1. BGC Working Group Meeting March 2006 Update on Coupled Runs with BGC in CCSM3 Keith Lindsay, Peter Thornton & many, many others

2. BGC Working Group Meeting March 2006 Outline BGC Components being used Sequential Coupling & Progress Results What will be done next Discussion

3. BGC Working Group Meeting March 2006 Phytoplankton Groups Fixed C/N/P, Variable Fe/C, Chl/C, Si/C Diatoms (C, Chl, Fe, Si) Diazotrophs (C, Chl, Fe) Picoplankton / Coccolithophores (C, Chl, Fe, CaCO3) Zooplankton (C) Nutrients Ammonium Nitrate Phosphate Silicate Iron Dissolved Organic Material (C, N, P, Fe) Sinking Particulate Material (C, (N, P), Fe, Si, CaCO3, Dust) ECO-C3 Marine Ecosystem Component

4. BGC Working Group Meeting March 2006 CLM3.CN: Summary Model Structure and Fluxes Leaf Fine Root Dead Stem Dead Coarse Root Live Stem Live Coarse Root Previous Storage Current Storage Wood Litter (CWD) Litter 1 (Labile) Litter 2 (Cellulose) Litter 3 (Lignin) SOM 1 (fast) SOM 2 (medium) SOM 3 (slow) Plant Pools Litter Pools Soil Organic Matter Pools

5. BGC Working Group Meeting March 2006 Outline BGC Components being used Sequential Coupling & Progress Results What will be done next Discussion

6. BGC Working Group Meeting March 2006 Spin-up Strategy Reminder: Carbon inventory adjusts to climate Spin-up Goal: find C distribution in eqm with the model climate Three flavors of CO 2 : –Tracers CO 2 in atm = CO 2-tracer (x,y,z,t) (diagnostic of surface fluxes) 3+ inert tracers: net land+ocean; net land; net ocean –Biogeochemistry CO 2 = CO 2-tracer (x,y,sfc,t) To drive fluxes into ocean Sensed by terrestrial photosynthesis –Radiative CO 2 = CO 2-tracer (x,y,column,t)

7. BGC Working Group Meeting March 2006 Coupling and Spin-up ocean BGC spin-up active ocean O(10 3 )y land BGC spin-up active land/atm clim. or coupled model SSTs O(10 2 )y coupled physics land/ocn BGC adjustment C Tracer =prog C BGC =280 C Rad =280 C Tracer =prog C BGC =prog C Rad =280 C Tracer =prog C BGC =prog C Rad =prog coupled physics land/ocn/atm BGC adjustment coupled physics fully coupled carbon-climate Control runSpin-up 0 100 yr Spin-up 1 100 yr

8. BGC Working Group Meeting March 2006 Outline BGC Components being used Sequential Coupling & Progress Results What will be done next Discussion

9. BGC Working Group Meeting March 2006

18. Outline BGC Components being used Sequential Coupling & Progress Results What will be done next Discussion

19. BGC Working Group Meeting March 2006

21. Outline BGC Components being used Sequential Coupling & Progress Results What will be done next Discussion