A5013064781- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Atmospheric aerosols and clouds
- Arctic and Antarctic ice dynamics
- Cryospheric studies and observations
- Air Quality and Health Impacts
- Ocean Acidification Effects and Responses
- Maritime Transport Emissions and Efficiency
- Arctic and Russian Policy Studies
- Air Quality Monitoring and Forecasting
- Marine and coastal ecosystems
- Polar Research and Ecology
- Mercury impact and mitigation studies
- Climate change and permafrost
- Microplastics and Plastic Pollution
- Methane Hydrates and Related Phenomena
- Wind and Air Flow Studies
- Solar Radiation and Photovoltaics
- Geophysics and Gravity Measurements
- Fire effects on ecosystems
- Recycling and Waste Management Techniques
- Vehicle emissions and performance
- Spectroscopy and Quantum Chemical Studies
- Per- and polyfluoroalkyl substances research
Institut polytechnique de Grenoble
2019-2025
Institut de Recherche pour le Développement
2019-2025
Université Grenoble Alpes
2019-2025
Centre National de la Recherche Scientifique
2016-2025
Institut des Géosciences de l'Environnement
2019-2025
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2023-2024
Bolin Centre for Climate Research
2023
Laboratoire atmosphères, milieux, observations spatiales
2012-2021
Université de Versailles Saint-Quentin-en-Yvelines
2012-2021
Sorbonne Université
2011-2021
Abstract. Motivated by the need to predict how Arctic atmosphere will change in a warming world, this article summarizes recent advances made research consortium NETCARE (Network on Climate and Aerosols: Addressing Key Uncertainties Remote Canadian Environments) that contribute our fundamental understanding of aerosol particles as they relate climate forcing. The overall goal has been use an interdisciplinary approach encompassing extensive field observations range chemical transport, earth...
Summertime Arctic shipboard observations of oxygenated volatile organic compounds (OVOCs) such as acids, key precursors climatically active secondary aerosol (SOA), are consistent with a novel source OVOCs to the marine boundary layer via chemistry at sea surface microlayer. Although this has been studied in laboratory setting, acid emissions from microlayer have not previously observed ambient environments. Correlations between measurements OVOCs, including high levels formic acid,...
Abstract The emerging threat of atmospheric microplastic pollution has prompted researchers to study areas previously considered beyond the reach plastic. Investigating range transport is key understanding global extent this problem. While microplastics have been discovered in planetary boundary layer, their occurrence free troposphere relatively unexplored. Confronting important because presence would facilitate over greater distances and thus potential more distal remote parts planet. Here...
Abstract. The anticipated increase in solar energy production West Africa requires high-quality irradiance estimates, which are affected by meteorological conditions and particular the presence of desert dust aerosols. This study examines impact incorporating into surface temperature estimations. research focuses on a case event March 2021, is characteristic dry season Africa. Significant aerosol emissions at Bodélé Depression associated with Harmattan flow that transports plume westwards....
Degenerate hydrogen atom exchange reactions have been studied using calculations, based on density functional theory (DFT), for (i) benzyl radical plus toluene, (ii) phenoxyl phenol, and (iii) methoxyl methanol. The first third occur via transfer (HAT) mechanisms. transition structure (TS) benzyl/toluene has C(2)(h)() symmetry corresponds to the approach of 2p-pi orbital benzylic carbon a toluene. In this TS, in similar C(2) TS methoxyl/methanol exchange, SOMO significant atomic orbitals...
Given the rapid nature of climate change occurring in Arctic and difficulty models have quantitatively reproducing observed changes such as sea ice loss, it is important to improve understanding processes leading this region, including role short-lived pollutants aerosols ozone. It has long been known that pollution produced from emissions at midlatitudes can be transported Arctic, resulting a winter/spring aerosol maximum haze. However, many uncertainties remain about composition origin...
Abstract. Sun-lit snow is increasingly recognized as a chemical reactor that plays an active role in uptake, transformation, and release of atmospheric trace gases. Snow known to influence boundary layer air on local scale, given the large global surface coverage may also be significant regional scales. We present new detailed one-dimensional chemistry module has been coupled 1-D model MISTRA. The module, which dynamically overlaying model, includes heat transport snowpack, molecular...
Abstract. The summertime Arctic lower troposphere is a relatively pristine background aerosol environment dominated by nucleation and Aitken mode particles. Understanding the mechanisms that control formation growth of crucial for our ability to predict cloud properties therefore radiative balance climate. We present an analysis event observed in Canadian Archipelago during summer as part NETCARE project. Under stable clean atmospheric conditions, with low inversion heights, carbon monoxide...
The Arctic is a sentinel of global change. This region influenced by multiple physical and socio-economic drivers feedbacks, impacting both the natural human environment. Air pollution one such driver that impacts climate change, ecosystems health but significant uncertainties still surround quantification these effects. air includes harmful trace gases (e.g. tropospheric ozone) particles black carbon, sulphate) toxic substances polycyclic aromatic hydrocarbons) can be transported to from...
Significance Cold and dry glacial-state climate conditions persisted in the Southern Hemisphere until approximately 17.7 ka, when paleoclimate records show a largely unexplained sharp, nearly synchronous acceleration deglaciation. Detailed measurements Antarctic ice cores document exactly at that time unique, ∼192-y series of massive halogen-rich volcanic eruptions geochemically attributed to Mount Takahe West Antarctica. Rather than coincidence, we postulate halogen-catalyzed stratospheric...
Abstract. Using observations from aircraft, surface stations and a satellite instrument, we comprehensively evaluate multi-model simulations of carbon monoxide (CO) ozone (O3) in the Arctic over lower latitude emission regions, as part POLARCAT Model Inter-comparison Project (POLMIP). Evaluation 11- atmospheric models with chemistry shows that they generally underestimate CO throughout troposphere, largest biases found during winter spring. Negative are also Northern Hemisphere, mean gross...
Abstract. Ice nucleating particles (INPs) in the Arctic can influence climate and precipitation region; yet our understanding of concentrations sources INPs this region remain uncertain. In following, we (1) measured immersion mode Canadian marine boundary layer during summer 2014 on board CCGS Amundsen, (2) determined ratios surface areas mineral dust aerosol to sea spray aerosol, (3) investigated source using particle dispersion modelling. Average at −15, −20, −25 ∘C were 0.005, 0.044,...
Abstract. A model intercomparison activity was inspired by the large suite of observations atmospheric composition made during International Polar Year (2008) in Arctic. Nine global and two regional chemical transport models participated this performed simulations for 2008 using a common emissions inventory to assess differences chemistry schemes. This paper summarizes compares their ozone its precursors presents an evaluation variety surface, balloon, aircraft satellite observations. Each...
Abstract. Continuous hourly measurements of gas-phase ammonia (NH3(g)) were taken from 13 July to 7 August 2014 on a research cruise throughout Baffin Bay and the eastern Canadian Arctic Archipelago. Concentrations ranged 30 650 ng m−3 (40–870 pptv) with highest values recorded in Lancaster Sound (74°13′ N, 84°00′ W). Simultaneous total ammonium ([NHx]), pH temperature ocean melt ponds used compute compensation point (χ), which is ambient NH3(g) concentration at surface–air fluxes change...
Abstract Elevated concentrations of atmospheric bromine are known to cause ozone depletion in the Arctic, which is most frequently observed during springtime. We implement a detailed description and chlorine chemistry within WRF‐Chem 4.1.1 model, two different descriptions Arctic activation: (1) heterogeneous on surface snow sea ice, triggered by deposition (Toyota et al., 2011 https://doi.org/10.5194/acp-11-3949-2011 ), (2) reactions salt aerosols emitted through sublimation lofted blowing...
Abstract Natural aerosols and their interactions with clouds remain an important uncertainty within climate models, especially at the poles. Here, we study behavior of sea salt (SSaer) in Arctic Antarctic 12 models from CMIP6. We investigate driving factors that control SSaer abundances show large differences based on choice source function, representation aerosol processes atmosphere. Close to poles, CMIP6 do not match observed seasonal cycles surface concentrations, likely due absence...
Abstract. The chemical composition of the boundary layer in snow covered regions is impacted by chemistry snowpack via uptake, processing, and emission atmospheric trace gases. We use coupled one-dimensional (1-D) model MISTRA-SNOW to study impact on oxidation capacity layer. includes gas phase photochemistry reactions both interstitial air atmosphere. While it acknowledged that occurring at ice surfaces may consist a true quasi-liquid and/or concentrated brine layer, lack additional...
Abstract We present vertically resolved observations of aerosol composition during pristine summertime Arctic background conditions. The methansulfonic acid (MSA)‐to‐sulfate ratio peaked near the surface (mean 0.10), indicating a contribution from ocean‐derived biogenic sulfur. Similarly, organic (OA)‐to‐sulfate increased toward 2.0). Both MSA‐to‐sulfate and OA‐to‐sulfate ratios were significantly correlated with FLEXPART‐WRF‐predicted air mass residence time over open water,...
Abstract Black carbon (BC) concentrations observed in 22 snowpits sampled the northwest sector of Greenland ice sheet April 2014 have allowed us to identify a strong and widespread BC aerosol deposition event, which was dated accumulated pits from two snow storms between 27 July 2 August 2013. This event comprises significant portion (57% on average across all pits) total over 10 months (July 2013 2014). Here we link this forest fires burning Canada during summer using modeling remote...
Abstract. Dimethyl sulfide (DMS) plays a major role in the global sulfur cycle. In addition, its atmospheric oxidation products contribute to formation and growth of aerosol particles, thereby influencing cloud condensation nuclei (CCN) populations thus formation. The pristine summertime Arctic atmosphere is strongly influenced by DMS. However, DMS mixing ratios have only rarely been measured Arctic. During July–August, 2014, we conducted first high time resolution (10 Hz) ratio measurements...
Abstract. In this study, we quantify the impacts of shipping pollution on air quality and shortwave radiative effect in northern Norway, using WRF-Chem (Weather Research Forecasting with chemistry) simulations combined high-resolution, real-time STEAM2 (Ship Traffic Emissions Assessment Model version 2) emissions. emissions are evaluated airborne measurements from ACCESS (Arctic Climate Change, Economy Society) aircraft campaign, which was conducted summer 2012, two ways. First, nitrogen...
Abstract. Motivated by increasing levels of open ocean in the Arctic summer and lack prior altitude-resolved studies, extensive aerosol measurements were made during 11 flights NETCARE July 2014 airborne campaign from Resolute Bay, Nunavut. Flights included vertical profiles (60 to 3000 m above ground level) over ocean, fast ice, boundary layer clouds fogs. A general conclusion, observations particle numbers between 5 20 nm diameter (N5 − 20), is that ultrafine formation occurs readily...
Abstract. Size-segregated aerosol sulfate concentrations were measured on board the Canadian Coast Guard Ship (CCGS) Amundsen in Arctic during July 2014. The objective of this study was to utilize isotopic composition address contribution anthropogenic and biogenic sources aerosols growth different size fractions atmosphere. Non-sea-salt is divided into using stable isotope apportionment techniques. A considerable amount average concentration fine with a diameter < 0.49 µm from (> 63...