Download - Ocean acidification
![Page 1: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/1.jpg)
Ocean acidification
• is occurring• negative impacts climate• negative impacts fisheries
![Page 2: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/2.jpg)
Sybil SeitzingerExecutive Director, IGBP
www.IGBP.net
![Page 3: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/3.jpg)
Ocean acidification
(Feely et al., 2008) •*
Atmos CO2
seawater CO2
pH
![Page 4: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/4.jpg)
Ocean acidification
• is occurring• negative impacts climate• negative impacts fisheries
![Page 5: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/5.jpg)
29%
26%
45%
Fate of anthropogenic CO2 emissions (2000-2008)
Le Quéré et al. 2009, Nature geoscience; Canadell et al. 2007, PNAS, updated
+
![Page 6: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/6.jpg)
Climate & ocean acidification
• CO2 dissolves sw • decreases with pH
![Page 7: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/7.jpg)
Climate & ocean acidification
• CO2 dissolves sw • decreases with pH
• Organisms remove CO2
• make biomass• calcium carbonate shells
![Page 8: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/8.jpg)
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
![Page 9: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/9.jpg)
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
![Page 10: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/10.jpg)
Ocean acidification
• is occurring• negative impact climate• negative impacts fisheries
![Page 11: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/11.jpg)
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)
![Page 12: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/12.jpg)
International coordination
www.imber.info
• standardize methods• coordinate field campaigns• synthesis
![Page 13: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/13.jpg)
Summary for Policymakers
![Page 14: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/14.jpg)
Ocean acidification
• is occurring• negative impacts climate• negative impacts fisheries
Still much to be learned!
![Page 15: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/15.jpg)
Sybil SeitzingerExecutive Director, IGBP
![Page 16: Ocean acidification](https://reader035.vdocument.in/reader035/viewer/2022062218/56815667550346895dc418e6/html5/thumbnails/16.jpg)