oxidation of bio…
View article: Effect of the Alkoxy Radical Chemistry on the Ozone Formation from Anthropogenic Organic Compounds Investigated in Chamber Experiments
Effect of the Alkoxy Radical Chemistry on the Ozone Formation from Anthropogenic Organic Compounds Investigated in Chamber Experiments Open
The photooxidation of five anthropogenic volatile organic compounds (propane, propene, isopentane, n-hexane, trans-2-hexene) at different levels of nitric oxide (NO) was investigated in the atmospheric simulation chamber SAPHIR, Forschungs…
View article: Investigation of the ozone formation of anthropogenic VOCs in the atmospheric simulation chamber SAPHIR
Investigation of the ozone formation of anthropogenic VOCs in the atmospheric simulation chamber SAPHIR Open
The hydroxyl radical (OH) is the most important daytime oxidant in the troposphere, initiating chemical degradation of volatile organic compounds (VOCs) and hence contributing to the formation of secondary pollutants such as ozone (O3). In…
View article: Hydroxyl Radicals and Oxidation Capacity in the Tropical Troposphere: Measurements from CAFE Field Campaigns using HORUS
Hydroxyl Radicals and Oxidation Capacity in the Tropical Troposphere: Measurements from CAFE Field Campaigns using HORUS Open
In the tropics, intense solar radiation drives photochemistry and strong convection, transporting air from the boundary layer to the upper troposphere. Conditions in the tropics are characterized by high humidity and UV intensity enhancing…
View article: Atmospheric photooxidation and ozonolysis of sabinene: reaction rate coefficients, product yields, and chemical budget of radicals
Atmospheric photooxidation and ozonolysis of sabinene: reaction rate coefficients, product yields, and chemical budget of radicals Open
The oxidation of sabinene by the hydroxyl radical (OH) and ozone (O3) was investigated under atmospherically relevant conditions in the atmospheric simulation chamber SAPHIR (Simulation of Atmospheric Photochemistry In a Large Reaction Cha…
View article: Measurement report: Carbonyl sulfide production during dimethyl sulfide oxidation in the atmospheric simulation chamber SAPHIR
Measurement report: Carbonyl sulfide production during dimethyl sulfide oxidation in the atmospheric simulation chamber SAPHIR Open
Carbonyl sulfide (OCS), the most abundant sulfur gas in the Earth's atmosphere, is a greenhouse gas, a precursor to stratospheric sulfate aerosol, and a proxy for terrestrial CO2 uptake. Estimates of important OCS sources and sinks still h…
View article: Comment on egusphere-2023-1317
Comment on egusphere-2023-1317 Open
Abstract. The oxidation of sabinene by the hydroxyl radical (OH) and ozone (O3) was investigated under atmospherically relevant conditions in the atmospheric simulation chamber SAPHIR at Forschungszentrum Jülich, Germany. The rate constant…
View article: Airborne observations of peroxy radicals during the EMeRGe campaign in Europe
Airborne observations of peroxy radicals during the EMeRGe campaign in Europe Open
In this study, airborne measurements of the sum of hydroperoxyl (HO2) and organic peroxy (RO2) radicals that react with nitrogen monoxide (NO) to produce nitrogen dioxide (NO2), coupled with actinometry and other key trace gases measuremen…
View article: Atmospheric photooxidation and ozonolysis of sabinene: Reaction rate constants, product yields and chemical budget of radicals
Atmospheric photooxidation and ozonolysis of sabinene: Reaction rate constants, product yields and chemical budget of radicals Open
The oxidation of sabinene by the hydroxyl radical (OH) and ozone (O3) was investigated under atmospherically relevant conditions in the atmospheric simulation chamber SAPHIR at Forschungszentrum Jülich, Germany. The rate constants of the r…
View article: Measurement report: Hydrogen peroxide in the upper tropical troposphere over the Atlantic Ocean and western Africa during the CAFE-Africa aircraft campaign
Measurement report: Hydrogen peroxide in the upper tropical troposphere over the Atlantic Ocean and western Africa during the CAFE-Africa aircraft campaign Open
This study focuses on the distribution of hydrogen peroxide (H2O2) in the upper tropical troposphere at altitudes between 8 and 15 km based on in situ observations during the Chemistry of the Atmosphere: Field Experiment in Africa (CAFE-Af…
View article: Measurement Report: Carbonyl Sulfide production during Dimethyl Sulfide oxidation in the atmospheric simulation chamber SAPHIR
Measurement Report: Carbonyl Sulfide production during Dimethyl Sulfide oxidation in the atmospheric simulation chamber SAPHIR Open
Carbonyl sulfide (OCS), the most abundant sulfur gas in the Earth’s atmosphere, is a greenhouse gas, a precursor to stratospheric sulfate aerosol, and a proxy for terrestrial CO2 uptake. Estimates of important OCS sources and sinks still b…
View article: Hydrogen peroxide in the upper tropical troposphere over the Atlantic Ocean and western Africa during the CAFE-Africa aircraft campaign
Hydrogen peroxide in the upper tropical troposphere over the Atlantic Ocean and western Africa during the CAFE-Africa aircraft campaign Open
We provide here the supporting dataset for our study on airborne measurements of oh hydrogen peroxide in the upper tropical troposphere over the Atlantic Ocean and western Africa during the CAFE-Africa aircraft campaign in 2018.
View article: Hydrogen peroxide in the upper tropical troposphere over the Atlantic Ocean and western Africa during the CAFE-Africa aircraft campaign
Hydrogen peroxide in the upper tropical troposphere over the Atlantic Ocean and western Africa during the CAFE-Africa aircraft campaign Open
We provide here the supporting dataset for our study on airborne measurements of oh hydrogen peroxide in the upper tropical troposphere over the Atlantic Ocean and western Africa during the CAFE-Africa aircraft campaign in 2018.
View article: Validation of Sentinel-5P TROPOMI tropospheric NO <sub>2</sub> products by comparison with NO <sub>2</sub> measurements from airborne imaging DOAS, ground-based stationary DOAS, and mobile car DOAS measurements during the S5P-VAL-DE-Ruhr campaign
Validation of Sentinel-5P TROPOMI tropospheric NO <sub>2</sub> products by comparison with NO <sub>2</sub> measurements from airborne imaging DOAS, ground-based stationary DOAS, and mobile car DOAS measurements during the S5P-VAL-DE-Ruhr campaign Open
Airborne imaging differential optical absorption spectroscopy (DOAS), ground-based stationary DOAS, and car DOAS measurements were conducted during the S5P-VAL-DE-Ruhr campaign in September 2020. The campaign area is located in the Rhine-R…
View article: Ceilometer aerosol retrieval and comparison with in-situ tower-measurements
Ceilometer aerosol retrieval and comparison with in-situ tower-measurements Open
In recent years there is a growing interest in real-time aerosol profiling and in this context, the use of automated lidars and ceilometers (ALC) for aerosol remote sensing increased. Ceilometers were originally developed to measure cloud-…
View article: Effects of transport on a biomass burning plume from Indochina during EMeRGe-Asia identified by WRF-Chem
Effects of transport on a biomass burning plume from Indochina during EMeRGe-Asia identified by WRF-Chem Open
The Indochina biomass burning (BB) season in springtime has a substantial environmental impact on the surrounding areas in Asia. In this study, we evaluated the environmental impact of a major long-range BB transport event on 19 March 2018…
View article: Impact of reduced aircraft emission on HOx Chemistry in the upper troposphere during BLUESKY Campaign 2020.
Impact of reduced aircraft emission on HOx Chemistry in the upper troposphere during BLUESKY Campaign 2020. Open
Hydroxyl radicals are the most predominant daytime initiator for atmospheric oxidation processes. Due to the COVID -19 pandemic, there was a considerable reduction in emissions from industry and all means of transportation during spring 20…
View article: Measurements of nitrous acid (HONO), hydroxyl (OH), nitric oxide (NO), hydroperoxyl (HO2), and nitrogen dioxide (NO2) in the upper troposphere: is peroxynitrous acid (HOONO) a missing source of HONO?
Measurements of nitrous acid (HONO), hydroxyl (OH), nitric oxide (NO), hydroperoxyl (HO2), and nitrogen dioxide (NO2) in the upper troposphere: is peroxynitrous acid (HOONO) a missing source of HONO? Open
Discrepancies between expected and observed NO-NO2 ratios in the upper troposphere suggest the presence of an unknown NOX reservoir. We report on airborne remote sensing limb observations from the mini-DOAS instrument on board the HALO (Hi…
View article: Experimental chemical budgets of OH, HO <sub>2</sub> , and RO <sub>2</sub> radicals in rural air in western Germany during the JULIAC campaign 2019
Experimental chemical budgets of OH, HO <sub>2</sub> , and RO <sub>2</sub> radicals in rural air in western Germany during the JULIAC campaign 2019 Open
Photochemical processes in ambient air were studied using the atmospheric simulation chamber SAPHIR at Forschungszentrum Jülich, Germany. Ambient air was continuously drawn into the chamber through a 50 m high inlet line and passed through…