chapter_08 Part 3

chapter_08 Part 3 - V The Inorganic Carbon Cycle V f...

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V. The Inorganic Carbon Cycle V. The Inorganic Carbon Cycle f. Carbonate Mineral Deposition i. Particulate material deposited near river deltas ii. Dissolved material mix with seawater iii. Diatoms, radiolarians, and sponges remove dissolved silica from seawater iii. Foraminifera, coccolothophorids, corals, and shellfish produce solid calaium carbonate shells and skeletons
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V. The Inorganic Carbon Cycle V. The Inorganic Carbon Cycle f. Carbonate Mineral Deposition v. calcium carbonate producers cause a shift in the ocean’s carbon chemistry 1. Enhanced carbonic acid 2. Reduce bicarbonate and pH 3. Increase concentration of dissolved CO 2 4. Creates CO 2 gradient between ocean and atmosphere 5. CO 2 from ocean to atmosphere 6. Some carbonate producers photosynthesize - Lower CO 2 7. Most phytoplankton don’t create shells so there is an overall decrease in CO 2
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V. The Inorganic Carbon Cycle V. The Inorganic Carbon Cycle vi. Shells and skeletons collect on the seafloor 1. Eventually become limestone 2. Shallow waters are saturated with respect to CaCO 3 vii. Deep waters have a higher composition of carbonic acid due to decomposition 1. Corrosive to CaCO 3 2. Under saturated with respect to CaCO 3 3. Particles dissolve slowly 4. Carbonate compensation depth- particles completely dissolve 3 2 3 3 2 2 CO H CaCO HCO Ca + + - +
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Distribution of Calcium Carbonate Rich Seafloor Sediments
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V. The Inorganic Carbon Cycle V. The Inorganic Carbon Cycle
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chapter_08 Part 3 - V The Inorganic Carbon Cycle V f...

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