Future developments in CHIMERE

General objectives

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

Weakest points

• Research: More realism in physics• Operational: higher accuracy

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

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.

Chemistry

• Inclusion of other chemical mechanisms, richer in higher alcanes and more reactive species: SAPRC, RACM, Szopa&Aumont, …

• Update of constants for MELCHIOR

• Secondary organics (see B Bessagnet’s talk)

Biosphere interface

• Improve NOx biogenic emissions from INRA collaboration

• Biogenic emissions from NATAIR EU project

• Coupling with a more sophisticated biosphere model (ORCHIDEE?)

Other foreseenable developments

• Model version with 1/2 hemisphere, US, Sahel, Europe

• More general default emission interface

Agenda

• V200510: Netcdf interface+F95 recoding, improved NO biogenic emissions, radiation

• V200603: Saharan dust merged, convection, SOA, Atlantic version