Structure and evolution of interannual variability of the tropical Pacific upper ocean temperature

IOCAS-IR > 海洋环流与波动重点实验室

	Structure and evolution of interannual variability of the tropical Pacific upper ocean temperature
	Zhang Ronghua; Levitus Sydney
	1996-09-15
发表期刊	JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
卷号	101 期号:C9 页码:20501-20524
摘要	Yearly in situ temperature anomaly data for the period 1961-1990 are analyzed to reveal the dominant structure and evolution of interannual variability of the tropical Pacific upper ocean. We use multivariate empirical orthogonal function (EOF) analyses to detect the principal three-dimensional structure related to El Nino. There are well-defined subsurface thermal patterns, characterized by a prominent sea-saw structure with opposite anomaly polarity in the equatorial and off-equatorial tropical North Pacific regions. During an El Nino year a positive temperature anomaly is found in the-e-astern and central tropical upper ocean. This is accompanied by a corresponding negative anomaly at subsurface depths in the west, with a maximum at 100-150 m off the equator. Unlike sea surface temperature, whose variations are confined largely to the east with one dominant polarity, temperature variations at 50-200 m depths have a dipole pattern with out-of-phase oscillations in the central equatorial Pacific and in the western tropical North Pacific. A reverse pattern of these anomalies is observed during a La Nina year. Evolution between El Nino and La Nina involves a significant zonal transfer of anomaly phase across the equatorial basin as well as across the off-equatorial tropical North Pacific, showing consistent and coherent variations from west to east, from subsurface to sea surface, and from on the equator to off the equator. This phase propagation is more evident at subsurface depths than that at the sea surface, suggesting a continual movement of anomaly pattern in succession, eastward along the equator and westward off the equator of the tropical North Pacific, with spatial inhomogeneities of zonal propagation in longitude. Our analyses present evidence of the manner in which temperature anomalies evolve at subsurface ocean depths in the tropical Pacific, thus providing an observational basis for evaluating theoretical studies and model simulations. The dynamical implication of these results is also discussed.
关键词	Sea-surface Temperature General-circulation Model Heat-content Variability El-nino Cycles Southern-oscillation Rossby Waves Equatorial Pacific Atmosphere Interaction Coupled Gcm Enso
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/18158
专题	海洋环流与波动重点实验室
推荐引用方式 GB/T 7714	Zhang Ronghua,Levitus Sydney. Structure and evolution of interannual variability of the tropical Pacific upper ocean temperature[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,1996,101(C9):20501-20524.
APA	Zhang Ronghua,&Levitus Sydney.(1996).Structure and evolution of interannual variability of the tropical Pacific upper ocean temperature.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,101(C9),20501-20524.
MLA	Zhang Ronghua,et al."Structure and evolution of interannual variability of the tropical Pacific upper ocean temperature".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 101.C9(1996):20501-20524.

条目包含的文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
Structure and evolut（2139KB）			限制开放	CC BY-NC-SA	浏览