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French Organization in Atmospheric Chemistry Data Assimilation

French Organization in Atmospheric Chemistry Data Assimilation. P. Ricaud, L3AB, Bordeaux, France D. Cariolle, CERFACS, Toulouse, France And French colleagues March 2004. -> Poster by L. El Amraoui, Assimilation of O3 and N2O from Odin. Background. 8 models

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French Organization in Atmospheric Chemistry Data Assimilation

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  1. French Organization in Atmospheric Chemistry Data Assimilation P. Ricaud, L3AB, Bordeaux, France D. Cariolle, CERFACS, Toulouse, France And French colleagues March 2004 -> Poster by L. El Amraoui, Assimilation of O3 and N2O from Odin

  2. Background • 8 models • MOCAGE, ROSE/MSDOL, REPROBUS, CHIMERE, POLAIR, MIMOSA, MIPLASMO-assimilé, Kattatov 4DVAR • 2 main assimilation methods • Sequential, variational • 8 satellite and aircraft data sets • GOMOS, SCIAMACHY, MIPAS, SMR, OSIRIS, MOPITT, IMG, MOSAIC • About 10 laboratories • Paris, Toulouse, Bordeaux, Orléans, Nice • More than 30 people involved

  3. Background -2- • Assimilation techniques applied through scientific themes • Dynamical and chemical processes in the UTLS • O3 and precursors • O3 monitoring • Aircraft impacts in the atmosphere • Pollution and emission • Organization of the atmospheric community • Expertise of one lab to be used efficiently by another one and widely benefits to the entire community • Developement of a common tool (?)

  4. PALM -1- • PALM: Projet d’Assimilation par Logiciel Multiméthode • Developped for the MERCATOR (oceanography) assimilation programme at CERFACS (Toulouse) • 2 objectives • Easy development of assimilation schemes • Exchange of software modules between different teams • Able to assemble an assimilation chain as a sequence of independent software modules

  5. PALM -2- • Modularity and readibility of the applications • Portability of the PALM software • Easier evolution of the assimilation schemes • Use pre-defined tools (linear algebra units, linear interpolation, …) • Parallelism • Exchange of PALM units • Exchange of methods and assimilation schemes

  6. Further informations http://www.cerfacs.fr/~palm

  7. What has been done with PALM so far? • CERFACS: T. Morel and S. Massart • Assimilation method: 3D-VAR (-> 4D-VAR) • Model: MOCAGE (Météo-France) • Satellite data set: GOME O3

  8. Organization Expertise Centres : Obs. operators Direct models and methodology Satellites: GOMOS, Odin, MOPITT, … Models: REPROBUS, MIMOSA, … Methodology: Optimal estimation, 3D and 4DVAR, … PALM 2 PALMed chains: MOCAGE & MSDOL/REPROBUS MOCAGE & LMDz Research chains : Other chains in various labs Assimilation chains Non Operationall ASSET, SAF O3 Ether Data Base Operational GMES External links

  9. Short-term project • Observation operators • GOMOS O3 • Odin/SMR O3 and N2O • MOPITT CO • Models • MOCAGE (already done) • MSDOL/REPROBUS • Methods • 3D-VAR -> 4D-VAR • Optimal interpolation

  10. Mid-Term Project • Multi-instrument and/or multi-platform • Consistancy and covariance error • O3 • Constraints • O3 -> winds • N2O -> NOy • Short-lived species and/or families • Cly: HCl, ClO, ClONO2 • NOy: N2O, HNO3, NO2, NO3 • Radiances and/or brightness temperatures • No retrievals required

  11. Status • Proposed to the CNRS • Positive feedbacks • Still under discussion

  12. Ackowledgements • SA, Paris • LMD, Paris • LSCE, Paris • ENPC, Paris • CERFACS, Toulouse • Météo-France, Toulouse • LA, Toulouse • CNES, Toulouse • L3AB, Bordeaux • LPCE, Orléans • ACRI, Nice

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