160 likes | 304 Views
Ocean acidification. is occurring negative impacts climate negative impacts fisheries. Sybil Seitzinger Executive Director, IGBP. www.IGBP.net. Ocean acidification. Atmos CO2. seawater CO2. pH. (Feely et al., 2008) *. Ocean acidification. is occurring negative impacts climate
E N D
Ocean acidification • is occurring • negative impacts climate • negative impacts fisheries
Sybil Seitzinger Executive Director, IGBP www.IGBP.net
Ocean acidification Atmos CO2 seawater CO2 pH • (Feely et al., 2008) • *
Ocean acidification • is occurring • negative impacts climate • negative impacts fisheries
Fate of anthropogenic CO2 emissions (2000-2008) 45% 29% 26% + Le Quéré et al. 2009, Nature geoscience; Canadell et al. 2007, PNAS, updated
Climate & ocean acidification • CO2 dissolves sw • decreases with pH
Climate & ocean acidification • CO2 dissolves sw • decreases with pH • Organisms remove CO2 • make biomass • calcium carbonate shells
G. oceanica E. huxleyi C. quadriperforatus C. braarudii Coccolithophores Ambient pH Coccolithophores largest producer of calcite on Earth NASA image Riebesell et al. 2000 Langer et al. 2006
G. oceanica E. huxleyi C. quadriperforatus C. braarudii pH disrupts shell formation Ambient pH pH Coccolithophores largest producer of calcite on Earth NASA image Riebesell et al. 2000 Langer et al. 2006
Ocean acidification • is occurring • negative impact climate • negative impacts fisheries
Ocean acidification slows shell calcification • economic losses • global shellfish prod. 10.5 billion US$ • disruption livelihoods Net calcification rate (wt% per 60 d) Ries et al. 2009 Cooley and Doney 2009 Decreasing pH
International coordination • standardize methods • coordinate field campaigns • synthesis www.imber.info
Ocean acidification is occurring negative impacts climate negative impacts fisheries Still much to be learned!
Sybil Seitzinger Executive Director, IGBP