A5089139040- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Air Quality and Health Impacts
- Precipitation Measurement and Analysis
- Air Quality Monitoring and Forecasting
- Climate variability and models
- Aeolian processes and effects
- Water Quality Monitoring and Analysis
- Indoor Air Quality and Microbial Exposure
- Isotope Analysis in Ecology
- Heavy metals in environment
- Groundwater and Isotope Geochemistry
- Paranormal Experiences and Beliefs
- Wind and Air Flow Studies
- Vehicle emissions and performance
- Catalytic Processes in Materials Science
- Electrochemical Analysis and Applications
- Toxic Organic Pollutants Impact
- Advanced oxidation water treatment
- Plant responses to elevated CO2
- Algal biology and biofuel production
- Various Chemistry Research Topics
Université Clermont Auvergne
2014-2023
Centre National de la Recherche Scientifique
2014-2023
Laboratoire de Météorologie Physique
2013-2023
Observatoire de Physique du Globe de Clermont-Ferrand
1990-2013
Laboratoire de Glaciologie et Géophysique de l’Environnement
2013
Institut Pascal
1997-2009
Laboratoire d'Informatique, de Modélisation et d'Optimisation des Systèmes
2009
Japan External Trade Organization
2007
Université Paris Cité
2005
Université Paris-Est Créteil
2005
Cloud droplets contain dynamic and complex pools of highly heterogeneous organic matter, resulting from the dissolution both water-soluble carbon in atmospheric aerosol particles gas-phase soluble species, are constantly impacted by chemical, photochemical, biological transformations. samples two summer events, characterized different air masses physicochemical properties, were collected at Puy de Dôme station France, concentrated on a strata-X solid-phase extraction cartridge directly...
Within cloud water, microorganisms are metabolically active and, thus, expected to contribute the atmospheric chemistry. This article investigates interactions between and reactive oxygenated species that present in water because these chemical compounds drive oxidant capacity of system. Real samples with contrasting features (marine, continental, urban) were taken from puy de Dôme mountain (France). The exhibited a high microbial biodiversity complex composition. media incubated dark...
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. The oxidative capacity of the cloud aqueous phase is investigated during three field campaigns from 2013 to 2014 at top puy de Dôme station (PUY) in France. A total 41 samples are collected and corresponding air masses classified as highly marine, marine continental. Hydroxyl radical (HO•) formation rates (RHO•f) determined using a photochemical setup (xenon lamp that can reproduce solar spectrum) chemical probe coupled with spectroscopic analysis trap all generated radicals for...
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...
A cloud water sample collected at the puy de Dôme observatory (PUY) has been incubated under dark conditions, with its endogenous microbiota two different temperatures (5 and 15 °C), change in molecular organic composition of this was analyzed by Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Microorganisms were metabolically active strongly modified dissolved matter since they able to form consume many compounds. Using Venn diagrams, four fractions compounds...
Secondary organic aerosols (SOA) produced in the atmosphere from sequential oxidation of biogenic or anthropogenic volatile compounds (VOC) represent a significant part atmospheric aerosol. Aerosol particles can act as cloud condensation nuclei be scavenged by droplets, where carbon undergo chemical and biological transformations. Due to its high complexity, nontargeted analysis FT-ICR MS (Fourier-transform ion cyclotron resonance mass spectrometry) has been used characterize dissolved...
Biodegradation is competitive with photochemistry, especially in summer and at night. Formic acid the most impacted compound.
Abstract. A new modelling study of the role transition metal ions on cloud chemistry has been performed. Developments Model Multiphase Cloud Chemistry (M2C2; Leriche et al., 2001) are described, including reactivity emission/deposition processes and variable photolysis in aqueous phase. The model is then applied to three summertime scenarios under urban, remote marine conditions, described by Ervens al. (2003). Chemical regimes clouds analyzed understand especially, HxOy chemistry, which...
A three‐dimensional mesoscale numerical model (Nickerson et al., 1986) with quasi‐spectral microphysics has been extended to include gas and aerosol removal by cloud droplets raindrops. Combining meteorological predictions pollutant scavenging parameterizations, two‐dimensional sensitivity tests have carried out for continental maritime clouds over an idealized topography. Nucleation is the most efficient in‐cloud mechanism; however, differences in droplet spectra between lead their...
Abstract. A new detailed aqueous phase mechanism named the Cloud Explicit Physico-chemical Scheme (CLEPS 1.0) is proposed to describe oxidation of water soluble organic compounds resulting from isoprene oxidation. It based on structure activity relationships (SARs) which provide global rate constants together with branching ratios for HO⋅ abstraction and addition atmospheric compounds. The GROMHE SAR allows evaluation Henry's law undocumented This coupled MCM v3.3.1 gas through a mass...
Abstract Chemical processes in clouds and fogs can substantially alter atmospheric oxidant budgets lead to aerosol mass formation. However, many regional global models do not include detailed aqueous‐phase chemical mechanisms due the (a) lack of complete understanding (b) computational burden adding constituents. Current gas‐aqueous chemistry 0‐dimensional were evaluated a cloud‐chemistry box model intercomparison based on mid‐September 2016 cloud event at Whiteface Mountain, New York....
In order to study scavenging processes of chemical species in mixed phase clouds, in‐cloud field measurements were conducted December 1997 at the Puy de Dôme mountain (center France, 1465 m above sea level). Soluble including NH + 4 , Cl − ;, NO 3− 3 SO HCOO CH COO and C 2 O present different phases (supercooled water droplets, rimed snowflakes, interstitial gases, aerosols) cold clouds have been investigated. Conducted parallel microphysical studies (liquid ice contents, size distribution...
This study investigates the influence of iron dissolution from aerosol particles on cloud chemistry and presents improvements in modeling associated multiphase processes. Iron redox species are important pollutants; they very reactive clouds especially through their interactions with HXOy compounds. Solid phase is transferred into aqueous–phase by dissolution. The rate drives its concentration solid aqueous–phases has been determined laboratory based experiments using an urban standard....
A multiphase chemistry model coupled with a quasi‐spectral microphysical has been applied to measurements from the European Cloud Ice Mountain Experiment campaign quantify formation of strong acids nitrate and sulfate evaluate role processes in redistributing reactive species among different phases (gas versus cloud and/or rain). Significant are found be due reaction pernitric acid sulfite ion. Moreover, acid, because its equilibrium gas phase high solubility, is always available both water...