冲绳海槽海底热液喷出口附近海水中<sup>210</sup>Pb和<sup>210</sup>Po的行为

杨永亮; 日下部正志; 山本惠幸

冲绳海槽海底热液喷出口附近海水中²¹⁰Pb和²¹⁰Po的行为

1.
青岛大学, 环境科学系, 山东, 青岛, 266071
2.
日本海洋科学技术中心, 横须贺, 237-0061
3.
日本横滨市, 污水处理局, 横滨, 230-0004

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出版历程
- 收稿日期: 2001-03-07
- 修回日期: 2001-08-27

²¹⁰Pb and²¹⁰Po in sea water around the hydrothermal vents in the Okinawa Trough

1.
Department of Environmental Science, Qingdao University, Qingdao 266071, China
2.
Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan
3.
Sewage Water Bureau, City of Yokohama, Yokohama 230-0004, Japan

摘要

摘要: 讨论了在冲绳海槽伊平屋海岭和南奄西海丘两处海底热液喷出口附近海水中的铀系子体放射性核素²¹⁰Pb和²¹⁰Po浓度的垂直分布剖面.在伊平屋海岭,甲烷及²²²Rn的数据表明海底热液活动不强,总²¹⁰Pb和²¹⁰Po放射性均低于它们各自母体的放射性,²¹⁰Pb和²¹⁰Po在海水中的平均停留时间分别为20和2～5a,而在以“黑色烟雾”为特征的海底热液活动强烈的南奄西海丘,在”烟雾”中的总²¹⁰Pb含量(0.167×10^-3～2.50×10^-3Bq/kg)相对其母体²²⁶Ra贫乏,而总²¹⁰Po含量(1.83×10^-3～2.83×10^-3Bq/kg)则相对其母体²¹⁰Pb过剩.该处海水中的²¹⁰Po的放射性高于东海陆架区及冲绳海槽其他海区,并且显示了²¹⁰Po过剩.²¹⁰Pb/²²⁶Ra以及²¹⁰Po/²¹⁰Pb放射性比值的范围分别为0.1～0.4和1.1～7.8.在热液扩散带中²¹⁰Pb被优先从海水中清除.控制南奄西海丘海水中²¹⁰Pb浓度的可能机制涉及到²¹⁰Pb通过扩散作用的横向输送.在热液扩散带中高²¹⁰Po/²¹⁰Pb放射性比值表明²¹⁰Pb的耗尽及²¹⁰Po从海底热液喷出口的加入.
- 冲绳海槽 /
- 海底热液 /
- ²¹⁰Pb /
- ²¹⁰Po
Abstract: Vertical profiles for the uranium-series radioisotopes ²¹⁰Pb and ²¹⁰Po were obtained at the two hydro thermal ventsites,the Iheya Ridge and the Minami-Ensei Knoll,in the Mid-Okinawa Trough in 1993 and 1994,respectively.At the Ihey a Ridge,where the hydrothermal activity is not active as reflected by the CH₄ and ²²²Rn data,both the total ²¹⁰Pb and ²¹⁰Po activities show deficient relative to their parents,and the mean residence time of ²¹⁰Pb and ²¹⁰Po is about 20 and 2~5 a,respectively.At the Minami-Ensei Knoll,which is characterized byblack smokers,the total ²¹⁰Pb activity(0.167×10^-3～2.50×10^-3Bq/kg) around the plumes is deficient relative to ²²⁶Ra but the total ²¹⁰Po activity(1.83×10^-3～2.83×10^-3Bq/kg) is 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 beenfound.The ²¹⁰Pb/²²⁶Ra and²¹⁰Po/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 viadiffusion.The high ²¹⁰Po/²¹⁰Pb activity ratios in the hydrother mal plumes suggest a depletion of ²¹⁰Pb and addition of ²¹⁰Po in the hydrothermal vent area.
- Okinawa Trough /
- hydrothermal vent /
- ²¹⁰Pb /
- ²¹⁰Po

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