Adrian Walser
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View article: Variability in hygroscopicity parameter, CCN number concentration and chemical composition of mineral dust-dominated air masses over the Mediterranean Sea
Variability in hygroscopicity parameter, CCN number concentration and chemical composition of mineral dust-dominated air masses over the Mediterranean Sea Open
Airborne mineral dust particles, next to sea salt, are the most abundant aerosol type by mass globally (Andreae, 1995). Not only these particles affect the Earth’s radiation budget, but they also modify cloud properties by serving as…
View article: Vertical Variability in morphology, chemistry and optical properties of the transported Saharan air layer measured from Cape Verde and the Caribbean
Vertical Variability in morphology, chemistry and optical properties of the transported Saharan air layer measured from Cape Verde and the Caribbean Open
The structural properties of the Saharan air layer (SAL) including chemical, morphological and optical properties were measured during the Saharan Aerosol Longrange TRansport and Aerosol Cloud interaction Experiment (SALTRACE- June/July 20…
View article: Impact of particle size, refractive index, and shape on the determination of the particle scattering coefficient – an optical closure study evaluating different nephelometer angular truncation and illumination corrections
Impact of particle size, refractive index, and shape on the determination of the particle scattering coefficient – an optical closure study evaluating different nephelometer angular truncation and illumination corrections Open
Aerosol particles in the atmosphere interact with solar radiation through scattering and absorption. Accurate aerosol optical properties are needed to reduce the uncertainties of climate predictions. The aerosol optical properties can be o…
View article: Comment on amt-2021-369
Comment on amt-2021-369 Open
Abstract. Aerosol particles in the atmosphere interact with solar radiation through scattering and absorption. Accurate aerosol optical properties are needed to reduce the uncertainties of climate predictions. The aerosol optical propertie…
View article: Impact of particle size, refractive index, and shape on the determination of the particle scattering coefficient – an optical closure study evaluating different nephelometer angular truncation and illumination corrections
Impact of particle size, refractive index, and shape on the determination of the particle scattering coefficient – an optical closure study evaluating different nephelometer angular truncation and illumination corrections Open
Aerosol particles in the atmosphere interact with solar radiation through scattering and absorption. Accurate aerosol optical properties are needed to reduce the uncertainties of climate predictions. The aerosol optical properties can be o…
View article: Supplementary material to "Impact of particle size, refractive index, and shape on the determination of the particle scattering coefficient – an optical closure study evaluating different nephelometer angular truncation and illumination corrections"
Supplementary material to "Impact of particle size, refractive index, and shape on the determination of the particle scattering coefficient – an optical closure study evaluating different nephelometer angular truncation and illumination corrections" Open
S1 Data evaluationIn the following sections, details on the data evaluation of the laboratory experiment are reported.An overview of the data evaluation is given in Sec.4.2 and in Fig. 2. of the main text. S1.1 Particle scattering coeffici…
View article: Cloud droplet formation at the base of tropical convective clouds: closure between modeling and measurement results of ACRIDICON–CHUVA
Cloud droplet formation at the base of tropical convective clouds: closure between modeling and measurement results of ACRIDICON–CHUVA Open
Aerosol–cloud interactions contribute to the large uncertainties in current estimates of climate forcing. We investigated the effect of aerosol particles on cloud droplet formation by model calculations and aircraft measurements over the A…
View article: Comment on acp-2021-80
Comment on acp-2021-80 Open
Abstract. Aerosolâcloud interactions contribute to the large uncertainties in current estimates of climate forcing. We investigated the effect of aerosol particles on cloud droplet formation by model calculations and aircraft measurement…
View article: Comment on acp-2021-80
Comment on acp-2021-80 Open
The main objective of the ACRIDICON-CHUVA (Aerosol, Cloud, Precipitation, and Radiation Interactions and Dynamics of Convective Cloud SystemsâCloud Processes of the Main Precipitation Systems in Brazil: A Contribution to Cloud Resolving …
View article: Cloud droplet number closure for tropical convective clouds duringthe ACRIDICON–CHUVA campaign
Cloud droplet number closure for tropical convective clouds duringthe ACRIDICON–CHUVA campaign Open
The main objective of the ACRIDICON-CHUVA (Aerosol, Cloud, Precipitation, and Radiation Interactions and Dynamics of Convective Cloud Systems–Cloud Processes of the Main Precipitation Systems in Brazil: A Contribution to Cloud Resolving Mo…
View article: Model-based closure experiments with optical particle counters for dust-like aerosols
Model-based closure experiments with optical particle counters for dust-like aerosols Open
<div> <div></div> </div><div><!-- COMO-HTML-CONTENT-START --> <p>The size distribution of desert dust is a central parameter, e.g., for the dust climate effect and the fertilization of oceans and r…
View article: Modelling mineral dust emissions and atmospheric dispersion with MADE3 in EMAC v2.54
Modelling mineral dust emissions and atmospheric dispersion with MADE3 in EMAC v2.54 Open
It was hypothesized that using mineral dust emission climatologies in global chemistry climate models (GCCMs), i.e. prescribed monthly-mean dust emissions representative of a specific year, may lead to misrepresentations of strong dust bur…
View article: Retrieval of microphysical dust particle properties from SALTRACE lidar observations: Case studies
Retrieval of microphysical dust particle properties from SALTRACE lidar observations: Case studies Open
Saharan dust is a major natural atmospheric aerosol component with significant impact on the Earth radiation budget. In this work we determine the microphysical properties of dust particles after a long-range transport over the Atlantic Oc…
View article: Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke
Influx of African biomass burning aerosol during the Amazonian dry season through layered transatlantic transport of black carbon-rich smoke Open
Black carbon (BC) aerosols influence the Earth's atmosphere and climate, but their microphysical properties, spatiotemporal distribution, and long-range transport are not well constrained. This study presents airborne observations of the t…
View article: Mineral dust modelling with MADE3 in EMAC v2.54
Mineral dust modelling with MADE3 in EMAC v2.54 Open
Mineral dust particles play an important role in the climate system, by e.g. interacting with solar and terrestrial radiation or facilitating the formation of cloud droplets. Additionally, dust particles can act as very efficient ice nucle…
View article: Coarse and giant particles are ubiquitous in Saharan dust export regions and are radiatively significant over the Sahara
Coarse and giant particles are ubiquitous in Saharan dust export regions and are radiatively significant over the Sahara Open
<p>Mineral dust is an important component of the climate system, interacting with radiation, clouds, and biogeochemical systems and impacting atmospheric circulation, air quality, aviation, and solar energy generation. These impacts …
View article: Coarse and giant particles are ubiquitous in Saharan dust export regions and are radiatively significant over the Sahara
Coarse and giant particles are ubiquitous in Saharan dust export regions and are radiatively significant over the Sahara Open
Mineral dust is an important component of the climate system, interacting with radiation, clouds, and biogeochemical systems and impacting atmospheric circulation, air quality, aviation, and solar energy generation. These impacts are sensi…
View article: Profiles of cloud condensation nuclei, dust mass concentration, and ice-nucleating-particle-relevant aerosol properties in the Saharan Air Layer over Barbados from polarization lidar and airborne in situ measurements
Profiles of cloud condensation nuclei, dust mass concentration, and ice-nucleating-particle-relevant aerosol properties in the Saharan Air Layer over Barbados from polarization lidar and airborne in situ measurements Open
The present study aims to evaluate lidar retrievals of cloud-relevant aerosol properties by using polarization lidar and coincident airborne in situ measurements in the Saharan Air Layer (SAL) over the Barbados region. Vertical profiles of…
View article: Influx of African biomass burning aerosol during the Amazonian dry seasonthrough layered transatlantic transport of black carbon-rich smoke
Influx of African biomass burning aerosol during the Amazonian dry seasonthrough layered transatlantic transport of black carbon-rich smoke Open
Black carbon (BC) aerosols are influencing the Earth’s atmosphere and climate, but their microphysical properties, spatiotemporal distribution and long-range transport are not well constrained. This study analyzes the transatlantic transpo…
View article: Coarse and Giant Particles are Ubiquitous in Saharan Dust Export Regionsand are Radiatively Significant over the Sahara
Coarse and Giant Particles are Ubiquitous in Saharan Dust Export Regionsand are Radiatively Significant over the Sahara Open
Mineral dust is an important component of the climate system, interacting with radiation, clouds and biogeochemical systems, and impacting atmospheric circulation, air quality, aviation and solar energy generation. These impacts are sensit…
View article: CCN concentration and INP-relevant aerosol profiles in the Saharan Air Layer over Barbados from polarization lidar and airborne in situ measurements
CCN concentration and INP-relevant aerosol profiles in the Saharan Air Layer over Barbados from polarization lidar and airborne in situ measurements Open
The present study aims to validate lidar retrievals of cloud-relevant aerosol properties by using polarization lidar and coincident airborne in situ measurements in the Saharan Air Layer over the Barbados region. Vertical profiles of the n…
View article: Estimation of dust related ice nucleating particles in the atmosphere: Comparison of profiling and in-situ measurements
Estimation of dust related ice nucleating particles in the atmosphere: Comparison of profiling and in-situ measurements Open
Vertical profiles of number concentrations of dust particles relevant for ice nucleation in clouds are derived from lidar measurements. The results are compared to coincidental airborne in-situ measurements of particle number and surface a…
View article: Aircraft-based observations of isoprene-epoxydiol-derived secondary organic aerosol (IEPOX-SOA) in the tropical upper troposphere over the Amazon region
Aircraft-based observations of isoprene-epoxydiol-derived secondary organic aerosol (IEPOX-SOA) in the tropical upper troposphere over the Amazon region Open
During the ACRIDICON-CHUVA field project (September–October 2014; based in Manaus, Brazil) aircraft-based in situ measurements of aerosol chemical composition were conducted in the tropical troposphere over the Amazon using the High Altitu…
View article: Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin
Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin Open
Airborne observations over the Amazon Basin showed high aerosol particle concentrations in the upper troposphere (UT) between 8 and 15 km altitude, with number densities (normalized to standard temperature and pressure) often exceeding tho…
View article: On the parametrization of optical particle counter response including instrument-induced broadening of size spectra and a self-consistent evaluation of calibration measurements
On the parametrization of optical particle counter response including instrument-induced broadening of size spectra and a self-consistent evaluation of calibration measurements Open
Optical particle counters (OPCs) are common tools for the in situ measurement of aerosol particle number size distributions. As the actual quantity measured by OPCs is the intensity of light scattered by individual particles, it is necessa…
View article: Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin
Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin Open
Airborne observations over the Amazon Basin showed high aerosol particle concentrations in the upper troposphere (UT) between 8 and 15 km altitude, with number densities (normalized to standard temperature and pressure) often exceeding tho…
View article: Supplementary material to "Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin"
Supplementary material to "Aerosol characteristics and particle production in the upper troposphere over the Amazon Basin" Open
Figure S1: Example of a back-tracked parcel starting at the location of the HALO aircraft during flight AC18.This parcel started at 2014-09-28 20:34:53 UTC and was traced back in time in onehour steps up to 120 hours, as shown in the time …
View article: On the parametrization of optical particle counter response including instrument-induced broadening of size spectra and a self-consistent evaluation of calibration measurements
On the parametrization of optical particle counter response including instrument-induced broadening of size spectra and a self-consistent evaluation of calibration measurements Open
Optical particle counters (OPCs) are common tools for the in situ measurement of aerosol particle number size distributions. As the actual quantity measured by OPCs is the intensity of light scattered by individual particles, it is necessa…