Radium-226 and Radon-222: Concentration in Atlantic and Pacific Oceans

American Association for the Advancement of Science (AAAS) - Tập 158 Số 3806 - Trang 1307-1310 - 1967
Wallace S. Broecker1, Yuan Hui Li1, John Cromwell1
1Lamont Geological Observatory, Columbia University, Palisades, New York

Tóm tắt

Measurements of radon-222 in seawater suggest the following. The radium-226 content of surface water in both the Atlantic and Pacific oceans is uniformly close to about 4 × 10 -14 gram per liter. The deep Pacific has a concentration of radium-226 that is four times higher and the deep Atlantic a concentration twice as high as that of the surface. These distribution profiles can be explained by the same particle-settling rate for radium-226 from surface to depth for the two oceans and by a threefold longer residence time of water in the deep Pacific than in the deep Atlantic. The vertical distribution of the deficiency of radon-222 in the surface water of the northwest Pacific Ocean suggests a coefficient of vertical eddy diffusion as high as 120 square centimeters per second and a gas-exchange rate for carbon dioxide in surface water between 14 and 60 moles per square meter per year. Vertical profiles of the excess of radon-222 in near-bottom water of the South Atlantic give coefficients of vertical eddy diffusion ranging from 1.5 to more than 50 square centimeters per second.

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Tài liệu tham khảo

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American Association for the Advancement of Science (AAAS)

Tập 158 Số 3806

1307-1310

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