A5056069835- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Indoor Air Quality and Microbial Exposure
- Air Quality Monitoring and Forecasting
- Microbial Community Ecology and Physiology
- Algal biology and biofuel production
- Polar Research and Ecology
- Aeolian processes and effects
- Plant responses to elevated CO2
- Marine and coastal ecosystems
- Biocrusts and Microbial Ecology
- Paranormal Experiences and Beliefs
- Toxic Organic Pollutants Impact
- Groundwater and Isotope Geochemistry
- Marine Biology and Ecology Research
- Isotope Analysis in Ecology
- Geochemistry and Geologic Mapping
- Geophysics and Gravity Measurements
- Marine and coastal plant biology
- Oil Spill Detection and Mitigation
- Protist diversity and phylogeny
- Earthquake Detection and Analysis
Institut de Chimie de Clermont-Ferrand
2012-2024
Centre National de la Recherche Scientifique
2011-2024
Université Clermont Auvergne
2009-2024
Laboratoire de Météorologie Physique
2010-2024
Géosciences Montpellier
2021-2024
Centre de Géosciences
2023
Sigma Clermont
2019-2020
Université des Antilles
2019-2020
Louisiana State University
2014-2019
Observatoire de Physique du Globe de Clermont-Ferrand
2012-2017
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. 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 biodegradation of the most abundant atmospheric organic C 1 to 4 compounds (formate, acetate, lactate, succinate) by five selected representative microbial strains (three Pseudomonas strains, one Sphingomonas strain, and yeast strain) isolated from cloud water at puy de Dôme has been studied. Experiments were first conducted under model conditions consisted a pure strain incubated in presence single compound. Kinetics showed ability isolates degrade temperatures low-altitude...
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...
Abstract. The objective of this work was to compare experimentally the contribution photochemistry vs. microbial activity degradation carboxylic acids present in cloud water. For this, we selected 17 strains representative microflora existing real clouds and worked on two distinct artificial media that reproduce marine continental chemical composition. Photodegradation experiments with hydrogen peroxide (H2O2) as a source hydroxyl radicals were performed under same microcosm conditions using...
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...
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...
Abstract. The Forests gAses aeRosols Clouds Exploratory (FARCE) campaign was conducted in March–April 2015 on the tropical island of La Réunion. For first time, several scientific teams from different disciplines collaborated to provide reference measurements and characterization Réunion vegetation, volatile organic compounds (VOCs), biogenic VOCs (BVOCs), (bio)aerosols composition clouds, with a strong focus Maïdo mountain slope area. main observations obtained during this 2-month intensive...
Abstract. We present here the results obtained during an intensive field campaign conducted in framework of French “BIO-MAÏDO” (Bio-physico-chemistry tropical clouds at Maïdo (Réunion Island): processes and impacts on secondary organic aerosols' formation) project. This study integrates exhaustive chemical microphysical characterization cloud water March–April 2019 Réunion (Indian Ocean). Fourteen samples have been collected along slope this mountainous island. Comprehensive these is...
Abstract. In situ cloud studies are fundamental to study the variability in chemical and biological composition as a function of environmental conditions assess their potential for transforming compounds. To achieve this objective, water collectors have been developed recent decades recover from clouds fogs using different designs collection methods. study, new active ground-based collector was tested sampling microbiology chemistry. This instrument, BOOGIE, is mobile sampler that easy...
The particles most effective at inducing the freezing of water in atmosphere are microbiological origin; however, information on species harboring this phenotype, their environmental distribution, and ecological sources very limited. Analysis precipitation collected over 2 years Louisiana showed that INPs active warmest temperatures were sourced from terrestrial ecosystems displayed behaviors implicated specific bacterial taxa as source ice nucleation activity. abundance biological was...
Concentrations of 33 metal elements were determined by ICP-MS (Inductively Coupled Plasma Mass Spectrometry) analysis for 24 cloud water samples (corresponding to 10 events) collected at the puy de Dôme station. Clouds present contrasted chemical composition with mainly marine and continental characteristics; some events, a further anthropogenic source can be superimposed on background level. In this context, measurements trace metals may help evaluate impact natural sources better...
Abstract. The composition of dissolved organic matter cloud water has been investigated through non-targeted high-resolution mass spectrometry on only a few samples that were mostly collected in the Northern Hemisphere USA, Europe and China. There remains, therefore, lack measurements for clouds located Southern Hemisphere, under tropical conditions influenced by forest emissions. As fact, comparison different locations is challenging since methodology analysis data treatment not...
Abstract. Cloud/fog droplets comprise a myriad of chemical compounds and are living environments in which microorganisms present active. These biological elements can evolve various ways within the cloud system, aqueous transformation chemicals contributes to atmospheric chemistry. In situ studies fundamental this sense, because they enable us study variability composition as function environmental conditions assess their potential for transforming compounds. To achieve objective, water...
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. Physico-chemical parameters, as well concentrations major organic inorganic constituents, were measured analyzed by multi-component statistical analysis. Along with corresponding back-trajectory plots, this allowed distinguishing four different categories air masses reaching summit pdD:...
Abstract. The BIO-MAÏDO (Bio-physicochemistry of tropical clouds at Maïdo (Réunion Island): processes and impacts on secondary organic aerosols formation) campaign was conducted from the 13th March to 4th April 2019 Réunion Island implied several scientific teams state-of-the-art instrumentation. part project with main objective is improve our understanding cloud formation (SOA) biogenic volatile compounds (BVOC) precursors in a environment. Instruments were deployed five sites: receptor...
Microorganisms have recently been found in cloudwaters as biocatalysts that are able to transform chemical compounds present this medium. The metabolic activities of microorganisms now considered a potential alternative route reactivity. This chapter focuses on duality: reactivity versus biocatalysis. First, the and microbiological compositions clouds described. Second, transformations involving oxidation processes Abiotic based by radicals resulting from presence oxidants aqueous phase...