Physics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982e%26psl..60...17r&link_type=abstract
Earth and Planetary Science Letters, Volume 60, Issue 1, p. 17-26.
Physics
4
Scientific paper
Recent radium measurements from the near-surface Caribbean Sea are presented. The surface horizontal and vertical distributions of 226Ra are essentially the same as reported by Szabo et al. (1967) for the early 1960's. The 226Ra activity at the surface is relatively uniform across the Caribbean, with an average of 8.2+/-0.4 dpm/100 kg. The subsurface distribution to ~200 m averages 7.8+/-0.4 dpm/100 kg and increases slowly below 200 m. reaching ~9.5 dpm/100 kg at 560 m. In contrast to 226Ra, the surface concentration of 228Ra was much more variable in both time and space. An average increase of 33% was found between 1968 and 1976 in the western Caribbean and during both years an anomalously high 228Ra activity was found in the eastern Caribbean. These data support previous hypotheses that water entering the eastern Caribbean has been enriched in 228Ra prior to entry and that variable mixing of the Atlantic water masses found to the northeast and southeast of the Lesser Antilles may produce temporal variations in the near-surface 228Ra activity. Scatter plots of 228Ra vs. salinity and sigma-t indicate that the near-surface vertical distribution of 228Ra in the Caribbean Sea is predominantly influenced by advection. Thus 228Ra cannot be used to study near-surface vertical mixing rates in this region.
Present address: Department of Marine Science, University of South Florida, 830 First Street South, St. Petersburg, FL 33701, U.S.A.
Reid David F.
Sackett William M.
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