In:
Journal of Geophysical Research: Oceans, American Geophysical Union (AGU), Vol. 90, No. C4 ( 1985-07-20), p. 6971-6982
Abstract:
Measurements of the concentrations of the artificial radionuclides 3 H, 137 Cs, and 90 Sr in the northern Irminger Sea in 1972 and 1981 are reported. In both years, tracer measurements from this area included data from samples of the dense overflow water from the north through Denmark Strait. All three tracers were strongly correlated inversely with salinity in the dense outflows—the tracer maxima being related directly to the salinity minimum. When the tracer characteristics in the outflows in 1972 and 1981 were compared, concentrations of all in 1981 were observed to be about double the 1972 values. The individual tracer concentrations—on a decay‐corrected, density‐normalized basis—were higher in increasing order: 90 Sr (+93%) 〈 3 H (+115%) 〈 137 Cs (+150%). The relatively greater increases for 3 H and 137 Cs were attributed to contributions of new sources of these tracers in northern surface waters: the 3 H source is argued to derive from atmospheric hydrological recycling, whereas the 137 Cs source is identified as the input to the Greenland and Iceland seas of advected European nuclear fuel reprocessing wastes. Both the tracer and hydrographic data are used to identify northern locations of intermediate water formation capable of supplying the observed dense overflow water characteristics. It is argued, from the time taken for the overflow water to reflect the new surface 137 Cs source, that transport from the source to the overflow can be quite rapid (about 2 years).
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/JC090iC04p06971
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1985
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