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Free Content Estimation of vertical mixing in the upper ocean at Station P from chlorofluorcarbons

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Abstract:

Vertical mixing (Kv) in the upper ocean is estimated from chlorofluorocarbons (CFC's) F-11 and F-12 data collected on 5 cruises (1982, 1985, 1992, 1993, 1995) near Station P (50N, 145W). A one-dimensional advection-diffusion model was fitted to the data from each cruise to estimate vertical mixing (Kv) and upwelling velocity (w). With constant Kv and w, the average value of Kv and w was 0.4 ± 0.1 cm2 s−1 and 1.2 ± 0.4 m yr−1 respectively for the depth range 0–900 m below the base of the mixed layer. This case produced Kv values that increased with time, and modeled CFC concentrations that were higher than observed in the upper 200 m and lower than observed in the deeper water (200–900 m). Both of these conditions are consistent with Kv values that increased with depth. Fitting the one-dimensional advection-diffusion model to the data with Kv inversely related to the buoyancy frequency reduced the model-data misfit by 40%, produced consistent estimates of Kv for all cruises and reduced the systematic differences in the model data misfits. From this model Kv and w at the base of the mixed layer were 0.15 ± 0.4 cm2 s−1 and 0.5 ± 0.15 m yr−1, respectively. The results strongly supported a Kv that increased with depth. Modeled anthropogenic CO2 penetration at Station P with the inverse buoyancy frequency scaling of Kv, produced results consistent with the observed anthropogenic CO2 penetration inferred from Σ CO2, alkalinity and apparent oxygen utilization measurements.

Document Type: Research Article

DOI: https://doi.org/10.1357/0022240973224300

Publication date: 1997-05-01

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  • The Journal of Marine Research publishes peer-reviewed research articles covering a broad array of topics in physical, biological and chemical oceanography. Articles that deal with processes, as well as those that report significant observations, are welcome. In the area of biology, studies involving coupling between ecological and physical processes are preferred over those that report systematics. Authors benefit from thorough reviews of their manuscripts, where an attempt is made to maximize clarity. The time between submission and publication is kept to a minimum; there is no page charge.
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