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• W2114328164 abstract "Ancient marine carbon isotope records derived from epeiric sea carbonates can bear a strong influence of local-scale carbon cycling processes. Across the Late Ordovician Mohawkian Sea of eastern Laurentia, the carbon isotope compositions (δ13C) of contemporaneous sediments range from − 2‰ in the interior of the sea to + 2.5‰ along the margin. Here we use a box model to explore the relative importance of carbon fluxes within the Mohawkian Sea from a mass balance perspective. In the model, the Mohawkian Sea carbon reservoir is coupled to but distinct from the ocean and atmosphere carbon reservoirs. At initial steady state conditions, the residence time of carbon in the Mohawkian Sea is less than 10 years. We find that to produce model δ13C values representative of the range in δ13C across the Mohawkian Sea we must divide the sea into an inner region and an outer region and limit dissolved inorganic carbon (DIC) exchange between the two to 15% of the initial steady state unrestricted exchange rate. It is also necessary to supply low δ13C carbon (− 29‰) to the inner region of the sea at a rate of 17.4 × 1012 mol C yr− 1. The required flux of low δ13C carbon could not have been sustained over the long term by remineralization of organic carbon stored in sediments of the inner region of the Mohawkian Sea, and the geographic δ13C pattern is unlikely to have been generated by upwelling along the Sebree Trough. Rather, the low δ13C flux might have been derived from bryophyte-dominated terrestrial ecosystems, suggesting an important role for terrestrial carbon cycling prior to the advent of vascular plants. An interesting feature of the model is that the isotopic compositions of both the epeiric sea and the larger ocean-atmosphere system are sensitive to changes in exchange rates within the epeiric sea. This has important implications for interpreting global δ13C records." @default.
• W2114328164 created "2016-06-24" @default.
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• W2114328164 date "2005-12-01" @default.
• W2114328164 modified "2023-09-25" @default.
• W2114328164 title "Sensitivity of the epeiric sea carbon isotope record to local-scale carbon cycle processes: Tales from the Mohawkian Sea" @default.
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• W2114328164 doi "https://doi.org/10.1016/j.palaeo.2005.06.019" @default.
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