Decadal‐scale variability of upper ocean heat content in the tropical Pacific
Decadal‐scale variability of upper ocean heat content in the tropical Pacific
复制标题
热带太平洋上层海洋热含量的年代际变化
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
K. Hanawa
中科院分区：
文献类型：
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作者：
T. Hasegawa;K. Hanawa
研究了热带太平洋上层海洋热含量（OHC）的年代际变化，并与ENSO尺度进行了比较。近13年的年代际热含量异常在热带北太平洋表现出与ENSO尺度类似的逆时针传播。整个赤道热含量异常比Niño‐3指数异常高出热带太平洋年代际变率约四分之一（约3年）。这个四分之一周期的时滞与ENSO动力学的“补给振荡器”模型的思想是一致的。此外，整个赤道太平洋的主要热含量异常的大小与Niño‐3和Niño‐3.4指数的后续大小呈线性关系。这种关系也与ENSO尺度相似，但两者之间有几个不同点。特别是，与ENSO尺度相比，赤道太平洋中部（Niño‐3.4区域）的振幅大于东部（Niño‐3区域）。
Decadal‐scale variability of upper ocean heat content (OHC) in the tropical Pacific is investigated and is compared with that of ENSO scale. The decadal‐scale OHC anomaly with a period of about 13 years shows anticlockwise propagations in the tropical North Pacific like as that of ENSO scale. It is also shown that the entire equatorial OHC anomaly leads Niño‐3 index anomaly by about a quarter (about 3 years) of the period of the decadal variability in the tropical Pacific. This time lag of a quarter of the period is consistent with the idea of the “recharge oscillator” model for ENSO dynamics. Further it is shown that the magnitude of leading OHC anomalies in the entire equatorial Pacific is linearly related to the subsequent magnitudes of Niño‐3 and Niño‐3.4 indices. This relationship is also similar with that of ENSO scale, but there are several different points between them. Particularly, in contrast with the ENSO scale, the amplitude is larger in central equatorial Pacific (Niño‐3.4 region) than in the eastern region (Niño‐3 region).