Réseau NDSC-FranceRéseau NDSC-FranceNDACCNDACC
P. Keckhut Coordinateur du NDACC-France
LATMOS / IPSL
Objectifs ScientifiquesObjectifs Scientifiques
Etude de la variabilité et détection des changements d’origine anthropique
Fournir une base de référence notamment pour la validation des expériences spatiales
Permettre des études de processus.
Détection des Changements de la StratosphèreNetwork for the Detection of Stratospheric ChangesFirst discussions 1986, implementation in 1991
InstrumentsInstruments LIDAR profiles
– Raman lidar measuring water vapor– Differential Absorption Lidar (DIAL) measuring O3– Backscatter lidars measuring aerosol– Raman and Rayleigh lidars measuring temperature
MICROWAVE RADIOMETERS– Ozone, water vapor, and ClO profiles
UV/VISIBLE SPECTROMETERS – Column abundance of ozone, NO2, and, at some latitudes,
OClO and BrO FTIR SPECTROMETERS
– Column abundances of a broad range of species including ozone, HCl, NO, NO2, ClONO2, and HNO3
DOBSON/BREWER SONDES– Ozone total column
SONDES– Ozone profiles and Aerosol profile
UV radiation at the ground
Validation des instruments Validation des instruments du réseaudu réseau
Intercomparaisons– Déplacement des instruments sur un
même site.
– Comparaisons successives à partir d’un instrument mobile.
– Utilisation d’expériences spatiales comme transfert géographique.
Tests d’algorithme– Signaux artificiels
– Echanges de données brutes
OZONE
TEMPERATURE
IntercomparaisonSondes ballon
Contribution FrançaiseContribution Française Constitué de 5 stations primaires et de
nombreues stations secondaires Contribution Française: ALOMAR
(69°N), Station Alpine (44°N), La Réunion (21°S), Dumont D’Urville (67°S), Réseau SAOZ
Réseau NDSC depuis 1991. SO INSU depuis 1994.
Données publiques après 2 ans bases de données hébergées à la NOAA.
Exercises d’intercomparaisons. Financements : INSU, IPEV, MATE,
ADEME, CNES, Collectivités locales.
NDACC GoalsNDACC Goals
Detecting trends in overall atmospheric composition and understanding their impacts on the stratosphere and troposphere,
Studying atmospheric composition variability at interannual and longer timescales,
Establishing links and feedbacks between climate change and atmospheric composition,
Calibrating and validating space-based measurements of the atmosphere,
Supporting process-focused scientific field campaigns, and Testing and improving theoretical models of the atmosphere.
NDACC OrganizationNDACC Organization The NDACC Steering Committee consists of two co-chairs, pairs of
PIs representing each of the Working Groups, Independent Scientists who are appointed to act as peer reviewers, and ex-officio members from important NDACC funding agencies.
Science Team Representatives – Dobson & Brewer – FTIR – LIDAR – Microwave – Ozonesondes & Aerosol Sondes – Satellite – Spectral UV – Theory & Analysis– UV/Visible
– Peer and Ex-Officio Representatives
OHP temperature evolution OHP temperature evolution in winter 1996/97in winter 1996/97
Gravity wavesGravity waves
Gravity waves in Doppler wind Gravity waves in Doppler wind
zonal meridionalzonal meridional
Mesospheric inversionsMesospheric inversions
Ozone trendsOzone trends
Multiregression analysis Linear decrease of 5-10%/decade Good agreement between Lidar,
Umcker and SAGE Lack of long data series in the lower
stratosphere Probable discontinuities in
ozonosonde series
Coll. M. Guirlet et S. Godin
Origine of the ozone depletionin the lower stratosphere at mid-latitude ?
Vortex evolution in Vortex evolution in December 1997December 1997
Example of polar filament simulated by the high-resolution transport model MIMOSA (Hauchecorne et al., 2002, Godin et al., 2002)
Study of polar filamentsStudy of polar filaments
Synergie sol-espaceSynergie sol-espace
Valider les expériences spatiales
Assurer la continuité d’expériences spatiales successives et estimer des tendances à l’échelle globale
QuickTime™ et undécompresseur TIFF (non compressé)
sont requis pour visionner cette image.HALOE
GOMOS
NCEP/LIDAR à 1hPa