A5000845350- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Aeolian processes and effects
- Atmospheric and Environmental Gas Dynamics
- Climate variability and models
- Meteorological Phenomena and Simulations
- Air Quality and Health Impacts
- Tropical and Extratropical Cyclones Research
- Air Quality Monitoring and Forecasting
- Ocean Waves and Remote Sensing
- Marine and coastal ecosystems
- Geophysics and Gravity Measurements
- Geology and Paleoclimatology Research
- Oil Spill Detection and Mitigation
- Coastal and Marine Dynamics
- Wind and Air Flow Studies
- African Botany and Ecology Studies
- Fire effects on ecosystems
- Plant Ecology and Soil Science
- Methane Hydrates and Related Phenomena
- Oceanographic and Atmospheric Processes
- Climate Change and Environmental Impact
- Geochemistry and Geologic Mapping
- Ionosphere and magnetosphere dynamics
Laboratoire d'Aérologie
2002-2025
Centre National de la Recherche Scientifique
2015-2025
Laboratoire de l'Atmosphère et des Cyclones
2014-2025
Université Toulouse III - Paul Sabatier
1999-2025
Météo-France
2012-2025
Institut de Recherche pour le Développement
2021-2025
Observatoire des Sciences de l'Univers de la Réunion
2011-2024
Université de Toulouse
2021-2024
University of Reunion Island
2009-2013
Écologie Marine Tropicale des Océans Pacifique et Indien
2013
Abstract. SURFEX is a new externalized land and ocean surface platform that describes the fluxes evolution of four types surfaces: nature, town, inland water ocean. It mostly based on pre-existing, well-validated scientific models are continuously improved. The motivation for building to use strictly identical in high range applications order mutualise research development efforts. can be run offline mode (0-D or 2-D runs) coupled (from mesoscale numerical weather prediction climate models)....
Abstract. This paper presents the Meso-NH model version 5.4. is an atmospheric non hydrostatic research that applied to a broad range of resolutions, from synoptic turbulent scales, and designed for studies physics chemistry. It limited-area employing advanced numerical techniques, including monotonic advection schemes scalar transport fourth-order centered or odd-order WENO momentum. The includes state-of-the-art parameterization are important represent convective-scale phenomena eddies, as...
The African Monsoon Multidisciplinary Analysis (AMMA) is a major international campaign investigating far‐reaching aspects of the monsoon, climate and hydrological cycle. A special observing period was established for dry season (SOP0) with focus on aerosol radiation measurements. SOP0 took place during January February 2006 involved several ground‐based measurement sites across west Africa. These were augmented by aircraft measurements made Facility Airborne Atmospheric Measurements (FAAM)...
Abstract. Recent field studies have found large discrepancies in the measured vs. modeled SOA mass loadings both urban and regional polluted atmospheres. The reasons for these differences are unclear. Here we revisit a case study of formation Mexico City described by Volkamer et al. (2006), during photochemically active period when impact biomass burning is minor or negligible, show that observed increase OA/ΔCO consistent with results from several groups MILAGRO 2006. Then use to evaluate...
Mineral dust aerosols play an important role in the climate system. Coupled climate‐aerosol models are tool with which to quantify fluxes and associated impact. Over last decade or more, numerous have been developed, both global regional, but date, there few attempts compare performance of these models. In this paper a comparison five regional atmospheric modules is made, terms their simulation meteorology, emission transport. The intercomparison focuses on 3‐day event over Bodélé depression...
Abstract. Since the nineties, atmospheric measurement systems have been deployed at Reunion Island, mainly for monitoring composition in framework of NDSC/NDACC (Network Detection Stratospheric Change/Network Atmospheric Composition Change). The location Island presents a great interest because there are very few multi-instrumented stations tropics and particularly southern hemisphere. In 2012, new observatory was commissioned Maïdo 2200 m above sea level: it hosts various instruments...
Abstract. The present work analyses the effect of dust aerosols on surface and top atmosphere radiative budget, temperature, sensible heat fluxes, atmospheric heating rate convective activity over West Africa. study is focused regional impact a major event period 7–14 March 2006 through numerical simulations performed with mesoscale, nonhydrostatic model MesoNH. Due to its importance budgets, specific attention has been paid representation single scattering albedo (SSA) in MesoNH by using...
Several studies have shown the importance of desert dust aerosols in weather forecast models. Nevertheless, has been poorly represented such models and is source some prediction errors, particular for tropical subtropical regions. The purpose this paper to illustrate formation three‐dimensional transport a severe storm which occurred March 2006 over West Africa. An intense haze was transported southward Gulf Guinea thereby generating an aerosol optical thickness (AOT) greater than 4 Nigeria....
Abstract. Aerosol particles are a complex component of the atmospheric system which influence climate directly by interacting with solar radiation, and indirectly contributing to cloud formation. The variety their sources, as well multiple transformations they may undergo during transport (including wet dry deposition), result in significant spatial temporal variability properties. Documenting this is essential provide proper representation aerosols condensation nuclei (CCN) models. Using...
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...
Classical aerosol schemes use either a sectional (bin) or lognormal approach. Both approaches have particular capabilities and interests: the approach is able to describe every kind of distribution, whereas one makes assumption distribution form with fewer number explicit variables. For this last reason we developed three‐moment scheme named ORILAM be coupled in three‐dimensional mesoscale CTM models. This paper presents concept hypothesis range processes such as nucleation, coagulation,...
Several studies have shown the importance of aerosols in Earth's radiative balance. The effect dust has earlier been quantified global and regional climate models. Fewer included prediction online numerical weather (NWP) Predicting is different from including actively because models give average responses over long timescales, whereas purpose to calculate right on short timescales. In this paper, we run a mesoscale NWP with four assumptions aerosols: (1) no dust, (2) climatological data set...
A brightness temperature difference (BTD) technique is used to evaluate the dust and cirrus forecasts of a regional meteorological model. The based on contrasted absorption property at two wavelengths within atmospheric infrared window applied 3‐hourly Meteosat Second Generation (MSG) observations in 10.8‐ 12‐ μ m bands over West Africa. satellite observation coverage Sahara shows well marked diurnal cycle associated with boundary layer activity peaking 15 UTC. similar signature obtained...
Abstract. Nitrogen oxide biogenic emissions from soils are driven by soil and environmental parameters. The relationship between these parameters NO fluxes is highly non linear. A new algorithm, based on a neural network calculation, used to reproduce the linked precipitations in Sahel 6 August 2006 during AMMA campaign. This algorithm has been coupled surface scheme of chemistry dynamics model (MesoNH Chemistry) estimate impact NOx O3 formation lower troposphere for this particular episode....
Abstract. Aerosol properties were measured during an airborne campaign experiment that took place in July 2006 West Africa within the framework of African Monsoon Multidisciplinary Analyses (AMMA). The goal present study was to determine main microphysical processes affect aerosols passage a mesoscale convective system (MCS) over region Niamey Niger. A significant change aerosol profiles before and after MCS found layer located between 1300 3000 m, where concentration drastically decreased...
Abstract. Interest in the potential formation of secondary organic aerosol (SOA) through reactions compounds condensed aqueous phases is growing. In this study, SOA from irreversible aqueous-phase species clouds was investigated. A new proposed chemistry mechanism (AqChem) coupled with existing gas-phase Caltech Atmospheric Chemistry Mechanism (CACM) and Model to Predict Multiphase Partitioning Organics (MPMPO) that simulate formation. AqChem treats lead mainly carboxylic acids, which are...
Abstract. SURFEX is a new externalized land and ocean surface platform that describes the fluxes evolution of four types surface: nature, town, inland water ocean. It can be run either coupled or in offline mode. mostly based on pre-existing, well validated scientific models. used mode (from point scale to global runs) fully with an atmospheric model. able simulate carbon dioxide, chemical species, continental aerosols, sea salt snow particles. also includes data assimilation module. The...
High resolution atmospheric simulations with the AROME model coupled a dust module over West Africa for whole of June 2006 were used to calculate aerosol optical thickness (AOT). Simulations showed significant diurnal cycle 0.2 in AOT that could not be inferred from MODIS Deep Blue retrievals due their timings. Dust sources are mainly driven by breakdown early morning low‐level jet and moist convection afternoon, leading opposite cycles. Also, show cloud cover significantly prevents...
Abstract Ocean‐Waves‐Atmosphere (OWA) exchanges are not well represented in current Numerical Weather Prediction (NWP) systems, which can lead to large uncertainties tropical cyclone track and intensity forecasts. In order explore better understand the impact of OWA interactions on modeling, a fully coupled system based atmospheric model Meso‐NH, oceanic CROCO, wave WW3 called MSWC was designed applied case Bejisa (2013–2014). The simulation shows good agreement with literature available...
A three‐dimensional mesoscale numerical simulation has been performed to investigate the dust emissions over Sahel associated with strong near‐surface winds in region of West African Inter Tropical Discontinuity (ITD) during summer, when ITD is located Niger and Mali around 18°N. The study focuses on period from 2 12 July 2006, framework Monsoon Multidisciplinary Analysis (AMMA) Special Observing Period 2a1. comparison observations suggests that model can be used reliably analyze quantify...
Three‐dimensional mesoscale numerical simulations were performed over Niger in order to investigate dry cyclogenesis the West African intertropical discontinuity (ITD) during summer, when it is located Sahel. The implications of on dust emission and transport Africa are also addressed using model results, together with spaceborne observations from Spinning Enhanced Visible Infra‐Red Imager (SEVIRI) Cloud‐Aerosol Lidar Orthogonal Polarization (CALIOP). study focuses case 7–8 July 2006,...
Abstract. In April 2007, the Piton de la Fournaise volcano (Réunion island) entered into its biggest eruption recorded in last century. Due to absence of a sensors network vicinity volcano, an estimation degassing during paroxysmal phase event has not been performed. Nevertheless, SO2 plume and aerosols have observed by OMI CALIOP space sensors, respectively. The mesoscale chemical model MesoNH-C simulates bulk mass general shape spreading over Indian Ocean. Moreover, analysis budget...
Abstract. Atmospheric processing and CCN formation of Saharan dust is illustrated through the analysis a case transport over northern Europe. This spread investigated by combining satellite, airborne ground-based observations non-hydrostatic meso-scale model Meso-NH. The altitude plume during its to northwestern Europe was assessed using CALIPSO our results. major transported toward Mediterranean European regions between 2 5 km above sea level (a.s.l.). confirmed an average particle...