Radium isotopes in sub-Arctic waters |
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| Authors: | Willard S Moore Herbert W Feely Yuan-Hui Li |
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| Institution: | Department of Geology, University of South Carolina, Columbia, SC 29208 U.S.A.;Lamont-Doherty Geological Observatory of Columbia University, Palisades, NY 10964 U.S.A. |
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| Abstract: | Measurements of the228Ra/226Ra activity ratio in the waters of the Greenland, Norwegian and Labrador Seas and Baffin Bay reveal strong horizontal gradients in the surface waters. The coastal waters are dominated by228Ra injection from nearshore sediments. There is an inverse correlation between the228Ra/226Ra activity ratio and salinity in the 30–36‰ salinity range. Vertical profiles indicate that the228Ra/226Ra activity ratio is also strongly coupled toσθ except for some regions where228Ra is being injected into higher density water as these isopycnals intersect coastal areas. We use these measurements in the area of formation of North Atlantic Deep Water to estimate that this water mass forms with a228Ra/226Ra activity ratio of 0.10. |
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