B. Kärcher
YOU?
Author Swipe
View article: Exploring sources of ice crystals in cirrus clouds: comparative analysis of two ice nucleation schemes in CAM6
Exploring sources of ice crystals in cirrus clouds: comparative analysis of two ice nucleation schemes in CAM6 Open
Ice crystal formation in cirrus clouds is poorly understood, and its representation remains a challenge in global climate models. To enhance the understanding, a novel ice nucleation parameterization based on the Kärcher (2022) (K22) schem…
View article: On the Lifetimes of Persistent Contrails and Contrail Cirrus
On the Lifetimes of Persistent Contrails and Contrail Cirrus Open
Prediction of contrail cirrus persistence is highly problematic for models, in part due to a poor representation of intertwined microphysical and dynamical processes controlling contrail evolution in large‐scale ice‐supersaturated areas. K…
View article: An updated microphysical model for particle activation in contrails: the role of volatile plume particles
An updated microphysical model for particle activation in contrails: the role of volatile plume particles Open
Global simulations suggest the mean annual contrail-cirrus net radiative forcing is comparable to that of aviation’s accumulated CO2 emissions. However, these simulations assume non-volatile particulate matter (nvPM) and ambient particles …
View article: Supplementary material to "An updated microphysical model for particle activation in contrails: the role of volatile plume particles"
Supplementary material to "An updated microphysical model for particle activation in contrails: the role of volatile plume particles" Open
View article: Dissecting cirrus clouds: navigating effects of turbulence on homogeneous ice formation
Dissecting cirrus clouds: navigating effects of turbulence on homogeneous ice formation Open
Turbulent air motions determine the local environment in which cloud ice crystals form. Homogeneous freezing of aqueous solution droplets is the most fundamental pathway to nucleate ice crystals in cirrus. Lack of knowledge about the role …
View article: Exploring Sources of Ice Crystals in Cirrus Clouds: Comparative Analysis of Two Ice Nucleation Schemes in CAM6
Exploring Sources of Ice Crystals in Cirrus Clouds: Comparative Analysis of Two Ice Nucleation Schemes in CAM6 Open
Ice nucleation, a critical process in cirrus clouds, remains a challenge in global climate models. To enhance the understanding, a novel ice nucleation parameterization based on the Kärcher (2022) (K22) scheme is introduced into the NCAR C…
View article: Revisiting Contrail Ice Formation: Impact of Primary Soot Particle Sizes and Contribution of Volatile Particles
Revisiting Contrail Ice Formation: Impact of Primary Soot Particle Sizes and Contribution of Volatile Particles Open
Aircraft contrails, formed largely on soot particles in current flights, are important for aviation's non-CO2 climate impact. Here we show that the activation of nonvolatile soot particles during contrail formation is likely det…
View article: The Impact of Gravity Waves on the Evolution of Tropical Anvil Cirrus Microphysical Properties
The Impact of Gravity Waves on the Evolution of Tropical Anvil Cirrus Microphysical Properties Open
Anvil cirrus generated by deep convection covers large fractions of the tropics and has important impacts on the Earth's radiation budget and climate. In situ measurements made with high‐altitude aircraft indicate a rapid transition in ice…
View article: Opinion: Tropical cirrus – from micro-scale processes to climate-scale impacts
Opinion: Tropical cirrus – from micro-scale processes to climate-scale impacts Open
Tropical cirrus clouds, i.e., any type of ice cloud with tops above 400 hPa, play a critical role in the climate system and are a major source of uncertainty in our understanding of global warming. Tropical cirrus clouds involve processes …
View article: Ice Supersaturation Variability in Cirrus Clouds: Role of Vertical Wind Speeds and Deposition Coefficients
Ice Supersaturation Variability in Cirrus Clouds: Role of Vertical Wind Speeds and Deposition Coefficients Open
Aircraft measurements reveal ice supersaturation statistics in cirrus (ISSs) with broad maxima around ice saturation and pronounced variance. In this study, processes shaping ISSs in midlatitude and tropical upper tropospheric conditions a…
View article: Data for the publication: Ice supersaturation variability in cirrus clouds: Role of vertical wind speeds and deposition coefficients
Data for the publication: Ice supersaturation variability in cirrus clouds: Role of vertical wind speeds and deposition coefficients Open
The files contain the datasets shown in the publication "Ice supersaturation variability in cirrus clouds: Role of vertical wind speeds and deposition coefficients" to appear in J. Geophys. Res. Atmos. (revised manuscript submitted). The f…
View article: Data for the publication: Ice supersaturation variability in cirrus clouds: Role of vertical wind speeds and deposition coefficients
Data for the publication: Ice supersaturation variability in cirrus clouds: Role of vertical wind speeds and deposition coefficients Open
The files contain the datasets shown in the publication "Ice supersaturation variability in cirrus clouds: Role of vertical wind speeds and deposition coefficients" to appear in J. Geophys. Res. Atmos. (revised manuscript submitted). The f…
View article: Opinion: Tropical cirrus — From micro-scale processes to climate-scale impacts
Opinion: Tropical cirrus — From micro-scale processes to climate-scale impacts Open
Tropical cirrus clouds play a critical role in the climate system and are a major source of uncertainty in our understanding of global warming. Tropical cirrus are affected by processes spanning a wide range of spatial and temporal scales,…
View article: The Role of Mineral Dust Aerosol Particles in Aviation Soot‐Cirrus Interactions
The Role of Mineral Dust Aerosol Particles in Aviation Soot‐Cirrus Interactions Open
Predicting cirrus cloud properties with confidence requires a sound understanding of the relative roles of homogeneous and heterogeneous ice formation. This study explores the effect of mineral dust and contrail‐processed aviation soot par…
View article: The role of mineral dust aerosol particles in aviation soot-cirrus interactions
The role of mineral dust aerosol particles in aviation soot-cirrus interactions Open
The files contain the datasets shown in the publication "The role of mineral dust aerosol particles in aviation soot-cirrus interactions" to appear in J. Geophys. Res. Atmos. (revised manuscript submitted) The files are xmgrace plot files …
View article: The role of mineral dust aerosol particles in aviation soot-cirrus interactions
The role of mineral dust aerosol particles in aviation soot-cirrus interactions Open
The files contain the datasets shown in the publication "The role of mineral dust aerosol particles in aviation soot-cirrus interactions" to appear in J. Geophys. Res. Atmos. (revised manuscript submitted) The files are xmgrace plot files …
View article: A Parameterization of Cirrus Cloud Formation: Revisiting Competing Ice Nucleation
A Parameterization of Cirrus Cloud Formation: Revisiting Competing Ice Nucleation Open
This study develops an advanced physically‐based parameterization of heterogeneous ice nucleation in cirrus clouds that includes an updated parameterization of stochastic homogeneous freezing of supercooled solution droplets. Both componen…
View article: Data for the publication: A parameterization of cirrus cloud formation: Revisiting competing ice nucleation
Data for the publication: A parameterization of cirrus cloud formation: Revisiting competing ice nucleation Open
The files contain the data sets shown in the publication "A parameterization of cirrus cloud formation: Revisiting competing ice nucleation" to appear in J. Geophys. Res. Atmos. in 2022 (revised manuscript submitted) The files include a po…
View article: Data for the publication: A parameterization of cirrus cloud formation: Revisiting competing ice nucleation
Data for the publication: A parameterization of cirrus cloud formation: Revisiting competing ice nucleation Open
The files contain the data sets shown in the publication "A parameterization of cirrus cloud formation: Revisiting competing ice nucleation" to appear in J. Geophys. Res. Atmos. in 2022 (revised manuscript submitted) The files include a po…
View article: Studies on the Competition Between Homogeneous and Heterogeneous Ice Nucleation in Cirrus Formation
Studies on the Competition Between Homogeneous and Heterogeneous Ice Nucleation in Cirrus Formation Open
Cirrus ice crystals are produced heterogeneously on ice‐nucleating particles (INPs) and homogeneously in supercooled liquid solution droplets. They grow by uptake of water molecules from the ice‐supersaturated vapor. The precursor particle…
View article: Studies on the competition between homogeneous and heterogeneous ice nucleation in cirrus formation
Studies on the competition between homogeneous and heterogeneous ice nucleation in cirrus formation Open
The files contain the data sets shown in the publication "Studies on the competition between homogeneous and heterogeneous ice nucleation in cirrus formation" to appear in J. Geophys. Res. - Atmos. in 2022. The plots can be created using t…
View article: Aerosol–cloud interactions: the representation of heterogeneous ice activation in cloud models
Aerosol–cloud interactions: the representation of heterogeneous ice activation in cloud models Open
The homogeneous nucleation of ice in supercooled liquid-water clouds is characterized by time-dependent freezing rates. By contrast, water phase transitions induced heterogeneously by ice-nucleating particles (INPs) are described by time-i…
View article: Aerosol–cloud interactions: the representation of heterogeneous ice activation in cloud models
Aerosol–cloud interactions: the representation of heterogeneous ice activation in cloud models Open
The files contain the data sets shown in the publication "Aerosol–cloud interactions: the representation of heterogeneous ice activation in cloud models" to appear in final form in the journal Atmos. Chem. Phys. in 2021. A preliminary disc…
View article: Aerosol–cloud interactions: the representation of heterogeneous ice activation in cloud models
Aerosol–cloud interactions: the representation of heterogeneous ice activation in cloud models Open
The files contain the data sets shown in the publication "Aerosol–cloud interactions: the representation of heterogeneous ice activation in cloud models" to appear in final form in the journal Atmos. Chem. Phys. in 2021. A preliminary disc…
View article: Comment on acp-2021-645
Comment on acp-2021-645 Open
Soot particles are important candidates for ice nucleating particles (INPs) in cirrus cloud formation which is known to exert a warming effect on climate. Bare soot particles, generally hydrophobic and fractal, mainly exist near emission s…
View article: Reply on RC1
Reply on RC1 Open
Abstract. The homogeneous nucleation of ice in supercooled liquid-water clouds is characterized by time-dependent freezing rates. By contrast, water phase transitions induced heterogeneously by ice-nucleating particles (IN…
View article: Reply on RC2
Reply on RC2 Open
Abstract. The homogeneous nucleation of ice in supercooled liquid-water clouds is characterized by time-dependent freezing rates. By contrast, water phase transitions induced heterogeneously by ice-nucleating particles (IN…
View article: Comment on acp-2021-511
Comment on acp-2021-511 Open
Abstract. The homogeneous nucleation of ice in supercooled liquid-water clouds is characterized by time-dependent freezing rates. By contrast, water phase transitions induced heterogeneously by ice-nucleating particles (IN…
View article: Aerosol-cloud interactions: The representation of heterogeneous ice activation in cloud models
Aerosol-cloud interactions: The representation of heterogeneous ice activation in cloud models Open
The homogeneous nucleation of ice in supercooled liquid water clouds is characterized by time-dependent freezing rates. By contrast, water phase transitions induced heterogeneously by ice nucleating particles (INPs) are described by time-i…
View article: Process-oriented analysis of aircraft soot-cirrus interactions constrains the climate impact of aviation
Process-oriented analysis of aircraft soot-cirrus interactions constrains the climate impact of aviation Open