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本文使用谱分析法,分析了ENSO与热带西北太平洋海洋上层热含量和副热带高压的多年变化及其相互关系。文中以南方涛动指数(SOI)距平表征ENSO,以海面至100m水层的平均温度(Tav)代表上层热含量,以Tav>27℃网格数(HC)的季距平代表热含量的变化,以西太平洋副热带高压的面积指数(ST)表示其多年变化。分析结果表明,这三个时间序列的持续性良好,它们有相似的自振韵律和一个共同的谱峰,主要振荡周期均为3～4a。交叉谱分析表明,在这一振荡周期上,这些时间序列有较高的凝聚,且SOI和HC同相,而HC和ST反相变化,即SOI为负距平时,HC也为负距平,而ST为正距平,SOI先于HC两个月,而HC先于ST6个月左右。
In this paper, the spectral analysis is used to analyze the multi-year changes of ENSO and the upper ocean heat content and the subtropical high in the tropical Northwest Pacific and their correlation. In this paper, the ENSO is represented by the Southern Oscillation Index (SOI) anomaly, the upper layer heat content is represented by the average temperature (Tav) from the sea surface to 100m water layer, and the thermal exponent Change, the area index of the western Pacific subtropical high (ST) that years of change. The analysis results show that these three time series have good continuity, they have similar self-resonance rhythm and a common spectrum peak, and the main oscillation periods are all 3 ~ 4a. Cross-spectrum analysis shows that during these oscillation periods, these time series have higher agglomeration, and SOI is in phase with HC, while HC and ST are in reverse phase, that is, HC is also negative anomaly when SOI is negative anomaly ST is positive anomaly, SOI before HC two months, while HC before ST6 months.