Christiane Voigt
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In-flight emission measurements with an autonomous payload behind a turboprop aircraft Open
This paper reports on the successful first deployment of a new, autonomously operating measurement system on a Grob G 520 Egrett aircraft, which was used as a chase aircraft to perform in-flight aerosol and trace gas measurements of engine…
View article: Fuel sulfur content can modulate contrail ice crystal numbers
Fuel sulfur content can modulate contrail ice crystal numbers Open
In recent efforts to reduce the radiative forcing of aviation, fuel design has gained increased attention. Sustainable Aviation Fuels are seeing wider adoption, and their positive impact on carbon dioxide and non-volatile soot particle emi…
Aerosol Fine Mode Fraction Retrievals for the Marine Boundary Layer From Airborne Lidar Open
Separating contributions of the fine and coarse modes is important for characterizing aerosols and assessing their impacts. This work develops retrievals of fine mode fraction (FMF) from lidar observables for the marine boundary layer (MBL…
Giant Cloud Condensation Nuclei enhanced Ice Sublimation Process: a potential mechanism in mixed-phase clouds Open
The Wegener–Bergeron–Findeisen (WBF) process describes the growth of ice crystals at the expense of supercooled liquid droplets in mixed-phase clouds, driven by phase transitions at temperatures below 0 °C. In this study, we introduce a po…
View article: High Accumulation Mode Aerosol Concentration and Moderate Aerosol Hygroscopicity Limit Impacts of Recent Particle Formation on Northwest Atlantic Post‐Frontal Clouds
High Accumulation Mode Aerosol Concentration and Moderate Aerosol Hygroscopicity Limit Impacts of Recent Particle Formation on Northwest Atlantic Post‐Frontal Clouds Open
Postfrontal cloud regime transitions often result from strong aerosol‐cloud‐precipitation interaction. Using ACTIVATE measurements from 40 flights, we show a diurnal pattern of evolving aerosol particle size distributions (PSD) in the mari…
Intercomparison of wind speed, temperature, and humidity data between dropsondes and aircraft in situ measurements Open
Airborne measurements of wind speed and direction, temperature, and relative humidity are critical due to their importance for atmospheric processes. Field campaigns with multiple coordinated aircraft present challenges when combining data…
View article: Airborne observations of cloud properties during their evolution from organized streets to isotropic cloud structures along an Arctic cold-air outbreak
Airborne observations of cloud properties during their evolution from organized streets to isotropic cloud structures along an Arctic cold-air outbreak Open
This case study explores the evolution of clouds during an Arctic cold-air outbreak in the Fram Strait region observed during the HALO–(𝒜𝒞)3 aircraft campaign. Our research provides information about the formation, structure, microphysical…
A combined observational and modelling approach to evaluate aerosol-cirrus interactions at high and mid-latitudes Open
Aerosol-cirrus interactions remain a major source of uncertainty in climate models due to the complex interplay of aerosol properties, ice nucleation pathways, and atmospheric conditions. In this study, we investigate the drivers of observ…
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…
Reduced contrail radiative effect for fleets with low soot and water vapour emissions Open
Besides the goal of net-zero carbon dioxide (CO2) emissions, reducing aviation’s climate impact also involves addressing other forcing effects, particularly radiative forcing from contrails. Current understanding suggests that decreasing b…
A method to retrieve mixed-phase cloud vertical structure from airborne lidar Open
A technique was developed to provide cloud phase information using data collected by the NASA Langley airborne High Spectral Resolution Lidar systems with a particular emphasis on mixed-phase cloud conditions, where boundaries and gradient…
View article: The NASA ACTIVATE Mission
The NASA ACTIVATE Mission Open
The NASA Aerosol Cloud Meteorology Interactions over the Western Atlantic Experiment (ACTIVATE) conducted 162 joint flights with two aircraft over the northwest Atlantic to study aerosol–cloud interactions (ACIs), which represent the large…
Giant Cloud Condensation Nuclei enhanced Ice Sublimation Process: A potential mechanism in mixed phase clouds Open
The Wegener-Bergeron-Findeisen (WBF) process describes the growth of ice crystals at the expense of supercooled liquid droplets in mixed-phase clouds, driven by phase transitions at temperatures below 0 °C. In this study, we introduce a po…
In-flight emission measurements with an autonomous payload behind a turboprop aircraft Open
This paper reports on successfully testing a new, autonomously operating measurement system on a Grob G 520 Egrett aircraft for in-flight aerosol and trace gas measurements of engine exhaust. A suite of in-house-built and commercially avai…
View article: Measurement report: A survey of meteorological and cloud properties during ACTIVATE’s postfrontal flights and their suitability for Lagrangian case studies
Measurement report: A survey of meteorological and cloud properties during ACTIVATE’s postfrontal flights and their suitability for Lagrangian case studies Open
Postfrontal clouds, often appearing as marine cold-air outbreaks (MCAOs) along eastern seaboards, undergo overcast-to-broken cloud regime transitions. Earth system models exhibit diverse radiative biases connected to postfrontal clouds, re…
View article: Fuel sulfur content can modulate contrail ice crystal numbers
Fuel sulfur content can modulate contrail ice crystal numbers Open
In recent efforts to reduce the radiative forcing of aviation, fuel design has gained increased attention. Sustainable Aviation Fuels (SAF) are seeing wider adoption, and their positive impact on CO2 and non-volatile soot particle emission…
View article: Substantial aircraft contrail formation at low soot emission levels
Substantial aircraft contrail formation at low soot emission levels Open
Contrail cirrus are a major contributor to the climate forcing from aviation. Yet, the number of contrail ice crystals forming behind aircraft with modern lean-burn engines is unknown. Theory spans a five orders of magnitude range in ice c…
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…
Operational feasibility of contrail avoidance by flight trajectory adaptation: first insights from the German 100-flights-trial Open
Over the past few decades, research has increasingly revealed the significant impact of non-CO2 emissions from aviation on global warming, with estimates suggesting they may account for as much or even more than the sector's entire CO2 foo…
View article: Uncertainties in contrail modelling of high impact regions
Uncertainties in contrail modelling of high impact regions Open
Aviation impacts Earth’s climate by the formation of contrails, where the largest fraction of the total atmospheric impact is caused by only a small fraction of flights. Forecasting of high impact regions which are likely to produce strong…
View article: Vertical transport and segregation of ice nucleating particles in deep convective clouds
Vertical transport and segregation of ice nucleating particles in deep convective clouds Open
Ice nucleating particles (INP) play a crucial role in shaping Earth's weather and climate by influencing cloud properties and precipitation behavior. However, their abundance in the free troposphere and transport mechanisms remain poorly c…
Designing a mission concept for atmospheric plume measurements during a rocket launch event Open
The frequency of space launches has increased dramatically as costs plummet and demand rises with the advent of use cases (such as mega constellations or larger-scale exploration). This increase in launch cadence is enabled by reusable lau…
Modeling the impact of aviation fuel hydrogen and sulfur content on contrail properties: insights and implications Open
Contrail cirrus represents the most significant warming component within the total aviation impact on climate, suspected to exceed even the effects of aviation CO2 emissions. It remains to be shown that regulating hydrogen and sulfur conte…
Modeling the formation of contrails produced by SAF emissions Open
Alternative aviation fuels represent a promising approach to reduce contrails climate effect. In the frame of VOLCAN (“VOL avec Carburants Alternatifs Nouveaux”) project (DGAC funding, collaboration with AIRBUS, Safran Aircraft Engines and…
Aerosol impacts on cirrus cloud formation and properties using in-situ and lidar measurements during CIRRUS-HL campaign  Open
Cirrus clouds cover about 30% of the Earth’s surface and play a crucial role in the Earth’s radiation balance. They are composed of ice crystals with various sizes and nonspherical shapes. Ice crystals can form through either homogeneous f…
A novel Contrail Detection Algorithm for the Meteosat Second Generation satellite Open
Contrail cirrus is estimated to be the largest contributor to global effective radiative forcing from aviation, surpassing even aviation CO2 emissions in their impact. One promising mitigation strategy is contrail avoidance by rerouting fl…
View article: Machine learning for improvement of upper-tropospheric relative humidity in ERA5 weather model data
Machine learning for improvement of upper-tropospheric relative humidity in ERA5 weather model data Open
Knowledge of humidity in the upper troposphere and lower stratosphere (UTLS) is of special interest due to its importance for cirrus cloud formation and its climate impact. However, the UTLS water vapor distribution in current weather mode…