A5030403236- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Meteorological Phenomena and Simulations
- Atmospheric Ozone and Climate
- Aeolian processes and effects
- Wind and Air Flow Studies
- Precipitation Measurement and Analysis
- Air Quality and Health Impacts
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Climate variability and models
- Vehicle emissions and performance
- Geophysics and Gravity Measurements
- Particle Dynamics in Fluid Flows
- Air Traffic Management and Optimization
- Oil Spill Detection and Mitigation
- Advanced Aircraft Design and Technologies
- UAV Applications and Optimization
- Marine and coastal ecosystems
- Ocean Waves and Remote Sensing
- Geochemistry and Geologic Mapping
- Water Quality and Pollution Assessment
- Marine Biology and Ecology Research
- Aerospace and Aviation Technology
- Ocean Acidification Effects and Responses
Centre National de la Recherche Scientifique
2015-2024
Centre National de Recherches Météorologiques
2013-2024
Météo-France
2015-2024
Université de Toulouse
2019-2024
Data from the undisturbed period of Rain in Cumulus over Ocean (RICO) field study are used to create a test case for large-eddy simulations shallow, precipitating, trade-wind cumulus.Measurements upon which based augmented by regional scale downscaling meteorological analyses so as provide forcing data consistent with measurements.Twelve simulations, wide range microphysical representations, compared each other, and independent measurements during RICO.The ensemble average plausibly...
Abstract The Aerosol, Radiation and Clouds in southern Africa (AEROCLO-sA) project investigates the role of aerosols on regional climate Africa. This is a unique environment where natural anthropogenic semipermanent widespread stratocumulus (Sc) cloud deck are found. aims to understand dynamical, chemical, radiative processes involved aerosol–cloud–radiation interactions over land ocean under various meteorological conditions. AEROCLO-sA field campaign was conducted August September 2017...
The second Dynamics and Chemistry of Marine Stratocumulus (DYCOMS-II) field study is described. program consisted nine flights in marine stratocumulus west-southwest San Diego, California. objective the was to better understand physics a n d dynamics stratocumulus. Toward this end special flight strategies, including predominantly nocturnal flights, were employed optimize estimates entrainment velocities at cloud-top, large-scale divergence within boundary layer, drizzle processes cloud,...
Thermodynamical and microphysical measurements collected in convective clouds are examined within the frame of homogeneous/inhomogeneous mixing concept, to determine how entrainment-mixing processes affect cloud droplets, their number concentration, mean size. The three selected case studies—one stratocumulus layer two cumulus clouds—exhibit very different values updraft intensity, adiabatic droplet volume diameter, saturation deficit environment, all parameters that expected govern response...
Data from nine stratocumulus clouds in the northeastern Pacific Ocean were analyzed to determine effect of aerosol particles on cloud microphysical and radiative properties. Seven nighttime two daytime cases included. The number concentration below‐cloud (>0.10 μm diameter) was highly correlated with droplet concentration. Droplet concentrations typically about 75% particle range studied (≤400 cm −3 ). Particle anticorrelated size liquid water content drizzle‐sized drops. Radiative impact...
Abstract The European Union (EU)-funded project Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa (DACCIWA) investigates the relationship between weather, climate, and air pollution southern Africa—an area with rapid population growth, urbanization, an increase anthropogenic aerosol emissions. over this region contains a unique mixture of natural gases, liquid droplets, particles, emitted environment which multilayer clouds frequently form. These exert large influence on local...
Abstract Aircraft flights through stratocumulus clouds (Sc) during the Dynamics and Chemistry of Marine Stratocumulus II (DYCOMS-II) study off California coast found narrow in-cloud regions with less liquid water content (LWC) cooler temperatures than average background values. The are named cloud holes assumed to be a result evaporated by entrainment dryer air from above Sc. While such features have been noted previously, this provided unique opportunity investigate in much greater detail...
Abstract. Comprehensive field campaigns dedicated to fog life cycle observation were conducted during the winters of 2010–2013 at Instrumented Site for Atmospheric Remote Sensing Research (SIRTA) observatory in a suburb Paris. In order document their properties, situ microphysical measurements collected 23 events induced by both radiative cooling and stratus lowering are examined here. They reveal large variability number, concentration size aerosol background before onset droplets according...
Abstract Direct and semi‐direct radiative effects of biomass burning aerosols (BBA) from southern central African fires are still widely debated, in particular because climate models have been unsuccessful reproducing the low single scattering albedo BBA over eastern Atlantic Ocean. Using state‐of‐the‐art airborne situ measurements Mie simulations, we demonstrate that well‐aged plumes West Africa results presence strongly absorbing refractory black carbon (rBC), whereas brown contribution to...
Abstract. Southern West Africa (SWA) is an African pollution hotspot but a relatively poorly sampled region of the world. We present overview in situ aerosol optical measurements collected over SWA June and July 2016 as part DACCIWA (Dynamics-Aerosol-Chemistry-Clouds Interactions Africa) airborne campaign. The aircraft wide range air masses, including anthropogenic plumes emitted from coastal cities, long-range transported biomass burning central southern dust Sahara Sahel region, well...
Abstract. This paper investigates the potential benefit of ground-based microwave radiometers (MWRs) to improve initial state (analysis) current numerical weather prediction (NWP) systems during fog conditions. To this end, temperature, humidity and liquid water path (LWP) retrievals have been performed by directly assimilating brightness temperatures using a one-dimensional variational technique (1D-Var). study focuses on fog-dedicated field-experiment over winter 2016–2017 in France. In...
Abstract This study investigates thermal circulations on Reunion Island (21°07’S 55°32’E), focusing the complex terrain of region. Observations from BIO‐MAÏDO campaign, along with 2 days high‐resolution simulation using MesoNH model, were analyzed to understand thermally‐driven mechanisms. was conducted a horizontal resolution 100 m and employed vertically stretched grid, achieving 1 at lowest levels. Two distinct wind regimes identified, characterized by katabatic flows prevailing within 30...
Abstract. Cloud radiative transfer calculations in general circulation models involve a link between cloud microphysical and optical properties. Indeed, the liquid water content expresses as function of mean volume droplet radius, while light extinction is their surface radius. There small difference these two parameters because spectrum width. This issue has been addressed by introducing an empirical multiplying correction factor to concentration. Analysis situ sampled data, however,...
Abstract. Fog-induced visibility reduction is responsible for a variety of hazards in the transport sector. Therefore there large demand an improved understanding fog formation and thus forecasts. Improved forecasts require better numerous complex mechanisms during life cycle. During winter 2012/13 field campaign called ParisFog aiming at research took place SIRTA (Instrumented Site Atmospheric Remote Sensing Research). located about 20 km southwest Paris city center, France, semi-urban...
Abstract. Parametric functions are currently used to represent droplet spectra in clouds and develop bulk parameterizations of the microphysical processes their interactions with radiation. The most frequently parametric Lognormal Generalized Gamma which have three four independent parameters, respectively. In a parameterization, two parameters constrained by total number concentration liquid water content. function, one parameter is specified priori, fourth one, like third shall be tuned,...
Abstract. While atmospheric new particle formation (NPF) has been observed in various environments and was found to contribute significantly the total aerosol concentration, production of particles over open seas is poorly documented literature. Nucleation events were detected analysed Mediterranean Sea using two condensation counters a scanning mobility sizer on board ATR-42 research aircraft during flights conducted between 11 September 4 November 2012 framework HYMEX (HYdrological cycle...
Fog water deposition can represent an important part of the atmospheric water, nutrient and pollutant inputs in specific areas such as mountainous or coastal regions (Shimadera et al., 2011). In order to determine potential fog on plants, a field experiment has been performed northeast France droplet velocity different types plants. The main objective is improve models by enabling them accurately account for from low clouds at ground level. flux deposited was estimated exposing plants...
Abstract. The evolution of the droplet size distribution (DSD) during fog life cycle remains poorly understood and progress is required to reduce uncertainty forecasts. To gain insights into physical processes driving microphysical properties, intensive field campaigns were conducted winters 2010–2013 at Instrumented Site for Atmospheric Remote Sensing Research (SIRTA) in a semi-urban environment southwest Paris city center monitor simultaneous variations properties their potential...
Abstract. As part of the Dynamics-Aerosol-Chemistry-Cloud Interactions in West Africa (DACCIWA) project, an airborne campaign was designed to measure a large range atmospheric constituents, focusing on effect anthropogenic emissions regional climate. The presented study details results French ATR42 research aircraft, which aimed characterize gas-phase, aerosol and cloud properties region during field carried out June/July 2016 combination with German Falcon 20 British Twin Otter aircraft....
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 Marine ecosystems are important drivers of the global climate system. They emit volatile species into atmosphere, involved in complex reaction cycles that influence lifetime greenhouse gases. Sea spray and marine biogenic aerosols affect Earth's by scattering solar radiation controlling cloud microphysical properties. Here we show larger than expected emissions butenes, three orders magnitude higher dimethyl sulfide, produced coastal part Benguela upwelling system, one most...
Abstract. The west coast of southern Africa is a region particular climate interest and crossroad for aerosols different origins as well fog occurrences. In this study, we present comparison between the solubility trace metals in pairs total suspended particulate (TSP) water samples collected Henties Bay, Namibia, during AErosols, Radiation CLOuds (AEROCLO-sA) field campaign September 2017. From inductively coupled plasma mass spectrometry measurements, found that Al, Fe, Ni, Cu, Cr have...