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- Title
Technical note: The effect of vertical turbulent mixing on gross O<sub>2</sub> production assessments by the triple isotopic composition of dissolved O<sub>2</sub>.
- Authors
Wurgaft, E.; Shamir, O.; Angert, A.
- Abstract
The 17O-excess (17Δ) of dissolved O2 has been used, for over a decade, to estimate gross O2 production (G17OP) rates in the mixed layer (ML) in many regions of the ocean. This estimate relies on a steady-state balance of O2 fluxes, which include air-sea gas exchange, photosynthesis and respiration but notably, not turbulent mixing with O2 from the thermocline. In light of recent publications, which showed that neglecting the turbulent flux may lead to inaccurate G17OP estimations, we present a simple correction for the effect of turbulent flux of O2 from the thermocline on ML G17OP. The correction is based on a turbulent-flux term between the thermocline and the ML, and use the difference between the ML 17Δ and that of a single data-point below the ML base. Using a numerical model and measured data we compared turbulence-corrected G17OP rates to those calculated without it. The corrected G17OP rates were 10-90% lower than the uncorrected rates, which implies that a large fraction of the photosyn-thetic O2 in the ML is actually produced in the thermocline.
- Subjects
TURBULENT mixing; DISSOLVED oxygen in water; PHOTOSYNTHESIS; MARINE mammal respiration; GAS exchange in plants; THERMOCLINES (Oceanography)
- Publication
Biogeosciences Discussions, 2013, Vol 10, Issue 8, p14239
- ISSN
1810-6277
- Publication type
Article
- DOI
10.5194/bgd-10-14239-2013