1. Future developments in CHIMERE

2. 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

3. 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

4. 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.

5. 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)

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

7. Other foreseenable developments Model version with 1/2 hemisphere, US, Sahel, Europe More general default emission interface

8. Agenda V200510: Netcdf interface+F95 recoding, improved NO biogenic emissions, radiation V200603: Saharan dust merged, convection, SOA, Atlantic version