| 赤道太平洋区域风应力与海表温度年际异常的奇异值分解 |
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| 引用本文： | 王盘兴,周伟灿,薛志华,王欣.赤道太平洋区域风应力与海表温度年际异常的奇异值分解[J].应用气象学报,1998,9(3):265-272. |
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| 作者姓名： | 王盘兴 周伟灿 薛志华 王欣 |
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| 作者单位： | 1.南京气象学院 |
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| 摘 要： | 用向量场奇异值分解方法分析了赤道太平洋区域风应力场与海表温度场年际异常的相关联系。结果表明，最主要的一对奇异向量与ENSO循环关系密切，其主要特征为赤道中、东太平洋风应力向赤道的异常辐合（辐散）与该区的SST异常升高（降低）准同步变化。对70和80年代的4次 El Ni?o事件中标准化风应力异常场的分析表明，它们均表现出赤道中、东太平洋的辐合。这一结果可能比用信风张弛描述ENSO循环中的环流异常更合理和更具代表性。
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| 关 键 词： | 赤道太平洋区域 奇异值分解 ENSO循环 风应力异常 |
Singular Value Decomposition of Interannual Anomalies of Wind Stress and Sea Surface Temperature in the Equatorial Pacific Area |
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| Affiliation: | (Nanjing Institute of Meteorology, Nanjing 210044) |
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| Abstract: | The relationship between interannual anomalies of wind stress and sea surface temperature (SST) in the equatorial Pacific area is analyzed using a singular value decomposition (SVD) scheme. The results show that the major pair of singular vectors is closely related with ENSO cycles and its main feature is the quasi-synchronous variations of the anomalous convergence (divergence) towards the equator of wind stress with the anomalous increase (decrease) of SST over the equatorial eastern and middle Pacific. The analyses of anomaly fields of the normalized wind stress during four E1 Nino events in the seventies and eighties show that there was the convergence of wind stresses over the equatorial eastern and middle Pacific in all four events. The results show that the singular value decomposition scheme of vector may be more reasonable and representative than trade relaxation in describing the circulation anomaly in ENSO cycles |
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| Keywords: | Equatorial Pacific area Singular value decomposition ENSO cycle Wind stress anomaly |
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