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Ocean acidification

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... coordination of field campaigns etc. ... Seawater data: David Karl Chemistry is well known, predicted over 20 years ago Consequences for climate, ... – PowerPoint PPT presentation

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Title: Ocean acidification


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

2
  • Sybil Seitzinger
  • Executive Director, IGBP

www.IGBP.net
3
Ocean acidification
Atmos CO2
seawater CO2
pH
  • (Feely et al., 2008)

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

5
Fate of anthropogenic CO2 emissions (2000-2008)

Le Quéré et al. 2009, Nature geoscience Canadell
et al. 2007, PNAS, updated
6
Climate ocean acidification
  • CO2 dissolves sw
  • decreases with pH

7
Climate ocean acidification
  • CO2 dissolves sw
  • decreases with pH
  • Organisms remove CO2
  • make biomass
  • calcium carbonate shells

8
Coccolithophores
Ambient pH
Coccolithophores largest producer of calcite on
Earth
NASA image
Riebesell et al. 2000 Langer et al. 2006
9
pH disrupts shell formation
Ambient pH
pH
Coccolithophores largest producer of calcite on
Earth
NASA image
Riebesell et al. 2000 Langer et al. 2006
10
Ocean acidification
  • is occurring
  • negative impact climate
  • negative impacts fisheries

11
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
12
International coordination
  • standardize methods
  • coordinate field campaigns
  • synthesis

www.imber.info
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

16
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