LOA - Laboratoire d'Optique Atmosphèrique - UMR 8518

France Centre de recherche public
Accréditation CIR
Contact principal
Téléphone : 33(0)3 20 43 45 32
Mail : direction-loa@univ-lille1.fr
Adresse :
Bât. P5
59655 Villeneuve d'Ascq
France
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Description
(Extrait du site web)
Activité Générale :

L'optique atmosphérique cherche à modéliser la propagation à travers l'atmosphère de la lumière visible reçue du soleil et de la lumière infrarouge émise par l'ensemble des surfaces et de l'atmosphère terrestres. Les travaux menés au LOA dans ce domaine s'insèrent dans l'étude globale du climat.

Un premier objectif est de quantifier le rôle de ce rayonnement visible et infrarouge dans les échanges énergétiques de la planète, en particulier de préciser le rôle des nuages dans le bilan radiatif de la terre dont ils constituent un facteur essentiel.

Un second axe de recherche porte sur la caractérisation à l'échelle du globe de différents paramètres qui sont en relation directe avec l'évolution climatique (nuages, aérosols, surfaces), en utilisant principalement l'observation satellitaire.
Les travaux menés dans ce contexte mettent en oeuvre:

* La conception de logiciels permettant de simuler le transfert du rayonnement, à l'aide de modèles du système terre - atmosphère.
* L'analyse d'observations acquises par les capteurs satellitaires existants, le plus souvent sous forme d'images traitées sur ordinateur, et la conception d'expériences satellitaires nouvelles.
* La réalisation de campagnes d'observation de terrain, utilisant des appareillages développés par le laboratoire, mis en oeuvre au sol ou à partir d'avions ou de ballons stratosphériques, et destinés à valider les modèles ou à mettre en évidence les processus atmosphériques.

Le LOA est une unité Mixte de Recherches (UMR/CNRS 8518). Il fait partie de la Fédération de Recherches (FR1818) Milieux naturels et anthropisé Flux et dynamique.

Quelques documents de Laboratoire d'Optique Atmosphèrique
Correction of the stratospheric aerosol radiative influence in the POLDER measurements
1998
Auteurs : M. HERMAN, B. LAFRANCE et TAT SOON YEO
Masquer le résumé
This paper presents the principles and performances of the stratospheric aerosol correction schemes for the Polarization and Directionality of the Earth's Reflectances (POLDER) spatial polarimeter measurements and the method used to derive, from the Stratospheric Aerosol and Gas Experiment II (SAGE II) data, the information about the aerosols that is needed for the correction. On the Advanced Earth Observing Satellite (ADEOS) platform since August 1996, POLDER performs multidirectional measurements, both of reflectance and of polarization in visible and near-infrared spectral bands. These new observational capabilities are used to observe clouds, lands, ocean surfaces, and tropospheric aerosols. These observations are weakly perturbed by the stratospheric aerosols, whose amount is currently low, but in the case of a major volcanic eruption, would increase strongly for few years. The possibility of such a situation has to be considered. Moreover, even near background conditions, the stratospheric aerosols perturb accurate retrieval of the ocean color and products deduced from the polarized light. That is why a systematic correction of their influence on the measured signal has been developed.
Keywords :
Stratosphere ; Stratospheric aerosol ; Atmospheric correction ; Radiative properties ; Polarimetry ; Satellite observation ; Performance ;
Source : Pascal - INIST  

Comparison of POLDER cloud phase retrievals to active remote sensors measurements at the ARL SGP site
2001
Auteurs : R. T. MARCHAND, Goloub PHILLIPPE et Jérome RIEDI
Masquer le résumé
In our present study, cloud boundaries derived from a combination of active remote sensors at the ARM SGP site are compared to POLDER cloud top phase index which is derived from polarimetric measurements using an innovative method. This approach shows the viability of the POLDER phase retrieval algorithm, and also leads to interesting results. In particular, the analysis demonstrates the sensitivity of polarization measurements to ice crystal shape and indicates that occurrence of polycrystalline ice clouds has to be taken into account in order to improve the POLDER phase retrieval algorithm accuracy. Secondly, the results show that a temperature threshold of 240 K could serve for cloud top particle phase classification. Considering the limitations of the analysis, the temperature threshold could be biased high, but not by more than about 5 degrees.
Keywords :
Ice cloud ; Measurement method ; Algorithm ; Sensitivity analysis ; Polarization ; Ice crystals ; Crystal form ; Polycrystalline ice ; Classification ; Data analysis ; Great Plains of America ; Temperature dependence ; North America ; America ;
Source : Pascal - INIST  

Global and regional Earth-system monitoring using satellite and in-situ data
GEMS
2005 - 2009

Sujets :
Earth Sciences, Environmental Protection, Meteorology, Aerospace Technology
Participants :
Laboratoire d'Optique Atmosphèrique
Laboratoire d'Optique Atmosphèrique


European Centre for Medium-Range Weather Forecasts
European Centre for Medium-Range Weather Forecasts


Danish Meteorological Institute
Danish Meteorological Institute


National Technical University of Athens
National Technical University of Athens


Arpa Emilia Romagna
Arpa Emilia Romagna


Deutscher Wetterdienst
Deutscher Wetterdienst


COMMISSARIAT À L'ENERGIE ATOMIQUE FRANCE
COMMISSARIAT À L'ENERGIE ATOMIQUE
Research

LABORATOIRE DES SCIENCES DU CLIMAT ET DE L'ENVIRONMENT JOINT RESEARCH UNIT CEA-CNRS 1572' 31/33 rue de la Federation
FRANCE
IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY AND MEDICINE UNITED KINGDOM
IMPERIAL COLLEGE OF SCIENCE, TECHNOLOGY AND MEDICINE
Education

EPIDEMIOLOGY & PUBLIC HEALTH, DIVISION OF PRIMARY CARE & POPULATION HEALTH SCIENCES Exhibition Road
UNITED KINGDOM
MAX PLANCK GESELLSCHAFT ZUR FÖRDERUNG DER WISSENSCHAFTEN E.V. DEUTSCHLAND
MAX PLANCK GESELLSCHAFT ZUR FÖRDERUNG DER WISSENSCHAFTEN E.V.
Other,Research

MAX-PLANCK-INSTITUT FÜR METEOROLOGIE Postfach 101062 Hofgartenstrasse 8
DEUTSCHLAND
ROYAL NETHERLANDS METEOROLOGICAL INSTITUTE NEDERLAND
ROYAL NETHERLANDS METEOROLOGICAL INSTITUTE
Other

DEPARTMENT OF CLIMATE RESEARCH AND SEISMOLOGY PO Box 201 Wilhlminalaan 10
NEDERLAND
INSTITUT D'AERONOMIE SPATIALE DE BELGIQUE BELGIQUE-BELGIË
INSTITUT D'AERONOMIE SPATIALE DE BELGIQUE
Research

IASB/BIRA 3 Avenue Circulaire
BELGIQUE-BELGIË
FINNISH METEOROLOGICAL INSTITUTE SUOMI/FINLAND
FINNISH METEOROLOGICAL INSTITUTE
Research

RESEARCH DEPARTMENT PO Box 503 Vuorikatu 24
SUOMI/FINLAND
UNIVERSITY OF BREMEN DEUTSCHLAND
UNIVERSITY OF BREMEN
Education

UNIVERSITY OF BREMEN, DEP. OF PHYSICS (FBI), INST. OF ENVIRON. PHYSICS AND REMOTE SENSING (IUP/IFE) Postfach 330440 Bibliotheksstrasse
DEUTSCHLAND
UNIVERSITE PIERRE ET MARIE CURIE FRANCE
UNIVERSITE PIERRE ET MARIE CURIE
Education

SERVICE D'AÉRONOMIE - UPMC - TOUR 45-46 (BOITE 102) 4, Place Jussieu
FRANCE
METEO-FRANCE, CENTRE NATIONAL DE RECHERCHES METEOROLOGIQUES FRANCE
METEO-FRANCE, CENTRE NATIONAL DE RECHERCHES METEOROLOGIQUES
Research

CENTRE NATIONAL DE RECHERCHES METEOROLOGIQUES Avenue Gaspard Coriolis, 42
FRANCE
NATIONAL UNIVERSITY OF IRELAND, GALWAY ÉIRE/IRELAND
NATIONAL UNIVERSITY OF IRELAND, GALWAY
Education

ENVIRONMENTAL CHANGE INSTITUTE University Road
ÉIRE/IRELAND
KONINKLIJK METEOROLOGISCH INSTITUUT - INSTITUT ROYAL METEOROLOGIQUE BELGIQUE-BELGIË
KONINKLIJK METEOROLOGISCH INSTITUUT - INSTITUT ROYAL METEOROLOGIQUE
Research

DEPARTMENT OF OBSERVATIONS Ringlaan 3
BELGIQUE-BELGIË
CONSIGLIO NAZIONALE DELLE RICERCHE ITALIA
CONSIGLIO NAZIONALE DELLE RICERCHE
Research

INSTITUTO DI SCIENZE DELL'ATMOSFERA E DEL CLIMA, ISAC-CNR' Piazzale Aldo Moro 7
ITALIA
METEOROLOGISK INSTITUTT NORGE
METEOROLOGISK INSTITUTT
Research

RESEARCH AND DEVELOPMENT DEPARTMENT, AIR POLLUTION SECTION Niels Henrik Abels vei 40
NORGE
RHENISH INSTITUTE FOR ENVIRONMENTAL RESEARCH AT THE UNIVERSITY OF COLOGNE DEUTSCHLAND
RHENISH INSTITUTE FOR ENVIRONMENTAL RESEARCH AT THE UNIVERSITY OF COLOGNE
Research

DATA ASSIMILATION RESEARCH GROUP Aachener Strasse 201 -209
DEUTSCHLAND
EUROPEAN COMMISSION, GENERAL DIRECTORATE JOINT RESEARCH CENTRE ITALIA
EUROPEAN COMMISSION, GENERAL DIRECTORATE JOINT RESEARCH CENTRE
Research

CLIMATE CHANGE UNIT OF THE INSTITUE FOR ENVIRONMENT AND SUSTAINABILITY Via E. Fermi, 1
ITALIA
INSTITUT NATIONAL DE L'ENVIRONNEMENT INDUSTRIEL ET RISQUES FRANCE
INSTITUT NATIONAL DE L'ENVIRONNEMENT INDUSTRIEL ET RISQUES
Research

CHRONIC RISKS DIVISION Parc Technologique Alata
FRANCE
CZECH HYDROMETEOROLOGICAL INSTITUTE CESKA REPUBLIKA
CZECH HYDROMETEOROLOGICAL INSTITUTE
Other

CZECH HYDROMETEOROLOGICAL INSTITUTE Na Sabatce 17
CESKA REPUBLIKA
ENVIRONMENTAL PROTECTION AGENCY IRELAND ÉIRE/IRELAND
ENVIRONMENTAL PROTECTION AGENCY IRELAND
Other

ERTDI PROGRAMME, ENVIRONMENTAL PROTECTION AGENCY IRELAND PO Box 3000 Johnstown Castle Estate
ÉIRE/IRELAND
MET OFFICE UNITED KINGDOM
MET OFFICE
Other

MET OFFICE HADLEY CENTRE FOR CLIMATE PREDICTION AND RESEARCH Fitzroy road
UNITED KINGDOM
POLISH INSTITUTE OF ENVIRONMENTAL PROTECTION POLSKA
POLISH INSTITUTE OF ENVIRONMENTAL PROTECTION

DEPARTMENT OF ENVIRONMENTAL POLICY - SECTION OF INTEGRATED MODELLING AIR POLLUTION MONITORING DIVISION Krucza 5/11
POLSKA
FORSCHUNGSZENTRUM JUELICH GMBH DEUTSCHLAND
FORSCHUNGSZENTRUM JUELICH GMBH

INSTITUTE OF CHEMISTRY AND DYNAMICS OF THE GEOSPHERE, TROPOSPHERE (ICG II)
DEUTSCHLAND
THE PROVOST, FELLOWS AND SCHOLARS OF THE COLLEGE OF THE HOLY AND UNDIVIDED TRINITY OF QUEEN ELIZABETH, NEAR DUBLIN (HEREINAFTER CALLED TCD) ÉIRE/IRELAND
THE PROVOST, FELLOWS AND SCHOLARS OF THE COLLEGE OF THE HOLY AND UNDIVIDED TRINITY OF QUEEN ELIZABETH, NEAR DUBLIN (HEREINAFTER CALLED TCD)

DEPARTMENT OF CIVIL STRUCTURAL & ENVIRONMENT ENGINEERING 2 College Green
ÉIRE/IRELAND
Hide objectives
Fifteen thousand excess deaths in the heat wave of summer 2003 showed that Europe lacks operational capabilities to provide adequate medium-range (3-7 day) & short-range (1-3 day) forecasts for natural disasters involving atmospheric chemistry & dy namics. This proposal, GEMS, will create new European operational capabilities for medium-range & short-range air-chemistry forecasts, through much improved exploitation of satellite data. The GEMS consortium comprises ten regional centres, most with o perational responsibilities for regional air-quality forecasting, ten leading research labs with capabilities & models on all aspects of atmospheric chemistry, two leading European labs, ECMWF with global operational weather capabilities, & the E U's JRC with global diagnostic capabilities. The research teams & ECMWF will develop a global operational medium-range forecast / assimilation capability for dynamics & composition, exploiting all available satellite data. The global forecasts wil l provide key information on long-range transport of air pollutants to the regional forecast models, through the forecast boundary conditions used by the regional systems. The improved regional forecasts will be used by air-quality authorities at city leve l, in dozens of cities across Europe. Based on the best science, the integrated forecast / assimilation capability will provide a powerful monitoring capability for greenhouse gases, reactive gases and aerosols. Sophisticated new inversion methods will be developed to infer surface fluxes of CO2 and other species through use of the surface flask data with the gridded atmospheric fields on transport & composition. The GEMS project will produce global retrospective analyses of the atmospheric dynamics and composition for the troposphere & stratosphere, and will be able to assess the impact of changes both on global & regional scale, examining extremes as well as means. The real-time & retros

Source : Cordis  

Global distribution of cloud top phase from POLDER/ADEOS I.
2000
Auteurs : P. Couvert, Marie DOUTRIAUX-BOUCHER, Goloub PHILLIPPE et Jérome RIEDI
Masquer le résumé
The eight months of data acquired by the POLDER instrument have now been processed. This dataset provides daily information on the global distribution of cloud top phase. We present here the results of a statistical analysis of ice and liquid phase occurrence frequencies at the global scale. Temporal variation of these frequencies above land and ocean are analyzed. These results are compared with ISCCP data and the consistency of the POLDER phase product is demonstrated.
Keywords :
Space remote sensing ; Satellite observation ; Clouds ; Data analysis ; Planetary scale ; Statistical analysis ; Liquid phase ; Solid phase ; Ice ; Occurrence frequency ; Time variation ;
Source : Pascal - INIST  

Mineralogy of Saharan dust transported over northwestern tropical Atlantic Ocean in relation to source regions
2002
Auteurs : Sandrine Caquineau, Annie Gaudichet, Annie Gaudichet, Laurent Gomes, Gilet L., Michel LEGRAND et M. Legrand
Masquer le résumé
[1] On the basis of daily Saharan dust samples collected at Sal Island (Cape Verde Archipelagos) and Barbados (Caribbean Sea) over 3 years, this study focuses on the mineralogical signature of the African sources providing dust over the tropical North Atlantic Ocean. First, the sources of the collected dust were localized by using relative clays abundance (illite-to-kaolinite ratio) combined with Meteosat infrared imagery, horizontal visibility, and backward trajectories of dusty air masses. Then, each identified source was linked to a single value of the illite-to-kaolinite ratio. Those results highlight that the clay content of the emitted dust depends directly on both the latitude and the longitude of the source. Dust originating from northwestern sources exhibits illite-to-kaolinite ratios higher than those from Sahelian regions. Likewise, illite-to-kolinite ratio decreases from west to east.
Keywords :
America ; Central America ; West Indies ; Atlantic Ocean Islands ; Atlantic Ocean ; Meteosat satellites ; Caribbean Sea ; Barbados ; Cape Verde Islands ; Tropical Atlantic Ocean ; Inorganic compound ; Image analysis ; Satellite observation ; Atmospheric dust ; Air mass ; Trajectory ; Infrared imaging ; Mineralogy ;
Source : Pascal - INIST  

Characteristics of the UV radiation field in the Alps
1998 - 2000

Sujets :
Meteorology, Forecasting, Measurement Methods, Environmental Protection
Participants :
Laboratoire d'Optique Atmosphèrique
Laboratoire d'Optique Atmosphèrique


LEOPOLD-FRANZENS-UNIVERSITAET INNSBRUCK ÖSTERREICH
LEOPOLD-FRANZENS-UNIVERSITAET INNSBRUCK
Education

INSTITUTE OF MEDICAL PHYSICS 44,Müllerstrasse 44 6020
ÖSTERREICH
FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V. DEUTSCHLAND
FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Research

INSTITUT FUER ATMOSPHAERISCHE UMWELTFORSCHUNG EV Kreuzeckbahnstrasse 19 82467
DEUTSCHLAND
UNIVERSITAET FUER BODENKULTUR WIEN ÖSTERREICH
UNIVERSITAET FUER BODENKULTUR WIEN
Education,Other

INSTITUT FÜR METEOROLOGIE UND PHYSIK 18,Turkenschanzstrasse 18 1180
ÖSTERREICH
UNIVERSITE JOSEPH FOURIER - GRENOBLE 1 FRANCE
UNIVERSITE JOSEPH FOURIER - GRENOBLE 1
Education

EQUIPE INETERACTIONS RAYONNEMENT SOLAI RE ATMOSPHÈRE Quai Claude Bernard 17 38000
FRANCE
Physikalisch-Meteorologisches Observatorium Davos SCHWEIZ/SUISSE/SVIZZERA
Physikalisch-Meteorologisches Observatorium Davos
Research

Weltstrahlungszentrum 33,Dorfstraße 7260
SCHWEIZ/SUISSE/SVIZZERA

Source : Cordis  

Ultraviolet spectral irradiance in the French Alps : Results of two campaigns
1999
Auteurs : J. L. BOCQUET, Colette Brogniez, Jacqueline LENOBLE, D. MASSEROT et E. PACHART
Masquer le résumé
The ultraviolet spectral irradiance has been measured in the Alps in Briançon (altitude 1300 m asl) in July 1996 and March 1997, with the spectroradiometer of the University of Lille. The erythemal dose rate has been measured simultaneously with a broadband instrument. The aerosol optical depth, necessary as input for modeling, was measured with a Sun photometer. On cloudy days, irradiance is highly variable, with values exceeding those of clear days when the direct solar beam is not obstructed by clouds. For clear days, measured values are compared with the results of a radiative transfer model, and the influence of altitude and ground surface reflectance is analyzed. For the same solar zenith angle, irradiance in UVA is 8-10% higher in Briançon than in Brussels, half of the difference being due to the higher altitude of Briançon. Comparison of winter and summer values shows an amplification of ∼10-15% in winter owing to the snow reflectance; it can be explained by an effective reflectance of 0.3-0.4.
Keywords :
Solar radiation ; Ultraviolet radiation ; Irradiance ; Spectroradiometry ; Dose rate ; Clear sky ; Radiative transfer ; Observation data ; Comparative study ; Altitudinal distribution ; Ground surface ; Reflectance ; Alps ; France ; Europe ;
Source : Pascal - INIST  





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