Combined effects of photosynthesis and calcification on the partial pressure of carbon dioxide in seawater |
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Authors: | Atsushi Suzuki |
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Affiliation: | (1) Marine Geology Department, Geological Survey of Japan, 305 Tsukuba, Japan;(2) Australian Institute of Marine Science, 4810 Townsville, Queensland, Australia |
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Abstract: | The effects of marine photosynthesis and calcification on the partial pressure of carbon dioxide in seawater (P CO 2) are examined in the light of recent studies and using original model calculations. The ratio of organic carbon to inorganic carbon production (R OI) determines whether an ecosystem is a net sink or source for atmospheric CO2. TheP CO 2 maintains its initial value when the photosynthetic rate is approximately 0.6 times the calcification rate under normal sea surface condition. In case of higherR OI, theP CO 2 decreases and seawater can absorb atmospheric CO2. The ratio of organic carbon to inorganic carbon production can be used as a potential indicator of sink-source behavior in aquatic photo-calcifying systems. |
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Keywords: | Carbon dioxide photosynthesis calcification metabolism chemical equilibrium gas exchange seawater partial pressure |
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