A5083972010- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Aeolian processes and effects
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Precipitation Measurement and Analysis
- Particle Dynamics in Fluid Flows
- Atmospheric Ozone and Climate
- Aerosol Filtration and Electrostatic Precipitation
- Wind and Air Flow Studies
- Icing and De-icing Technologies
- Air Quality Monitoring and Forecasting
- Geology and Paleoclimatology Research
- Hydrocarbon exploration and reservoir analysis
- Vehicle emissions and performance
- Air Quality and Health Impacts
- Plant Ecology and Soil Science
- Toxic Organic Pollutants Impact
- Cyclone Separators and Fluid Dynamics
- Spacecraft and Cryogenic Technologies
- Lightning and Electromagnetic Phenomena
- Urban Heat Island Mitigation
- Fluid Dynamics and Heat Transfer
- nanoparticles nucleation surface interactions
- Climate variability and models
Centre National de la Recherche Scientifique
2013-2024
Laboratoire de Météorologie Physique
2015-2024
Université Clermont Auvergne
2009-2022
Clermont Université
2010-2019
Observatoire de Physique du Globe de Clermont-Ferrand
2012-2019
Complexe de Recherche Interprofessionnel en Aérothermochimie
2017
Laboratoire de Glaciologie et Géophysique de l’Environnement
2013
Institut Pascal
2002
Met Office
1999
University of Leeds
1999
Abstract A theoretical model is formulated which allows the processes that control wet deposition of atmospheric pollutants to be included in cloud dynamic models. The considers condensation process and collision-coalescence which, coupled together, fate aerosol particles removed by clouds precipitation through nucleation scavenging impaction scavenging. was tested substituting a simple parcel for framework. In this form used determine time evolution particle mass scavenged drops as well...
Measured ice crystal concentrations in natural clouds at modest supercooling (temperature ~>−10°C) are often orders of magnitude greater than the number concentration primary nucleating particles. Therefore, it has long been proposed that a secondary production process must exist is able to rapidly enhance population following initial nucleation events. Secondary important for prediction and subsequent evolution some types clouds, but physical basis not understood rates well constrained. In...
Abstract. This paper discusses the influence of primary biological aerosols (PBA) on atmospheric chemistry and vice versa through microbiological chemical properties processes. Several studies have shown that PBA represent a significant fraction air particulate matter hence affect microstructure water uptake aerosol particles. Moreover, airborne micro-organisms, namely fungal spores bacteria, can transform constituents atmosphere by metabolic activity. Recent emphasized viability bacteria...
Abstract. Long-term monitoring of the chemical composition clouds (73 cloud events representing 199 individual samples) sampled at puy de Dôme (pdD) station (France) was performed between 2001 and 2011. Physicochemical parameters, as well concentrations major organic inorganic constituents, were measured analyzed by multicomponent statistical analysis. Along with corresponding back-trajectory plots, this allowed for distinguishing four different categories air masses reaching summit pdD:...
Abstract This paper provides a summary of the assessment report World Meteorological Organization (WMO) Expert Team on Weather Modification that discusses recent progress precipitation enhancement research. The has been underpinned by advances in our understanding cloud processes and interactions between clouds their environment, which, turn, have enabled substantial developments technical capabilities to both observe simulate from microphysical mesoscale. We focus two types most commonly...
Abstract. For the last 25 years, CO-PDD (Cézeaux-Aulnat-Opme-puy de Dôme) has evolved to become a full instrumented platform for atmospheric research. It received credentials as national observing in France and is internationally recognized global station GAW (Global Atmosphere Watch) network. reference site of European research infrastructures ACTRIS (Aerosol Cloud Trace gases Research Infrastructure) ICOS (Integrated Carbon Observing System). The located on top puy Dôme mountain (1465 m...
Our model for the scavenging of aerosol particles has been coupled with two-dimensional form convective cloud Clark and Collaborators. The combined was then used to simulate a warm meteorological situation which existed at 1100 LST 12 July 1985 over Hawaii; assuming an size distribution maritime number concentration mixed composition (NH4)2SO4 as soluble compound. A shallow developed 26 min after onset convection leading moderate rain began 45 ended 60 min. Various parameters characterize...
A theoretical model has been formulated which allows the processes control wet deposition of atmospheric aerosol particles and pollutant gases to be included in cloud dynamic models. The considered was allowed grow by condensation collision–coalescence, remove nucleation impaction scavenging, convective diffusion. tested using a simple air-parcel as framework. In this form used determine fate ammonium sulfate [(NH4)2SO4] sulfur dioxide (SO2) gas they became scavenged precipitation drops....
This paper describes a theoretical model which computes the collection efficiency of aerosol particles by droplets, due to combined action dynamic (inertia, weight and drag) electrophoresis forces acting on an particle radius 0.004≤a≤1.3μm around droplet 15≤A≤100μm. The electrostatic are defined following concept image charges. In given range, Brownian motion must be considered was consequently added model. A novel approach is developed, based Langevin's theory solved using Itô process....
Our 2-D dynamic model including spectral microphysics and scavenging has been evaluated for a warm precipitating convective cloud at Day 261 (18 September 1974) of the GATE campaign. Two different chemical species ((NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> NaCl) aerosol particles were followed in air, inside drops cloud, reaching ground. Concerning dynamics microphysics, as well wet deposition, results agree quite with available observations. The rained after 19 min life time. For...
Abstract. In the case of severe accident with loss containment in a nuclear plant, radionuclides are released into atmosphere form both gases and aerosol particles (Baklanov Sørensen, 2001). The analysis radioactive scavenged by rain after Chernobyl highlights certain differences between modelling studies environmental measurements. Part these discrepancies can probably be attributed to uncertainties efficiencies used calculate particle collection raindrops, particularly drops diameter...
Abstract Even though ice formation mechanisms in clouds probably obey all the same thermodynamic principles, associated mechanical and thermal energy transfers differ with respect to exact pathway phases. Consequently, heterogeneous nucleation parameterizations play an important role cloud modeling. The 1.5D bin-resolved microphysics Detailed Scavenging Model (DESCAM) was used assess of for different initiation processes. Homogeneous nucleation, deposition freezing, contact immersion...
Cloud processing of aerosol particles is an important process and is, for example, thought to be responsible the so-called “Hoppel-minimum” in marine particle distribution or contribute cell organization boundary layer clouds. A numerical study temporal spatial scales by typical stratocumulus clouds presented. The dynamical framework inspired observations during VOCALS (Variability American Monsoon System Ocean-Cloud-Atmosphere-Land Study) Regional Experiment Southeast Pacific. 3-D mesoscale...
The effects of an ice phase on the wet deposition aerosol particles was studied by means authors' 2D cloud dynamics model with spectral microphysics applied to Cooperative Convective Precipitation Experiment in Miles City, Montana, 19 July 1981. macrostructure as well microstructure simulated found agree observations. Although no on-site observations were available respect chemical composition and rain water, values predicted compared typical nearby measurements. following conclusions can be...
Ship tracks are a natural laboratory to isolate the effect of anthropogenic aerosol emissions on cloud properties. The Monterey Area Tracks (MAST) experiment in Pacific Ocean west Monterey, California, June 1994, provides an unprecedented data set for evaluating our understanding formation and persistence anomalous features that characterize ship tracks. includes conditions which marine boundary layer is both clean continentally influenced. Two case studies during MAST examined with detailed...
With the spectral scavenging and microphysics model DESCAM coupled to a 2D dynamic framework transport of aerosol particles by medium-sized convective cloud are investigated. For typical marine conditions author has found depletion boundary layer about 70%. Also, 70% vented up particle mass entered drops due nucleation. these simulations an increase in relative humidity, as well number concentration Aitken large giant near top. The humidity was outflow regions, while can be attributed...
A theoretical model has been formulated which allows the study of effects an ice phase on removal atmospheric aerosol particles by nucleation and impaction scavenging in a convective cloud. This microphysical model—although principle applicable to higher dimensional cloud dynamic models—was tested using simple parcel with entrainment as framework. The present applied numerically evaluated for grow via vapor deposition, collision, coalescence riming. computations were carried out...
Abstract. This paper discusses the influence of bioaerosols on atmospheric chemistry and vice versa through microbiological chemical properties processes. Several studies have shown that biological matter represents a significant fraction air particulate hence affects microstructure water uptake aerosol particles. Moreover, airborne micro-organisms can transform constituents atmosphere by metabolic activity. Recent emphasized viability bacteria degradation organic substances in cloud water....