The relationship between pore water carbon isotopic composition and bottom water oxygen concentration

Details The relationship between pore water carbon isotopic composition and bottom water oxygen concentration The relationship between pore water carbon isotopic composition and bottom water oxygen concentration

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.1169m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 52, Issue 5, pp.1169-1178

Computer Science

11

Scientific paper

We present pore water 13 C profiles from the Western North Atlantic and the Eastern Pacific oceans, and interpret them using a stoichiometric model of the relationship between carbon isotopic composition and oxygen concentration. Pore water 13 C at the depth in the sediments where oxygen approaches zero is largely determined by the oxygen concentration of the overlying bottom water, although sulfate reduction adds a significant amount of isotopically light carbon at some locations. The 13 C difference between bottom water and pore water at O 2 = 0 (" 13 C") increases from 1 %. in sediments of three low bottom water oxygen basins in the Southern California Borderlands to 4%. in sediments underlying well oxygenated water in the Western North Atlantic. We suggest that the relationship between bottom water oxygen and 13 C could form the basis for a new way to use the benthic foraminifera 13 C record to estimate bottom water oxygen concentration. Paleo-oxygen values derived from a pair of benthic foraminifera species which record the bottom water/pore water ( O 2 = 0) 13 C difference will be independent of the preformed 13 C of the deep water mass.

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