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Réseau NDSC-France NDACC

Réseau NDSC-France NDACC. P. Keckhut Coordinateur du NDACC-France LATMOS / IPSL. Objectifs Scientifiques. Détection des Changements de la Stratosphère Network for the Detection of Stratospheric Changes First discussions 1986, implementation in 1991.

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Réseau NDSC-France NDACC

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  1. Réseau NDSC-FranceNDACC P. Keckhut Coordinateur du NDACC-France LATMOS / IPSL

  2. Objectifs Scientifiques Détection des Changements de la Stratosphère Network for the Detection of Stratospheric Changes First discussions 1986, implementation in 1991 • 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.

  3. Instruments • 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

  4. Validation des instruments du 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 Intercomparaison Sondes ballon TEMPERATURE

  5. Contribution 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.

  6. NDACC 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.

  7. NDACC 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

  8. OHP temperature evolution in winter 1996/97

  9. Gravity waves

  10. Gravity waves in Doppler wind zonal meridional

  11. Mesospheric inversions

  12. Ozone 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 depletion in the lower stratosphere at mid-latitude ?

  13. Vortex evolution in December 1997

  14. Study of polar filaments Example of polar filament simulated by the high-resolution transport model MIMOSA(Hauchecorne et al., 2002, Godin et al., 2002)

  15. Synergie sol-espace • Valider les expériences spatiales • Assurer la continuité d’expériences spatiales successives et estimer des tendances à l’échelle globale HALOE GOMOS NCEP/LIDAR à 1hPa

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