| Behaviors of 210Pb and 210Po around hydrothermal vents in the Okinawa Trough |
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| 作者姓名： | Yang Yongliang Masashi Kusakabe Yoshiyuki Yamamoto |
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| 作者单位： | Yang Yongliang，Masashi Kusakabe，Yoshiyuki Yamamoto1. Department of Environmental Science，Qingdao University，Qingdao 266071，China2. Japan Marine Science and Technology Center，2 - 15 Natsushima-cho，Yokosuka 237 - 0061，Kanagawa，Japan3. Sewage Water |
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| 摘 要： | Vertical profiles for the uranium-series radioisotopes 210Pb and 210Po were obtained at thetwo 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 a-gain. At the Iheya Ridge, where the hydrothermal activity is not active as reflected by the CH_4, 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/
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| 关 键 词： | Okinawa Trough hydrothermal vent 210Pb 210Po |
| 收稿时间： | 2001/8/27 0:00:00 |
| 修稿时间： | 2001/11/10 0:00:00 |
Behaviors of 210Pb and 210Po around hydrothermal vents in the Okinawa Trough |
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| Yang Yongliang,Masashi Kusakabe,Yoshiyuki Yamamoto.Behaviors of 210Pb and 210Po around hydrothermal vents in the Okinawa Trough[J].Acta Oceanologica Sinica,2002,21(1):95-114. |
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| Authors: | Yang Yongliang Masashi Kusakabe and Yoshiyuki Yamamoto |
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| Institution: | 1.Department of Environmental Science, Qingdao University, Qingdao 266071, China2.Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka 237-0061, Kanagawa, Japan3.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 scavenged in the hydrothermal 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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| Keywords: | Okinawa Trough hydrothermal vent 210Pb 210Po |
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