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- W2897948654 abstract "Abstract The fraction of primary production exported out of the surface ocean, known as the export ratio ( ef ratio), is often used to assess how various factors, including temperature, primary production, phytoplankton size, and community structure, affect the export efficiency of an ecosystem. To investigate possible causes for reported discrepancies in the dominant factors influencing the export efficiency, we develop a metabolism‐based mechanistic model of the ef ratio. Consistent with earlier studies, we find based on theoretical considerations that the ef ratio is a negative function of temperature. We show that the ef ratio depends on the optical depth, defined as the physical depth times the light attenuation coefficient. As a result, varying light attenuation may confound the interpretation of ef ratio when measured at a fixed depth (e.g., 100 m) or at the base of the mixed layer. Finally, we decompose the contribution of individual factors on the seasonality of the ef ratio. Our results show that at high latitudes, the ef ratio at the base of mixed layer is strongly influenced by mixed layer depth and surface irradiation on seasonal time scales. Future studies should report the ef ratio at the base of the euphotic layer or account for the effect of varying light attenuation if measured at a different depth. Overall, our modeling study highlights the large number of factors confounding the interpretation of field observations of the ef ratio." @default.
- W2897948654 created "2018-10-26" @default.
- W2897948654 creator A5047927389 @default.
- W2897948654 creator A5077357390 @default.
- W2897948654 date "2018-11-01" @default.
- W2897948654 modified "2023-09-26" @default.
- W2897948654 title "Theoretical Considerations on Factors Confounding the Interpretation of the Oceanic Carbon Export Ratio" @default.
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- W2897948654 doi "https://doi.org/10.1029/2018gb006003" @default.
- W2897948654 hasPublicationYear "2018" @default.
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