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Lec12_Ocean_Acidification

Lec12_Ocean_Acidification - Lecture 12 Ocean Acidification...

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Lecture 12: Ocean Acidification CHEM/ENVS 380 Mar 18, 2010 1. What is ocean acidification? What is causing the oceans to acidify? 2. In the future, by about how much might surface ocean pH drop? 3. Acidification by less than a pH unit …. What’s the big deal? 4. What makes the oceans effective absorbers of anthropogenic CO 2 ? 5. What happens to the saturation state of CaCO 3 (s) with increasing acidification? 6. Why worry about ocean acidification? What are the possible effects on the oceanic carbon cycle? 7. What is alkalinity? Average surface ocean pH: Pre-industrial ~8.2 Present ~8.1 End of the century ????
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Doney et al. (2007) Impact of anthropogenic atmospheric nitrogen and sulfur deposition on ocean acidification and the inorganic carbon system, PNAS, 104:14580-14585. What is Making the Oceans Acidic?
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Doney et al. (2007) Impact of anthropogenic atmospheric nitrogen and sulfur deposition on ocean acidification and the inorganic carbon system, PNAS, 104:14580-14585.
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Caldeira and Wickett (2003)
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Pre-Industrial Carbon Cycle Atmosphere 590 Surface ocean 900 Marine Biota 3 Deep ocean 37100 Surface sediment 150 Vegetation Soil & Detritus 2300 Respi- ration 59.6 Primary Production 60 Weathering 0.2 Uplift and Weathering 0.2 Rivers 0.8 Ocean Degassing 70.6 Primary Production 50 Ocean Uptake 70 Respiration 39 90.2 101 11 0.2 Units: 10 15 gC or 10 15 gC yr -1 Fossil fuels 3700 Sedimentary rocks 15,000,000 0.2 From Sarmiento JL and Gruber NG (2002) Sinks for anthropogenic carbon, Physics Today, 55 (8), 30-36.
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Atmosphere 590 +161 Surface ocean 900 +18 Marine Biota 3 Deep ocean 37100 +100 Surface sediment 150 Vegetation Soil & Detritus 2300 +65 -124 R 59.6
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