Physics
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976e%26psl..32..236k&link_type=abstract
Earth and Planetary Science Letters, Volume 32, Issue 2, p. 236-248.
Physics
8
Scientific paper
226Ra data on eleven vertical profiles taken during the GEOSECS program from the Antarctic Ocean and its vicinity in both the Atlantic and the Pacific are presented. Replicate measurements were made on each sample using the Rn-emanation method. The precision (1 σ) based on triplicate analyses averages about +/-2.5%. Waters all around the Antarctic continent below 2 km depth appear to exhibit a uniform 226Ra concentration of 21.5 +/- 1 dpm/100 kg, except perhaps locally such as the Ross Sea and the Drake Passage where small variations may be present. Higher in the water column, the 226Ra contents decrease toward the surface with gradients which vary as a function of the influence exerted by the Antarctic Convergence. Across this oceanic front, a north-to-south increase of 226Ra occurs (the increase being the largest near the surface: from 8 to 18 dpm/100 kg), reflecting the combining effect of deep-water upwelling and meridional water mixing. The core layer of the Antarctic Intermediate Water contains about 14 dpm/100 kg of 226Ra and that of the Circumpolar Intermediate Water (O2 minimum and local T maximum) about 18 dpm/100 kg. To a first approximation, 226Ra covaries with Si in the circumpolar waters.
Ku Teh-Lung
Lin Mu-Ching
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