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- W2777498045 abstract "The magnitude of diffusive carbon dioxide (CO2) and methane (CH4) emission from man-made reservoirs is uncertain because the spatial variability generally is not well-represented. Here, we examine the spatial variability and its drivers for partial pressure, gas-exchange velocity (k), and diffusive flux of CO2 and CH4 in three tropical reservoirs using spatially resolved measurements of both gas concentrations and k. We observed high spatial variability in CO2 and CH4 concentrations and flux within all three reservoirs, with river inflow areas generally displaying elevated CH4 concentrations. Conversely, areas close to the dam are generally characterized by low concentrations and are therefore not likely to be representative for the whole system. A large share (44–83%) of the within-reservoir variability of gas concentration was explained by dissolved oxygen, pH, chlorophyll, water depth, and within-reservoir location. High spatial variability in k was observed, and kCH4 was persistently higher (on average, 2.5 times more) than kCO2. Not accounting for the within-reservoir variability in concentrations and k may lead to up to 80% underestimation of whole-system diffusive emission of CO2 and CH4. Our findings provide valuable information on how to develop field-sampling strategies to reliably capture the spatial heterogeneity of diffusive carbon fluxes from reservoirs." @default.
- W2777498045 created "2018-01-05" @default.
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- W2777498045 date "2018-01-03" @default.
- W2777498045 modified "2023-10-16" @default.
- W2777498045 title "Spatially Resolved Measurements of CO<sub>2</sub> and CH<sub>4</sub> Concentration and Gas-Exchange Velocity Highly Influence Carbon-Emission Estimates of Reservoirs" @default.
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- W2777498045 doi "https://doi.org/10.1021/acs.est.7b05138" @default.
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- W2777498045 hasPublicationYear "2018" @default.
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