白令海峡水团来源的镭同位素示踪

陈敏; 李艳平; 邱雨生; 杨俊鸿

白令海峡水团来源的镭同位素示踪

1.
厦门大学海洋学系,福建厦门 361005;厦门大学近海海洋环境科学国家重点实验室,福建厦门 361005
2.
厦门大学海洋学系,福建厦门 361005

基金项目: 国际极地年中国行动计划项目;中国第3次北极科学考察资助项目;福建省自然科学基金杰出青年基金项目(2009J06026)。

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出版历程
- 收稿日期: 2010-08-12

Water masses in the Bering Strait revealed by radium isotopes

1.
Department of Oceanography, Xiamen University, Xiamen 361005, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
2.
Department of Oceanography, Xiamen University, Xiamen 361005, China

摘要

摘要: 对白令海峡64.3°N纬向断面镭同位素的研究表明,水体中²²⁶Ra比活度、²²⁸Ra比活度和²²⁸Ra/²²⁶Ra)_A.R.存在明显的纬向变化,反映出太平洋与北冰洋水体交换的多种路径。根据温度、盐度和镭同位素的水平与垂直分布,太平洋水进入北冰洋的路径可能主要有3支,分别为白令海峡西侧的阿拉德水、白令海峡东侧的阿拉斯加沿岸水和中部的白令海陆架水。2003年7月和9月对该断面西侧站位进行的复测显示,水体中的²²⁶Ra比活度、²²⁸Ra比活度和²²⁸Ra/²²⁶Ra)_A.R.发生了明显变化,9月份测值均高于7月份测值,说明白令海峡西部水体在9月份可能受到西伯利亚沿岸流南向混合的影响。
- 白令海峡 /
- 水团来源 /
- 镭-226 /
- 镭-228
Abstract: Radium isotopes in the water column along 64.3°N in the Bering Strait were determined to reveal the northward flow of the Pacific water. The specific activities of ²²⁶Ra and ²²⁸Ra, and the ²²⁸Ra/²²⁶Ra)_A.R. show a longitudinal variation in the Bering Strait, depicting the pathways of Pacific inflow. Based on the distributions of temperature, salinity and radium isotopes in the Bering Strait, three water masses were identified: the Anadyr Water in the western channel, the Alaskan Coastal Water in the eastern channel, and the Bering Shelf Water in the central strait. A subseasonal variation of radium isotopes in the Bering Strait was observed.The specific activities of ²²⁶Ra and ²²⁸Ra, and ²²⁸Ra/²²⁶Ra)_A.R. in September are higher than those observed in July, indicating water in the western Bering Strait is influenced by the southward flow of the Siberia Coastal Current in September.
- Bering Strait /
- water masses /
- ²²⁶Ra /
- ²²⁸Ra

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参考文献(30)

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