地球科学进展 ›› 1999, Vol. 14 ›› Issue (4): 365 -370. doi: 10.11867/j.issn.1001-8166.1999.04.0365

综述与评述 上一篇    下一篇

234Th/ 238U 不平衡法在真光层颗粒动力学研究中的应用
陈 敏,黄奕普   
  1. 厦门大学海洋系,福建 厦门 361005
  • 收稿日期:1998-11-20 修回日期:1999-01-22 出版日期:1999-08-01
  • 通讯作者: 陈敏,男,1970年4月出生,副教授,主要从事同位素海洋学的研究工作。
  • 基金资助:

    国家自然科学基金资助项目“真光层的颗粒动力学”(项目编号:49376272)、“海洋胶体动力学”(项目编号: 49706069)和国家“九五”科技攻关项目“南沙海区真光层的颗粒动力学与新生产力的研究”(项目编号: 95-926-04-02)资助。

PARTICLE DYNAMICS IN EUPHOTIC ZONE ELUCIDATED FROM 234TH/ 238U DISEQUILIBRIA:A REVIEW

CHEN Min, HUANG Yipu   

  1. Department of Oceanography,Xiamen University,Xiamen 361005,China
  • Received:1998-11-20 Revised:1999-01-22 Online:1999-08-01 Published:1999-08-01

真光层是海洋浮游生物活动最为活跃的区域,其间发生的颗粒动力学过程及其机制对于海洋碳的生物地球化学循环有着重要影响,利用放射性核素示踪海洋真光层颗粒动力学过程成为近年来海洋科学的前沿课题。介绍了该领域234Th-238U不平衡法的原理、发展历程及其在POC输出通量的估算、沉积物捕集器捕集效率的校正、真光层层化结构的揭示、颗粒活性元素固/液界面分配机制的研究、海洋胶体性质的研究及近岸海域悬浮颗粒活性污染物归宿的预测等方面的应用,并对我国在该领域的研究进展进行了总结。

Euphotic zone is the most active region for marine organism activities. The particle dynamic processes and their regulation in euphotic zone have great effect on marine biogeochemical cycle of carbon.The study of particle dynamics by radionuclides had become a popular program in international marine science studies. In this paper, we described the principle and development of particle dynamics in euphotic zone via 234Th-238U disequilibria. This parent-daughter pair tracer can be applied to many aspects of oceanography, such as the estimation of POC export flux, the calibration of the capture efficiency of sediment trap, the elucidation of the stratified structure, the particle/solution distribution of particle-reactive elements, the study of marine colloids and the prediction of the fate of pollutants in coastal ecosystems. In
addition, we summarized the research progress of the particle dynamics in our country. In the future research, we should expand the application of 234Th/238U disequilibria in marine research, especially in the study of marine colloids dynamics and organic pollutants. On the other hand, more applied research needs
for a better understanding of the biogeochemistry of marine particles, especially by using new tracers or multi-tracer approaches, such as 210Po/210Pb disequilibria,228Th/228Ra disequilibria and some biomarkers.

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