French Organization in Atmospheric Chemistry Data Assimilation

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French Organization in Atmospheric Chemistry Data
Assimilation
P. Ricaud, L3AB, Bordeaux, France D. Cariolle,
CERFACS, Toulouse, France And French
colleagues March 2004

-gt Poster by L. El Amraoui, Assimilation of O3
and N2O from Odin
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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

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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 (?)

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PALM -1-

• PALM Projet dAssimilation 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

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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

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Further informations
http//www.cerfacs.fr/palm
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What has been done with PALM so far?

• CERFACS T. Morel and S. Massart
• Assimilation method 3D-VAR (-gt 4D-VAR)
• Model MOCAGE (Météo-France)
• Satellite data set GOME O3

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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
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Short-term project

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

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Mid-Term Project

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

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Status

• Proposed to the CNRS
• Positive feedbacks
• Still under discussion

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Ackowledgements

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