## תקציר

The ^{17}O excess (^{17}Δ) of dissolved O_{2} has been used, for over a decade, to estimate gross O_{2} production (G^{17}OP) rates in the mixed layer (ML) in many regions of the ocean. This estimate relies on a steady-state balance of O_{2} fluxes, which include air-sea gas exchange, photosynthesis and respiration but notably, not turbulent mixing with O_{2} from the thermocline. In light of recent publications, which showed that neglecting the turbulent flux of O_{2} from the thermocline may lead to inaccurate G^{17}OP estimations, we present a simple correction for the effect of this flux on ML G^{17}OP. The correction is based on a turbulent-flux term between the thermocline and the ML, and use the difference between the ML ^{17}Δ and that of a single data-point below the ML base. Using a numerical model and measured data we compared turbulence-corrected G^{17}OP rates to those calculated without it, and tested the sensitivity of the GOP correction for turbulent flux of O_{2} from the thermocline to several parameters. The main source of uncertainty on the correction is the eddy-diffusivity coefficient, which induces an uncertainty of ~50%. The corrected G^{17}OP rates were 10-90% lower than the previously published uncorrected rates, which implies that a large fraction of the photosynthetic O_{2} in the ML is actually produced in the thermocline.

שפה מקורית | אנגלית |
---|---|

עמודים (מ-עד) | 8363-8371 |

מספר עמודים | 9 |

כתב עת | Biogeosciences |

כרך | 10 |

מספר גיליון | 12 |

מזהי עצם דיגיטלי (DOIs) | |

סטטוס פרסום | פורסם - 20 דצמ׳ 2013 |

פורסם באופן חיצוני | כן |

## טביעת אצבע

להלן מוצגים תחומי המחקר של הפרסום 'Technical note: The effect of vertical turbulent mixing on gross O_{2}production assessments by the triple isotopic composition of dissolved O

_{2}'. יחד הם יוצרים טביעת אצבע ייחודית.