| 摘要: |
| 南沙暖水域位于南海南部,濒临赤道,处于Walker环流上升区和南北半球气流交换的通道上,是南海海温较高的区域,也是海气相互作用的敏感地区。热带海域海洋及大气环流的变化对该海域海温的变化有着重要影响。
以往的研究表明,南海海温与赤道中、东太平洋水温和西太平洋副热带高压关系密切(钮智旺,1994;陈永利,1996)。南海是一个半封闭性海域,南海海温的变化与热带西太平洋水温之间具有非“承接”性(周发琇,1991),与西太平洋之间的水体交换不可能是引起南海海温变化的主要原因。那么,赤道中、东太平洋海温及副高是通过什么过程影响南海海温呢?它们之间的相互关系如何?西太平洋副热带高压是控制南海海域的主要天气系统，厄尔尼诺和南方涛动是热带太平洋地区海洋、大气中的两种大尺度异常现象,南海海温与它们之间的耦合关系可能就是影响海温变化的过程。本文根据综合海洋大气资料(COADS),分析了南沙暖水的变化与南海海温的关系,并借助功率谱和交叉谱分析了南沙暖水的变化周期以及与赤道东、中太平洋水温、南方涛动和西太副高之间的显著耦合频域及相互耦合振荡关系,以探讨南沙暖水与ENSO(埃尔尼诺-南方涛动)和西太副高之间的内在联系及海温变化的原因,对于研究南沙暖水域及南海海温变化的物理成因有着重要意义。 |
| 关键词: 南沙暖水、西太副高、ENSO |
| DOI： |
| 分类号: |
| 基金项目:中国科学院海洋研究所调查研究报告第2895号
“八五”国家科技攻关资助项目，85-927-05号 |
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| ON THE COUPLING OSCILLATION BETWEEN THE NANSHA WARM WATER, THE WESTERN PACIFIC SUBTROPICAL HIGH AND ENSO |
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Chen Yongli1, Zhang Qingrong2, Zhao Yongping1
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1.Institute of Oceanology,Chinese Academy of Sciences;2.Institute of Nanhai Oceanology,Chinese Academy of Sciences
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| Abstract: |
| Cross-spectrum revealed the coupling relationships between the Nansha sea surface temperature (SST), the Central and Eastern Equatorial Pacific SST, Southern Oscillation (the difference between the standardized sea level pressure at Darwin and Tahiti)and the Western Pacific Subtropical High. The results showed that there are apparent coupling periods of 2,5 and 23.3-46.5 months among them, and the inphase low-frequency coupling oscillation of 2-3.8 years period is predominant and associated with the ENSO events. The physical processes affecting the Nansha SST are discussed. During the ENSO events, the Central and Eastern Equatorial Pacific SST increase, then the Western Subtropical High develops and extends westward. The cloudiness over the Nansha area decreases, the Nansha SST increases, and vice versa. The variations of cludiness over the Nanhai (weak ocean current area) play an important role in influencing the Nansha SST under the control of the Western Subtropcal High. |
| Key words: NANSHA WARM WATER,WESTERN PACIFIC SUBTROPICAL HIGH,ENSO |
