Estimation of vertical mixing in the upper ocean at Station P from chlorofluorcarbons
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ID: 303175
1997
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Abstract
Vertical mixing (K v ) 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 (K v ) and upwelling velocity (w). With constant K v and w, the average value of K v and w was 0.4 ± 0,1 cm 2 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 K v values that increased with time, and modeled CFC concentrations that were higher than observed in the upper increased and lower than observed in the deeper water (200-900 m). Both of these conditions are consistent with K v values that increased with depth. Fitting the one-dimensional advection-diffusion model to the data with K v inversely related to the buoyancy frequency reduced the model-data misfit by 40%, produced consistent estimates of K v the all cruises and reduced the systematic diffrences in the model data misfits. From this model K v and w at the base of the mixed layer were 0.15 ±.04 cm 2 s -1 and 0.5 ± 0.15 m yr -1 , respectively. The results strongly supported a K v that increased with depth. Modeled anthropogenic CO 2 penetration at Station P with the inverse buoyancy frequency scaling of K v , produced results consistent with the observed anthropogenic CO 2 penetration inferred from Σ CO 2 , alkalinity and apparent oxygen utilization measurements.
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openalex_W2090590673
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| Authors | Richard J. Matear, C. S. Wong |
| Journal | journal of marine research |
| Year | 1997 |
| DOI |
10.1357/0022240973224300
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| URL | |
| Keywords | Keywords not found |
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