A5091813518- Atmospheric chemistry and aerosols
- Air Quality Monitoring and Forecasting
- Atmospheric Ozone and Climate
- Odor and Emission Control Technologies
- Air Quality and Health Impacts
- Plant responses to elevated CO2
- Advanced Chemical Sensor Technologies
- Atmospheric and Environmental Gas Dynamics
- Oil Spill Detection and Mitigation
- Atmospheric aerosols and clouds
- Agriculture Sustainability and Environmental Impact
- Soil Carbon and Nitrogen Dynamics
- Vehicle emissions and performance
- Indoor Air Quality and Microbial Exposure
- Water Quality Monitoring and Analysis
- Agriculture and Rural Development Research
- French Urban and Social Studies
- Marine and coastal ecosystems
- Isotope Analysis in Ecology
- Toxic Organic Pollutants Impact
- Environmental Policies and Emissions
- Water Quality Monitoring Technologies
- Insect and Pesticide Research
- Microbial Community Ecology and Physiology
- Plant Ecology and Soil Science
Écologie Fonctionnelle et Écotoxicologie des Agroécosystèmes
2016-2024
Université Paris-Saclay
2016-2024
AgroParisTech
2016-2024
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2020-2024
ParisTech
2024
Centre National de la Recherche Scientifique
2011-2020
Environnements et Paléoenvironnements Océaniques et Continentaux
2015-2020
Université de Bordeaux
2015-2020
Biologie et Gestion des Risques en Agriculture
2019
Institut de Recherches sur la Catalyse et l'Environnement de Lyon
2013-2018
Isoprene is an important reactive gas that produced mainly in terrestrial ecosystems but also marine ecosystems. In the environment, isoprene seawater by various biological processes. Here, we show photosensitized reactions involving sea-surface microlayer lead to production of significant amounts isoprene. It suggested H-abstraction processes are initiated photochemically excited dissolved organic matter which will degrade fatty acids acting as surfactants. This chemical interfacial...
We report on experiments that probe photosensitized chemistry at the air/water interface, a region does not just connect two phases but displays its own specific chemistry. Here, we follow reactions of octanol, proxy for environmentally relevant soluble surfactants, initiated by an attack triplet-state carbonyl compounds, which are themselves concentrated interface presence this surfactant. Gas-phase products determined using PTR-ToF-MS, and those remaining in organic layer ATR-FTIR...
Abstract The sea-surface microlayer (SML) has different physical, chemical and biological properties compared to the subsurface water, with an enrichment of organic matter i.e., dissolved including UV absorbing humic substances, fatty acids many others. Here we present experimental evidence that matter, such as acids, when exposed sunlight, can photosensitize conversion linear saturated at air-water interface into unsaturated functionalized gas phase products (i.e. aldehydes alkenes...
Abstract Microorganisms in soil are known to be a source and sink of volatile organic compounds (VOCs). The role the microbial VOCs on ecosystem regulation has been increasingly demonstrated recent years. Nevertheless, little is about influence community structure diversity VOC emissions. This novel study analyzed effect reduced We found that levels increased emissions from soils, while number different emitted decreased. Furthermore, we Proteobacteria , Bacteroidetes fungi phyla were...
In this study, we evaluated photosensitized chemistry at the air-sea interface as a source of secondary organic aerosols (SOA). Our results show that, in addition to biogenic emissions, abiotic processes could also be important marine boundary layer. Photosensitized production aerosol was studied custom-built multiphase atmospheric simulation chamber. The experimental chamber contained water, humic acid (1-10 mg L(-1)) proxy for dissolved matter, and nonanoic (0.1-10 mM), fatty which formed...
Organosulfates are tracers for secondary organic aerosol (SOA) formation. We propose a new mechanism of organosulfur product formation in the atmosphere, which sulfur dioxide (SO2) reacts directly with alkenes. The experiments were conducted at gas–liquid interface coated-wall flow tube reactor. It was shown, first time, that SO2 efficiently unsaturated bond oleic acid under atmospheric conditions (without ozone), leading to C9 and C18 products. associated uptake coefficients excess 10–6,...
Abstract Photochemistry plays an important role in marine dissolved organic carbon (DOC) degradation, but the mechanisms that convert DOC into volatile compounds (VOCs) remain poorly understood. We irradiated carboxylic acids (C 7 –C 9 ) on a simulated ocean surface with UV light (<320 nm) photochemical flow reactor and transferred VOC products dark ozone reactor. Glyoxal was detected as secondary product from heptanoic, octanoic, nonanoic acid (NA) films, not octanol. Primary glyoxal...
Organic interfaces that exist at the sea surface microlayer or as surfactant coatings on cloud droplets are highly concentrated and chemically distinct from underlying bulk overlying gas phase. Therefore, they may be potentially unique locations for chemical photochemical reactions. Recently, production of volatile organic compounds (VOCs) was reported a nonanoic acid interface however, subsequent secondary aerosol (SOA) particle incapable being observed. We investigated SOA formation due to...
Abstract. Volatile organic compounds (VOCs) contribute to air pollution through the formation of secondary aerosols and ozone extend lifetime methane in atmosphere. Tropospheric VOCs originate 90 % from biogenic sources on a global scale, mainly forests. Crops are also potentially large yet poorly characterized source (30 VOC emissions Europe, mostly oxygenated). In this study, we investigated fluxes over winter wheat field by eddy covariance using PTR-Qi-TOF-MS with high sensitivity mass...
In agriculture, plant protection products (i.e. pesticides) protect crops from pests, weeds and diseases. However, pesticides introduced into our environment can also contaminate the air, partly due to volatilisation after pesticide application. Measuring in field requires trapping techniques, which are costly time-consuming. There is therefore a strong need for metrological developments implement (1) analysers that measure concentrations continuously over short period of time, (2)...
Organic fertilization has been gaining increasing attention in recent years due to its significant soil health benefits and alignment with European environmental agricultural strategies. A considerable percentage (10.4% 2022) of fields across Europe currently incorporate organic fertilizers into their management practices one or two times/year, this proportion is projected increase by 25% 2030. Consequently, the impacts associated fertilization, particularly volatile compounds (VOCs)...
Animal manure is considered a valuable organic fertilizer due to its important nutrient content enhancing soil fertility and plant growth in agriculture. Besides beneficial role as fertilizer, animal represents significant source of volatile compounds (VOCs), playing atmospheric chemistry. Understanding the composition VOCs from crucial for assessing their environmental impact, they can cause air pollution, odors, harm human health ecosystems. Laboratory studies enhance field measurements by...
Abstract. Biogenic volatile organic compounds (BVOCs) play a large role in atmospheric chemistry as they are precursors of ozone and secondary aerosols. However, the analysis their emission croplands is scarce. This work constitutes, to our knowledge, first quantification ecosystem-scale biogenic (BVOC) fluxes exchanged over rapeseed crop field. The experimental campaign took place at FR-Gri ICOS site (near Paris, France) between spring summer 2017, during which BVOC were measured...
Abstract Secondary organic aerosols (SOA) are one of the main sources uncertainty in current understanding Earth’s climate. Agriculture contributes to primary aerosol emissions, but there is no estimate SOA formation from gaseous precursors. Organic waste products such as sewage sludge applied cropland fertilizers. In this work, we show that an unaccounted source nucleation precursors, skatole (C 9 H N). Skatole emission and rates up 1.1 × 10 6 cm −3 s −1 owing ozone reactivity were measured...
Abstract. This study reports NO, NO2 and O3 mixing ratios flux measurements using the eddy covariance method during a 7-month period over an oilseed-rape field, spanning organic mineral fertilisation event. Cumulated NO emissions whole were in agreement with previous studies showed quite low of 0.26 kg N ha−1 emission factor 0.27 %, estimated as ratio between total emitted form input. The higher following August due to conditions favouring nitrification (soil water content around 20 % high...