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• W2024073323 abstract "We have used hydrographic and nutrient data from Cruise No. 49 of the R.V. Atlantis II to the Black Sea to derive a modelfor the flux of carbon, nitrogen and phosphorus through the oxygen-sulfide interface that exists between 125 and 250 meters below the surface. Breaks in the potential temperature-salinity diagram indicate that this region is a linear mixing interval of some 250 meters between the cold winter water and above and warmer, more saline, inflow water beneath. A one-dimensional a advection-diffusion model between these boundaries allows us to calculate the ratio of the vertical eddy coefficient to the vertical advective velocity as being 0·09 km. Fitting the vertical profiles of total carbon dioxide, ammonia and phosphate to this model, we observe consumption rates (J) of all three species (JCO2 = − 1 × 10−6 mole kg−1 yr−1, JNH3 = −0·1 × 10−6 mole kg−1 yr−1 and JPO4 = −0·01 × 10−6 mole kg−1 yr−1). These consumption rates are in contrast to the production rates inferred from the stoichiometric oxidation model. The consumption rates is, in fact, a net value representing the difference between chemosynthetic consumption and respiratory production of carbon dioxide by bacteria living at the oxygen-sulfide interface, and similar arguments hold true for ammonia and phosphate. Experimental measurements of chemosynthetic rate by dark uptake of 14C-bicarbonate yield a value of 36 moles C m−2 yr−1. We suggest that this is too high and attempt to set an upper limit for the true value by calculating βE, the redox buffer capacity of the deep water, and transporting this upwards. From this, we can calculate various carbon dioxide fixation rates, depending upon the metabolic uses to which the oxidizable equivalents are put. The formation of glucose at 50% efficiency would give a carbon fixation rate of 1·50 moles m−2 yr−1. A disturbing feature of the proposed model is tha oxydation of sulfide appears to take place in the absence of oxygen." @default.
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• W2024073323 date "1973-09-01" @default.
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• W2024073323 title "Carbon, nitrogen and phosphorus in the black sea" @default.
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• W2024073323 doi "https://doi.org/10.1016/0011-7471(73)90003-x" @default.
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