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Photomineralization Of Organic Carbon In A Eutrophic, Semiarid Estuary
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2020
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Source: Limnol Oceanogr Lett, 5: 246-253
[PDF-923.80 KB]
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Journal Title:Limnology and Oceanography Letters
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Description:The effect of photomineralization on the carbon cycle in a eutrophic, semiarid estuary (Baffin Bay, Texas) was investigated using closed-system incubations. Photochemical production rate of dissolved inorganic carbon ranged from 0.16 to 0.68 μM hr−1, with a daily removal of 0.3∼1.5% of the standing stock of dissolved organic carbon (DOC). The photomineralization rate was negatively correlated with chlorophyll a concentration, suggesting that plankton-derived DOC was less photoreactive to solar radiation. The stable carbon isotope composition (δ13C∼ −18.6‰) of degraded DOC, as calculated using the DIC “Keeling” plot, further indicated high photochemical lability of 13C-enriched DOC in this semiarid environment. Our finding showed that photomineralization of 13C-enriched DOC is an important component of carbon cycle in this system, and this process does not necessarily remove 13C-depleted organic carbon as observed in other coastal systems.
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Source:Limnol Oceanogr Lett, 5: 246-253
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DOI:
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Sea Grant Document Number:TAMU-R-20-024
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Rights Information:CC BY
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