Distribution of radium-224 in the western Arctic Ocean
- 海洋环境－已发表论文 
Radium-224 activities in the western Arctic Ocean were measured via ship-board Rn-220 emanation technique during the Second Chinese National Arctic Expedition. The results showed that the Ra-234 activities in the study areas ranged from being less than 0.08 to 3.58 Bq/m(3), with an average of 0.23 Bq/m(3). The low Ra-224 concentration in the surface water was attributed to the influence of sea ice melted water. The horizontal distribution of surface Ra-224 in the western Arctic Ocean showed a high Ra-224 characteristics occurred along the slope around 160 degrees W, providing evidence for the importance of ice-rafted sediments to controlling the distribution of radium isotopes in the Arctic Ocean. Mostly, Ra-234 concentrations increased with the depth in the shelf region and reached a maximum at 75 in at the central Canada Basin, which further confirms the importance of the transport of shelf bottom water to maintaining the upper halocline layer in the Canada Basin.