A5082576607- Atmospheric aerosols and clouds
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Calibration and Measurement Techniques
- Meteorological Phenomena and Simulations
- Aeolian processes and effects
- Solar Radiation and Photovoltaics
- Remote Sensing in Agriculture
- Planetary Science and Exploration
- Satellite Image Processing and Photogrammetry
- Air Quality Monitoring and Forecasting
- Remote Sensing and LiDAR Applications
- Remote Sensing and Land Use
- Infrared Target Detection Methodologies
- Geochemistry and Geologic Mapping
- Optical Polarization and Ellipsometry
- Air Quality and Health Impacts
- Geophysics and Gravity Measurements
- Icing and De-icing Technologies
- Environmental Sustainability and Technology
- Precipitation Measurement and Analysis
- Oceanographic and Atmospheric Processes
- Urban Heat Island Mitigation
- Advanced Optical Network Technologies
Laboratoire d'Optique Atmosphérique
2015-2024
Centre National de la Recherche Scientifique
2013-2024
Université de Lille
2013-2023
University of Reading
2017
Polarimetry is one of the most promising types remote sensing for improved characterization atmospheric aerosol. Indeed, aerosol particles constitute a highly variable component characterized by large number parameters describing particle sizes, morphologies (including shape and internal structure), absorption scattering properties, amounts, horizontal vertical distribution, etc. Reliable monitoring all these very challenging, therefore effects on climate environment are considered to be...
Abstract This paper investigates the important difference in relationship between brightness temperatures 11-μm and 12-μn AVHRR data microphysical properties of semitransparent cirrus clouds. In nonscattering approximation, emittance for channels 4 5 are related through absorption coefficient ratio that is key parameter giving access to size cloud particles. The observed mean value this corresponds effective radius 18 μm polydisperse spheres 12 infinitely long ice cylinders. Taking multiple...
Abstract. The Chemistry-Aerosol Mediterranean Experiment (ChArMEx; http://charmex.lsce.ipsl.fr) is a collaborative research program federating international activities to investigate regional chemistry-climate interactions. A special observing period (SOP-1a) including intensive airborne measurements was performed in the framework of Aerosol Direct Radiative Impact on climate MEDiterranean region (ADRIMED) project during dry season over western and central basins, with focus...
Abstract POLDER (POLarization and Directionality of the Earth's Reflectances) is a new instrument devoted to globalobservation polarization directionality solar radiation reflected by Earth surface-atmosphere system. This radiometer has been on board Japanese ADEOS platform since August 1996. paper describes main algorithms 'Earth budget (ERB) & clouds' processing line used derive products routine basis in early phase mission. In addition bidirectional reflectance distribution functions,...
POLDER is a CNES instrument on board NASDA's ADEOS polar orbiting satellite, which was successfully launched in August 1996. On October 30, 1996, entered its nominal acquisition phase and worked perfectly until ADEOS's early end of service June 1997. multispectral imaging radiometer/polarimeter designed to collect global repetitive observations the solar radiation reflected by Earth/atmosphere system, with wide field view (2400 km) moderate geometric resolution (6 km). The concept based...
Abstract New evidence from collocated measurements, with support theory and numerical simulations, that multidirectional measurements in the oxygen A band third Polarization Directionality of Earth’s Reflectances (POLDER-3) instrument on Anisotropy for Atmospheric Sciences coupled Observations a Lidar (PARASOL) satellite platform within “A-Train” can help to characterize vertical structure clouds is presented. In case monolayered clouds, standard POLDER cloud pressure product PO2 shown be...
Abstract. The global spatial and diurnal distribution of cloud properties is a key issue for understanding the hydrological cycle, critical advancing efforts to improve numerical weather models general circulation models. Satellite data provides best way gaining insight into properties. In particular, determination thermodynamic phase first step in process inferring optical microphysical from satellite measurements. It important that be derived together with an estimate confidence this...
CLOUDYCOLUMN is one of the 6 ACE-2 projects which took place in June-July 1997, between Portugal and Canary Islands.It was specifically dedicated to study changes cloud radiative properties resulting from those aerosols act as condensation nuclei.This process also refered aerosol indirect effect on climate.CLOUDYCOLUMN focused contribution stratocumulus clouds that process.In addition basic measurements performed at ground stations project, 5 instrumented aircraft carried out situ...
Over 150 jet engine power-loss and damage events have been attributed to a phenomenon known as Ice Crystal Icing (ICI) during the past two decades. Attributed ingestion of large numbers small ice particles into core, typically these occurred at high altitudes near convective systems in tropical air masses. In recent years there substantial international efforts by scientists, engineers, aviation regulators airlines better understand relevant meteorological processes, solve critical...
The POLDER radiometer was on board the ADEOS satellite from August 1996 to June 1997. This instrument measures radiances in eight narrow spectral bands of visible and near infrared spectrum. Two them are centered O 2 A‐band order infer cloud pressure. By assuming atmosphere behaves as a pure absorbing medium overlying perfect reflector, an ”apparent” pressure P app is derived data. For validation purposes, first compared sea‐surface s for clear‐sky conditions; found be close (within ∼30 hPa)...
Abstract An algorithm that allows an automatic analysis of cirrus properties from Advanced Very High Resolution Radiometer (AVHRR) observations is presented. Further investigations the information content and physical meaning brightness temperature differences (BTD) between channels 4 (11 μm) 5 (12 radiometer have led to development procedure provide global estimates both cloud ratio equivalent absorption coefficients in two channels, accounting for scattering effects. The useful since its...
Abstract. Cloud optical thickness (COT) is one of the most important parameter for characterization cloud in Earth radiative budget. Its retrieval strongly depends on instrument characteristics and many environment factors. Using coincident observations from POLDER/PARASOL MODIS/AQUA A-Train constellation, geographical distributions seasonal changes COT are presented, good agreement with general climatology characteristics. Retrieval uncertainties mainly associated to sensor spatial...
Abstract The Polarization and Anisotropy of Reflectances for Atmospheric Sciences Coupled with Observations from a Lidar (PARASOL) Aqua are two satellites on sun-synchronous orbits in the A-Train constellation. Aboard these platforms, Directionality Earth (POLDER) Moderate Resolution Imaging Spectroradiometer (MODIS) provide quasi simultaneous coincident observations cloud properties. similar but different detecting characteristics sensors call comparison between derived datasets to identify...
The POLDER instrument is devoted to global observations of the solar radiation reflected by Earth-atmosphere system. Algorithms "Earth Radiation Budget and Clouds" processing line implemented at French Space Center are applied ADEOS-POLDER data. First results on derived cloud properties presented from level 2 data 10 November 1996 3 products June 1997. A good correlation observed between detection algorithm Dynamical Clustering Method METEOSAT multidirectional capability appears useful check...
Abstract. The Eyjafjallajökull eruption, which occurred during May 2010, is used as a case study to evaluate the consistency of detection and characterization volcanic ash plumes from different thermal infrared instruments. In this study, well-known split window technique retrieve optical thickness effective particle size, estimate mass concentration particles brightness temperatures measured in atmospheric (8–12 μm). Retrievals are obtained for several mineral compositions whose properties...
Abstract The detection of multilayer cloud situations is important for satellite retrieval algorithms and many climate-related applications. In this paper, the authors describe an algorithm based on exploitation Polarization Directionality Earth’s Reflectance (POLDER) observations to identify monolayered multilayered cloudy along with a confidence index. authors’ reference comes from synergy active instruments A-Train constellation. upon decision tree that uses metric information theory...
Abstract. Simulations of total and polarized cloud reflectance angular signatures such as the ones measured by multi-angular radiometer POLDER3/PARASOL are used to evaluate heterogeneity effects on parameter retrievals. Effects optical thickness, albedo, effective radius variance droplet size distribution aerosol parameters above analyzed. Three different clouds that have same mean thicknesses were generated: first with a flat top, second bumpy top last fractional cover. At small scale (50...
Abstract In the frame of validation spatial observations from radiometer IIR on board CALIPSO, two airborne campaigns Cirrus Cloud Experiment (CIRCLE)-2 and Biscay ‘08 took place in 2007 2008 western part France, over Atlantic Ocean. During these experiments, remote sensing measurements were made cirrus clouds, right under track Cloud–Aerosol Lidar Infrared Pathfinder Satellite Observations (CALIPSO) space time collocation. For this purpose, a Falcon-20 aircraft was equipped with pour...
Abstract. We present an evaluation of the ability passive broadband geostationary satellite measurements to detect high ice water content (IWC > 1 g m−3) as part European High Altitude Ice Crystals (HAIC) project for detection upper-atmospheric IWC, which can be a hazard aviation. developed IWC mask based on cloud properties using Cloud Physical Properties (CPP) algorithm applied Meteosat Second Generation (MSG) Spinning Enhanced Visible and Infrared Imager (SEVIRI). Evaluation with...
Abstract. This paper describes new advances in the exploitation of oxygen A-band measurements from POLDER3 sensor onboard PARASOL, satellite platform within A-Train. These developments result not only an account dependence POLDER parameters to cloud optical thickness τ and scene's geometrical conditions but also, more importantly, finer understanding sensitivity these vertical extent. is made possible thanks multidirectional character measurements. In case monolayer clouds that represent...
Abstract. Information content analyses on cloud top altitude (CTOP) and geometrical thickness (CGT) from multi-angular A-band measurements in the case of monolayer homogeneous clouds are conducted. In framework future radiometer development, we compared potential performances 3MI (Multi-viewing, Multi-channel Multi-polarization Imaging) instrument developed by EUMETSAT, which is an extension POLDER/PARASOL MSPI (Multiangle SpectroPolarimetric Imager) NASA's Jet Propulsion Laboratory....
The next generation of earth radiation budget satellite instruments will routinely merge estimates global top-of-atmosphere radiative fluxes with cloud properties.This information offer many new opportunities for validating transfer models and parameterizations in climate models.In this study, five months Polarization Directionality the Earth's Reflectances 670-nm radiance measurements are considered order to examine how property retrievals can be used define empirical angular distribution...
The usual procedure for retrieving the optical thickness of liquid water clouds from satellite-measured radiances is based on assumption plane-parallel layers composed droplets. This study investigates validity this Advanced Earth Orbiting Satellite–Polarization and Directionality Earth's Reflectances (ADEOS–POLDER) observations. To do that, authors take advantage multidirectional viewing capability POLDER instrument, which functioned nominally aboard ADEOS November 1996 to June 1997. cloud...
The narrowband albedos derived from Polarization and Directionality of Earth Reflectances (POLDER) measurements have been described in a companion paper (Buriez et al., 2005). Here, they are used to estimate the broadband shortwave albedo. Except for gaseous absorption, at 443 670 nm considered as representative UV‐visible range, albedo 865 is near infrared. absorption estimated TOMS data POLDER 910‐ 865‐nm reflectance ratio. In previous approach, respective weights three were based on...