Future developments in CHIMERE

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Future developments in CHIMERE
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General objectives

• Research More realism in physics
• Operational higher accuracy

Weakest points

• Radiation/clouds/aerosols
• Convection
• Secondary Organic Aerosols
• Biosphere interface
• Chemistry
• Saharan dust
• Code structure/language

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Radiation/Photolysis

• Include TUV actinic flux calculation within model
  iterations in order to incorporate 3D cloud
  effects (cloud albedo, absorption).
• Also will help couple aerosols and photolysis
• Need of a fast version of TUV, with
  photolysis deduced from a few (3-4) wavelengths.
• STATUS first tests OK, a lot of work to be done

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Convection

• Inclusion of the Kerry Emmanuel scheme for
  mass-flux transport due to deep convection ?
  improve simulation for tropical countries.
• Inclusion of a PBL mass-flux vertical mixing
  scheme.

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Chemistry

• Inclusion of other chemical mechanisms, richer in
  higher alcanes and more reactive species SAPRC,
  RACM, SzopaAumont,
• Update of constants for MELCHIOR
• Secondary organics (see B Bessagnets talk)

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Biosphere interface

• Improve NOx biogenic emissions from INRA
  collaboration
• Biogenic emissions from NATAIR EU project
• Coupling with a more sophisticated biosphere
  model (ORCHIDEE?)

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Other foreseenable developments

• Model version with 1/2 hemisphere, US, Sahel,
  Europe
• More general default emission interface

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Agenda

• V200510 Netcdf interfaceF95 recoding, improved
  NO biogenic emissions, radiation
• V200603 Saharan dust merged, convection, SOA,
  Atlantic version