1. Ocean acidification is occurring negative impacts climate negative impacts fisheries

2. Sybil Seitzinger Executive Director, IGBP www.IGBP.net

3. Ocean acidification (Feely et al., 2008) * Atmos CO2 seawater CO2 pH

4. Ocean acidification is occurring negative impacts climate negative impacts fisheries

5. 29% 26% 45% Fate of anthropogenic CO 2 emissions (2000-2008) Le Quéré et al. 2009, Nature geoscience; Canadell et al. 2007, PNAS, updated +

6. Climate & ocean acidification CO 2 dissolves sw decreases with pH

7. Climate & ocean acidification CO 2 dissolves sw decreases with pH Organisms remove CO 2 make biomass calcium carbonate shells

8. Coccolithophores NASA image E. huxleyi G. oceanica C. braarudii C. quadriperforatus Coccolithophores largest producer of calcite on Earth Ambient pH Riebesell et al. 2000 Langer et al. 2006

9. pH disrupts shell formation NASA image E. huxleyi G. oceanica C. braarudii C. quadriperforatus Coccolithophores largest producer of calcite on Earth Ambient pHpH Riebesell et al. 2000 Langer et al. 2006

10. Ocean acidification is occurring negative impact climate negative impacts fisheries

11. Decreasing pH Ries et al. 2009 Cooley and Doney 2009 Ocean acidification slows shell calcification economic losses global shellfish prod. 10.5 billion US$ disruption livelihoods Net calcification rate (wt% per 60 d)

12. International coordination www.imber.info standardize methods coordinate field campaigns synthesis

13. Summary for Policymakers

14. Ocean acidification is occurring negative impacts climate negative impacts fisheries Still much to be learned!

15. Sybil Seitzinger Executive Director, IGBP