A5081172309- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Marine and coastal ecosystems
- Atmospheric and Environmental Gas Dynamics
- Maritime Transport Emissions and Efficiency
- Vehicle emissions and performance
- Radioactive contamination and transfer
- Indoor Air Quality and Microbial Exposure
- Advanced Chemical Sensor Technologies
- Air Quality and Health Impacts
- Water Quality Monitoring and Analysis
- Oil Spill Detection and Mitigation
- Gas Sensing Nanomaterials and Sensors
- Microplastics and Plastic Pollution
- Methane Hydrates and Related Phenomena
- Atmospheric aerosols and clouds
- Odor and Emission Control Technologies
- Isotope Analysis in Ecology
- Photochemistry and Electron Transfer Studies
- Hygrothermal properties of building materials
- Mercury impact and mitigation studies
- Photodynamic Therapy Research Studies
- Ocean Acidification Effects and Responses
- Environmental Policies and Emissions
Centre de recherche Inria Lille - Nord Europe
2022-2025
Institut Mines-Télécom
2023-2024
Université de Lille
2023-2024
IMT Nord Europe
2017-2023
University of York
2018-2021
Centre National de la Recherche Scientifique
2014-2017
Institut de Recherches sur la Catalyse et l'Environnement de Lyon
2014-2017
Université Claude Bernard Lyon 1
2014-2017
Catalytic Materials (United States)
2015-2016
Active fatty acid layers Saturated acids are considered to be inert, but they can surprisingly reactive when present as a coating at an air-water interface. Rossignol et al. show that nonanoic is photochemically active it monolayer on water surface (see the Perspective by Vaida). Fatty ubiquitous in environment, and their photochemical processing could have substantial impact local ozone particle formation. Science , this issue p. 699 ; see also 650
In recent years, it has been proposed that gas phase glyoxal could significantly contribute to ambient organic aerosol (OA) mass through multiphase chemistry. Of particular interest is the reaction between and ammonium cations producing light-absorbing compounds such as imidazole derivatives. It was recently shown imidazole-2-carboxaldehyde (IC) can act a photosensitizer, initiating growth in presence of gaseous volatile compounds. Given potential importance this new photosensitized pathway...
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...
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,...
Interfaces are ubiquitous in the environment and many atmospheric key processes, such as gas deposition, aerosol, cloud formation are, at one stage or another, strongly impacted by physical chemical processes occurring interfaces. Here, photoinduced chemistry of an air/water interface coated with nonanoic acid—a fatty acid surfactant we use a proxy for chemically complex natural aqueous surface microlayers—was investigated source volatile semivolatile reactive organic species. The carboxylic...
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...
Abstract. Iodide in the sea-surface plays an important role Earth system. It modulates oxidising capacity of troposphere and provides iodine to terrestrial ecosystems. However, our understanding its distribution is limited due a paucity observations. Previous efforts generate global distributions have generally fitted iodide observations relatively simple functions using proxies for such as nitrate temperature. This approach fails account coastal influences variation bio-geochemical...
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 The marine iodine cycle has significant impacts on air quality and atmospheric chemistry. Specifically, the reaction of iodide with ozone in top few micrometres surface ocean is an important sink for tropospheric (a pollutant gas) dominant source reactive to atmosphere. Sea parameterisations are now being implemented models, but these currently a major uncertainty. Relatively little observational data available estimate global concentrations, this not hitherto been openly collated,...
Volatile Organic Compounds (VOCs), from anthropogenic or biogenic sources, participate in the formation of ozone and particulate matter (PM), impacting health, climate, ecosystems. They can also be directly harmful, particular VOCs such as vinyl chloride monomer (chloroethene), benzene 1-3-butadiene, that are carcinogenic.1 In southern region France, French thresholds for (240 &#181;g m&#179; hourly) PM2.5 (10 annual) regularly exceeded. A 2018-study showed an exceedance O3 on 144...
Exhaust gases and particles from ships are a significant growing contributor to the total emissions transport. Globally, sector is global of NOx SO2.1,2 Recently, International Maritime Organisation (IMO) has reduced sulphur content marine fuels globally through Annex VI MARPOL, further restricted in specific Sulphur Emission Control Areas (SECA), such as English Channel between France UK. Similarly, emission limits have been set for built after 2016 (NECA).However, other pollutants Volatile...
Sub-micron aerosols are primarily consisted of organics, sulfate, nitrate, ammonium etc. and among which organics have high complexity in its chemical physical characteristics. In the present study, aerosol volatility non-refractory sub-micron was extensively studied during 6th &#8211; 20th February 2021 utilizing high-resolution Time flight Aerosol Mass Spectrometer (HR-TOF AMS) coupled with Thermal denuder. The temperature set to 150oC denuded non-denuded ambient then sampled a...
The Surface Ocean-Lower Atmosphere Study (SOLAS) is a global research network dedicated to advancing coupled oceanographic and atmospheric science, field that requires both interdisciplinary globally distributed expertise. Since 2004, SOLAS has fostered an international scientific community through coordinated science capacity sharing activities. This paper outlines how 3.0 (2026–2035) will build on this legacy by further prioritizing diversity, equity, inclusion, expanding strengthening at...
Abstract An ocean iodine cycling model is presented, which predicts upper speciation. The comprises a three‐layer advective and diffusive circulation of the an embedded within this circulation. two primary reservoirs are represented, iodide iodate. Iodate reduced to in mixed layer association with production, linked by carbon (I:C) ratio. A satisfactory fit observations cannot be obtained globally constant I:C ratio, best when ratio dependent on sea surface temperature, increasing at low...
Abstract. Iodine chemistry has noteworthy impacts on the oxidising capacity of marine boundary layer (MBL) through depletion ozone (O3) and changes to HOx (OH∕HO2) NOx (NO∕NO2) ratios. Hitherto, studies have shown that reaction atmospheric O3 with surface seawater iodide (I−) contributes flux iodine species into MBL mainly as hypoiodous acid (HOI) molecular (I2). Here, we present first concomitant observations oxide (IO), in gas phase, sea concentrations. The results from three field...
The influence of organic compounds on iodine (I2) emissions from the O3 + I– reaction at sea surface was investigated in laboratory and modeling studies using artificial solutions, natural subsurface seawater (SSW), and, for first time, samples microlayer (SML). Gas-phase I2 measured directly above liquid broadband cavity enhanced absorption spectroscopy. were consistently lower (AS) than buffered potassium iodide (KI) solutions. Natural showed strongest reduction compared to solutions with...
The surface ocean is the main source of iodine to atmosphere, where it plays a crucial role including in catalytic removal tropospheric ozone. availability oceanic governed by its biogeochemical cycling, controls which are poorly constrained. Here we show near two-year time series primary species, iodide, iodate and dissolved organic (DOI) inner shelf marine waters Western English Channel (UK). median ± standard deviation concentrations between November 2019 September 2021 (n=76) were:...
A growing portion of scientists realises the need to not only alert about climate change, but also change their professional practices. range tools have emerged promote more sustainable activities, yet many struggle go beyond simple awareness-raising create concrete transition actions. Here we propose a game-based support system MaTerre180’ , which has been designed build scenarios greenhouse gas (GHG) emission reductions in academic community. After providing common scientific background...
Observations of iodine oxide (IO) were made in the Indian Ocean and Southern marine boundary layer (MBL) during 8th Expedition. IO was observed almost ubiquitously open ocean with larger mixing ratios south Polar Front (PF). Contrary to previous reports, not positively correlated sea surface temperature (SST)/salinity, or negatively chlorophyll a . Over whole expedition, SST showed weak negative correlation respect while chl correlated. North PF, strong positive IO. The computed HOI I 2...