Isotopic fractionations during oxygen consumption and carbonate dissolution within the North Atlantic Deep Water

Details Isotopic fractionations during oxygen consumption and carbonate dissolution within the North Atlantic Deep Water Isotopic fractionations during oxygen consumption and carbonate dissolution within the North Atlantic Deep Water

Sep 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..49..485k&link_type=abstract

Earth and Planetary Science Letters, Volume 49, Issue 2, p. 485-498.

Physics

1

Scientific paper

The trajectory of the North Atlantic Deep Water is traced from 65°N to 20°N latitude. Along this track the dissolved O2 decreases, the δ18O of the dissolved O2 increases, and the 14C content of the water decreases. From these observations the rate of in-situ O2 utilization in the deep water is calculated to be 0.10 μmol kg-1 yr-1. As was observed previously in the Pacific, the δ18O data presented here indicate that the utilization is probably caused by bacterial respiration. Carbon dioxide is being added to the water at the rate of 0.07 μmol kg-1 yr-1 from the oxidation of this organic matter. An additional 0.12 μmol kg-1 yr-1 of CO2 is derived from the dissolution of particles of CaCO3.

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