A5051193277- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Vehicle emissions and performance
- Atmospheric and Environmental Gas Dynamics
- Icing and De-icing Technologies
- Aeolian processes and effects
- Marine and coastal ecosystems
- Analytical Chemistry and Sensors
- Geochemistry and Geologic Mapping
- Ocean Acidification Effects and Responses
- Marine Biology and Ecology Research
- nanoparticles nucleation surface interactions
- Arctic and Antarctic ice dynamics
- Spacecraft and Cryogenic Technologies
- Fire effects on ecosystems
- Climate variability and models
- Analytical chemistry methods development
- Advanced Chemical Sensor Technologies
- Odor and Emission Control Technologies
- Astro and Planetary Science
- Meteorological Phenomena and Simulations
- Geophysics and Gravity Measurements
Laboratoire de Météorologie Physique
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Université Clermont Auvergne
2016-2025
École des Mines de Douai
2021
Observatoire de Physique du Globe de Clermont-Ferrand
2011-2018
Arizona State University
2009-2012
University of Edinburgh
2006-2008
Abstract. Organic aerosols (OA) represent one of the major constituents submicron particulate matter (PM1) and comprise a huge variety compounds emitted by different sources. Three intensive measurement field campaigns to investigate aerosol chemical composition all over Europe were carried out within framework European Integrated Project on Aerosol Cloud Climate Air Quality Interactions (EUCAARI) Monitoring Evaluation Programme (EMEP) during 2008 (May–June September–October) 2009...
Abstract In the atmosphere nighttime removal of volatile organic compounds is initiated to a large extent by reaction with nitrate radical (NO 3 ) forming nitrates which partition between gas and particulate phase. Here we show based on particle phase measurements performed at suburban site in Netherlands that contribute substantially mass. Comparisons chemistry transport model indicate most measured are formed NO oxidation. Using aerosol composition data from three intensive observation...
Abstract. This study presents in situ aircraft measurements of Saharan mineral dust transported over the western Mediterranean basin June–July 2013 during ChArMEx/ADRIMED (the Chemistry-Aerosol Experiment/Aerosol Direct Radiative Impact on regional climate MEDiterranean region) airborne campaign. Dust events differing terms source region (Algeria, Tunisia and Morocco), time transport (1–5 days) height were sampled. Mineral above marine boundary layer, which conversely was dominated by...
Organic aerosol (OA) is a key component of total submicron particulate matter (PM1), and comprehensive knowledge OA sources across Europe crucial to mitigate PM1 levels. has well-established air quality research infrastructure from which yearlong datasets using 21 chemical speciation monitors (ACSMs) 1 mass spectrometer (AMS) were gathered during 2013-2019. It includes 9 non-urban 13 urban sites. This study developed state-of-the-art source apportionment protocol analyse long-term spectrum...
Abstract. The Chemistry-Aerosol Mediterranean Experiment (ChArMEx; http://charmex.lsce.ipsl.fr) is a collaborative research program federating international activities to investigate regional chemistry-climate interactions. A special observing period (SOP-1a) including intensive airborne measurements was performed in the framework of Aerosol Direct Radiative Impact on climate MEDiterranean region (ADRIMED) project during dry season over western and central basins, with focus...
Abstract Atmospheric ice nucleating particles (INPs) influence global climate by altering cloud formation, lifetime, and precipitation efficiency. The role of secondary organic aerosol (SOA) material as a source INPs in the ambient atmosphere has not been well defined. Here, we demonstrate potential for biogenic SOA to activate depositional upper troposphere combining field measurements with laboratory experiments. Ambient were measured remote mountaintop location at –46 °C an...
Abstract. Ice crystal formation in mixed-phase clouds is initiated by specific aerosol particles, termed ice-nucleating particles (INPs). Only a tiny fraction of all are INPs, providing challenge for contemporary INP measurement techniques. Models have shown that the presence INPs can impact their radiative properties and induce precipitation formation. However, qualified implementation models, techniques able to accurately detect temperature-dependent concentration needed. Here we present...
Particles containing potassium salts are common in biomass burning plumes and include compounds such as KCl, KNO 3 , K 2 SO 4 . We determined the deliquescence efflorescence relative humidities of single- multi-component using an environmental transmission electron microscope scanning microscope. KCl particles deliquesced at a humidity (RH) 85% effloresced 56%. 96% 60%. grew continuously with increasing humidity. If were heat-treated 104°C overnight, they RH above 90%. Atomized solutions...
BackgroundExposure to fine particulate air pollution is associated with increased cardiovascular morbidity and mortality. We previously demonstrated that exposure dilute diesel exhaust causes vascular dysfunction in humans.ObjectivesWe conducted a study determine whether ambient matter dysfunction.MethodsTwelve male patients stable coronary heart disease 12 age-matched volunteers were exposed concentrated ultrafine particles (CAPs) or filtered for 2 hr using randomized, double-blind...
Abstract. Detailed investigations of the chemical and microphysical properties atmospheric aerosol particles were performed at puy-de-Dôme (pdD) research station (1465 m) in autumn (September October 2008), winter (February March 2009), summer (June 2010) using a compact Time-of-Flight Aerosol Mass Spectrometer (cToF-AMS). Over three campaigns, average mass concentrations non-refractory submicron ranged from 10 μg m−3 up to 27 m−3. Highest nitrate ammonium measured during periods when marine...
The formation of new atmospheric particles involves an initial step forming stable clusters less than a nanometre in size (<~1 nm), followed by growth into quasi-stable aerosol few nanometres (~1-10 nm) and larger (>~10 nm). Although at times, the same species can be responsible for both processes, it is thought that more generally each comprises differing chemical contributors. Here, we present novel analysis measurements from unique multi-station ground-based observing system which reveals...
Abstract. The MEGAPOLI (Megacities: Emissions, urban, regional and Global Atmospheric POLlution climate effects, Integrated tools for assessment mitigation) experiment took place in July 2009. aim of this campaign was to study the aging reactions aerosol gas-phase emissions city Paris. Three ground-based measurement sites several mobile platforms including instrument equipped vehicles ATR-42 aircraft were involved. We present here variations particle- species over Paris, using a combination...
Abstract. We evaluated a modified VBS (volatility basis set) scheme to treat biomass-burning-like organic aerosol (BBOA) implemented in CAMx (Comprehensive Air Quality Model with extensions). The updated was parameterized novel wood combustion smog chamber experiments using hybrid framework which accounts for mixture of burning precursors and their further functionalization fragmentation the atmosphere. new one winter EMEP intensive campaigns (February–March 2009) against mass spectrometer...
This work describes results obtained from the 2016 Aerosol Chemical Speciation Monitor (ACSM) intercomparison exercise performed at Calibration Center (ACMCC, France). Fifteen quadrupole ACSMs (Q_ACSM) European Research Infrastructure for observation of Aerosols, Clouds and Trace gases (ACTRIS) network were calibrated using a new procedure that acquires calibration data under same operating conditions as those used during sampling hence gets information representative instrument performance....
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...
Internally mixed aerosol particles consisting of one or more hygroscopic compounds can contain both solid and liquid parts, the details depending on relative humidity (RH). The solid‐to‐liquid transition such as RH increases influences their light‐scattering properties through changes in particle shape, size, refractive index. Most techniques used to analyze ambient do not have ability view phases within individual particles. Using a transmission electron microscope fitted with an...
Sea‐salt aerosol (SSA) particles affect the Earth's radiative balance and moderate heterogeneous chemistry in marine boundary layer. Using conventional environmental transmission electron microscopes (ETEM), we investigated hygroscopic growth liquid‐layer compositions of generated from three types aqueous salt solutions: sodium chloride, laboratory‐synthesized seawater (S‐SSA particles), natural (N‐SSA particles). Three levels morphological change were observed with ETEM as...
Abstract. Cloud condensation nuclei (CCN) size distributions and numbers were measured for the first time at Puy-de-Dôme high altitude (1465 m a.s.l) site in Central France. Majority of measurements done constant supersaturation (SS) 0.24%, which was also deduced to be representative typical in-cloud SS site. CCN during summer ranged from about 200 up 2000 cm−3 winter 50 3000 cm−3. Variability number explained by both particle chemistry distribution variability. The higher concentrations...
Abstract. Total bacteria, fungal spore and yeast counts were compared with ultraviolet-light-induced fluorescence (UV-LIF) measurements of ambient aerosol at the summit Puy de Dôme (PdD) mountain in central France (1465 m a.s.l), which represents a background elevated site. Bacteria, spores enumerated by epifluorescence microscopy (EFM) found to number 2.2 23 L−1 0.8 2 L−1, respectively. Bacteria on two successive nights an order magnitude larger than intervening day. A wide issue bioaerosol...
Abstract. The formation of new aerosol particles in the atmosphere is a key process influencing number concentration as well climate, particular at high altitude, where newly formed directly influence cloud formation. However, free tropospheric particle (NPF) poorly documented due to logistic limitations and complex atmospheric dynamics around high-altitude stations that make observation this day-time challenging. Recent improvements measurement techniques now possible detection neutral...
Abstract One pathway by which the oceans influence climate is via emission of sea spray that may subsequently cloud properties. Sea emissions are known to be dependent on atmospheric and oceanic physicochemical parameters, but potential role ocean biology fluxes remains poorly characterized. Here we show a consistent significant relationship between seawater nanophytoplankton cell abundances sea-spray derived Cloud Condensation Nuclei (CCN) number fluxes, generated using water from three...
During the North Atlantic marine boundary layer experiment (NAMBLEX) sampling campaign at Mace Head, Ireland, both continental and maritime air masses were sampled. Aerosol was characterized with a TSI 3800 time-of-flight mass spectrometer (ATOFMS) MOUDI microorifice impactor, particle number counts measured independently an aerodynamic sizer. The data have been analyzed in order to elucidate factors determining detection efficiencies of ATOFMS. These are broken down according efficiency...
The influence of drying rate on the dynamic shape factor χ NaCl particles was investigated. at efflorescence relative humidity (ERH) 45% controlled in a laminar flow tube and varied from 5.5 ± 0.9 to 101 3 RH s–1 ERH, where represents one percent unit humidity. Dry having mobility diameters 23–84 nm were studied, corresponding aqueous 37–129 (57%) prior drying. At each diameter rate, critical supersaturation cloud-condensation activation also measured. combined an analysis determine value χ....