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E. Füri , D.R. Hilton, M. Tryon, K. Brown

E. Füri , D.R. Hilton, M. Tryon, K. Brown. Towards quantifying volatile fluxes and origins from the Costa Rica fore-arc using novel submarine instrumentation.

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E. Füri , D.R. Hilton, M. Tryon, K. Brown

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  1. E. Füri, D.R. Hilton, M. Tryon, K. Brown Towards quantifying volatile fluxes and origins from the Costa Rica fore-arc using novel submarine instrumentation Mound 12: Extremely low 13CCO2 values show that most of the ascending methane is oxidized due to the lower flow rates. Mound 11: 13CCO2 values are consistent with input of 13C-enriched DIC from deep methanogenesis.

  2. Carbon budget for the Costa Rica fore-arc: Subducted sedimentary C potentially available to the fore-arc region: [Li and Bebout, 2005, de Leuw et al., 2007] 6.9 × 107gC km-1yr-1 Extrapolated carbon output at the fore-arc (for 60 mounds): Methane [Mau et al., 2006]6.3 × 105gC km-1yr-1 CO2[this study] 4.9 × 103gC km-1yr-1 The total carbon emission (CO2 plus methane) from mounds at the Costa Rica margin appears significantly lower than the amount of carbon that is potentially available to the fore-arc region by subducted sedimentary input via the trench. The total carbon emission (CO2 plus methane) from mounds at the Costa Rica margin appears to be significantly lower than the amount of carbon that is potentially available to the fore-arc region by subducted sedimentary input via the trench.

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