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An investigation into the performance of four cloud droplet activation parameterisations
An investigation into the performance four cloud droplet activation parameterisations
2014/12/19
Cloud droplet number concentration prediction is central to large-scale weather and climate modelling. The benchmark cloud parcel model calculation of aerosol particle growth and activation, by diffus...
Correction of approximation errors with Random Forests applied to modelling of cloud droplet formation
approximation errors Random Forests
2014/12/12
n atmospheric models, due to their computational
time or resource limitations, physical processes have to be
simulated using reduced (i.e. simplified) models.
Chemical composition of ambient aerosol, ice residues and cloud droplet residues in mixed-phase clouds: single particle analysis during the Cloud and Aerosol Characterization Experiment (CLACE 6)
ambient aerosol ice residues cloud droplet residues the Cloud and Aerosol Characterization Experiment
2010/9/14
The mass spectra were binned in classes, based on the combination of dominating substances, such as mineral dust, sulfate, potassium and elemental carbon or organic material. The derived chemical info...
Characterization of particle cloud droplet activity and composition in the free troposphere and the boundary layer during INTEX-B
particle cloud droplet activity the free troposphere the boundary layer INTEX-B
2010/8/16
Measurements of cloud condensation nuclei (CCN), aerosol size distributions, and submicron aerosol composition were made as part of the Intercontinental Chemical Transport Experiment Phase B (INTEX-B)...
Thermodynamic properties and cloud droplet activation of a series of oxo-acids
Thermodynamic properties cloud droplet activation oxo-acids
2010/8/13
We have investigated the thermodynamic properties of four aliphatic oxo-dicarboyxlic acids identified or thought to be present in atmospheric particulate matter: oxosuccinic acid, 2-oxoglutaric acid, ...
Surfactants in cloud droplet activation: mixed organic-inorganic particles
cloud droplet activation organic-inorganic particles
2010/8/13
Organic compounds with surfactant properties are commonly found in atmospheric aerosol particles. Surface activity can significantly influence the cloud droplet forming ability of these particles. We ...
Parametric representation of the cloud droplet spectra for LES warm bulk microphysical schemes
the cloud droplet spectra LES warm bulk microphysical schemes
2010/8/13
Parametric functions are currently used to represent droplet spectra in clouds and to develop bulk parameterizations of the microphysical processes and of their interactions with radiation. The most f...
The sensitivity of stratocumulus-capped mixed layers to cloud droplet concentration: do LES and mixed-layer models agree?
stratocumulus-capped mixed layers droplet concentration LES and mixed-layer models
2010/8/12
The sensitivity of a stratocumulus-capped mixed layer to a change in cloud droplet concentration is evaluated with a large-eddy simulation (LES) and a mixed layer model (MLM). The strength of the seco...
Cloud droplet activation of mixed organic-sulfate particles produced by the photooxidation of isoprene
Cloud droplet mixed organic-sulfate particles the photooxidation of isoprene
2010/8/12
The cloud condensation nuclei (CCN) properties of ammonium sulfate particles mixed with organic material condensed during the hydroxyl-radical-initiated photooxidation of isoprene (C5H8) were investig...
Effects of boundary layer particle formation on cloud droplet number and changes in cloud albedo from 1850 to 2000
boundary layer particle formation cloud droplet number cloud albedo
2010/2/1
We use a global aerosol microphysics model to estimate the effect of particle formation through activation nucleation in the boundary layer (BL) on cloud droplet number concentration (CDNC) on global ...
Aerosol- and updraft-limited regimes of cloud droplet formation: influence of particle number, size and hygroscopicity on the activation of cloud condensation nuclei (CCN)
Aerosol- and updraft-limited regimes cloud droplet formation cloud condensation nuclei CCN
2009/9/27
We have investigated the formation of cloud droplets under pyro-convective conditions using a cloud parcel model with detailed spectral microphysics and with the κ-Köhler model approach for effic...
Parameterization of cloud droplet formation for global and regional models: including adsorption activation from insoluble CCN
cloud droplet formation global and regional models insoluble CCN
2009/5/7
Dust and black carbon aerosol have long been known to exert potentially important and diverse impacts on cloud droplet formation. Most studies to date focus on the soluble fraction of these particles,...
Remote sensing of water cloud droplet size distributions using the backscatter glory: a case study
water cloud droplet size distributions backscatter glory Remote sensing
2009/3/3
Cloud single scattering properties are mainly determined by the effective radius of the droplet size distribution. There are only few exceptions where the shape of the size distribution affects the op...
Cloud droplet activation and surface tension of mixtures of slightly soluble organics and inorganic salt
Cloud droplet activation slightly soluble organics inorganic salt
2009/2/6
Critical supersaturations for internally mixed particles of adipic acid, succinic acid and sodium chloride were determined experimentally for dry particles sizes in the range 40-130nm. Surface tension...
What does reflection from cloud sides tell us about vertical distribution of cloud droplet sizes?
reflection from cloud sides vertical distribution cloud droplet sizes
2009/1/20
Cloud development, the onset of precipitation and the effect of aerosol on clouds depend on the structure of the cloud profiles of droplet size and phase. Aircraft measurements of cloud profiles are l...