A5062825693- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Meteorological Phenomena and Simulations
- Aeolian processes and effects
- Climate variability and models
- Air Quality and Health Impacts
- Remote Sensing and LiDAR Applications
- COVID-19 impact on air quality
- Fire effects on ecosystems
- Wind and Air Flow Studies
- Forest ecology and management
- Calibration and Measurement Techniques
- Ocean Waves and Remote Sensing
- Forest Ecology and Biodiversity Studies
- Water Quality Monitoring and Analysis
- Spectroscopy and Laser Applications
- Geochemistry and Geologic Mapping
- Forest Insect Ecology and Management
- Satellite Image Processing and Photogrammetry
- Oil Spill Detection and Mitigation
- Ionosphere and magnetosphere dynamics
- Cryospheric studies and observations
Laboratoire Interuniversitaire des Systèmes Atmosphériques
2016-2025
Université Paris-Est Créteil
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Université Paris Cité
2016-2025
Laboratoire Techniques, Territoires et Sociétés
2016-2025
Paris-Est Sup
2021-2024
Goddard Space Flight Center
2024
Laboratoire de Météorologie Dynamique
2004-2023
Institut Pierre-Simon Laplace
2007-2023
Centre National d'Études Spatiales
2022
The Tropospheric Ozone Assessment Report (TOAR) is an activity of the International Global Atmospheric Chemistry Project. This paper a component report, focusing on present-day distribution and trends tropospheric ozone relevant to climate global atmospheric chemistry model evaluation. Utilizing TOAR surface database, several figures present daytime average at 2702 non-urban monitoring sites, highlighting regions seasons world with greatest levels. Similarly, ozonesonde commercial aircraft...
From the earliest observations of ozone in lower atmosphere 19th century, both measurement methods and portion globe observed have evolved changed. These different uncertainties biases, data records differ with respect to coverage (space time), information content, representativeness. In this study, various datasets are reviewed selected for inclusion historical record background levels, based on relationship technique modern UV absorption standard, absence interfering pollutants,...
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)...
Advanced inversion Multi-term approach utilizing multiple a priori constraints is proposed. The used as base for the first unified algorithm GRASP that applicable to diverse remote sensing observations and retrieving variety of atmospheric properties. utilization demonstrated.
Abstract The underwater Hunga Tonga-Hunga Ha-apai volcano erupted in the early hours of 15th January 2022, and injected volcanic gases aerosols to over 50 km altitude. Here we synthesise satellite, ground-based, situ radiosonde observations eruption investigate strength stratospheric aerosol water vapour perturbations initial weeks after quantify net radiative impact across two species using offline transfer modelling. We find that produced largest global perturbation since Pinatubo 1991...
Abstract. Ground-based remote sensing observatories have a crucial role to play in providing data improve our understanding of atmospheric processes, test the performance models, and develop new methods for future space-borne observations. Institut Pierre Simon Laplace, French research institute environmental sciences, created Site Instrumental de Recherche par Télédétection Atmosphérique (SIRTA), an observatory with these goals mind. Today SIRTA, located 20km south Paris, operates suite...
Abstract The Saharan atmospheric boundary layer (SABL) plays a significant role in the global circulation and directly affects vertical redistribution of dust originated Sahara, world's largest source. Recent measurements have revealed variety new dynamical mechanisms that control structure SABL, which are responsible for exchange between convective residual layers. Using space‐borne laser remote sensing data (CALIPSO) recently published results, we provide an overview following known...
Abstract. We present a new multispectral approach for observing lowermost tropospheric ozone from space by synergism of atmospheric radiances in the thermal infrared (TIR) observed IASI (Infrared Atmospheric Sounding Interferometer) and earth reflectances ultraviolet (UV) measured GOME-2 (Global Ozone Monitoring Experiment-2). Both instruments are onboard series MetOp satellites (in orbit since 2006 expected until 2022) their scanning capabilities offer global coverage every day, with...
Abstract. The eruption of the Icelandic volcano Eyjafjallajökull in April–May 2010 represents a "natural experiment" to study impact volcanic emissions on continental scale. For first time, quantitative data about presence, altitude, and layering cloud, conjunction with optical information, are available for most parts Europe derived from observations by European Aerosol Research Lidar NETwork (EARLINET). Based multi-wavelength Raman lidar systems, EARLINET is only instrument worldwide that...
This study investigates the underlying atmospheric dynamics associated with intense dust storms in summer 2018 over Arabian Peninsula (AP); a major source at global scale. It reports, for first time, on formation of cyclone Empty Quarter Desert as important mechanism this region. The direct and semi-direct radiative forcings are observed, time region, using high-resolution in-situ CERES-SYN satellite observational data. three-dimensional structure evolution inferred from state-of-the-art...
Abstract This study investigates the atmospheric dynamics of major dust storm that occurred in June 2020 over Sahara and during which clouds associated with highest‐on‐record aerosol optical depths were transported toward America. An anomalous circulation pattern mid‐latitudes, linked to a circumglobal wavetrain, resulted development subtropical high‐pressure system west Saharan heat low. created pressure dipole generated anomalously strong northeasterlies Sahara, caused continuous emissions...
ADM-Aeolus, the wind Lidar under development at ESA, is a High Spectral Resolution that additionally provides separated information on particles (Mie channel) and molecules (Rayleigh channel). signals will be accumulated in vertical range bins order to reach sufficient signal-to-noise ratio for reliable estimates. The bin integration may vary from 250mnear surface up 2 kmin upper troposphere lower stratosphere. Significant attenuation changes nature of retrieval problem. commonly used...
The dust activity over North Africa associated with the Saharan depression event in February 2007 is investigated by mean of spaceborne observations, ground‐based measurements, and mesoscale simulation Meso‐NH. main characteristics cyclone as well meteorological conditions during this are described using European Centre for Medium‐Range Weather Forecasts (ECMWF). storm cloud cover thoroughly combining first time Spinning Enhanced Visible Infra‐Red Imager (SEVIRI) images spatiotemporal...
Abstract In the afternoon of 15 July 2007, a thunderstorm was initiated within line cumulus clouds which formed parallel to crest Black Forest mountains during Intensive Observation Period (IOP) 8b Convective and Orographically‐induced Precipitation Study (COPS). This paper extends analysis processes that led convection initiation (CI), i.e. transition from shallow deep convection, on this day with data several COPS instruments have not been considered in previous studies. particular,...
Dynamical processes leading to dust emission over Syria and Iraq, in response a strong winter Shamal event as well the subsequent transport of Iraq northwest Iran, are analyzed on basis case study (22–23 February 2010) using suite ground‐based spaceborne remote sensing platforms together with modeling tools. Surface measurements 22 show sharp reduction horizontal visibility occurring shortly after passage cold front (behind which northwesterly winds were blowing) that visibilities could be...
Abstract. Experimental estimations of the infrared refractive index African mineral dust have been retrieved from laboratory measurements particle transmission spectra in wavelength range 2.5–25 μm. Five samples collected at Banizoumbou (Niger) and Tamanrasset (Algeria) during events originated different Western Saharan Sahelian areas investigated. The real (n) imaginary (k) parts obtained for vary 1.1–2.7 0.05–1.0, respectively, are strongly sensitive to mineralogical composition particles,...
Abstract. We characterise a transboundary ozone pollution outbreak transported across East Asia in early May 2009 using new multispectral satellite observations of lowermost tropospheric (located below 3 km altitude) synergy with other data and models. Our analysis is focused on the daily evolution plumes initially formed over North China Plain (NCP) their transport pathways northern China, Korea, Japan surrounding seas. A main aspect study an estimation contribution photochemical production...
Abstract This study examines the role of atmospheric forcings in occurrence open‐ocean polynyas by investigating case austral winter 2017's polynya located Lazarev Sea sector to east Weddell Sea, known as Maud Rise or Polynya. The ice‐free zone appeared mid‐September 2017 and grew large 80,000 km 2 end October before merging with open ocean after sea ice started retreat at beginning summer. Using a combination satellite observations reanalysis data high spatiotemporal resolution, we found...
Large amounts of dust in the air can disrupt daily activities and pose a threat to human health. In May 2022, consecutive major storms occurred over Middle East resulting severe environmental, social health impacts. this study, we investigate exceptional factors driving these effects clouds. Using combination satellite, in-situ reanalysis datasets, identify atmospheric triggers for occurrence storms, characterize their three-dimensional structure evaluate radiative impact. The emission was...
Study uses real-time monitors to analyze PM 2.5 in Abidjan & Accra, revealing diurnal seasonal patterns, highlighting city differences, showing Saharan dust impact. Emphasizes RAMPs' efficacy need for robust monitoring West African cities.
We document the seasonal evolution of Saharan atmospheric boundary layer (SABL), in terms vertical structure, diurnal cycle, aerosol content, and cloud cover as well surface radiative budget, during 2006, using a mobile multiplatform observatory implemented Tamanrasset (Algeria). Ground‐based remote sensing (both active passive) situ instruments were deployed framework African Monsoon Multidisciplinary Analysis field experiment used synergy with satellite observations. Observations showed...
Abstract This paper presents the results of co‐ordinated research flights over Saharan heat‐low, conducted during July 2006 as part African Monsoon Multidisciplinary Analysis (AMMA) Special Observing Periods. The consisted a morning transect on 14 with Falcon F20 aircraft Deutsches Zentrum für Luft‐ und Raumfahrt (DLR), using Doppler lidar WIND to observe tropospheric winds, followed by an afternoon flight 17 BAe146 Facility for Airborne Atmospheric Measurements (FAAM) releasing curtain 16...