白令海峡夏季流量的年际变化及其成因

张洋; 苏洁

白令海峡夏季流量的年际变化及其成因

张洋,
苏洁

中国海洋大学教育部物理海洋重点实验室, 山东青岛 266100

基金项目: 国家自然科学面上基金(40876003);教育部留学回国人员科研启动基金(20091001)。

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出版历程
- 收稿日期: 2011-11-09
- 修回日期: 2012-02-20

The inter-annual variability in the volume transport through Bering Strait and its related factors

ZHANG Yang,
SU Jie

Key Lab of Physical Oceanography, Ocean University of China, Qingdao 266100, China

摘要

摘要: 白令海峡是连接太平洋和北冰洋的唯一通道,穿过海峡的海水体积通量在年际尺度上的变化主要取决于海峡南北两侧的海面高度差,白令海峡的入流对北冰洋海洋过程有重要的意义。利用SODA资料计算夏季白令海峡海水体积通量,对其年际变化及成因进行分析。结果表明夏季白令海峡的体积通量主要是正压地转的;当体积通量为正距平时,楚科奇海、东西伯利亚海、拉普捷夫海以及波弗特海南部海面高度为负距平,同时,白令海陆架海面高度为正距平;对这些海域的Ekman运动、上层海洋温度、盐度和垂直流速进行分析,发现海面高度异常与海峡体积通量的这种关系主要是与海面气压异常分布所产生的Ekman运动有关。当白令海峡的体积通量为正距平时,北冰洋中央海面气压为正距平,白令海海盆海面气压为负距平。这种气压的异常分布在一定程度上解释了上层海洋运动、海水温盐结构与白令海峡入流的关系,从而把夏季大尺度大气环流和白令海峡体积通量的年际变化联系了起来。
- 白令海峡 /
- 体积通量 /
- 年际变化 /
- Ekman输运
Abstract: Bering Strait is the only channel connecting the Pacific Ocean and the Arctic Ocean.The Pacific water through the strait is mainly driven by the meridional sea level slop and its inter-annual variation has great influence on the Arctic Ocean. In this study SODA data is applied to the calculation of the monthly mean volume transport through Bering Strait. The factors related to the inter-annual variability of summer volume transport are discussed.The results show that the SSH in the Laptev Sea, the East Siberian Sea, the Chukchi Sea, south of the Beaufort Sea is negatively correlated to the volume transport of Bering Strait in inter-annual scale while the situation is opposite in the eastern shelf of Bering Sea.After analyzing the correlation of the volume flux with the Ekman transport, pumping rate, upper layer salinity, temperature and density, the paper find that the Ekman transport anomaly should be responsible for the relationship between the sea surface height and the volume flux of Bering Strait. When the SLP is positive anomaly over central part of the Arctic Ocean and negative anomaly over Bering Sea basin, the volume transport through Bering Strait will be enlarged. Such SLP anomaly would explain the relationship between the Bering Strait volume transport and the Ekman transport, pumping rate and upper layer water properties to some extend. The paper reveals that the summer SLP’s inter-annual variation can change SSH via Ekman transport and finally dominant the volume transport through Bering Strait.
- Bering Strait /
- volume transport /
- inter-annual variation /
- Ekman transport

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参考文献(16)

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