Ocean acidification is occurring negative impacts climate negative

Ocean acidification • is occurring • negative impacts climate • negative impacts fisheries

Sybil Seitzinger Executive Director, IGBP www. IGBP. net

Ocean acidification Atmos CO 2 seawater CO 2 p. H • * (Feely et al. , 2008)

Ocean acidification • is occurring • negative impacts climate • negative impacts fisheries

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

Climate & ocean acidification • CO 2 dissolves sw • decreases with p. H

Climate & ocean acidification • CO 2 dissolves sw • decreases with p. H • Organisms remove CO 2 • make biomass • calcium carbonate shells

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

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

Ocean acidification • is occurring • negative impact climate • negative impacts fisheries

• economic losses • global shellfish prod. 10. 5 billion US$ • disruption livelihoods Ries et al. 2009 Cooley and Doney 2009 Net calcification rate (wt% per 60 d) Ocean acidification slows shell calcification Decreasing p. H

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

Summary for Policymakers

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

Sybil Seitzinger Executive Director, IGBP