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
Climatological aspects of the optical properties of fine/coarse mode aerosol mixtures
2010
Auteurs : B. CHATENET, H Chen, Oleg DUBOVIK, T. F. Eck, D. M. GILES, Brent N. HOLBEN, Z. LI, N. T. O'NEILL, Goloub PHILLIPPE, Rachel T. PINKER, J S Reid, R P SINGH, Alexander SINYUK, A. SMIRNOV, S. N. Tripathi, P. Wang et X Xia
Masquer le résumé
[1] Aerosol mixtures composed of coarse mode desert dust combined with fine mode combustion generated aerosols (from fossil fuel and biomass burning sources) were investigated at three locations that are in and/or downwind of major global aerosol emission source regions. Multiyear monitoring data at Aerosol Robotic Network sites in Beijing (central eastern China), Kanpur (Indo-Gangetic Plain, northern India), and Ilorin (Nigeria, Sudanian zone of West Africa) were utilized to study the climatological characteristics of aerosol optical properties. Multiyear climatological averages of spectral single scattering albedo (SSA) versus fine mode fraction (FMF) of aerosol optical depth at 675 nm at all three sites exhibited relatively linear trends up to ~50% FMF. This suggests the possibility that external linear mixing of both fine and coarse mode components (weighted by FMF) dominates the SSA variation, where the SSA of each component remains relatively constant for this range of FMF only. However, it is likely that a combination of other factors is also involved in determining the dynamics of SSA as a function of FMF, such as fine mode particles adhering to coarse mode dust. The spectral variation of the climatological averaged aerosol absorption optical depth (AAOD) was nearly linear in logarithmic coordinates over the wavelength range of 440-870 nm for both the Kanpur and Ilorin sites. However, at two sites in China (Beijing and Xianghe), a distinct nonlinearity in spectral AAOD in logarithmic space was observed, suggesting the possibility of anomalously strong absorption in coarse mode aerosols increasing the 870 nm AAOD.
Keywords :
Africa ; West Africa ; Asia ; Far East ; China ; Nigeria ; India ; Eastern China ; Beijing China ; Nonlinearity ; wavelength ; coordinates ; absorption ; particles ; dynamics ; Mixing ; mixing ; trend-surface analysis ; exhibits ; Optical thickness ; albedo ; plains ; networks ; monitoring ; global ; Vegetation fire ; Fossil fuel ; combustion ; dust ; deserts ; aerosols ; fine-grained materials ; optical properties ;
Source : Pascal - INIST  

Sensitivity of multiangle, multispectral polarimetric remote sensing over open oceans to water-leaving radiance: Analyses of RSP data acquired during the MILAGRO campaign
2012
Auteurs : Brian CAIRNS, Jacek CHOWDHARY, Brian Cairns, Jacek Chowdhary, Kirk KNOBELSPIESSE, Kirk Knobelspiesse, Michael I. MISHCHENKO, Michael I. MISHCHENKOL, Matteo OTTAVIANI, Matteo Ottaviani, Jens REDEMANN, Larry TRAVIS, L. Travis, Fabien WAQUET et Fabien Waquet
Masquer le résumé
For remote sensing of aerosol over the ocean, there is a contribution from light scattered under water. The brightness and spectrum of this light depends on the biomass content of the ocean, such that variations in the color of the ocean can be observed even from space. Rayleigh scattering by pure sea water, and Rayleigh-Gans type scattering by plankton, causes this light to be polarized with a distinctive angular distribution. To study the contribution of this underwater light polarization to multiangle, multispectral observations of polarized reflectance over ocean, we previously developed a hydrosol model for use in underwater light scattering computations that produces realistic variations of the ocean color and the underwater light polarization signature of pure sea water. In this work we review this hydrosol model, include a correction for the spectrum of the particulate scattering coefficient and backscattering efficiency, and discuss its sensitivity to variations in colored dissolved organic matter (CDOM) and in the scattering function of marine particulates. We then apply this model to measurements of total and polarized reflectance that were acquired over open ocean during the MILAGRO field campaign by the airborne Research Scanning Polarimeter (RSP). Analyses show that our hydrosol model faithfully reproduces the water-leaving contributions to RSP reflectance, and that the sensitivity of these contributions to Chlorophyll a concentration [Chl] in the ocean varies with the azimuth, height, and wavelength of observations. We also show that the impact of variations in CDOM on the polarized reflectance observed by the RSP at low altitude is comparable to or much less than the standard error of this reflectance whereas their effects in total reflectance may be substantial (i.e. up to >30%). Finally, we extend our study of polarized reflectance variations with [Chl] and CDOM to include results for simulated spaceborne observations.
Keywords :
Modeling ; models ; Polarized radiation ; polarization ; Underwater ; distribution ; plankton ; Type ; color ; variations ; Content ; biomass ; brightness ; Light ; marine environment ; aerosols ; data ; analysis ; radiance ; sea water ; ocean ; Pelagic zone ; remote sensing ; Multispectral detection ; Sensitivity ; Remote sensing ; Polarization ; RSP ; MILAGRO ; Aerosol ; Hydrosol ; Ocean color ; Case-1 waters ; Bio-optics ; Chlorophyll a ; CDOM ; Plankton ; Scattering ; Radiative transfer ;
Source : Pascal - INIST  

Impact of sea-surface dust radiative forcing on the oceanic primary production : A 1D modeling approach applied to the West African coastal waters
2009
Auteurs : Malik Chami, Philippe DUBUISSON, Bernard Gentili, Marc Mallet et Richard Sempere
Pas de résumé disponible
Keywords :
Source : HAL  

Investigation of the variations in the water leaving polarized reflectance from the POLDER satellite data over two biogeochemical contrasted oceanic areas. 2009.
2008
Auteurs : M. Chami, Philippe DUBUISSON, D. Dessailly, L. Duforet et H. Loisel
Pas de résumé disponible
Keywords :
Source : HAL  

Delivery of aerosol products for assimilation and environmental use
DAEDALUS
2003 - 2005

Sujets :
Resources of the Sea, Fisheries, Forecasting, Meteorology, Environmental Protection
Participants :
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE FRANCE
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
Research

URA 0713 - LABORATOIRE D'OPTIQUE ATMOSPHÉRIQUE Laboratoire d'Optique Atmosphérique (URA 713) UER de Physique Fondamentale Université de Lille 59655
FRANCE
ROYAL NETHERLANDS METEOROLOGICAL INSTITUTE NEDERLAND
ROYAL NETHERLANDS METEOROLOGICAL INSTITUTE
Other

P.O. Box 201 10,Wilhelminalaan 10 3730 AE
NEDERLAND
BELGIAN INSTITUTE FOR SPACE AERONOMY BELGIQUE-BELGIË
BELGIAN INSTITUTE FOR SPACE AERONOMY
Research,Other

3,Ringlaan 3 1180
BELGIQUE-BELGIË
NORWEGIAN INSTITUTE FOR AIR RESEARCH NORGE
NORWEGIAN INSTITUTE FOR AIR RESEARCH
Research,Other

P.O. Box 100 Instituttveien 18 2027
NORGE
NETHERLANDS ORGANISATION FOR APPLIED SCIENTIFIC RESEARCH - TNO NEDERLAND
NETHERLANDS ORGANISATION FOR APPLIED SCIENTIFIC RESEARCH - TNO
Research,Other

TNO PHYSICS AND ELECTRONICS LABORATORY P.B. 6031 63,Oude Waalsdorperweg 63 2509 JG
NEDERLAND
UNIVERSITY OF SCIENCE AND TECHNOLOGY OF LILLE FRANCE
UNIVERSITY OF SCIENCE AND TECHNOLOGY OF LILLE
Education

UMR 8518 - LABORATOIRE D'OPTIQUE ATMOSPHÉRIQUE Bètiment P5 59655
FRANCE
UNIVERSIDADE DE EVORA PORTUGAL
UNIVERSIDADE DE EVORA
Education

CENTRO DE GEOFISICA DE EVORA PO Box 94 Rua Romao Ramalho 59 7000-671
PORTUGAL
COMMISSION OF THE EUROPEAN COMMUNITIES ITALIA
COMMISSION OF THE EUROPEAN COMMUNITIES
Research

INSTITUTE FOR ENVIRONMENT AND SUSTAINABILITY CLIMATE CHANGE UNIT Via Enrico Fermi 1 21020
ITALIA
Laboratoire d'Optique Atmosphèrique
Laboratoire d'Optique Atmosphèrique


Royal Netherlands Meteorological Institute
Royal Netherlands Meteorological Institute


Belgian Institute for Space Aeronomy
Belgian Institute for Space Aeronomy


Norwegian Institute for Air Research
Norwegian Institute for Air Research


NETHERLANDS ORGANISATION FOR APPLIED SCIENTIFIC RESEARCH
NETHERLANDS ORGANISATION FOR APPLIED SCIENTIFIC RESEARCH


Hide objectives
Atmospheric aerosols affect human health, continental and marine ecosystems, visibility, and the Earth's climate, requiring dedicated monitoring of their properties. DAEDALUS is a focused project to make an inventory of existing data relevant to aerosol monitoring, assess the users' needs at the European level interims of troposphere and stratospheric aerosol properties, evaluate the scientific, technical, and institutional efforts needed to meet the users' needs, match the available aerosol data products with the information needed by the group of users, and improve methodologies for making optimal use of satellite data and for assimilating aerosol data in transport models. DAEDALUS will provide the necessary impetus for designing long-term sustainable and fully operational European monitoring of aerosol properties at regional and global scales over sea and over land, as foreseen in GMES.

Source : Cordis  

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

Sujets :
Earth Sciences, Environmental Protection, Meteorology, Aerospace Technology
Participants :
EUROPEAN CENTRE FOR MEDIUM-RANGE WEATHER FORECASTS UNITED KINGDOM
EUROPEAN CENTRE FOR MEDIUM-RANGE WEATHER FORECASTS
Other

ECMWF Shinfield Park
UNITED KINGDOM
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
DANISH METEOROLOGICAL INSTITUTE DANMARK
DANISH METEOROLOGICAL INSTITUTE
Other

METEOROLOGICAL RESEARCH DIVISION / DANISH METEOROLOGICAL INSTITUTE Lyngbyvej 100
DANMARK
DEUTSCHER WETTERDIENST DEUTSCHLAND
DEUTSCHER WETTERDIENST
Other

METEOROLOGISCHES OBSERVATORIUM HOHENPEISSENBERG (MOHP) Postfach 10 04 65 Kaiserleistrasse 29/35
DEUTSCHLAND
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
NATIONAL AND KAPODISTRIAN UNIVERSITY OF ATHENS HELLAS
NATIONAL AND KAPODISTRIAN UNIVERSITY OF ATHENS
Education

DEPT. OF GEOGRAPHY AND CLIMATOLOGY, FACULTY OF GEOLOGY AND GEOENVIRONMENT, LAB. OF CLIMATOLOGY AND ATMOS. ENVIRON. Christou Lada 6
HELLAS
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
ARPA EMILIA-ROMAGNA ITALIA
ARPA EMILIA-ROMAGNA
Other

ARPA-SIM Via Po, 5
ITALIA
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
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE FRANCE
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
Research

LABORATOIRE D'OPTIQUE ATMOSPHERIQUE, UMR 8518' 2 rue des Canonniers
FRANCE
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


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  

Validation of UV-visible aerosol optical thickness retrieved from spectroradiometer measurements
2008
Auteurs : Frédérique Auriol, Colette Brogniez et V. Buchard
Masquer le résumé
Global and diffuse UV-visible solar irradiances are routinely measured since 2003 with a spectroradiometer operated by the Laboratoire d'Optique Atmosphérique (LOA) located in Villeneuve d'Ascq, France. The analysis of the direct irradiance derived by cloudless conditions enables retrieving the aerosol optical thickness (AOT) spectrum in the 330–450 nm range. The site hosts also sunphotometers from the AERONET/PHOTONS network performing routinely measurements of the AOT at several wavelengths. On one hand, comparisons between the spectroradiometer and the sunphotometer AOT at 440 nm as well as, when available, at 340 and 380 nm, show good agreement. On the other hand, the AOT's spectral variations have been compared using the Angström exponents derived from AOT data at 340 and 440 nm for both instruments. The comparisons show that this parameter is difficult to retrieve accurately due to the small wavelength range and due to the weak AOT values. Thus, AOT derived at wavelengths outside the spectroradiometer range by means of an extrapolation using the Angström parameter would be of poor value, whereas, spectroradiometer's spectral AOT could be used for direct validation of other AOT, such as those provided by satellite instruments.
Keywords :
Source : HAL  





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