ocean acidification
Post on 21-Mar-2016
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Ocean acidification
• is occurring• negative impacts climate• negative impacts fisheries
Sybil SeitzingerExecutive Director, IGBP
www.IGBP.net
Ocean acidification
(Feely et al., 2008) •*
Atmos CO2
seawater CO2
pH
Ocean acidification
• is occurring• negative impacts climate• negative impacts fisheries
29%
26%
45%
Fate of anthropogenic CO2 emissions (2000-2008)
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
Coccolithophores
NASA image
E. huxleyi
G. oceanica
C. braarudii
C. quadriperforatus
Coccolithophores largest producer of calcite on Earth
Ambient pH
Riebesell et al. 2000Langer et al. 2006
pH disrupts shell formation
NASA image
E. huxleyi
G. oceanica
C. braarudii
C. quadriperforatus
Coccolithophores largest producer of calcite on Earth
Ambient pH pH
Riebesell et al. 2000Langer et al. 2006
Ocean acidification
• is occurring• negative impact climate• negative impacts fisheries
Decreasing pHRies et al. 2009Cooley and Doney 2009
Ocean acidification slows shell calcification
• economic losses
• global shellfish prod. 10.5 billion US$
• disruption livelihoodsN
et c
alci
ficat
ion
rate
(w
t% p
er 6
0 d)
International coordination
www.imber.info
• standardize methods• coordinate field campaigns• synthesis
Summary for Policymakers
Ocean acidification
• is occurring• negative impacts climate• negative impacts fisheries
Still much to be learned!
Sybil SeitzingerExecutive Director, IGBP
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