Carbon cycling in coastal sediments: 1. A quantitative estimate of the remineralization of organic carbon in the sediments of Buzzards Bay, MA

Details Carbon cycling in coastal sediments: 1. A quantitative estimate of the remineralization of organic carbon in the sediments of Buzzards Bay, MA Carbon cycling in coastal sediments: 1. A quantitative estimate of the remineralization of organic carbon in the sediments of Buzzards Bay, MA

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1531m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 6, pp.1531-1543

Mathematics

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Scientific paper

Seasonal remineralization rates of organic carbon are calculated in the top 20-30 cm of biologically irrigated, organic-rich sediments of Buzzards Bay, MA. Six cores were collected over a period of two years, and the pore water concentrations of the following species were measured: dissolved inorganic carbon ( CO 2 ), PO 3- 4 , H 2 S , Alk, and Ca 2+ . Overall, these constituents showed large gradients with depth, which are larger in summer than in winter. Remineralization rates in the sediments were estimated by applying a non-local exchange, vertical molecular diffusion, reaction model to the CO 2 depth profiles. The major processes affecting the pore water concentration of CO 2 described in the model are diffusion, irrigation, and the oxidation of organic carbon. The calculated remineralization rates varied seasonally with the high of 7.5 × 10 -9 mol/L-sec observed in August 84 and the low (0.6 × 10 -9 ) in December 1983. The remineralization rates were dependent on the amount of irrigation in the sediments. It was possible to calculate remineralization rates between 0 and 20 cm because the amount of irrigation was well-characterized at this site. We calculated that 69 gC / m 2 are oxidized annually and 5-33 gC/m 2 -yr are buried. It appears that there is a highly reactive portion of organic matter which is oxidized at the sediment water interface. Examination of the Alk and dissolved Ca 2+ profiles indicates that there was significant production of acid which dissolved CaCO 3 in the spring and early summer.

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