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Seasonal cycle of topography in the Bohai Sea and Yellow Sea and its relationships with atmospheric forcing and oceanic adjustment based on altimetry data

机译:基于测高资料的渤海和黄海地形季节性周期及其与大气强迫和海洋调整的关系

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摘要

Seasonal cycle is the most significant signals of topography and circulation in the Bohai Sea (BS)and Yellow Sea (YS) forced by prevailing monsoon and is still poorly understood due to lack of data in their interiors. In the present study, seasonal cycles of topography in the BS and YS and its relationship with atmospheric forcing and oceanic adjustment were examined and discussed using TOPEX/Poseidon and ERS-1/2 Sea Level Anomalies (SLA) data. Analyses revealed complicated seasonal cycles of topography composed mainly of2 REOF modes, the winter-summer mode (WIM) and spring-autumn mode (SAM). The WIM with action center in the BS displayed peak and southward pressure gradient in July, and valley and northward pressure gradient in January, which is obviously the direct response to monsoon with about 1-month response time. The SAM with action center in the western south YS displayed peak and northward pressure gradient in October and valley and southward pressure gradient in April. After the mature period of monsoon, the action center in the BS became weakened while that in the western south YS became strengthened because of regional convergence or divergence induced by seasonal variations of the Taiwan Warm Current and Yellow Sea Coastal Current. The direct response of topography to monsoon resulted in the WIM, while oceanic adjustment of topography played an important role in the forming of the SAM.
机译:季节性周期是盛行季风强迫的渤海(BS)和黄海(YS)地形和环流最重要的信号,由于内部缺乏数据,人们对其了解仍然很少。在本研究中,使用TOPEX / Poseidon和ERS-1 / 2海平面异常(SLA)数据对BS和YS地形的季节性周期及其与大气强迫和海洋调整的关系进行了检查和讨论。分析表明,地形复杂的季节周期主要由2种REOF模式构成,即冬夏模式(WIM)和春秋季模式(SAM)。 BS行动中心的WIM在7月显示出峰值和向南的压力梯度,在1月显示出谷地和向北的压力梯度,这显然是对季风的直接响应,响应时间约为1个月。在南YS西部具有行动中心的SAM在10月显示峰值和北向压力梯度,在4月显示谷值和向南压力梯度。在季风成熟期之后,由于台湾暖流和黄海沿岸流的季节性变化引起的区域趋同或发散,南太平洋的行动中心减弱,而南亚西部的行动中心增强。地形对季风的直接响应导致了WIM,而地形的海洋调整在SAM的形成中起着重要作用。

著录项

  • 来源
    《中国海洋湖沼学报(英文版)》 |2004年第3期|256-264|共9页
  • 作者单位

    Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

    Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

    The Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;

    Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

    Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;

    The Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类
  • 关键词

    topography; seasonal cycle; sea level anomalies; the Bohai Sea; the Yellow Sea; response; adjustment;

    机译:地形;季节周期;海平面异常;渤海;黄海;响应;调整;
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