Stephan Borrmann
YOU?
Author Swipe
View article: Transport of Biomass Burning Aerosol into the Extratropical Tropopause Region over Europe via Warm Conveyor Belt Uplift
Transport of Biomass Burning Aerosol into the Extratropical Tropopause Region over Europe via Warm Conveyor Belt Uplift Open
We present measurements from the aircraft-based TPEx (Tropopause composition gradients and mixing Experiment) mission in June 2024 over Europe. The measurement platform, a Learjet 35A, was equipped with in-situ trace gas and aerosol measur…
View article: CARIBIC-AMS: a fully automated aerosol mass spectrometer for operation on routine passenger flights (IAGOS-CARIBIC) – instrument description and first flight application
CARIBIC-AMS: a fully automated aerosol mass spectrometer for operation on routine passenger flights (IAGOS-CARIBIC) – instrument description and first flight application Open
In this study, we present a fully automated aerosol mass spectrometer (AMS) that is operated during regular passenger aircraft flights in the CARIBIC (Civil Aircraft for the Regular Investigation of the Atmosphere Based on an Instrument Co…
View article: Retention during freezing of raindrops – Part 1: Investigation of single and binary mixtures of nitric, formic, and acetic acids and 2-nitrophenol
Retention during freezing of raindrops – Part 1: Investigation of single and binary mixtures of nitric, formic, and acetic acids and 2-nitrophenol Open
The influence of freezing processes and vertical transport of trace gases into the upper atmosphere during deep convection is critical to understanding the distribution of aerosol precursors and their climate effects. We conducted experime…
View article: The Arctic Low-Level Mixed-Phase Haze Regime and its Microphysical Differences to Mixed-Phase Clouds
The Arctic Low-Level Mixed-Phase Haze Regime and its Microphysical Differences to Mixed-Phase Clouds Open
A comprehensive in-situ dataset of low-level Arctic clouds was collected in the Fram Strait during the HALO-(AC)3 campaign in spring 2022 using the research aircraft Polar 6. The clouds observed at altitudes below 1000 m were frequently in…
View article: Regional contributions to the chemical composition of the Asian tropopause aerosol layer (ATAL)
Regional contributions to the chemical composition of the Asian tropopause aerosol layer (ATAL) Open
View article: Transport of Biomass Burning Aerosol into the Extratropical Tropopause Region over Europe via Warm Conveyor Belt Uplift
Transport of Biomass Burning Aerosol into the Extratropical Tropopause Region over Europe via Warm Conveyor Belt Uplift Open
Aerosol particles in the extratropical upper troposphere and lower stratosphere (exUTLS) play a crucial role for the Earth‘s radiative budget. High temporal and spatial resolution measurements in the exUTLS are important to study mixing pr…
View article: A comprehensive in situ and remote sensing data set collected during the HALO–(𝒜 𝒞) <sup>3</sup> aircraft campaign
A comprehensive in situ and remote sensing data set collected during the HALO–(𝒜 𝒞) <sup>3</sup> aircraft campaign Open
The HALO–(𝒜𝒞)3 aircraft campaign was carried out in March and April 2022 over the Norwegian and Greenland seas, the Fram Strait, and the central Arctic Ocean. Three research aircraft – the High Altitude and Long Range Research Aircraft (HA…
View article: CARIBIC-AMS: A fully automated aerosol mass spectrometer for operation on routine passenger flights (IAGOS-CARIBIC): Instrument description and first flight application in the UTLS
CARIBIC-AMS: A fully automated aerosol mass spectrometer for operation on routine passenger flights (IAGOS-CARIBIC): Instrument description and first flight application in the UTLS Open
In this study, we present a fully automated aerosol mass spectrometer (AMS) that is operated during regular passenger aircraft flights in the CARIBIC (Civil Aircraft for the Regular Investigation of the Atmosphere Based on an Instrument Co…
View article: Retention During Freezing of Raindrops, Part I: Investigation of Single and Binary Mixtures
Retention During Freezing of Raindrops, Part I: Investigation of Single and Binary Mixtures Open
The interaction with freezing processes and vertical transport of trace gases into the upper atmosphere during deep convection is critical to understanding the distribution of aerosol precursors and their climate effects. We conducted expe…
View article: Retention of <i>α</i> -pinene oxidation products and nitro-aromatic compounds during riming
Retention of <i>α</i> -pinene oxidation products and nitro-aromatic compounds during riming Open
Riming is an important growth process of graupel and hailstones in the mixed-phase zones of clouds, during which supercooled liquid droplets freeze on the surface of ice particles by contact. Compounds dissolved in the supercooled cloud dr…
View article: Particulate emissions from cooking: emission factors, emission dynamics, and mass spectrometric analysis for different cooking methods
Particulate emissions from cooking: emission factors, emission dynamics, and mass spectrometric analysis for different cooking methods Open
Since most people, especially in developed countries, spend most of their time indoors, they are heavily exposed to indoor aerosols, which can potentially lead to adverse health effects. A major source of indoor aerosols are cooking activi…
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
View article: Overview: quasi-Lagrangian observations of Arctic air mass transformations – introduction and initial results of the HALO–(𝒜 𝒞) <sup>3</sup> aircraft campaign
Overview: quasi-Lagrangian observations of Arctic air mass transformations – introduction and initial results of the HALO–(𝒜 𝒞) <sup>3</sup> aircraft campaign Open
Global warming is amplified in the Arctic. However, numerical models struggle to represent key processes that determine Arctic weather and climate. To collect data that help to constrain the models, the HALO–(𝒜𝒞)3 aircraft campaign was con…
View article: A comprehensive in-situ and remote sensing data set collected during the HALO–(AC) <sup>3</sup> aircraft campaign
A comprehensive in-situ and remote sensing data set collected during the HALO–(AC) <sup>3</sup> aircraft campaign Open
The HALO–(AC)3 aircraft campaign was carried out in March and April 2022 over the Norwegian and Greenland Seas, the Fram Strait, and the central Arctic Ocean. Three research aircraft, the High Altitude and Long Range Research Aircraft (HAL…
View article: The influence of extratropical cross-tropopause mixing on the correlation between ozone and sulfate aerosol in the lowermost stratosphere
The influence of extratropical cross-tropopause mixing on the correlation between ozone and sulfate aerosol in the lowermost stratosphere Open
The chemical composition of the upper troposphere/lower stratosphere region (UTLS) is influenced by horizontal transport of air masses, vertical transport within convective systems and warm conveyor belts, rapid turbulent mixing, as well a…
View article: Retention of α-pinene oxidation products and nitro-aromatic compounds during riming
Retention of α-pinene oxidation products and nitro-aromatic compounds during riming Open
Riming is an important growth process of graupel and hailstones in mixed-phase zones of clouds, during which supercooled liquid droplets freeze on the surface of ice particles by contact. Compounds dissolved in the supercooled cloud drople…
View article: Comment on egusphere-2024-516
Comment on egusphere-2024-516 Open
Abstract. An air quality model ensemble is used to represent the current state-of-the-art in atmospheric modeling, composed of two global forecasts and two regional simulations. The model ensemble assessment focuses on bot…
View article: Comment on egusphere-2024-516
Comment on egusphere-2024-516 Open
Abstract. An air quality model ensemble is used to represent the current state-of-the-art in atmospheric modeling, composed of two global forecasts and two regional simulations. The model ensemble assessment focuses on bot…
View article: Comment on egusphere-2024-783
Comment on egusphere-2024-783 Open
Abstract. The global warming is amplified in the Arctic. To collect data that help to constrain weather and climate models, which often do not realistically represent the enhanced Arctic warming, the HALO-(AC)³ aircraft ca…
View article: Characterization of refractory aerosol particles collected in the tropical upper troposphere–lower stratosphere (UTLS) within the Asian tropopause aerosol layer (ATAL)
Characterization of refractory aerosol particles collected in the tropical upper troposphere–lower stratosphere (UTLS) within the Asian tropopause aerosol layer (ATAL) Open
Aerosol particles with diameters larger than 40 nm were collected during the flight campaign StratoClim 2017 within the Asian tropopause aerosol layer (ATAL) of the 2017 monsoon anticyclone above the Indian subcontinent. A multi-impactor s…
View article: Comment on egusphere-2024-521
Comment on egusphere-2024-521 Open
Abstract. The concentration of carbonaceous aerosols, black carbon (BC) and organic aerosol (OA), in the atmosphere is related to co-emitted or co-produced trace gases. In this study, we investigate the most relevant propo…
View article: Comment on egusphere-2024-521
Comment on egusphere-2024-521 Open
Abstract. The concentration of carbonaceous aerosols, black carbon (BC) and organic aerosol (OA), in the atmosphere is related to co-emitted or co-produced trace gases. In this study, we investigate the most relevant propo…
View article: Comment on egusphere-2024-516
Comment on egusphere-2024-516 Open
Abstract. An air quality model ensemble is used to represent the current state-of-the-art in atmospheric modeling, composed of two global forecasts and two regional simulations. The model ensemble assessment focuses on bot…
View article: Overview: Quasi-Lagrangian observations of Arctic air mass transformations – Introduction and initial results of the HALO–(AC) <sup>3</sup> aircraft campaign
Overview: Quasi-Lagrangian observations of Arctic air mass transformations – Introduction and initial results of the HALO–(AC) <sup>3</sup> aircraft campaign Open
The global warming is amplified in the Arctic. To collect data that help to constrain weather and climate models, which often do not realistically represent the enhanced Arctic warming, the HALO-(AC)³ aircraft campaign was conducted in Mar…
View article: Transport of ammonium nitrate and organic aerosol into the extratropical stratosphere associated with the Asian monsoon outflow
Transport of ammonium nitrate and organic aerosol into the extratropical stratosphere associated with the Asian monsoon outflow Open
The Asian Monsoon Anticyclone (AMA) is of global importance because of its role in transporting pollutants over long distances through dynamic processes such as eddy shedding. Its impact extends beyond the Asian region to Europe and North …
View article: Chemical perturbations from Asian summer monsoon in the extratropical UTLS during PHILEAS
Chemical perturbations from Asian summer monsoon in the extratropical UTLS during PHILEAS Open
The Asian monsoon anticyclone (AMA) during northern summer is a major contributor to the transport of tropospheric air masses, rich in water vapour, aerosol precursors and surface emissions , into the UTLS. During previous HALO missions TA…
View article: The influence of extratropical cross-tropopause mixing on the correlation between ozone and sulfate aerosol in the lowermost stratosphere
The influence of extratropical cross-tropopause mixing on the correlation between ozone and sulfate aerosol in the lowermost stratosphere Open
The composition of the upper troposphere/lower stratosphere region (UTLS) is influenced by long-range or regional transport in the troposphere and stratosphere, vertical transport within convective systems and warm conveyor belts, rapid tu…
View article: Evaluating the importance of nitrate aerosol in the upper troposphere and lower stratosphere during the Asian summer monsoon season
Evaluating the importance of nitrate aerosol in the upper troposphere and lower stratosphere during the Asian summer monsoon season Open
The Asian Summer Monsoon (ASM), as well as tropical convection, transport aerosols and their precursors from the boundary layer to the upper troposphere and lower stratosphere (UTLS). We utilize the Community Aerosol and Radiation Model fo…
View article: Air quality model assessment in city plumes of Europe and East Asia
Air quality model assessment in city plumes of Europe and East Asia Open
An air quality model ensemble is used to represent the current state-of-the-art in atmospheric modeling, composed of two global forecasts and two regional simulations. The model ensemble assessment focuses on both carbonaceous aerosols, i.…
View article: Proportional relationships between carbonaceous aerosols and trace gases in city plumes of Europe and East Asia
Proportional relationships between carbonaceous aerosols and trace gases in city plumes of Europe and East Asia Open
The concentration of carbonaceous aerosols, black carbon (BC) and organic aerosol (OA), in the atmosphere is related to co-emitted or co-produced trace gases. In this study, we investigate the most relevant proportional relationships betwe…