| Yang Yongliang,Masashi Kusakabe,Yoshiyuki Yamamoto. 2002. Behaviors of 210Pb and 210Po around hydrothermal vents in the Okinawa Trough. Acta Oceanologica Sinica, (1):95－114 |
| Behaviors of 210Pb and 210Po around hydrothermal vents in the Okinawa Trough |
| Behaviors of 210Pb and 210Po around hydrothermal vents in the Okinawa Trough |
| Received:August 27, 2001 Revised:November 10, 2001 |
| DOI： |
| Key words:Okinawa Trough hydrothermal vent 210Pb 210Po |
| 中文关键词: Okinawa Trough hydrothermal vent 210Pb 210Po |
| 基金项目: |
| Author Name | Affiliation | | Yang Yongliang | Department of Environmental Science, Qingdao University, Qingdao 266071, China | | Masashi Kusakabe | Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka 237-0061, Kanagawa, Japan | | Yoshiyuki Yamamoto | Sewage Water Buteau, City of Yokohama, 2-6-1 Motomiya, Tsurumi-ku, Yokohama 230-0004, Japan |
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| Abstract: |
| Vertical profiles for the uranium-series radioisotopes 210Pb and 210Po were obtained at the two hydrothermal vent sites,the Iheya Ridge and the Minami-Ensei Knoll,in the Mid-Okinawa Trough in 1993 and 1994,respectively.In 1995,both radioisotopes were measured at the Minami-Ensei Knoll again.At the Iheya Ridge,where the hydrothermal activity is not active as reflected by the CH4,and 222Rn data,both the total 210Pb and 210Po activities show deficiency relative to their parents,and the mean residence time of 210Pb and 210Po is approximately equal to 20 and 2-5 a,respectively.At the Minami-Ensei Knoll,which is characterized by black smokers,the total 210Pb(0.167×10-3-2.5×10-3 Bq/kg) around the plumes is deficient relative to 226Ra but the total 210Po activities (1.83×10 -3-2.83×10-3 Bq/kg) are in excess relative to 210Pb.The 210Po activities are higher than those in the East China Sea and the Okinawa Trough and excess 210Po has been found.The 210Pb/226Ra and 210Po/210Pb activity ratios are 0.1-0.4 and 1.1-7.8,respectively.210Pb is preferentially scavend in the hydrothemial plumes.The possible mechanisms governing the concentration of 210Pb in the Minami-Ensei Knoll involve a lateral transport of 210Pb via diffusion.The high 210Po/210Pb activity ratios in the hydrothermal plumes suggest a depletion of 210Pb and addition of 210Po in the hydrothermal vent area. |
| 中文摘要: |
| Vertical profiles for the uranium-series radioisotopes 210Pb and 210Po were obtained at the two hydrothermal vent sites,the Iheya Ridge and the Minami-Ensei Knoll,in the Mid-Okinawa Trough in 1993 and 1994,respectively.In 1995,both radioisotopes were measured at the Minami-Ensei Knoll again.At the Iheya Ridge,where the hydrothermal activity is not active as reflected by the CH4,and 222Rn data,both the total 210Pb and 210Po activities show deficiency relative to their parents,and the mean residence time of 210Pb and 210Po is approximately equal to 20 and 2-5 a,respectively.At the Minami-Ensei Knoll,which is characterized by black smokers,the total 210Pb(0.167×10-3-2.5×10-3 Bq/kg) around the plumes is deficient relative to 226Ra but the total 210Po activities (1.83×10 -3-2.83×10-3 Bq/kg) are in excess relative to 210Pb.The 210Po activities are higher than those in the East China Sea and the Okinawa Trough and excess 210Po has been found.The 210Pb/226Ra and 210Po/210Pb activity ratios are 0.1-0.4 and 1.1-7.8,respectively.210Pb is preferentially scavend in the hydrothemial plumes.The possible mechanisms governing the concentration of 210Pb in the Minami-Ensei Knoll involve a lateral transport of 210Pb via diffusion.The high 210Po/210Pb activity ratios in the hydrothermal plumes suggest a depletion of 210Pb and addition of 210Po in the hydrothermal vent area. |
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