Physics
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32..331r&link_type=abstract
Earth and Planetary Science Letters, Volume 32, Issue 2, p. 331-341.
Physics
1
Scientific paper
A 14C balance for the Eastern Caribbean deep water indicates the average inflow of Atlantic water into the basin to be 2.3 × 105 m3/sec (+/-30%), or about 2-4 times the values estimated previously. The balance uses a model representation of the deep-water turnover, and is based on 14C concentrations at a station in the Venezuelan Basin which average Δ 14C = 89‰ below 800 m depth with a total range of only 9‰, as well as on a 14C concentration of the Atlantic inflow of Δ 14C = -71%. as obtained from measurements outside the Antilles Arch. The turnover time of the basin water below 2500 m depth is 55 years, which corresponds to an average upwelling velocity at this depth of about 35 m/year. With such upwelling, the temperature profile below 1800 m (the depth of the sill determining the inflow of new water) requires a vertical eddy diffusivity of about 5 cm2/sec. The oxygen consumption, and silica and CO2 regeneration, rates below 2500 m depth are obtained as -0.18, + 0.08, and + 0.2 μmole kg-1 yr-1, respectively. The CO2 regeneration has but a negligible effect on the 14C balance.
Münnich Karl Otto
Ribbat Bruno
Roether Wolfgang
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